ASSP Power Supply Applications BIPOLAR Switching Regulator C
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DS04-27212-2E
ASSP Power Supply Applications
BIPOLAR
Switching Regulator Controller
(Low Voltage)
MB3800
DESCRIPTION
MB3800 single-channel switching regulator control voltage applications incorporating soft start function short circuit detection function. device minimum operating voltage ideal power supply battery-operated electronic equipment.
FEATURES
Wide supply voltage operating range: current consumption: Typically operation, less stand-by High speed operation possible: Maximum error amplifier gain inside peripheral components minimized. Incorporates soft start circuit. Incorporates timer-latch type short circuit detection circuit (SCP). Totem-pole type output with adjustable on/off current (for transistors) Incorporates stand-by function. Three types packages (SOP-8 SOL-8, SSOP-8)
PACKAGES
8-pin Plastic 8-pin Plastic 8-pin Plastic SSOP
(FPT-8P-M01
(FPT-8P-M02)
(FPT-8P-M03)
MB3800
ASSIGNMENT
(TOP VIEW)
BR/CTL
(FPT-8P-M01) (FPT-8P-M02) (FPT-8P-M03)
DESCRIPTION
Symbol BR/CTL Description Error amplifier inverting input Soft start setting capacitor connection Power supply Output current setting control Totem-pole type output Ground Capacitor resistor connection setting oscillation frequency Error amplifier output
MB3800
BLOCK DIAGRAM
Reference voltage supply
Sawtooth wave oscillator
1.25
Comp.
Output drive control circuit
Error Amp.
Soft start
BR/CTL
pin)
MB3800
ABSOLUTE MAXIMUM RATINGS
+25°C) Parameter Power supply voltage Output source current Output sink current Allowable dissipation Operating temperature Storage temperature Symbol
Condition
Rated Value Min. Max. 570* 430* 580* +125
Unit
SOP-8, +25°C
Tstg SOP-8, +25°C SSOP-8, +25°C
When mounted square double-sided epoxy board WARNING: Semiconductor devices permanently damaged application stress (voltage, current, temperature, etc.) excess absolute maximum ratings. exceed these ratings.
RECOMMENDED OPERATING CONDITIONS
+25°C) Parameter Power supply voltage Error amplifier input voltage BR/CTL input voltage Output source current Output sink current capacitance Phase compensation capacitance Output current setting resistance Timing resistance Timing capacitance Oscillation frequency Operating temperature Symbol
Values Min. -0.2 -0.2 Typ. Max. 5000 10.0 10000 1000
Unit
fOSC
WARNING: Recommended operating conditions normal operating ranges semiconductor device. device's electrical characteristics warranted when operated within these ranges. Always semiconductor devices within recommended operating conditions. Operation outside these ranges adversely affect reliability could result device failure. warranty made with respect uses, operating conditions, combinations represented data sheet. Users considering application outside listed conditions advised contact their FUJITSU representative beforehand.
MB3800
ELECTRICAL CHARACTERISTICS
(VCC +25°C) Parameter Circuit prevent malfunction input voltage (U.V.L.O.) Soft start Short circuit detection (S.C.P Reset voltage Threshold voltage Charging current Voltage soft start completion Charging current Threshold voltage Oscillation frequency Sawtooth wave oscillator (OSC) Frequency input stability Frequency variation with temperature Input threshold voltage input stability variation with temperature Input bias current Error amplifier Voltage gain Frequency bandwidth Maximum output voltage range Output source current Output sink current Idle period adjustment section Maximum duty cycle Symbol ICPC VtPC fOCS VTdV VTdT VOM+ VOM-
Condition
Value Min. Typ. Max. -1.0 -1.0 -0.2 0.87 0.05 -0.7 -0.7
Unit
VSCP VSCP -30°C +85°C -30°C +85°C
-1.5 -1.5 -1.0 0.78
IOM- tDUTY
0.45
(Continued)
MB3800
(Continued)
Parameter Symbol VOH1 VOH2 Output voltage Output section Output source current Output sink current Pull down resistance voltage Output current setting section/ Control section Input condition Input condition current range Stand-by current Entire device Average supply current VOL1 VOL2 IOFF ICCS BR/CTL open Condition Value Min. -1.8 Typ. Max. -0.1 Unit
DIAGRAM
voltage Reference input short circuit detection comparator Idle period setting voltage Sawtooth wave output Soft start setting voltage
waveforms
waveforms Output short circuit
Soft start Power supply control
Output short circuit
Short circuit detection
MB3800
TIME CONSTANT SOFT START SHORT CIRCUIT DETECTION
Soft Start
power capacitor connected starts charging. comparator compares soft start setting voltage proportion voltage with sawtooth waveform. comparison controls duty pin, causing soft start operation. completion soft start operation, voltage stays low, soft start setting voltage stays high, circuit enters output short circuit detection wait state. Soft start time (The time until output duty reaches approximately 50%) 0.35 [µF]
Short Circuit Protection
switching regulator output suddenly drops load effect, error amplifier output pin) fixed VOM+ capacitor starts charging. When voltage reaches approximately 0.8V, output stays low. Once protection circuit operates, circuit restored resetting power supply. Short circuit detection time [µF]
MB3800
TYPICAL CHARACTERISTICS
Supply voltage Supply current Supply current (mA) +25°C Input threshold voltage Supply voltage Input threshold voltage +25°C
Supply voltage
Supply voltage
Input threshold voltage variation ratio
Ambient temperature Input threshold voltage variation ratio
Supply voltage Input threshold voltage Input threshold voltage +25°C
Supply voltage
Ambient temperature (°C)
High level output level output voltage (mV) High level output voltage +25°C
level output +25°C
High level output current (mA)
High level output current (mA)
(Continued)
MB3800
(Continued)
BR/CTL current Output source current +25°C BR/CTL current BR/CTL voltage
Output source current (mA)
BR/CTL voltage (mV)
+25°C
-0.4
-0.8
-1.2
-1.6
-2.0
-0.4
-0.8
-1.2
-1.6
-2.0
BR/CTL current (mA)
BR/CTL current (mA) Timing resistor Oscillation frequency
BR/CTL current Supply current 10000 1000
+25°C
Oscillation frequency (Hz)
Supply current (mA)
+25°C
-100
BR/CTL current (µA)
Timing resistor
Supply voltage Frequency variation ratio
Ambient temperature Frequency variation ratio
Frequency variation ratio
Frequency variation ratio
+25°C
Supply voltage
Ambient temperature (°C)
(Continued)
MB3800
(Continued)
Oscillation frequency Maximum duty cycle +25°C
Maximum duty cycle DUTY
Oscillation frequency (Hz)
Output voltage current waveforms (reference data)
(mA) (µs)
Note: delay time depends characteristics external transistor.
Measurement circuit diagram
MB3800
MB3800
FUNCTIONAL DESCRIPTION
Switching Regulator Function
Reference voltage circuit reference voltage circuit generates temperature-compensated reference voltage (1.25V) from voltage supplied from power supply (pin addition providing reference voltage switching regulator, circuit also sets idle period. Sawtooth wave oscillator sawtooth oscillator generates sawtooth wave MHz) that stable with respect supply voltage temperature. capacitor resistor that oscillation frequency connected (pin Error amplifier (Error Amp.) error amplifier detects output voltage switching regulator outputs control signal. voltage gain fixed, connecting phase compensation capacitor (pin provides stable phase compensation system. comparator (PWM Comp.) voltage comparator inverting three non-inverting inputs. comparator voltage/pulse width converter that controls time output pulse depending input voltage. output level high when sawtooth wave lower than error amplifier output voltage, soft start setting voltage, idle period setting voltage. Output circuit output circuit totem pole type configuration drive external transistor directly. value ON/OFF current resistor connected BR/CTL (pin
Power Supply Control Function
Stand-by mode (supply current less) connecting BR/CTL (pin making open circuit. Mode Stand-by mode Operating mode
MB3800
BR/CTL
MB3800
Other Functions
Soft start short circuit detection Soft start operation connecting capacitor (pin Soft start prevents current spike start-up. completion soft start operation, (pin stays enters short circuit detection wait state. When output short circuit occurs, error amplifier output fixed VOM+ capacitor starts charging. After charging approximately output (pin (pin stays low. Once protection circuit operates, circuit restored resetting power supply. (See TIME CONSTANT SOFT START SHORT CIRCUIT DETECTION".) Circuit prevent malfunction input voltage Transients when powering instantaneous glitches supply voltage lead malfunction control cause system damage failure. circuit prevent malfunction input voltage detects input voltage comparing supply voltage internal reference voltage. detection, circuit fixes output low. system recovers when supply voltage rises back above threshold voltage malfunction prevention circuit.
APPLICATION EXAMPLE
MB3800
BR/CTL
MB3800
USAGE PRECAUTIONS
apply input voltage greater than maximum rating.
input voltages greater than maximum rating this cause damage LSI.
accordance with recommended operating conditions.
electrical characteristics guaranteed input voltage greater than maximum. Also, operation unstable input voltage less than minimum. Therefore, always accordance with recommended operating conditions.
wide ground line printed circuit board.
uses high frequency therefore generate high frequency noise, make ground line wide possible.
Take anti-static precautions.
holder inserting semiconductor which anti-static conductive. After mounting device printed circuit board, store transport board conductive container. Earth work benches, tools, measuring equipment. Ensure that maintenance personnel have resistance series between their body earth.
MB3800
ORDERING INFORMATION
Part number MB3800PF MB3800PNF MB3800PFV Package 8-pin Plastic (FPT-8P-M01) 8-pin Plastic (FPT-8P-M02) 8-pin Plastic SSOP (FPT-8P-M03) Remarks
MB3800
PACKAGE DIMENSIONS
8-pin Plastic (FPT-8P-M01)
2.25(.089)MAX 6.35
+0.25 -0.20
.250
+.010 -.008
0.05(.002)MIN (STAND OFF)
INDEX
5.30±0.30 (.209±.012)
7.80±0.40 (.307±.016)
6.80 -0.20 +.016 .268 -.008
+0.40
1.27(.050) 3.81(.150)REF
0.45±0.10 (.018±.004)
0.15 -0.02 +.002 .006 -.001
+0.05
0.50±0.20 (.020±.008)
Details part 0.20(.008)
0.50(.020) 0.10(.004) 0.18(.007)MAX 0.68(.027)MAX
1994 FUJITSU LIMITED F08002S-4C-4
Dimensions (inches).
(Continued)
MB3800
(Continued)
8-pin Plastic (FPT-8P-M02)
5.05 -0.20 .199 -.008
+0.25
+.010
1.55±0.20(.061±.008)
0.15±0.10 (STAND OFF) (.006±.004) 3.90±0.30 (.154±.012) 6.00±0.40 (.236±.016) 5.00±0.30 (.197±.012)
0.40(.016) 1.27(.050)TYP 0.42±0.10 (.017±.004)
0.20±0.05 (.008±.002) Details part
0.50±.020 (.020±.008)
0.40(.016)
3.81(.150)REF
0.10(.004)
0.20(.008) 0.18(.007)MAX 0.65(.026)MAX
1994 FUJITSU LIMITED F08004S-2C-4
Dimensions (inches).
MB3800
(Continued)
8-pin Plastic SSOP (FPT-8P-M03)
3.50±0.10
(.138±.004)
1.25 -0.10 +.008 .049 -.004
+0.20
0.10(.004)
INDEX
4.20±0.10 (.165±.004)
5.20(.205)
6.20±0.20 (.244±.008)
0.80(.0315)
0.35±0.10 (.014±.004)
0.10(.004)
0.15 -0.02 +.002 .006 -.001
+0.05
Details part 0.10±0.10(.004±.004) (STAND OFF)
2.40(.094)REF
0.50±0.20 (.020±.008)
1994 FUJITSU LIMITED F08005S-1C-2
Dimensions (inches).
MB3800
FUJITSU LIMITED
further information please contact:
Japan FUJITSU LIMITED Corporate Global Business Support Division Electronic Devices KAWASAKI PLANT, 4-1-1, Kamikodanaka Nakahara-ku, Kawasaki-shi Kanagawa 211-8588, Japan Tel: (044) 754-3763 Fax: (044) 754-3329
Rights Reserved. contents this document subject change without notice. Customers advised consult with FUJITSU sales representatives before ordering. information circuit diagrams this document presented examples semiconductor device applications, intended incorporated devices actual use. Also, FUJITSU unable assume responsibility infringement patent rights other rights third parties arising from this information circuit diagrams. FUJITSU semiconductor devices intended standard applications (computers, office automation other office equipment, industrial, communications, measurement equipment, personal household devices, etc.). CAUTION: Customers considering products special applications where failure abnormal operation directly affect human lives cause physical injury property damage, where extremely high levels reliability demanded (such aerospace systems, atomic energy controls, floor repeaters, vehicle operating controls, medical devices life support, etc.) requested consult with FUJITSU sales representatives before such use. company will responsible damages arising from such without prior approval. semiconductor devices have inherently certain rate failure. must protect against injury, damage loss from such failures incorporating safety design measures into your facility equipment such redundancy, fire protection, prevention over-current levels other abnormal operating conditions. products described this document represent goods technologies subject certain restrictions export under Foreign Exchange Foreign Trade Control Japan, prior authorization Japanese government should required export those products from Japan.
http://www.fujitsu.co.jp/
North South America FUJITSU MICROELECTRONICS, INC. Semiconductor Division 3545 North First Street Jose, 95134-1804, Tel: (408) 922-9000 Fax: (408) 922-9179 Customer Response Center Mon. Fri.: (PST) Tel: (800) 866-8608 Fax: (408) 922-9179
http://www.fujitsumicro.com/
Europe FUJITSU MIKROELEKTRONIK GmbH Siebenstein 6-10 D-63303 Dreieich-Buchschlag Germany Tel: (06103) 690-0 Fax: (06103) 690-122
http://www.fujitsu-ede.com/
Asia Pacific FUJITSU MICROELECTRONICS ASIA #05-08, Lorong Chuan Tech Park Singapore 556741 Tel: (65) 281-0770 Fax: (65) 281-0220
http://www.fmap.com.sg/
F9802 FUJITSU LIMITED Printed Japan
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