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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STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520 8521 Series
S-8520 8521 Series consists CMOS step-down switching regulator-controllers with control (S-8520 Series) switching control (S-8521 Series). These devices contain reference voltage source, oscillation circuit, error amplifier, other components. S-8520 Series provides low-ripple power, highefficiency, excellent transient characteristics thanks control circuit capable varying duty ratio linearly from 100%. 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 100%, under light load, automatically switches control with duty ratio 25%. 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 small package, providing such outstanding features current consumption. Since this series accommodate input voltage also ideal when operating adapter.
Features
current consumption During operation: max. types) max. types) max. types) During shutdown: max. Input voltage: types) types) Output voltage: Selectable between step Duty ratio: 100% control (S-8520 Series) to100% switching control (S-8521 Series) only peripheral components that used with this power transistor, coil, diode, capacitors transistor used, base resistance capacitor will also required). Oscillation frequency: typ. types) typ. types) typ. types) Soft-start function: typ. types) typ. types) typ. types) With shutdown function With built-in overload protection circuit Overload detection time: typ. type) typ. type) typ. type) Lead-free products Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series Applications
On-board power supplies battery devices portable telephones, electronic notebooks, PDAs. Power supplies audio equipment, including portable players headphone stereo equipment. Fixed voltage power supply cameras, video equipment communications equipment. Power supplies microcomputers. Conversion from four NiCd cells lithium-ion cells Conversion adapter input
Package
Package Name SOT-23-5 Package MP005-A Drawing code Tape MP005-A Reel MP005-A
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series Block Diagrams
S-8520 Series
Oscillation circuit Reference voltage source with soft-start
VOUT COUT
control circuit
Remark
diodes figure parasitic diodes. Figure
S-8521 Series
Oscillation circuit Reference voltage source with soft-start
VOUT COUT
PWM/PFM switching control circuit
Remark
diodes figure parasitic diodes. Figure
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series Product Name Structure
control types, product types, output voltage S-8540 8541 series selected user's request. Please refer Product name" definition product name Product Name List" full product names. Product name S-852
direction tape specifications*1 Product code*2
Package code SOT-23-5 Output voltage (Ex. When output voltage expressed 15.) Product type 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. Oscillation frequency kHz, With overload protection circuit. Oscillation frequency kHz, Without overload protection circuit. Control system control PWM/PFM switching control Refer taping specifications this book. Refer Product name list".
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
Product name list S-8520 Series Table Series Output voltage S-8520AxxMC Series S-8520A21MC-AVGT2G S-8520A25MC-AVKT2G S-8520A26MC-AVLT2G S-8520A27MC-AVMT2G S-8520A28MC-AVNT2G S-8520A29MC-AVOT2G S-8520A30MC-AVPT2G S-8520A31MC-AVQT2G S-8520A32MC-AVRT2G S-8520A33MC-AVST2G S-8520A34MC-AVTT2G S-8520A35MC-AVUT2G S-8520A36MC-AVVT2G S-8520A50MC-AWJT2G S-8520BxxMC Series S-8520B18MC-ARDT2G S-8520B24MC-ARJT2G S-8520B25MC-ARKT2G S-8520B27MC-ARMT2G S-8520B28MC-ARNT2G S-8520B29MC-AROT2G S-8520B30MC-ARPT2G S-8520B31MC-ARQT2G S-8520B32MC-ARRT2G S-8520B33MC-ARST2G S-8520B34MC-ARTT2G S-8520B35MC-ARUT2G S-8520B36MC-ARVT2G S-8520B40MC-ARZT2G S-8520B43MC-ASCT2G S-8520B50MC-ASJT2G S-8520B53MC-ASMT2G S-8520CxxMC Series S-8520C25MC-BRKT2G S-8520C27MC-BRMT2G S-8520C28MC-BRNT2G S-8520C29MC-BROT2G S-8520C30MC-BRPT2G S-8520C31MC-BRQT2G S-8520C32MC-BRRT2G S-8520C33MC-BRST2G S-8520C34MC-BRTT2G S-8520C35MC-BRUT2G S-8520C36MC-BRVT2G S-8520C50MC-BSJT2G
Table S-8520DxxMC Series S-8520ExxMC Series S-8520FxxMC Series Output voltage S-8520F15MC-BNAT2G S-8520E16MC-BJBT2G S-8520E18MC-BJDT2G S-8520F18MC-BNDT2G S-8520F20MC-BNFT2G S-8520D25MC-BVKT2G S-8520E25MC-BJKT2G S-8520F25MC-BNKT2G S-8520F26MC-BNLT2G S-8520D27MC-BVMT2G S-8520F27MC-BNMT2G S-8520D28MC-BVNT2G S-8520F28MC-BNNT2G S-8520D29MC-BVOT2G S-8520D30MC-BVPT2G S-8520E30MC-BJPT2G S-8520F30MC-BNPT2G S-8520F31MC-BNQT2G S-8520D31MC-BVQT2G S-8520D32MC-BVRT2G S-8520D33MC-BVST2G S-8520E33MC-BJST2G S-8520F33MC-BNST2G S-8520D34MC-BVTT2G S-8520F34MC-BNTT2G S-8520D35MC-BVUT2G S-8520D36MC-BVVT2G S-8520F36MC-BNVT2G S-8520D50MC-BWJT2G S-8520E50MC-BKJT2G S-8520F50MC-BOJT2G S-8520E52MC-BKLT2G S-8520F55MC-BOOT2G Remark Please contact marketing department availability product samples other than those specified above. Series
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
2-2. S-8521 Series Table Series Output voltage S-8521AxxMC Series S-8521A25MC-AXKT2G S-8521A27MC-AXMT2G S-8521A28MC-AXNT2G S-8521A29MC-AXOT2G S-8521A30MC-AXPT2G S-8521A31MC-AXQT2G S-8521A32MC-AXRT2G S-8521A33MC-AXST2G S-8521A34MC-AXTT2G S-8521A35MC-AXUT2G S-8521A36MC-AXVT2G S-8521A50MC-AYJT2G S-8521BxxMC Series S-8521B15MC-ATAT2G S-8521B18MC-ATDT2G S-8521B19MC-ATET2G S-8521B20MC-ATFT2G S-8521B21MC-ATGT2G S-8521B23MC-ATIT2G S-8521B25MC-ATKT2G S-8521B26MC-ATLT2G S-8521B27MC-ATMT2G S-8521B28MC-ATNT2G S-8521B29MC-ATOT2G S-8521B30MC-ATPT2G S-8521B31MC-ATQT2G S-8521B32MC-ATRT2G S-8521B33MC-ATST2G S-8521B34MC-ATTT2G S-8521B35MC-ATUT2G S-8521B36MC-ATVT2G S-8521B40MC-ATZT2G S-8521B44MC-AUDT2G S-8521B50MC-AUJT2G S-8521CxxMC Series S-8521C16MC-BTBT2G S-8521C25MC-BTKT2G S-8521C27MC-BTMT2G S-8521C28MC-BTNT2G S-8521C29MC-BTOT2G S-8521C30MC-BTPT2G S-8521C31MC-BTQT2G S-8521C32MC-BTRT2G S-8521C33MC-BTST2G S-8521C34MC-BTTT2G S-8521C35MC-BTUT2G S-8521C36MC-BTVT2G S-8521C50MC-BUJT2G
Table Series S-8521DxxMC Series S-8521ExxMC Series S-8521FxxMC Series Output voltage S-8521E15MC-BLAT2G S-8521F15MC-BPAT2G S-8521D16MC-BXBT2G S-8521E16MC-BLBT2G S-8521E17MC-BLCT2G S-8521E18MC-BLDT2G S-8521F18MC-BPDT2G S-8521E19MC-BLET2G S-8521F19MC-BPET2G S-8521D20MC-BXFT2G S-8521E20MC-BLFT2G S-8521D25MC-BXKT2G S-8521E25MC-BLKT2G S-8521F25MC-BPKT2G S-8521D27MC-BXMT2G S-8521D28MC-BXNT2G S-8521D29MC-BXOT2G S-8521D30MC-BXPT2G S-8521E30MC-BLPT2G S-8521F30MC-BPPT2G S-8521D31MC-BXQT2G S-8521D32MC-BXRT2G S-8521D33MC-BXST2G S-8521E33MC-BLST2G S-8521F33MC-BPST2G S-8521D34MC-BXTT2G S-8521F34MC-BPTT2G S-8521D35MC-BXUT2G S-8521E35MC-BLUT2G S-8521D36MC-BXVT2G S-8521F36MC-BPVT2G S-8521D40MC-BXZT2G S-8521F40MC-BPZT2G S-8521D50MC-BYJT2G S-8521E50MC-BMJT2G S-8521F50MC-BQJT2G S-8521F55MC-BQOT2G Remark Please contact marketing department availability product samples other than those specified above. Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series Configuration
SOT-23-5 view
Table name
description Shutdown "H": Normal operation
(Step-down operation)
"L": Step-down operation stopped
(All circuits deactivated)
VOUT
Output voltage monitoring
Connection external transistor
power supply
Figure
Absolute Maximum Ratings
Table Item voltage VOUT voltage
voltage
VSS-0.3 VSS+12 types VSS-0.3 VSS+18 voltage VEXT -0.3 +0.3 current IEXT Power dissipation Operating ambient temperature Topr Storage temperature Tstg +125 Caution absolute maximum ratings rated values exceeding which product could suffer physical damage. These values must therefore exceeded under conditions.
Symbol types types VOUT types types types
(Ta=25 unless otherwise specified) Absolute maximum ratings Unit VSS-0.3 VSS+12 VSS-0.3 VSS+18 VSS-0.3 VSS+12 VSS-0.3 VSS+18
Power dissipation (PD) [mW]
Temperature (Ta) [°C]
Figure
Power dissipation Package (Before mounting)
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series Electrical Characteristics
type, type Table (Ta=25 unless otherwise specified) Measurement Min. Typ. Max. Unit circuit VOUT(S) VOUT(S) VOUT(S) 10.0 16.0 -2.3 -3.7 -5.3 -6.7 -8.0 +4.3 +7.0 +9.9 +12.6 +15.0 -4.5 -7.0 -9.3 -11.3 -13.3 +8.4 +13.2 +17.5 +21.4 +25.1 ±VOUT(S)
Parameter Output voltage*1 Input voltage Current consumption Current consumption during shutdown output current
Symbol VOUT(E) ISS1 ISSS IEXTH
Condition type type
IEXTL
Line regulation Load regulation Output voltage temperature coefficient Oscillation frequency
VOUT1 VOUT2 VOUT fosc
S-8520 8521x15 S-8520 8521x25 S-8520 8521x35 S-8520 8521x45 S-8520 8521x55 VEXT=0.4 S-8520 8521x15 S-8520 8521x25 S-8520 8521x35 S-8520 8521x45 S-8520 8521x55 VOUT(S)2.0 VIN=2.5 2.94 VOUT(S)>2.0 Load current=10 IOUT Ta=-40 Measured waveform VOUT(S)2.4 pin. VOUT(S)2.5
VEXT=VIN-0.4
control switching duty ratio PFMDuty load, Measured waveform pin. (S-8521 Series) Judged oscillation input voltage Judged oscillation stop -0.1 input leakage current -0.1 Soft start time 16.0 Overload detection time Duration from time VOUT reduced tpro type) time obtains VIN. Efficiency EFFI External parts Coil: Sumida Corporation CD54 Diode: Matsushita Electric Industrial Co., Ltd. MA720 (Shottky type) Capacitor: Matsushita Electric Industrial Co., Ltd. 22µF tantalum type) Transistor: Toshiba Corporation 2SA1213Y Base resistance (Rb): 0.68 Base capacitor (Cb): 2200 (Ceramic type) recommended components connected unless otherwise indicated. (VIN=2.5 VOUT(S)2.0 IOUT=120
connected pin.
VOUT(S): Specified output voltage value, VOUT(E): Actual output voltage value
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
type, type Table
Parameter Output voltage*1 Input voltage Current consumption Current consumption during shutdown output current
Symbol VOUT(E) ISS1 ISSS IEXTH
Condition type type
S-8520 8521x15 S-8520 8521x25 S-8520 8521x35 S-8520 8521x45 S-8520 8521x55 VEXT=0.4 S-8520 8521x15 S-8520 8521x25 S-8520 8521x35 S-8520 8521x45 S-8520 8521x55 VOUT(S)2.0 VIN=2.5 2.94 VOUT(S)>2.0 Load current=10 IOUT VEXT=VIN-0.4
(Ta=25 unless otherwise specified) Measurement Min. Typ. Max. Unit circuit VOUT(S) VOUT(S) VOUT(S) 10.0 16.0
-2.3 -3.7 -5.3 -6.7 -8.0 +4.3 +7.0 +9.9 +12.6 +15.0 -4.5 -7.0 -9.3 -11.3 -13.3 +8.4 +13.2 +17.5 +21.4 +25.1 ±VOUT(S)
IEXTL
Line regulation Load regulation Output voltage temperature coefficient Oscillation frequency
VOUT1
VOUT2 VOUT Ta=-40 fosc Measured waveform VOUT(S)2.4 pin. VOUT(S)2.5
control switching duty ratio PFMDuty load, Measured waveform (S-8521 Series) Judged oscillation input voltage Judged oscillation stop -0.1 input leakage current -0.1 Soft start time 12.0 24.0 Overload detection time Duration from time VOUT reduced tpro 14.0 28.0 type) time obtains VIN. Efficiency EFFI External parts Coil: Sumida Corporation CD54 Diode: Matsushita Electric Industrial Co., Ltd. MA720 (Shottky type) Capacitor: Matsushita Electric Industrial Co., Ltd. 22µF tantalum type) Transistor: Toshiba Corporation 2SA1213Y Base resistance (Rb): 0.68 Base capacitor (Cb): 2200 (Ceramic type) recommended components connected unless otherwise indicated. (VIN=2.5 VOUT(S)2.0 IOUT=120
connected pin.
VOUT(S): Specified output voltage value, VOUT(E): Actual output voltage value
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
type, type Table
Parameter Output voltage*1 Input voltage Current consumption Current consumption during shutdown output current
Symbol VOUT(E) ISS1 ISSS IEXTH
Condition type type
(Ta=25 unless otherwise specified) Measurement Min. Typ. Max. Unit circuit VOUT(S) VOUT(S) VOUT(S) 10.0 16.0
-2.3 -3.7 -5.3 -6.7 -8.0 +4.3 +7.0 +9.9 +12.6 +15.0 -4.5 -7.0 -9.3 -11.3 -13.3 +8.4 +13.2 +17.5 +21.4 +25.1 ±VOUT(S)
IEXTL
Line regulation Load regulation Output voltage temperature coefficient Oscillation frequency control switching duty ratio (S-8521 Series) input voltage
VOUT1
VOUT2 VOUT Ta=-40 fosc Measured waveform pin.
S-8520 8521x15 S-8520 8521x25 S-8520 8521x35 S-8520 8521x45 S-8520 8521x55 VEXT=0.4 S-8520 8521x15 S-8520 8521x25 S-8520 8521x35 S-8520 8521x45 S-8520 8521x55 VOUT(S)2.0 VIN=2.5 2.94 VOUT(S)>2.0 Load current=10 IOUT
VEXT=VIN-0.4
VOUT(S)2.4 VOUT(S)2.5
PFMDuty load, Measured waveform
Judged oscillation Judged oscillation stop -0.1 input leakage current -0.1 Soft start time Overload detection time Duration from time VOUT reduced tpro type) time obtains VIN. Efficiency EFFI External parts Coil: Sumida Corporation CD54 Diode: Matsushita Electric Industrial Co., Ltd. MA720 (Shottky type) Capacitor: Matsushita Electric Industrial Co., Ltd. 22µF tantalum type) Transistor: Toshiba Corporation 2SA1213Y Base resistance (Rb): 0.68 Base capacitor (Cb): 2200 (Ceramic type) recommended components connected unless otherwise indicated. (VIN=2.5 VOUT(S)2.0 IOUT=120
connected pin.
VOUT(S): Specified output voltage value, VOUT(E): Actual output voltage value
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series Measurement Circuits
open VOUT open
Figure
Oscilloscope
VOUT
Figure
0.68
2200 VOUT
Figure
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series Operation
Switching control method 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. S-8520 series pulse width varies range from 100% according load current, ripple voltage produced switching easily removed filter since switching frequency always constant. These converters thus provide low-ripple voltage over wide range input voltage load current. will skippped current consumption when pulse width load, input current voltage high.
switching control (S-8521 Series)
S-8521 series DC-DC converter that automatically switches between pulse width modulation method (PWM) pulse frequency modulation method (PFM), depending load current, features current consumption. S-8521 series operates under control with pulse width duty changing from 100% when output load current high. other hand, when output current low, S-8541 series operates under control with pulse width duty fixed 25%, pulses skipped according load current. oscillator thus oscillates intermittently that resultant lower current consumption prevents reduction efficiency when load current low. switching point from control control depends external devices (coil, diode, etc.), input voltage, output voltage. This series especially efficient DC-DC converter output current around
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
Soft start function
S-8520 8521 Series comes with built-in soft start circuit. This circuit enables output voltage (VOUT) rise gradually over specified soft start time (t), when power switched when remains level. This prevents output voltage from overshooting. However, soft start function this able perfectly prevent rush current from flowing load (Refer Figure Since this rush current depends input voltage load conditions, recommend that evaluate testing performance with actual equipment.
S-8520A33MC (VIN: 04.0 VOUT V/div] Rush current [0.5 A/div] ms/div]
Figure Waveforms output voltage rush current soft start
(Shutdown pin)
This deactivates activates step-down operation. When "L", voltage appears through pin, prodding switching transistor off. internal circuits stop working, substantial savings current consumption thus achieved. 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 used, leave coupled pin.
Table Oscillation Circuit Activated Deactivated
Output Voltage value
Figure
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
Overload protection circuit types) types S-8520 8521 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 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
Figure
Waveforms appearing overload protection circuit operates
100% duty cycle
S-8520 8521 Series operates with maximum duty cycle 100%. When types products 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. types products provided with overload protection circuit used, this protection circuit will function when 100% 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.
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STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series Selection Series Products Associated External Components
Method selecting series products
S-8520 8521 Series classified into types, according control systems (PWM control Switching control), 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) switching 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 switching 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
oscillation frequencies selectable types), types), types). Because their high oscillation frequency ripple voltage types offer excellent transient response characteristics. products these series allow smallsized 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 make types ideal products downsizing associated equipment. other hand, types, having lower oscillation frequency, characterized small self-consumption current excellent efficiency under light loads. particular, type, which employs switching control system, enables operation efficiency improved drastically when output load current approximately (Refer "Reference Data").
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
Overload protection circuit
Products chosen either with overload protection circuit types) without types). Products with overload protection circuit types) 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, types product will have used. Choose whichever product best handles conditions your application. making selection, please keep mind that upper limit operating voltage range either types) types), depending whether product comes with overload protection circuit built Table provides rough guide selecting product type depending requirements application. Choose product that gives largest number circles
Table S-8520 Series
overload protection circuit required input voltage range exceeds efficiency under light loads (load current1 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 Remark Indispensable condition Superiority requirement Particularly superiority requirement
S-8521 Series
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
Inductor
inductance value greatly affects maximum output current (IOUT) efficiency peak current (IPK) increases decreasing stability circuit improves IOUT increases. made even smaller, efficiency falls causing decline current drive capacity switching transistor, IOUT decreases. loss switching transistor decreases increasing efficiency becomes maximum certain value. Increasing further decreases efficiency loss coil resistance. IOUT also decreases. When inductance large S-8520 8521 series product, output voltage grow unstable some cases, depending conditions input voltage, output voltage, load current. Perform sufficient evaluation under actual condition decide optimum inductance. recommended inductances types types. When choosing inductor, attention allowable current should paid since current over allowable value will cause magnetic saturation inductor, leading marked decline efficiency. inductor should therefore selected surpass allowable current. peak current (IPK) represented following equation non-continuous operation mode:
VOUT VOUT fosc Where fosc oscillation frequency, forward voltage diode. IOUT
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 value according impedance power supplied. rough rule thumb, should value 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 serve rough yardstick this selection.
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
External transistor external transistor enhancement (Pch) type bipolar (PNP) typ. Enhancement (Pch) type
capable directly driving with gate capacity some 1000 When 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 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 on-resistance FET. Therefore, efficiency under heavy loads particularly important your application, choose with on-resistance possible. current rating, select whose maximum continuous drain current rating higher than IPK. reference purpose, some efficiency data been included this document. applications with input voltage range less, data obtained using TM6201 Toyoda Industries Corporation. IRF7606, standard International Rectifier Corporation, used applications with input voltage range over (Refer "Reference Data").
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
Bipolar type
Figure shows sample circuit diagram using Toshiba Corporation 2SA1213-Y bipolar transistor (PNP). driving capacity increasing output current means bipolar transistor determined value value that bipolar transistor.
Toshiba Corporation 2SA1213-Y
Figure
Rb-value given following equation: IEXTL
Find necessary base current (Ib) using (hFE) value bipolar transistor equation, select smaller value. small 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 (Cb) inserted parallel with resistance shown Figure switching loss will reduced, leading higher efficiency. Select value using following equation guide: fosc Select value after performing sufficient evaluation since optimum value differs depending upon characteristics bipolar transistor.
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series Standard Circuits
Using bipolar transistor
control PWM/PFM switching cotrol circuit Oscillation circuit Reference voltage source with soft start
VOUT COUT
Figure Using transistor
Oscillation circuit Reference voltage source with soft start
VOUT COUT
control PWM/PFM switching control circuit
Figure Caution above connection diagram constant will guarantees successful operation. Perform through evaluation using actual application constant.
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series Precautions
Mount external capacitors, diode coil close possible secure grounding single location. Characteristics ripple voltage spike noise occur containing switching regulators. Moreover, rush current flows time power supply injection. Because these largely depend coil, capacitor impedance power supply used, fully check them using actually mounted model. overload protection circuit this performs protective function detecting maximum duty time (100 choosing components, make sure that over currents generated short-circuits load, etc., will surpass allowable dissipation switching transistor inductor. Make sure that dissipation switching transistor (especially high temperature) does exceed allowable dissipation package. apply electrostatic discharge this that exceeds performance ratings built-in electrostatic protection circuit. claims responsibility disputes arising connection with infringement products including this upon patents owned third party.
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series Application Circuits
External adjustment output voltage
S-8520 8521 Series allows adjust output voltage output voltage value over preset output voltage range products this series, when external resistances RB), capacitor (CC) added, illustrated Figure Moreover, temperature gradient obtained inserting thermistor other element series with
S-8520/8521Series VOUT
control PWM/PFM switching control circuit Oscillation circuit
Reference voltage source with soft start
Caution
Figure above connection diagram constant will guarantees successful operation. Perform through evaluation using actual application constant.
S-8520 8521 Series have internal impedance between VOUT pin, shown Figure Therefore, (the output voltage) determined output voltage value (VOUT) S-8520 8521 Series, ratio parallel resistance value external resistance (RB) internal resistances (R1+R2) external resistance (RA). output voltage expressed following equation: R2)) voltage accuracy 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 RAmax RBmax, respectively, minimum deviations RAmin RBmin, respectively, maximum minimum deviations absolute value (R1+R2) (R1+R2) min, respectively. Then, minimum deviation value OUTmin maximum deviation value OUTmax expressed following equations: max.) min.) voltage accuracy cannot made higher than output voltage accuracy (VOUT ±2.4 itself, without adjusting involved. closer voltage value output output voltage value (VOUT) brought other, more output voltage remains immune deviations absolute accuracy absolute value particular, suppress influence deviations major contributor deviations OUT, must limited much smaller value than that
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
other hand, reactive current flows through This reactive current must reduced negligible value with respect load current actual that efficiency characteristics will degraded. This requires that value made sufficiently large. However, large value (more than would make vulnerable external noise. Check influence this value actual equipment. There tradeoff between voltage accuracy reactive current. This should taken into consideration based requirements intended application. Deviations absolute value internal resistances vary with output voltage S-8520 8521 Series, broadly classified follows:
Table Deviations absolute value 5.16 28.9 4.44 27.0 3.60 23.3 2.44 19.5 2.45 15.6
Output voltage
When value R1+R2 given equation indicated below taken calculating voltage value output OUT, median voltage deviation will obtained OUT. R1+R2=2÷(1÷maximum deviation absolute value R2+1÷minimum deviation absolute value Moreover, capacitor (CC) parallel external resistance (RA) order avoid output oscillations other types instability. (Refer Figure 14.) Make sure that larger than value given following equation: kHz) large value selected, longer soft start time than will set. equipped with tool that allows automatically calculate necessary resistance values from required voltage accuracy 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.
shows combined resistance parallel.
above connection diagram constant will guarantees successful operation. Perform through evaluation using actual application constant.
Caution
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STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series Characteristics (Typical Data)
Examples major parameters characteristics Current consumption (ISS1)-Input voltage (VIN)
ISS1 [µA] Ta=25°C Ta=85°C Ta=-40°C (fosc=60 kHz)
ISS1 [µA]
(fosc=180 kHz) Ta=25°C Ta=85°C Ta=-40°C
ISS1 [µA] Ta=25° Ta=85°C
(fosc=300 kHz)
Ta=-40°C
Oscillation frequency (fosc)-Input voltage (VIN)
fosc [kHz] Ta=-40°C
fosc [kHz]
(fosc=60 kHz)
(fosc=180 kHz)
Ta=25°C Ta=85°C
Ta=25°C
Ta=85°C Ta=-40°C
fosc [kHz]
(fosc=300 kHz)
Ta=25°C Ta=-40° Ta=85°C
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
output current (IEXTH)-Input voltage (VIN)(4) output current (IEXTL)-Input voltage (VIN)
IEXTH [mA]
IEXTL [mA]
Ta=-40°C Ta=25°C
Ta=-40°C Ta=25°C Ta=85°C
Ta=85°C
Soft start time (tSS)-Input voltage (VIN)
[ms]
[ms]
(fosc=60 kHz) Ta=-40°C Ta=25°C
[ms]
(fosc=180 kHz)
Ta=-40°C Ta=25°C
Ta=85°C
Ta=85°C
(fosc=300 kHz)
Ta=-40°C Ta=85°C
Ta=25°C
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
Overload detection time (tpro)- Input voltage (VIN)
tpro [ms]
(fosc=60 kHz)
Ta=85°C Ta=-40°C Ta=25°C
(fosc=180 kHz)
Ta=85°C
tpro [ms]
Ta=-40°C Ta=25°C
(fosc=300 kHz) Ta=85°C
tpro [ms]
Ta=25°C Ta=-40°C
input voltage (VSH)-Input voltage input voltage (VSL)-Input voltage (VIN) (VIN)
Ta=85°C Ta=-40°C
Ta=85°C Ta=-40°C Ta=25°C
Ta=25°C
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
Output voltage (VOUT)-Input voltage(VIN)
S-8521B30MC
3.08 3.07 3.06 3.05 3.04 3.03 3.02 3.01 3.00 2.99 2.98 (Ta=25°C) IOUT=0.1 IOUT=500
S-8521B50MC
5.08 5.07 5.06 5.05 5.04 5.03 5.02 5.01 5.00 4.99 4.98 (Ta=25°C)
IOUT=0.1 IOUT=500
VOUT
IOUT=100
VOUT
IOUT=100
S-8521F33MC
3.38 3.37 3.36 3.35 3.34 3.33 3.32 3.31 3.30 3.29 3.28 (Ta=25°C) IOUT=0.1 IOUT=100
S-8521F50MC
5.07 5.06 5.05 5.04 5.03 5.02 5.01 5.00 4.99 4.98 4.97 (Ta=25°C) IOUT=0.1 IOUT=100
VOUT
VOUT
IOUT=500
IOUT=500
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
Transient Response Characteristics Power-on (IOUT: load)
(VIN=03.6 [2.5 V/div] VOUT V/div] ms/div] [2.5 V/div] VOUT V/div] ms/div]
(VIN=03.6 [2.5 V/div] VOUT V/div] ms/div] [2.5 V/div] VOUT V/div)] ms/div] (VIN=09.0
S-8520 8521C30MC
(VIN=09.0
S-8520 8521A30MC
S-8520 8521E33MC
(VIN=04.0 [2.5 V/div] VOUT V/div] ms/div] [2.5 V/div] VOUT V/div] ms/div] (VIN=09.0
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
Shutdown response VON/ =01.8 IOUT=No load)
(VIN=3.6 (VIN=9.0
S-8520 8521C30MC
V/div] VOUT V/div] ms/div]
V/div] VOUT V/div] ms/div]
(VIN=3.6 (VIN=9.0
S-8520 8521A30MC
V/div] VOUT V/div] ms/div]
V/div] VOUT V/div] ms/div]
S-8520 8521E33MC
(VIN=4.0 (VIN=9.0
V/div]
V/div]
VOUT V/div] ms/div]
VOUT V/div] ms/div]
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
Supply voltage variation (VIN=49
(IOUT=10 [2.5 V/div] VOUT [0.2 V/div]
S-8520 8521C30MC
(IOUT=500 [2.5 V/div]
VOUT [0.2 V/div]
[0.5 ms/div]
[0.5 ms/div] (IOUT=10mA)
(IOUT=500 [2.5 V/div] VOUT [0.2 V/div]
S-8520 8521A30MC
[2.5 V/div]
VOUT [0.2 V/div] [0.5 ms/div]
[0.5 ms/div] (IOUT=10
S-8520 8521E33MC
(IOUT=500 [2.5 V/div] VOUT [0.2 V/div]
[2.5 V/div]
VOUT [0.2 V/div] [0.5 ms/div]
[0.5 ms/div]
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
Load variation S-8520 8521C30MC
(VIN=3.6 IOUT=0.1500 IOUT
IOUT (VIN=3.6 IOUT=5000.1
VOUT [0.1 V/div]
VOUT [0.1 V/div]
[0.1 ms/div]
ms/div]
(VIN=3.6 IOUT=5000.1 IOUT
S-8520 8521A30MC
(VIN=3.6 IOUT=0.1500 IOUT
VOUT [0.1 V/div]
VOUT [0.1 V/div]
[0.1 ms/div]
ms/div]
S-8520 8521E33MC
(VIN=4.0 IOUT=0.1500 IOUT
IOUT (VIN=4.0 IOUT=5000.1
VOUT [0.1 V/div]
VOUT [0.1 V/div]
[0.1 ms/div)
ms/div]
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series 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 External parts efficiency data Output Inductor Transistor Diode Application capacitor MA737 IOUT1 VIN10 CD105 TM6201 MA720 IOUT0.5 VIN10 D62F CDH113 IRF7606 MA737 IOUT1 VIN16 IOUT0.5 VIN10 TM6201 With equipment standby mode MA720 CD54 IOUT0.5 VIN16 IRF7606 With equipment standby mode IOUT1 VIN10 TM6201 With equipment standby mode MA737 CD105 IOUT1 VIN16 IRF7606 With equipment standby mode IOUT0.5 VIN10 TM6201 MA720 D62F With equipment standby mode CDH113 IOUT1 VIN16 IRF7606 MA737 With equipment standby mode TM6201 MA720 IOUT0.5 VIN10 CD54 IRF7606 MA737 IOUT1 VIN16 CD105 TM6201 MA720 IOUT0.5 VIN10 D62F CDH113 IRF7606 MA737 IOUT1 VIN16 IOUT0.5 VIN10 TM6201 MA720 CD54 With equipment standby mode IOUT1 VIN16 IRF7606 MA737 CD105 With equipment standby mode IOUT0.5 VIN10 TM6201 MA720 CD54 With equipment standby mode IOUT1 VIN16 IRF7606 MA737 CD105 With equipment standby mode IOUT0.5 VIN10 TM6201 MA720 D62F With equipment standby mode CDH113 IOUT1 VIN16 IRF7606 MA737 With equipment standby mode
Product name S-8520B30MC S-8520F33MC S-8520F33MC S-8521D30MC S-8521D30MC
Output voltage
S-8521B30MC S-8521B30MC S-8521F33MC S-8521F33MC S-8520B50MC S-8520B50MC S-8520F50MC S-8520F50MC S-8521D50MC S-8521D50MC S-8521B50MC S-8521B50MC S-8521F50MC S-8521F50MC
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
Table External parts Ripple data Product name S-8520D30MC S-8521D30MC S-8520B30MC S-8521B30MC S-8520F33MC S-8521F33MC S-8520D50MC S-8521D50MC S-8520B50MC S-8521B50MC S-8520F50MC S-8521F50MC Output voltage Inductor Transistor Diode Output capacitor 2200 2200 MA720 MA737 MA720 MA737
CD105 CDH113 CD105
2SA1213Y
IRF7606
2SA1213Y
CDH113 Table IRF7606
Performance Data Maximum allowable Diameter current 0.72 0.37 1.28 10.0 0.17 1.44 11.0 0.09 0.70 0.25 Forward current VF=0.55 Forward current VF=0.5 VCEO max., max., 240, SOT-89-3 package max., max., -0.7 min., Ciss typ., 0.25 max. (VGS=-4.5 SOT-89-3 package max., -2.4 max., min., Ciss typ., 0.15 max. (VGS=-4.5 Micro package Height
Component Inductor
Product name Manufacturer name value resistance CD54 CD105 CDH113 D62F MA720 MA737
Sumida Corporation Toko Ink. Matsushita Electric Industrial Co., Ltd. Nichicon Corporation Matsushita Electric Industrial Co., Ltd. Toshiba Corporation Toyota Industries Corporation International Rectifier Corporation
Diode Output capacity
External transistor (Bipolar PNP) External transistor (MOS FET)
2SA1213Y
TM6201
IRF7606
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
Efficiency Characteristics: Output current (IOUT)-Efficiency (EFFI) S-8520B30MC
EFFI 0.01 IOUT [mA] VIN=3.6 VIN=9.0 1000 (CD105/47 TM6201)
S-8520F33MC
EFFI 0.01 IOUT [mA] 1000 VIN=9 VIN=6 VIN=4 (D62F/22 TM6201) EFFI 0.01 IOUT [mA] 1000 (CDH113/22 IRF7606) VIN=14 VIN=9 VIN=6 VIN=4
S-8521D30MC
EFFI (CD54/47 TM6201)
EFFI 0.01
(CD54/47 IRF7606)
0.01 IOUT [mA] VIN=3.6 VIN=9.0 1000
VIN=3.6 VIN=9.0 IOUT [mA] 1000
S-8521B30MC
EFFI 0.01 IOUT [mA] VIN=3.6 VIN=9.0 1000
EFFI
(CD105/47 TM6201)
0.01
(CD105/47 IFR7606)
VIN=3.6 VIN=9.0 IOUT [mA] 1000
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
S-8521F33MC
EFFI 0.01 IOUT [mA] 1000 VIN=9 VIN=6 VIN=4 (D62F/22 TM6201)
EFFI 0.01 IOUT [mA] 1000 (CDH113/22 IRF7606) VIN=14 VIN=9 VIN=6 VIN=4
S-8520B50MC
EFFI
EFFI
(CD54/47 TM6201)
0.01 VIN=14 VIN=9 VIN=6
(CD105/47 IRF7606)
0.01 IOUT [mA] VIN=6.0 VIN=9.0 1000
IOUT [mA]
1000
S-8520F50MC
EFFI 0.01 IOUT [mA] 1000 VIN=9 VIN=6
EFFI
(D62F/22 TM6201)
0.01 VIN=14 VIN=9 VIN=6
(CDH113/22 IRF7606)
IOUT [mA]
1000
S-8521D50MC
EFFI
EFFI
(CD54/47 TM6201)
0.01
(CD105/47 IRF7606)
0.01 IOUT [mA] VIN=6.0 VIN=9.0 1000
VIN=14 VIN=9 VIN=6 IOUT [mA] 1000
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
S-8521B50MC
EFFI EFFI 0.01 IOUT [mA] VIN=6.0 VIN=9.0 1000 (CD54/47 TM6201) 0.01 IOUT [mA] 1000 (CD105/47 IRF7606) VIN=14 VIN=9 VIN=6
(10) S-8521F50MC
EFFI 0.01 IOUT [mA] 1000 VIN=9 VIN=6 EFFI (D62F/22 TM6201) 0.01 IOUT [mA] 1000 (CDH113/22 IRF7606) VIN=14 VIN=9 VIN=6
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
Ripple Voltage Characteristics: Ripple voltage (Vrip)-Input voltage (VIN) CD105 2SA1213, SBD: MA720) S-8521D30MC
(COUT=47 IOUT=500 IOUT=100 IOUT=0.1
S-8520D30MC
Vrip [mV]
Vrip [mV] IOUT=500 IOUT=100 IOUT=0.1
(COUT=47
S-8520B30MC
Vrip [mV] IOUT=100 IOUT=0.1
IOUT=500
S-8521B30MC
(COUT=22
Vrip [mV] IOUT=500 IOUT=100 IOUT=0.1 (COUT=22
S-8520F33MC
Vrip [mV] IOUT=500 IOUT=100 IOUT=0.1 (COUT=22
S-8521F33MC
Vrip [mV] IOUT=500 IOUT=100 IOUT=0.1 (COUT=22
S-8520D50MC
Vrip [mV] IOUT=500 IOUT=100 IOUT=0.1 (COUT=47
S-8521D50MC
Vrip [mV] IOUT =500 IOUT =100 IOUT =0.1 (COUT=47
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
S-8520B50MC
Vrip [mV] (COUT=22
(10) S-8521B50MC
Vrip [mV] (COUT=22
IOUT =500 IOUT =100 IOUT =0.1
IOUT=500 IOUT=100 IOUT=0.1
(11) S-8520F50MC
Vrip [mV] IOUT=500 IOUT=100 IOUT=0.1 (COUT=22
(12) S-8521F50MC
Vrip [mV] IOUT=500 IOUT=100 IOUT=0.1 (COUT=22
Seiko Instruments Inc.
STEP-DOWN, CONTROL SWITCHABLE SWITCHING REGULATOR CONTROLLOR Rev.8.1_00 S-8520 8521 Series
switching characteristics: Input voltage (VIN)-Output current (IOUT) S-8521B30MC
S-8521D30MC
IOUT [mA]
1000
IOUT [mA]
1000
S-8521F33MC
S-8521D510MC
IOUT [mA]
1000
IOUT [mA]
1000
S-8521B50MC
S-8521F50MC
IOUT [mA]
1000
IOUT [mA]
1000
Seiko Instruments Inc.
2.9±0.2 1.9±0.2
0.16 -0.06
+0.1
0.95±0.1 0.4±0.1
MP005-A-P-SD-1.2
TITLE SCALE UNIT
SOT235-A-PKG Dimensions MP005-A-P-SD-1.2
Seiko Instruments Inc.
4.0±0.1(10 pitches:40.0±0.2)
+0.1
2.0±0.05
0.25±0.1
+0.2
4.0±0.1 1.4±0.2
3.2±0.2
Feed direction
MP005-A-C-SD-2.1
TITLE SCALE UNIT
SOT235-A-Carrier Tape MP005-A-C-SD-2.1
Seiko Instruments Inc.
12.5max.
Enlarged drawing central part
9.0±0.3
(60°)
(60°)
MP005-A-R-SD-1.1
TITLE SCALE UNIT
SOT235-A-Reel MP005-A-R-SD-1.1
QTY. 3,000
Seiko Instruments Inc.
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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