S-8520/8521 Series S-8520/8521 Series consists CMOS step-down swi

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S-8520/8521 Series S-8520/8521 Series consists CMOS step-down swi

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Control PWM/PFM Control Step-Down Switching Regulator-Controllers
S-8520/8521 Series
S-8520/8521 Series consists CMOS step-down switching regulatorcontrollers with PWM-control (S-8520) PWM/PFM-switched control (S8521). These devices contain reference voltage source, oscillation circuit, error amplifier, other components. S-8520 Series provides low-ripple power, high-efficiency, excellent transient characteristics thanks control circuit capable varying duty ratio linearly from series also contains error amplifier circuit well soft-start circuit that prevents overshoot startup. S-8521 Series works with either control control, switch from other. normally operates using control with duty ratio under light load, automatically switches control with duty ratio This series ensures high efficiency over wide range conditions, from standby mode operation peripheral equipment.
With addition external Power transistor, coil, capacitors, diode connected externally, these function step-down switching regulators. They serve ideal power supply units portable devices when coupled with SOT-23-5 minipackage, providing such outstanding features current consumption. Since this series accommodate input voltage also ideal when operating adapter.
Features:
Applications:
On-board power supplies battery devices current consumption: portable telephones, electronic notebooks, PDAs, operation: max. Series) like. max. Series) Power supplies audio equipment, including max. Series) portable players headphone stereo When powered off: max. equipment. Input voltage: Fixed voltage power supply cameras, video Series) equipment communications equipment. Series) Power supplies microcomputers. Output voltage: Conversion from four NiCd cells Selectable between lithium-ion cells step Conversion adapter input Duty ratio: control (S-8520) PWM/PFM-switched control (S-8521) only peripheral components that used with this power transistor, coil, diode, capacitors transistor used, base resistance capacitor will also required). Oscillation frequency: typ. Series), typ. Series), typ. Series). Soft-start function: typ. Series) typ.(C Series), typ. Series). With power-off function. With built-in overload protection circuit. Overload detection time: typ. Series), typ. Series) typ.(E Series).
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers S-8520/8521 Series Rev.7.4_10 Block Diagram:
Oscillation Circuit
Reference Voltage Source with Soft Start
VOUT
PWM/PFMSwitched Control Circuit
COUT
Note: diode inside parasitic diode.
Figure Block Diagram
Selection Guide:
Product Name
Tape specifications Product name abbreviation. Package name abbreviation. Output voltage Product type: Oscillation frequency kHz, with overload protection circuit.
Oscillati frequency kHz, without overload protection circuit. Oscillation frequency kHz, with overload protection circuit. Oscillation frequency kHz, without overload protection circuit. Oscillation frequency kHz, with overload protection circuit. Oscillation frequency kHz, without overload protection circuit.
Control system
control PWM/PFM-switched control
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers Rev.7.4_10 S-8520/8521 Series
Product List September 2000) Series (Oscillation Frequency kHz)
Item Output Voltage S-8520AXXMC Series S-8520A21MC-AVG-T2 S-8520A25MC-AVK-T2 S-8520A27MC-AVM-T2 S-8520A28MC-AVN-T2 S-8520A29MC-AVO-T2 S-8520A30MC-AVP-T2 S-8520A31MC-AVQ-T2 S-8520A32MC-AVR-T2 S-8520A33MC-AVS-T2 S-8520A34MC-AVT-T2 S-8520A35MC-AVU-T2 S-8520A36MC-AVV-T2 S-8520A50MC-AWJ-T2 S-8521AXXMC Series S-8521A25MC-AXK-T2 S-8521A27MC-AXM-T2 S-8521A28MC-AXN-T2 S-8521A29MC-AXO-T2 S-8521A30MC-AXP-T2 S-8521A31MC-AXQ-T2 S-8521A32MC-AXR-T2 S-8521A33MC-AXS-T2 S-8521A34MC-AXT-T2 S-8521A35MC-AXU-T2 S-8521A36MC-AXV-T2 S-8521A50MC-AYJ-T2 S-8520BXXMC Series S-8521BXXMC Series
S-8520B18MC-ARD-T2 S-8521B18MC-ATD-T2 S-8521B19MC-ATE-T2 S-8521B20MC-ATF-T2 S-8521B21MC-ATG-T2 S-8520B25MC-ARK-T2 S-8521B25MC-ATK-T2 S-8520B27MC-ARM-T2 S-8521B27MC-ATM-T2 S-8520B28MC-ARN-T2 S-8521B28MC-ATN-T2 S-8520B29MC-ARO-T2 S-8521B29MC-ATO-T2 S-8520B30MC-ARP-T2 S-8521B30MC-ATP-T2 S-8520B31MC-ARQ-T2 S-8521B31MC-ATQ-T2 S-8520B32MC-ARR-T2 S-8521B32MC-ATR-T2 S-8520B33MC-ARS-T2 S-8521B33MC-ATS-T2 S-8520B34MC-ART-T2 S-8521B34MC-ATT-T2 S-8520B35MC-ARU-T2 S-8521B35MC-ATU-T2 S-8520B36MC-ARV-T2 S-8521B36MC-ATV-T2 S-8520B50MC-ASJ-T2 S-8521B50MC-AUJ-T2
Series (Oscillation Frequency kHz)
Item Output Voltage S-8520CXXMC Series S-8520C25MC-BRK-T2 S-8520C27MC-BRM-T2 S-8520C28MC-BRN-T2 S-8520C29MC-BRO-T2 S-8520C30MC-BRP-T2 S-8520C31MC-BRQ-T2 S-8520C32MC-BRR-T2 S-8520C33MC-BRS-T2 S-8520C34MC-BRT-T2 S-8520C35MC-BRU-T2 S-8520C36MC-BRV-T2 S-8520C50MC-BSJ-T2 S-8521CXXMC Series S-8521C16MC-BTB-T2 S-8521C25MC-BTK-T2 S-8521C27MC-BTM-T2 S-8521C28MC-BTN-T2 S-8521C29MC-BTO-T2 S-8521C30MC-BTP-T2 S-8521C31MC-BTQ-T2 S-8521C32MC-BTR-T2 S-8521C33MC-BTS-T2 S-8521C34MC-BTT-T2 S-8521C35MC-BTU-T2 S-8521C36MC-BTV-T2 S-8521C50MC-BUJ-T2 S-8520DXXMC Series S-8520D25MC-BVK-T2 S-8520D27MC-BVM-T2 S-8520D28MC-BVN-T2 S-8520D29MC-BVO-T2 S-8520D30MC-BVP-T2 S-8520D31MC-BVQ-T2 S-8520D32MC-BVR-T2 S-8520D33MC-BVS-T2 S-8520D34MC-BVT-T2 S-8520D35MC-BVU-T2 S-8520D36MC-BVV-T2 S-8520D50MC-BWJ-T2 S-8521DXXMC Series S-8521D16MC-BXB-T2 S-8521D20MC-BXF-T2 S-8521D25MC-BXK-T2 S-8521D27MC-BXM-T2 S-8521D28MC-BXN-T2 S-8521D29MC-BXO-T2 S-8521D30MC-BXP-T2 S-8521D31MC-BXQ-T2 S-8521D32MC-BXR-T2 S-8521D33MC-BXS-T2 S-8521D34MC-BXT-T2 S-8521D35MC-BXU-T2 S-8521D36MC-BXV-T2 S-8521D50MC-BYJ-T2
Series (Oscillation Frequency kHz)
Item Output Voltage S-8520EXXMC Series S-8520E18MC-BJD-T2 S-8520E25MC-BJK-T2 S-8520E30MC-BJP-T2 S-8520E33MC-BJS-T2 S-8520E50MC-BKJ-T2 S-8521EXXMC Series S-8521E15MC-BLA-T2 S-8521E18MC-BLD-T2 S-8521E20MC-BLF-T2 S-8521E30MC-BLP-T2 S-8521E33MC-BLS-T2 S-8521E35MC-BLU-T2 S-8521E50MC-BMJ-T2 S-8520FXXMC Series S-8520F18MC-BND-T2 S-8520F25MC-BNK-T2 S-8520F27MC-BNM-T2 S-8520F30MC-BNP-T2 S-8520F33MC-BNS-T2 S-8520F34MC-BNT-T2 S-8520F50MC-BOJ-T2 S-8521FXXMC Series S-8521F18MC-BPD-T2 S-8521F30MC-BPP-T2 S-8521F33MC-BPS-T2 S-8521F50MC-BQJ-T2
availability product samples listed above, contact Sales Department.
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers S-8520/8521 Series Rev.7.4_10 Assignment:
SOT-23-5 view
Name Power-off
Function
Step-down operation stopped (All circuits deactivated)
ON/OFF Normal operation (Step-down operation) VOUT Output voltage monitoring
Connection external transistor
power supply
Figure
Absolute Maximum Ratings:
unless otherwise specified) Item voltage VOUT voltage ON/OFF voltage voltage current Power dissipation Operating temperature range Storage temperature range Symbol VOUT VON/OFF VEXT IEXT TOPR TSTG Ratings -0.3 VSS+12 VSS+18 -0.3 VSS+12 VSS+18 -0.3 VSS+12 VSS+18 -0.3 VIN+0.3 +125 Unit
VSS+12 S-8520/21A/C/E; VSS+18 S-8520/21B/D/F
Caution absolute maximum ratings rated values exceeding which product could suffer physical damage. These values must therefore exceeded under conditions.
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers Rev.7.4_10 S-8520/8521 Series Electrical Characteristics:
S-8520/21 Series
Parameter Output voltage Input voltage Symbol VOUT(E) Conditions S-8520/21A Series S-8520/21B Series Current consumption Current consumption during power ISS1 ISSS VOUT VOUT(S) VON/OFF S-8520/21X15 S-8520/21X25 IEXTH VEXT =VIN-0.4 S-8520/21X35 S-8520/21X45 output current S-8520/21X55 S-8520/21X15 S-8520/21X25 IEXTL VEXT S-8520/21X35 S-8520/21X45 S-8520/21X55 Line regulation Load regulation Output voltage temperature coefficient Oscillation frequency VOUT1 VOUT2 VOUT fosc VOUT(S) Load current =10µA IOUT(See below) Measure waveform VOUT(S) VOUT(S) Measure waveform under load. Evaluate oscillation Evaluate oscillation stop Duration from time VOUT reduced time obtains VIN.
Min.
unless otherwise specified)
Typ. Max. Units VOUT(S) 10.0 16.0 16.0 V/°C
VOUT(S) VOUT(S) 0.976 -2.3 -3.7 -5.3 -6.7 -8.0 +4.3 +7.0 +9.9 +12.6 +15.0 -0.1 -0.1 -4.5 -7.0 -9.3 -11.3 -13.3 +8.4 +13.2 +17.5 +21.4 +25.1 ±VOUT(S) 5E-5
Measurement Circuit
PWM/PFM-control switch Duty duty ratio Power-Off input voltage Power-Off input leakage current Soft-Start time TPRO Overload detection time Efficiency EFFI
Conditions: recommended components connected unless otherwise indicated. VOUT(S) [V], IOUT [mA] (VIN= VOUT(S) Peripheral components: Coil Sumida Electric Co., Ltd. CD54 µH). Diode Matsushita Electronics Corporation MA720 (Schottky type). Capacitor Matsushita Electronics Corporation tantalum type). Transistor Toshiba Corporation 2SA1213Y. Base resistance (Rb) 0.68 Base capacitor (Cb) 2200 (Ceramic type) power-off connected VIN. Notes: output voltage indicated above represents typical output voltage These specifications apply common both S-8520 S-8521, unless otherwise noted. VOUT(S) Specified output voltage value. VOUT(E) Actual output voltage value. Applicable S-8521A Series S-8521B Series. Applicable S-8520A Series S-8521A Series. 2.94 VOUT(S)
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers S-8520/8521 Series S-8520/21 Series
Parameter Output voltage Input voltage Symbol VOUT(E) Conditions S-8520/21C Series S-8520/21D Series Current consumption Current consumption during power-off ISS1 ISSS VOUT VOUT(S) VON/OFF S-8520/21X15 S-8520/21X25 IEXTH VEXT VIN-0.4 S-8520/21X35 S-8520/21X45 output current S-8520/21X55 S-8520/21X15 S-8520/21X25 IEXTL VEXT S-8520/21X35 S-8520/21X45 S-8520/21X55 Line regulation Load regulation Output voltage temperature coefficient Oscillation frequency VOUT1 VOUT(S) VOUT2 Load current IOUT(See below) VOUT fosc Measure waveform VOUT(S) VOUT(S) Duty TPRO EFFI Measure waveform under load. Evaluate oscillation Evaluate oscillation stop Duration from time VOUT reduced time obtains VIN.
Min. VOUT(S) 0.976 -2.3 -3.7 -5.3 -6.7 -8.0 +4.3 +7.0 +9.9 +12.6 +15.0 -0.1 -0.1
unless otherwise specified)
Typ. Max. Units VOUT(S) -4.5 -7.0 -9.3 -11.3 -13.3 +8.4 +13.2 +17.5 +21.4 +25.1 VOUT(S) 5E-5 12.0 14.0 VOUT(S) 1.024 10.0 16.0 24.0 28.0 V/°C Measuremen Circuit
PWM/PFM-control switch duty ratio Power-Off input voltage Power-Off input leakage current Soft-Start time Overload detection time Efficiency
Conditions: recommended components connected unless otherwise indicated. VOUT [V], IOUT [mA] (VIN= VOUT(S) Peripheral components: Coil Sumida Electric Co., Ltd. CD54 µH). Diode Matsushita Electronics Corporation MA720 (Schottky type). Capacitor Matsushita Electronics Corporation tantalum type). Transistor Toshiba Corporation 2SA1213Y. Base resistance (Rb) 0.68 Base capacitor (Cb) 2200 (Ceramic type) power-off connected VIN. Notes: output voltage indicated above represents typical output voltage These specifications apply common both S-8520 S-8521, unless otherwise noted. VOUT(S) Specified output voltage value. VOUT(E) Actual output voltage value. Applicable S-8521C Series S-8521D Series. Applicable S-8520C Series S-8521C Series. 2.94 VOUT(S)
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers Rev.7.4_10 S-8520/8521 Series
S-8520/21 Series
Parameter Output voltage Input voltage Symbol VOUT(E) Conditions S-8520/21E Series S-8520/21F Series Current consumption Current consumption during power-off ISS1 ISSS VOUT VOUT(S) VON/OFF S-8520/21X15 S-8520/21X25 IEXTH VEXT VIN-0.4 S-8520/21X35 S-8520/21X45 output current S-8520/21X55 S-8520/21X15 S-8520/21X25 IEXTL VEXT S-8520/21X35 S-8520/21X45 S-8520/21X55 Line regulation Load regulation Output voltage temperature coefficient Oscillation frequency VOUT1 VOUT(S) VOUT2 Load current IOUT(See below) VOUT fosc Measure waveform VOUT VOUT Measure waveform under load. Evaluate oscillation Evaluate oscillation stop Duration from time VOUT reduced time obtains VIN.
Min.
unless otherwise specified)
Typ. Max. Units Measurement Circuit
VOUT(S) VOUT(S) VOUT(S) 1.024 10.0 -2.3 -3.7 -5.3 -6.7 -8.0 +4.3 +7.0 +9.9 +12.6 +15.0 -0.1 -0.1 -4.5 -7.0 -9.3 -11.3 -13.3 +8.4 +13.2 +17.5 +21.4 +25.1 VOUT 5E-5 16.0
V/°C
PWM/PFM-control switch Duty duty ratio Power-Off input voltage Power-Off input leakage current Soft-Start time TPRO Overload detection time Efficiency EFFI
Conditions: recommended components connected unless otherwise indicated. VOUT [V], IOUT [mA] (VIN= VOUT(S) Peripheral components: Coil Sumida Electric Co., Ltd. CD54 µH). Diode Matsushita Electronics Corporation MA720 (Schottky type). Capacitor Matsushita Electronics Corporation tantalum type). Transistor Toshiba Corporation 2SA1213Y. Base resistance (Rb) 0.68 Base capacitor (Cb) 2200 (Ceramic type) power-off connected VIN. Notes: output voltage indicated above represents typical output voltage These specifications apply common both S-8520 S-8521, unless otherwise noted. VOUT(S) Specified output voltage value. VOUT(E) Actual output voltage value. Applicable S-8521E Series S-8521F Series. Applicable S-8520E Series S-8521E Series. 2.94 VOUT(S)
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers S-8520/8521 Series Rev.7.4_10 Measurement Circuits:
open VOUT open
Oscillation
VOUT
ON/OFF
ON/OFF
0.68
2200 VOUT
ON/OFF
Figure
Operation:
Step-Down DC-DC Converter Control (S-8520 Series) S-8520 Series consists DC/DC converters that employ pulse-width modulation (PWM) system. This series characterized current consumption. conventional system DC/DC converters, pulses skipped when they operated with output load current, causing variations ripple frequency output voltage increase ripple voltage. Both these effects constitute inherent drawbacks those converters. converters S-8520 Series, pulse width varies range from according load current, ripple voltage produced switching easily removed through filter because switching frequency remains constant. Therefore, these converters provide low-ripple power over broad ranges input voltage load current. PWM/PFM-Switched Control (S-8521 Series) S-8521 Series consists DC/DC converters capable automatically switching pulse-wide modulation system (PWM) over pulse-frequency modulation system (PFM), vice versa, according load current. This series converters features current consumption. region high output load currents, S-8521 Series converters function with control, where pulse-width duty varies from This function helps keep ripple power low. certain output load currents, converters switched over control, whereby pulses having their pulse-width duty fixed skipped depending quantity load current, output switching transistor. This causes oscillation circuit produce intermittent oscillation. result, current consumption reduced efficiency losses prevented under loads. Especially output load currents region these DC/DC converters operate extremely high efficiency. Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers Rev.7.4_10 S-8520/8521 Series
Power-Off (ON/OFF Pin) This deactivates activates step-down operation.When power-off "L", voltage appears through pin, prodding switching transistor off. internal circuits stop working, substantial savings current consumption thus achieved. power-off configured shown Figure Since pull-up pull-down performed internally, please avoid operating floating state. Also, refrain from applying voltage pin, lest current consumption increase. When this power-off used, leave coupled pin. Power-Off Oscillation Circuit Activated Deactivated Output Voltage value Figure Soft-Start Function S-8520/21 Series comes with built-in soft-start circuit. This circuit enables output voltage rise gradually over specified soft-start time, when power switched when power-off remains level. This prevents output voltage from overshooting. However, soft-start function this able perfectly prevent rush current from flowing load (see Figure Since this rush current depends input voltage load conditions, recommend that evaluate testing performance with actual equipment.
S-8520A33MC (VIN
VOUT V/div)
ON/OFF
Power switched
Rush current (0.5 A/div)
ms/div)
Figure Waveforms Output Voltage Rush Current Soft-Start
Overload Protection Circuit Series) S-8520/21A, S-8520/21C Series, S-8520/21E Series come with built-in overload protection circuit. output voltage falls because overload, maximum duty state (100 will continue. this 100% duty state lasts longer than prescribed overload detection time (TPRO), overload protection circuit will hold "H," thereby protecting switching transistor inductor. When overload protection circuit functioning, reference voltage circuit will activated means Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers S-8520/8521 Series soft-start reference voltage will rise slowly from reference voltage feedback voltage obtained dividing output voltage compared each other. long reference voltage lower, will held keep oscillation inactive. reference voltage keeps rising exceeds feedback voltage, oscillation will resume. load heavy when oscillation restarted, holds level longer than specified overload detection time (TPRO), overload protection circuit will operate again, will enter intermittent operation mode, which repeats actions described above. Once overload state eliminated, resumes normal operation.
Waveforms
Overload detection time (TPRO)
Protection circuit (TSS 0.3)
Figure Waveforms Appearing Overload Protection Circuit Operates Duty Cycle S-8520/21 Series operates with maximum duty cycle When Series product provided with overload protection circuit used, switching transistor kept supply current load continually, even cases where input voltage falls below preset output voltage value. output voltage delivered under these circumstances that results from subtracting, from input voltage, voltage drop caused resistance inductance on-resistance switching transistor. Series product provided with overload protection circuit used, this protection circuit will function when duty state lasted longer than preset overload detection time (TPRO), causing enter intermittent operation mode. Under these conditions, will able supply current load continually, unlike case described preceding paragraph.
Selection Series Products Associated External Components
Method selecting series products S-8520/21 Series classified into types, according control systems (PWM PWM/PFM-Switched), different oscillation frequencies, inclusion exclusion overload protection circuit combined with another. Please select type that best suits your needs taking advantage features each type described below. Control systems: different control systems available: control system (S-8520 Series) PWM/PFMswitched control system (S-8521 Series). particular importance attached operation efficiency while load standby example, application where load current heavily varies from that standby state load starts operating high efficiency will obtained standby mode selecting PWM/PFMswitched control system (S-8521 Series). Moreover, applications where switching noise poses serious problem, control system (S-8520 Series), which switching frequency does vary with load current, preferable because eliminate ripple voltages easily using filter. Oscillation frequencies: Three oscillation frequencies-180 Series) Series), Series)-are available. Because their high oscillation frequency low-ripple voltage Series offer excellent transient response characteristics. products these series allow small-sized inductors since peak current remains smaller same load current than with products other series. addition, they also used with small output capacitors. These outstanding features Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers Rev.7.4_10 S-8520/8521 Series
make Series ideal products downsizing associated equipment. other hand, Series, having lower oscillation frequency, characterized small self-consumption current excellent efficiency under light loads. particular, Series, which employs PWM/PFM-switched control system, enables operation efficiency improved drastically when output load current approximately (See Reference Data.) Overload protection circuit: Products chosen either with overload protection circuit Series) without Series). Products with overload protection circuit Series) enter intermittent operation mode when overload protection circuit operates accommodate overloads load short-circuiting. This protects switching elements inductors. Nonetheless, application where load needs continually with current taking advantage duty cycle state, even input voltage falls below output voltage value, Series product will have used. Choose whichever product best handles conditions your application. making selection, please keep mind that upper limit operating voltage range either Series) Series), depending whether product comes with overload protection circuit built table below provides rough guide selecting product type depending requirements application. Choose product that gives largest number circles (O).
overload protection circuit required input voltage range exceeds efficiency under light loads(load current important factor operated with medium load current (200 class) operated with high load current class) important have low-ripple voltage Importance attached downsizing external components
S-8520
S-8521
symbol denotes indispensable condition, while symbol indicates that corresponding series superiority that aspect. symbol indicates particularly high superiority.
Inductor inductance value greatly affects maximum output current IOUT efficiency L-value reduced gradually, peak current increases, finally reach maximum output current IOUT when L-value fallen certain point. L-value made even smaller, IOUT will begin decreasing because current drive capacity switching transistor becomes insufficient. Conversely, L-value augmented, loss switching transistor will decrease until efficiency maximized certain L-value. L-value made even larger, loss series resistance coil will increase detriment efficiency. L-value increased S-8520/21 Series product, output voltage turn unstable some cases, depending conditions input voltage, output voltage, load current. Perform thorough evaluations under conditions actual service decide optimum L-value. many applications, selecting value A/B/C/D Series 47µH, Series will allow S-8520/21 Series product yield best characteristics well balanced manner. When choosing inductor, attention allowable current, since current applied excess allowable value will cause inductor produce magnetic saturation, leading marked decline efficiency. Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers S-8520/8521 Series Therefore, select inductor which peak current will surpass allowable current moment. peak current represented following equation continuous operation mode: IOUT (VOUT (VIN VOUT) fosc (VIN
Where fosc oscillation frequency, inductance value coil, forward voltage diode. Diode diode externally coupled should type that meets following conditions: forward voltage (Schottky barrier diode recommended). switching speed high max.). reverse direction voltage higher than VIN. current rating higher than Ipk. Capacitors (CIN, COUT) capacitor inserted input side (CIN) serves lower power impedance average input current better efficiency. Select CIN-value according impedance power supplied. rough rule thumb, should value 47µF although actual value will depend impedance power load current value. output side capacitor (COUT), select large capacitance with (Equivalent Series Resistance) smoothing ripple voltage. However, notice that capacitor with extremely (say, below such ceramic capacitor, could make output voltage unstable, depending input voltage load current conditions. Instead, tantalum electrolytic capacitor recommended. capacitance value from 47µF serve rough yardstick this selection. External Switching Transistor S-8520/21 Series operated with external switching transistor enhancement (Pch) type bipolar (PNP) typ. Enhancement type S-8520/21 Series capable directly driving power with gate capacity some 1000 When power chosen, because higher switching speed than type bipolar transistor because power losses presence base current avoided, efficiency will higher than when other types transistor employed. important parameters kept mind selecting power include threshold voltage, breakdown voltage between gate source, breakdown voltage between drain source, total gate capacity, on-resistance, current rating. swings from voltage over voltage VSS. input voltage low, with threshold voltage used that will come required. conversely, input voltage high, select whose gate-source breakdown voltage higher than input voltage least several volts. Immediately after power turned when power turned (that when step-down operation terminated), input voltage will imposed across drain source FET. Therefore, transistor needs have drain-source breakdown voltage that also several volts higher than input voltage. total gate capacity on-resistance affect efficiency. power loss charging discharging gate capacity switching operation will increase, when total gate capacity becomes larger input voltage rises higher. Therefore gate capacity affects efficiency power load current region. efficiency under light loads matter particular concern, select with small total gate capacity. regions where load current high, efficiency affected power losses caused onresistance FET. Therefore, efficiency under heavy loads particularly important Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers Rev.7.4_10 S-8520/8521 Series
your application, choose with on-resistance possible. current rating, select whose maximum continuous drain current rating higher than peak current Ipk. reference purpose, some efficiency data been included this document. applications with input voltage range less, data obtained using TM6201 Toyoda Automatic Loom Works, Ltd. IRF7606, standard International Rectifier, used applications with input voltage range over Refer "Reference Data." Bipolar type Figure shows sample circuit diagram using Toshiba 2SA1213-Y bipolar transistor (PNP). driving capacity increasing output current means bipolar transistor determined hFE-value Rb-value that bipolar transistor.
2SA1213-Y
Figure Rb-value given following equation: VIN-0.7 |IEXTL|
Find necessary base current using value bipolar transistor equation, Ipk/hFE, select smaller Rb-value. small Rb-value will certainly contribute increasing output current, will also adversely affect efficiency. Moreover, practice, current flow pulses voltage drop take place wiring resistance some other reason. Determine optimum value through experimentation. addition, speed-up capacitor inserted parallel with resistance shown Figure switching loss will reduced, leading higher efficiency. Select Cb-value using following equation guide:
However, practically-reasonable value differs depending upon characteristics bipolar transistor. Optimize value based experiment result.
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers S-8520/8521 Series Rev.7.4_10 Standard Circuits:
Using bipolar transistor:
PWM/PFMSwitched Control Circuit Oscillation Circuit
Reference Voltage Source with Soft-Start
VOUT
COUT
Figure Using MOS-FET transistor
Oscillation Circuit
Reference Voltage Source with Soft-Start
VOUT
PWM/PFMSwitched Control Circuit
COUT
Figure
Precautions:
Install external capacitors, diode, coil, other peripheral components close possible, secure grounding single location. switching regulator intrinsically produces ripple voltage spike noise, which largely dictated coil capacitors use. When designing circuit, first test them actual equipment. overload protection circuit this performs protective function detecting maximum duty time (100 choosing components, make sure that overcurrents generated short-circuits load, etc., will surpass allowable dissipation switching transistor inductor. Make sure that dissipation switching transistor will surpass allowable dissipation package. (especially time high temperature)
Power dissipation
Temperature (0C)
(mW)
Figure Power dissipation SOT-23-5 Package (Free-Air) Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers Rev.7.4_10 S-8520/8521 Series
apply electrostatic discharge this that exceeds performance ratings built-in electrostatic protection circuit. Seiko Instruments Inc. shall responsible patent infringement products including S8520/8521 Series connection with method using S-8520/8521 Series such products, product specifications country destination thereof.
Application Circuits:
External adjustment output voltage S-8520/21 Series allows adjust output voltage output voltage value over preset output voltage range products this series, when external resistances capacitor added, illustrated Figure Moreover, temperature gradient obtained inserting thermistor other element series with
S-8520/21 Series VOUT
PWM/PFMSwitched Control Circuit Oscillation Cirucuit
ON/OFF
Reference Voltage Source with Soft-Start
Figure S-8520 Series have internal impedance between VOUT pin, shown Figure Therefore, output voltage (OUT) determined output voltage value VOUT S-8520/21 Series, ratio parallel resistance value external resistance internal resistances external resistance output voltage expressed following equation: VOUT VOUT (Note: denotes combined resistance parallel.) voltage accuracy output resistances only affected IC's output voltage accuracy (VOUT ±2.4 also absolute precision external resistances absolute value deviations internal resistances designate maximum deviations absolute value external resistances RAmax RBmax, respectively, minimum deviations RAmin RBmin, respectively, maximum minimum deviations absolute value internal resistances (R1+R2)max (R1+R2) min, respectively. Then, minimum deviation value OUTmin maximum deviation value OUTmax output voltage expressed following equations: OUTmin VOUT 0.976 VOUT 0.976 RAmin RBmax )max OUTmax VOUT 1.024 VOUT 1.024 RAmax RBmin )min voltage accuracy output cannot made higher than output voltage accuracy (VOUT itself, without adjusting external resistances involved. closer voltage value output output voltage value (VOUT) brought other, more output voltage remains immune deviations absolute accuracy externally connected resistances absolute value internal resistances particular, suppress influence deviations internal resistances major contributor deviations output OUT, external resistances must limited much smaller value than that internal resistances Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers S-8520/8521 Series other hand, reactive current flows through external resistances This reactive current must reduced negligible value with respect load current actual that efficiency characteristics will degraded. This requires that value external resistance made sufficiently large. However, large value (more than external resistances would make vulnerable external noise. Check influence this value actual equipment. There tradeoff between voltage accuracy output reactive current. This should taken into consideration based requirements intended application. Deviations absolute value internal resistances vary with output voltage S-8520/21 Series, broadly classified follows: Output voltage 5.16 28.9 Output voltage 4.44 27.0 Output voltage 3.60 23.3 Output voltage 2.44 19.5 Output voltage 2.45 15.6 When value R1+R2 given equation indicated below taken calculating voltage value output OUT, median voltage deviation will obtained output OUT. maximum deviation absolute value internal resistances minimum deviation absolute value internal resistances Moreover, capacitor parallel external resistance order avoid output oscillations other types instability (See Figure 11). Make sure that larger than value given following equation: kHz) large CC-value selected, longer soft-start time than will set. equipped with tool that allows automatically calculate necessary resistance values from required voltage accuracy output OUT. will pleased assist customers determining values. Should such assistance desired, please inquire. Moreover, also ample information which peripheral components suitable with this data concerning deviations IC's characteristics. ready help customers with design application circuits. Please contact Components Sales Dept.
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers Rev.7.4_10 S-8520/8521 Series Characteristics Major Parameters (Typical values):
ISS1-VIN S-8520/21(Fosc:60 kHz) ISS1 (µA) VIN(V) Ta=25 Ta=85 Ta=-40
ISS1-VIN S-8520/21(Fosc:180 kHz) ISS1 (µA) VIN(V)
Ta=25 Ta=85 Ta=-40
ISS1-VIN S-8520/21(Fosc:300 kHz) ISS1 (µA) VIN(V) Ta=85
Fosc-VIN S-8520/21(Fosc:60 kHz) Fosc (kHz) VIN(V) Ta=25 Ta=85
Ta=25
Ta=-40
Ta=-40
Fosc-VIN S-8520/21(Fosc:180 kHz) Fosc (kHz) VIN(V) Ta=25
Fosc-VIN S-8520/21(Fosc:300 kHz) Fosc (kHz) Ta=85 Ta=-40 VIN(V)
Ta=25 Ta=-40 Ta=85
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers S-8520/8521 Series
IEXTH-VIN S-8520/21 IEXTH (mA) VIN(V) Ta=85 Ta=-40 Ta=25
IEXTL-VIN S-8520/21 IEXTL (mA) VIN(V) Ta=-40 Ta=25 Ta=85
TSS-VIN S-8520/21(Fosc:60 kHz) (ms) VIN(V) Ta=85 Ta=-40 Ta=25
(10)
TSS-VIN S-8520/21(Fosc:180 kHz) (ms) VIN(V) Ta=85 Ta=-40 Ta=25
(11)
TSS-VIN S-8520/21(Fosc:300 kHz) (ms) VIN(V) Ta=25 Ta=-40 Ta=85
(12)
TPRO-VIN S-8520/21(Fosc:60 kHz) TPRO (ms) VIN(V) Ta=25 Ta=85 Ta=-40
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers Rev.7.4_10 S-8520/8521 Series
(13)
TPRO-VIN S-8520/21(Fosc:180 kHz) TPRO (ms) VIN(V) VIN(V) Ta=85 Ta=-40 Ta=25 TPRO (ms) Ta=25 Ta=-40
(14)
TPRO-VIN S-8520/21(Fosc:300 kHz)
Ta=85
(15)
VSH-VIN S-8520/21 VIN(V) Ta=-40 Ta=25
(16)
VSL-VIN S-8520/21 VIN(V) Ta=85 Ta=-40 Ta=25
Ta=85
(17)
VOUT-VIN S-8521B30MC (Ta=25°C) 3.08 3.07 3.06 3.05 3.04 VOUT 3.03 3.02 3.01 3.00 2.99 2.98
(18)
VOUT-VIN S-8521B50MC (Ta=25°C) 5.08 5.07 5.06 5.05 5.04 VOUT 5.03 5.02 5.01 5.00 4.99 4.98
IOUT=0.1 IOUT=500
IOUT=0.1 IOUT=500
IOUT=100
IOUT=100
VIN(V)
VIN(V)
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers S-8520/8521 Series (19)
VOUT-VIN S-8521F33MC (Ta=25°C) 3.38 3.37 3.36 3.35 3.34 VOUT 3.33 3.32 3.31 3.30 3.29 3.28
(20)
VOUT-VIN S-8521F50MC (Ta=25°C) 5.07 5.06 5.05 5.04 5.03 VOUT 5.02 5.01 5.00 4.99 4.98 4.97
IOUT=0.1 IOUT=100
IOUT=0.1 IOUT=100
IOUT=500
IOUT=500
VIN(V)
VIN(V)
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers Rev.7.4_10 S-8520/8521 Series Transient Response Characteristics:
Power-On (VIN: V3.6 V9.0 IOUT: No-load)
S-8520/1C30MC (VIN:0 (2.5 V/div) VOUT V/div) ms/div) S-8520/1C30MC (VIN:0 (2.5 V/div)
VOUT V/div) ms/div)
S-8520/1A30MC (VIN:0 (2.5 V/div)
S-8520/1A30MC (VIN:0 (2.5 V/div)
VOUT V/div) ms/div)
VOUT V/div) ms/div)
S-8520/1E33MC (VIN:0 (2.5 V/div) VOUT V/div) ms/div)
S-8520/1E33MC (VIN:0 (2.5 V/div)
VOUT V/div) ms/div)
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers S-8520/8521 Series Power-Off Terminal Response (VON/OFF: V1.8 IOUT No-load)
S-8520/1C30MC (VIN:3.6 VON/OFF VOUT V/div) ms/div) S-8520/1C30MC (VIN:9.0 VON/OFF VOUT V/div) ms/div)
S-8520/1A30MC (VIN:3.6 VON/OFF VOUT V/div) ms/div)
S-8520/1A30MC (VIN:9.0 VON/OFF VOUT V/div) ms/div)
S-8520/1E33MC (VIN:4.0 VON/OFF
S-8520/1E33MC (VIN:9.0 VON/OFF
VOUT V/div) ms/div)
VOUT V/div) ms/div)
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers Rev.7.4_10 S-8520/8521 Series
Supply Voltage Variation (VIN:
S-8520/1C33MC (IOUT:10 (2.5 V/div) S-8520/1C33MC (IOUT:500 (2.5 V/div)
VOUT (0.2 V/div)
VOUT (0.2 V/div) t(0.5 ms/div) t(0.5 ms/div)
S-8520/1A30MC (IOUT:10 (2.5 V/div)
S-8520/1A30MC (IOUT:500 (2.5 V/div)
VOUT (0.2 V/div)
VOUT (0.2 V/div)
t(0.5 ms/div)
t(0.5 ms/div)
S-8520/1E33MC (IOUT:10 (2.5 V/div)
S-8520/1E33MC (IOUT:500 (2.5 V/div)
VOUT (0.2 V/div) t(0.5 ms/div)
VOUT (0.2 V/div)
t(0.5 ms/div)
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers S-8520/8521 Series Load Variation (Vin: 3.6V 4.0V Iout: 0.1mA500mA, 500mA0.1mA)
S-8520/1C30MC (VIN:3.6 IOUT S-8520/1C30MC (VIN:3.6 IOUT
VOUT (0.1 V/div)
VOUT (0.1 V/div)
t(0.1 ms/div)
ms/div)
S-8520/1A30MC (VIN:3.6 IOUT
S-8520/1A30MC (VIN:3.6 IOUT
VOUT (0.1 V/div)
VOUT (0.1 V/div)
t(0.1 ms/div)
t(10 ms/div)
S-8520/1E33MC (VIN:4.0
IOUT
S-8520/1E33MC (VIN:4.0
IOUT
VOUT (0.1V/div)
VOUT (0.1 V/div)
t(0.1 ms/div)
ms/div)
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers Rev.7.4_10 S-8520/8521 Series External Parts Reference Data:
This reference data intended help select peripheral components externally connected Therefore, this information provides recommendations external components selected with view accommodating wide variety applications. Characteristic data duly indicated table below. Table Efficiency Data
Application Inductor Transistor Diode Output Product Name Output Capacitor Voltage (µF) S-8520B30MC TM6201 MA737 CD105/47 IOUT1 S-8520F33MC MA720 D62F/22 IOUT0.5 CDH113/22 IRF7606 MA737 IOUT1 S-8521D30MC TM6201 MA720 CD54/47 IOUT0.5 Equipment standby mode involved. IRF7606 IOUT0.5 Equipment standby mode involved. TM6201 MA737 S-8521B30MC CD105/47 IOUT1 Equipment standby mode involved. IRF7606 IOUT1 Equipment standby mode involved. S-8521F33MC TM6201 MA720 D62F/22 IOUT0.5 Equipment standby mode involved. CDH113/22 IRF7606 MA737 IOUT1 Equipment standby mode involved. (10) S-8520B50MC TM6201 MA720 CD54/47 IOUT0.5 IRF7606 MA737 (11) CD105/47 IOUT1 VIN16 (12) S-8520F50MC TM6201 MA720 D62F/22 IOUT0.5 (13) CDH113/22 IRF7606 MA737 IOUT1 (14) S-8521D50MC TM6201 MA720 CD54/47 IOUT0.5 Equipment standby mode involved. (15) IRF7606 MA737 CD105/47 IOUT1 Equipment standby mode involved. (16) S-8521B50MC TM6201 MA720 CD54/47 IOUT0.5 Equipment standby mode involved. IRF7606 MA737 (17) CD105/47 IOUT1 Equipment standby mode involved. (18) S-8521F50MC TM6201 MA720 D62F/22 IOUT0.5 Equipment standby mode involved. (19) CDH113/22 IRF7606 MA737 IOUT1 Equipment standby mode involved.
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers S-8520/8521 Series Table Ripple Data
Product Name Output Voltage
Inductor (µH)
Transistor
(pF) 2200 2200
Diode
Output Capacitor (µF)
(20) (21) (22) (23) (24) (25) (26) (27) (28) (29) (30) (31)
S-8520D30MC S-8521D30MC S-8520B30MC S-8521B30MC S-8520F33MC S-8521F33MC S-8520D50MC S-8521D50MC S-8520B50MC S-8521B50MC S-8520F50MC S-8521F50MC
CD105/47 2SA1213Y CDH113/22 IRF7606 CD105/47 2SA1213Y CDH113/22 IRF7606
MA720 MA737
MA720 MA737
Table Performance Data Component Product Name CD54 CD105
CDH113 D62F MA720 MA737
Manufacturer's L-Value Name (µH) Resistance Sumida Electric Co.,
Toko Matsushita Electronics Corporation
Inductor
0.37 0.17 0.09 0.25
Max. Allowable Current 0.72 1.28 1.44 0.70
Dia. (mm) 10.0 11.0
Height (mm)
Diode
Forward current (When 0.55 Forward current (When
Output Capacity
Nichicon Matsushita Electronics Corporation External Transistor 2SA1213Y Toshiba (Bipolar PNP) Corporation External Transistor TM6201 Toyota Automatic (MOS FET) Loom Works, Ltd. IRF7606 International Rectifier
VCEO max. IC-2A max., SOT-89-3 max. max. -0.7 min. Ciss typ. 0.25 max.(Vgs=-4.5 SOT-89-3 max. -2.4 max. min. Ciss typ. 0.15 max.(Vgs=-4.5 Micro
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers Rev.7.4_10 S-8520/8521 Series
Efficiency Characteristics
S-8520B30MC IOUT Efficiency (CD105/47 µH,TM6201) Efficiency 0.01 VIN=3.6 VIN=9.0 IOUT (mA) 1000
S-8520F33MC IOUT efficiency (D62F/22 µH,TM6201) Efficiency 0.01 VIN=9 VIN=6 VIN=4
S-8520F33MC IOUT Efficiency (CDH113/22 µH,IRF7606) VIN=14 0.01 VIN=9 VIN=6 Efficiency VIN=4
IOUT (mA)
1000
IOUT (mA)
1000
S-8521D30MC IOUT Efficiency (CD54/47 µH,TM6201) 0.01 VIN=3.6 VIN=9.0 IOUT (mA) 1000
S-8521D30MC IOUT Efficiency (CD54/47 µH,IRF7606) Efficiency 0.01 VIN=3.6 VIN=9.0 IOUT (mA) 1000
Efficiency
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers S-8520/8521 Series
S-8521B30MC IOUT Efficiency (CD105/47 µH,TM6201) Efficiency 0.01 VIN=3.6 VIN=9.0 IOUT (mA) 1000 0.01 IOUT (mA)
S-8521B30MC IOUT Efficiency (CD105/47 µH,IFR7606) VIN=3.6 VIN=9.0 1000
Efficiency
S-8521F33MC IOUT Efficiency (D62F/22 µH,TM6201) Efficiency 0.01 VIN=9 VIN=6 VIN=4
S-8521F33MC IOUT Efficiency (CDH113/22 µH,IRF7606) Efficiency 0.01 VIN=14 VIN=9 VIN=6 VIN=4
IOUT (mA)
1000
IOUT (mA)
1000
(10)
S-8520B50MC IOUT Efficiency (CD54/47 µH,TM6201) Efficiency 0.01
(11)
S-8520B50MC IOUT Efficiency (CD105/47 µH,IRF7606) VIN=6.0 VIN=9.0 IOUT (mA) 1000 0.01 IOUT (mA) 1000 VIN=14 VIN=9 VIN=6
Efficiency
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers Rev.7.4_10 S-8520/8521 Series
(12)
S-8520F50MC IOUT Efficiency (D62F/22 µH,TM6201) Efficiency 0.01 VIN=9 VIN=6
(13)
S-8520F50MC IOUT Efficiency (CDH113/22 µH,IRF7606) Efficiency 0.01 VIN=14 VIN=9 VIN=6
IOUT (mA)
1000
IOUT (mA)
1000
(14)
S-8521D50MC IOUT Efficiency (CD54/47 µH,TM6201) Efficiency 0.01
(15)
S-8521D50MC IOUT Efficiency (CD105/47 µH,IRF7606) Efficiency VIN=14 VIN=6.0 VIN=9.0 IOUT (mA) 1000 0.01 IOUT (mA) VIN=9 VIN=6 1000
(16)
S-8521B50MC IOUT Efficiency (CD54/47 µH,TM6201) Efficiency 0.01
(17)
S-8521B50MC IOUT Efficiency (CD105/47 µH,IRF7606) Efficiency VIN=6.0 VIN=9.0 IOUT (mA) 1000 0.01 IOUT (mA) 1000 VIN=14 VIN=9 VIN=6
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers S-8520/8521 Series (18)
S-8521F50MC IOUT Efficiency (D62F/22 µH,TM6201) Efficiency 0.01 VIN=9 VIN=6
(19)
S-8521F50MC IOUT Efficiency (CDH113/22 µH,IRF7606) Efficiency 0.01 VIN=14 VIN=9 VIN=6
IOUT (mA)
1000
IOUT (mA)
1000
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers Rev.7.4_10 S-8520/8521 Series
Ripple Voltage Characteristics(L:CD105/47µF, Tr:2SA1213, SBD:MA720) (20)
Vrip-VIN S-8520D30MC(COUT:47 Vrip (mV) VIN(V) IOUT=500 IOUT=100 IOUT=0.1
(21)
Vrip-VIN S-8521D30MC(Cout:47 Vrip (mV) VIN(V) IOUT=500 IOUT=100 IOUT=0.1
(22)
Vrip-VIN S-8520B30MC(COUT:22 Vrip (mV) IOUT=500 IOUT=100 IOUT=0.1
(23)
Vrip-VIN S-8521B30MC(COUT:22 Vrip (mV) VIN(V) VIN(V) IOUT=500 IOUT=100 IOUT=0.1
(24)
Vrip-VIN S-8520F33MC(COUT:22 Vrip (mV) IOUT=500 IOUT=100 IOUT=0.1
(25)
Vrip-VIN S-8521F33MC(COUT:22 Vrip (mV) VIN(V) VIN(V) IOUT=500 IOUT=100 IOUT=0.1
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers S-8520/8521 Series (26)
Vrip-VIN S-8520D50MC(COUT:47 Vrip (mV) VIN(V) IOUT=500 IOUT=100 IOUT=0.1
(27)
Vrip-VIN S-8521D50MC(COUT:47 Vrip (mV) VIN(V) IOUT=500 IOUT=100 IOUT=0.1
(28)
Vrip-VIN S-8520B50MC(COUT:22 Vrip (mV) IOUT=500 IOUT=100 IOUT=0.1
(29)
Vrip-VIN S-8521B50MC(COUT:22 Vrip (mV) VIN(V) VIN(V) IOUT=500 IOUT=100 IOUT=0.1
(30)
Vrip-VIN S-8520F50MC(COUT:22 Vrip (mV) IOUT=500 IOUT=100 IOUT=0.1
(31)
Vrip-VIN S-8521F50MC(COUT:22 Vrip (mV) VIN(V) VIN(V) IOUT=500 IOUT=100 IOUT=0.1
Seiko Instruments Inc.
Control PWM/PFM Control Step-Down Switching Regulator-Controllers Rev.7.4_10 S-8520/8521 Series
PWM/PFM
S-8521D30MC PWM/PFM switching characteristics
S-8521B30MC PWM/PFM switching characteristics
IOUT (mA) 1000
IOUT (mA) 1000
S-8521F33MC PWM/PFM switching characteristics
(15)
S-8521D50MC PWM/PFM switching characteristics
IOUT (mA) 1000
IOUT (mA) 1000
(17)
S-8521B50MC PWM/PFM switching characteristics
(19)
S-8521F50MC PWM/PFM switching characteristics
IOUT (mA) 1000
IOUT (mA) 1000
Seiko Instruments Inc.
SOT-23-5
Dimensions
2.9±0.2 1.9±0.2
MP005-A
010907
Unit
0.16 -0.06
+0.1
0.95±0.1 0.4±0.1 MP005-A-P-SD-1.1
Tape Specifications
4.0±0.1(10-pitches total: 40.0±0.2)
+0.1
Reel Specifications
0.27±0.05
2.0±0.05
3000 pcs./reel
12.5max.
3°max.
+0.1
4.0±0.1
1.4±0.2
3.25±0.15
Winding core
9.0±0.3
2±0.2 (60°) (60°)
Feed direction MP005-A-C-SD-1.0
MP005-A-R-SD-1
information described herein subject change without notice. Seiko Instruments Inc. responsible problems caused circuits diagrams described herein whose related industrial properties, patents, other rights belong third parties. application circuit examples explain typical applications products, guarantee success specific mass-production design. When products described herein regulated products subject Wassenaar Arrangement other agreements, they exported without authorization from appropriate governmental authority. information described herein other purposes and/or reproduction copying without express permission Seiko Instruments Inc. strictly prohibited. products described herein cannot used part device equipment affecting human body, such exercise equipment, medical equipment, security systems, equipment, apparatus installed airplanes other vehicles, without prior written permission Seiko Instruments Inc. Although Seiko Instruments Inc. exerts greatest possible effort ensure high quality reliability, failure malfunction semiconductor products occur. user these products should therefore give thorough consideration safety design, including redundancy, fire-prevention measures, malfunction prevention, prevent accidents, fires, community damage that ensue.

S-8520/8521 Series S-8520/8521 Series consists CMOS step-down swi

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