FUJITSU SEMICONDUCTOR DATA SHEET ASSP DS04-27201-3E For Power Supply Applications Switching Regulator Controller MB3776A DESCRIPTION MB3776A is a PWM system switching regulator controller. Because of its low operating supply voltage and powerdown, the MB3776A is ideal for use in DC/DC converters for battery-powered portable equipment. FEATURES * * * * * * Wide supply voltage range: (2 V to 15 V) Wide oscillation frequency range, high-frequency oscillation: (10 kHz to 500 kHz) Push-pull output. Drive current set with external resistor Bulit-in idle period circuit Internally set error amplifier gain, few external components Bulit-in power-down function PACKAGES 8-pin Plastic DIP 8-pin Plastic SOP 8-pin Plastic SOL 8-pin Plastic SSOP (DIP-8P-M01) (FPT-8P-M01) (FPT-8P-M02) (FPT-8P-M03) MB3776A PIN ASSIGNMENT (TOP VIEW) -IN 1 8 FB CLT 2 7 OSC V CC 3 6 GND IB 4 5 OUT (DIP-8P-M01) (FPT-8P-M01) (FPT-8P-M02) (FPT-8P-M03) 2 MB3776A BLOCK DIAGRAM VCC OSC 3 7 IS IB 0.6 V CTL Reference voltage 2 1.25 V Saw-tooth waveform 0.1 V 0.1 V Internal bias & reference voltage Error Amp. -IN 1 - Is 30 k 5 OUT 4 IB P. W. M. Comp - 36 k + + X 100 + Output drive control 470 0.5 V FB D. T. C. ( 0.6 V) 8 6 GND 3 MB3776A ABSOLUTE MAXIMUM RATINGS (Ta = +25C) Parameter Power supply voltage Error amp. input voltage Output source current Output sink current Power dissipation Symbol Condition VCC Rating Unit Min. Max. -- -- 16 V VI -- -0.3 +10 V ISOURCE -- -- -50 mA ISINK -- -- 50 mA Ta +25C (DIP) -- 550 mW EIAJ -- *570 mW JEDEC -- *430 mW Ta < +25C (SSOP) -- *580 mW PD Ta +25C (SOP) Operating temperature Top -- -30 +75 C Storage temperature Tstg -- -55 +125 C * : The packages are mounted on the epoxy board (10 cm x 10 cm x 1.5 mm) WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings. RECOMMENDED OPERATING CONDITIONS Parameter Symbol Value Unit Min. Typ. Max. VCC 2.0 -- 15 V VI -0.2 -- 1.0 V ISOURCE -40 -- -- mA Output sink current ISINK -- -- 40 mA Phase compensation capacitor CP -- 0.1 -- F Timing capacitor CT 100 1000 10000 pF Timing resistor RT 1.0 3.0 5.0 k Oscillator frequency fOSC 10 200 500 kHz Operating temperature TOP -30 25 75 C Power supply voltage Error amp. input voltage Output source current WARNING: Recommended operating conditions are normal operating ranges for the semiconductor device. All the device's electrical characteristics are warranted when operated within these ranges. Always use semiconductor devices within the recommended operating conditions. Operation outside these ranges may adversely affect reliability and could result in device failure. No warranty is made with respect to uses, operating conditions, or combinations not represented on the data sheet. Users considering application outside the listed conditions are advised to contact their FUJITSU representative beforehand. 4 MB3776A ELECTRICAL CHARACTERISTICS 1. Reference Section and Error Amp. Section (Ta = +25C, VCC = 3 V) Parameter Symbol Value Condition Unit Min. Typ. Max. VFB = 450 mV 487 507 527 mV VTdV1 VCC = 2.0 V to 6.0 V -5 -- 5 mV VTdV2 VCC = 6.0 V to 15 V -5 -- 5 mV VT temp. stability VTdT Ta = -30C to +75C -3 -- 3 % Input bias current IB -1.0 -0.2 1.0 A Voltage gain AV 70 100 145 V/V Frequency band width BW -- 6 -- MHz Input threshold voltage VT input stability VT VIN = 0 V to 0.6 V -- AV = 0 dB 2. Saw-tooth Waveform Oscillator Section (Ta = +25C, VCC = 3 V) Parameter Symbol Condition Value Unit Min. Typ. Max. 160 200 240 kHz Oscillator frequency fOSC RT = 3.0 k CT = 1000 pF Frequency input stability fdV VCC = 2.0 V to 15 V -- 2 -- % Frequency temp. stability fdT Ta = -30C to +75C -- 10 -- % 3. Under Lockout Protection (Ta = +25C, VCC = 3 V) Parameter Threshold voltage Symbol Condition VTH -- Value Min. -- Typ. Max. 1.4 -- Unit V 4. Dead-time Control Section (Ta = +25C, VCC = 3 V) Parameter Max. duty cycle Symbol tDUTY Condition CT = 1000 pF RT = 3.0k VFB = 0.9 V Value Min. 60 Typ. Max. 70 85 Unit % 5 MB3776A 5. Output Section (Ta = +25C, VCC = 3 V) Parameter Output source current Symbol ISOURCE Condition Value Unit Min. Typ. Max. RB = 820 , VO = 1 V -40 -30 -20 mA Output sink current ISINK RB = 820 , VO = 0.3 V 30 60 -- mA High-level output voltage VOH RB = 820 , VO = 7 V IO = -15 mA 5.5 6.0 -- V Output voltage VOL VCTL = VCC, IO = 3 A -- 0.1 0.2 V 6. Control Section (Ta = +25C, VCC = 3 V) Parameter Value Symbol Condition Input off condition IOFF -- -300 -- -- A Input on condition ION -- -- -- -700 A Control terminal current ICTL -1.3 -1 -- mA VCC = 7 V, VCTL = 0 V Min. Typ. Max. Unit 7. All Device (Ta = +25C, VCC = 3 V) Parameter 6 Symbol Condition Value Min. Typ. Max. Unit Stand by current ICCS VCTL = VCC or CTL terminal open -- -- 0.5 A Average supply current ICC ICTL = -700 A RB = 820 -- 4.5 8 mA MB3776A MEASURMENT CIRCUIT CP MB3776A TEST INPUT 1 8 CTL 2 7 VCC = 3 V 3 6 4 5 CT RT OUTPUT ISOURCE RB CT = 1000 pF CP = 0.1 F RT = 3 k RB =820 ISOURCE 25000/RB (mA) 7 MB3776A DIAGRAM FB Terminal Waveform Saw-tooth Waveform Output 0V Output Terminal Waveform 0 mA CTL Input Current ICTL Power Supply Voltage VCC 0V 8 MB3776A TYPICAL CHARACTERISTIC Output bias current vs. Output source current Output bias current vs. Output bias voltage 1.0 VCC = 2 V Ta = +25C -40 -30 -20 -10 Output bias voltage VB (V) Output source current ISOURCE (mA) -50 VCC = 2 V Ta = +25C 0.8 0.6 0.4 0.2 0 0 0 -100 -200 -300 -400 -500 -600 -700 0 -100 -200 Output bias current IB () "L" Level output -600 -700 2.0 "H" Level output voltage VO (V) VCC = 2 V RB = 820 Ta = +25C 100 VCC = 2 V RB = 820 Ta = +25C 1.0 0.0 0 0 2 4 6 8 10 12 14 0 16 18 20 -6 -12 Ambient temp. vs. Oscillator frequency -24 -30 Timing resistor vs. Oscillator frequency 2M 210 500 k VCC = 3 V RB = 820 Ta = +25C 100 k CT = 100 pF 1M Oscillator frequency fOSC (Hz) 200 VCC = 2 V RB = 820 CT = 1000 pF RT = 3 k 190 180 170 160 150 -30 -20 -18 "H" Level output current IO (mA) "L" Level output current IO (mA) Oscillator frequency fOSC (kHz) -500 "H" Level output 200 "L" Level output voltage VO (mV) -300 -400 Output bias current IB () 0 20 40 Ambient temp. Ta (C) 60 75 50 k CT = 1000 pF 10 k 5k 1k 1k CT = 10000 pF 5 k 10 k 50 k 100 k 500 k Timing resistor RT () (Continued) 9 MB3776A (Continued) Control terminal voltage vs. Control terminal current Control terminal voltage vs. Control terminal current VCC = 2 V Ta = +25C -0.5 0 0.4 0.8 1.2 1.6 Control terminal voltage VCTL (V) 2.0 Power supply voltage vs. Input on voltage 10 Ta = +25C 8 Inpurt on current VCTL (V) -0.5 0 0.0 6 4 2 0 0 2 4 6 8 Power supply voltage VCC (V) 10 VCC = 7 V Ta = +25C -1.0 Control terminal current ICTL (mA) Control terminal current ICTL (mA) -1.0 10 0 2 4 6 8 Control terminal voltage VCTL (V) 10 MB3776A APPLICATION EXAMPLE 18 k 10 H 10 H VIN (+3 V) VO+ (+5 V) + 4.7 F - 1 2 CTL + + 10 F - - + + 10 F - - 10 F 8 1000 pF 7 0.1 F 3 k 3 6 4 5 10 F VO- (-5 V) 10 H 2 k 820 Synchronization To synchronize MB3776A controllers, the OSC terminal of each IC is shared and the same specified capacitor and resistor used on a signal IC application is connected for self-excitation oscillation. The CTL terminal controls power on/off of each IC. OUT 1 CT RT MB3776A OUT 2 MB3776A OUT 3 MB3776A VCC 11 MB3776A ORDERING INFORMATION 12 Part number Package MB3776A-P 8-pin Plastic DIP (DIP-8P-M01) MB3776APF 8-pin Plastic SOP (FPT-8P-M01) MB3776APNF 8-pin Plastic SOL (FPT-8P-M02) MB3776APFV 8-pin Plastic SSOP (FPT-8P-M03) Remarks MB3776A PACKAGE DIMENSIONS 8-pin Plastic DIP (DIP-8P-M01) +0.40 9.40 -0.30 +.016 .370 -.012 6.200.25 (.244.010) 1 PIN INDEX 0.51(.020)MIN 4.36(.172)MAX 0.250.05 (.010.002) 3.00(.118)MIN +0.30 0.99 -0 +.012 .039 -0 +0.35 0.89 -0.30 +.014 .035 -.012 C 1994 FUJITSU LIMITED D08006S-2C-3 0.460.08 (.018.003) +0.30 1.52 -0 +.012 .060 -0 2.54(.100) TYP 7.62(.300) TYP 15MAX Dimensions in mm (inches). (Continued) 13 MB3776A (Continued) 8-pin Plastic SOP (FPT-8P-M01) 2.25(.089)MAX +0.25 +.010 6.35 -0.20 .250 -.008 0.05(.002)MIN (STAND OFF) 5.300.30 (.209.012) INDEX 1.27(.050) TYP 0.450.10 (.018.004) 3.81(.150)REF +0.40 6.80 -0.20 +.016 .268 -.008 7.800.40 (.307.016) +0.05 O0.13(.005) M 0.15 -0.02 +.002 .006 -.001 0.500.20 (.020.008) Details of "A" part 0.20(.008) 0.50(.020) "A" 0.18(.007)MAX 0.10(.004) C 1994 FUJITSU LIMITED F08002S-4C-4 0.68(.027)MAX Dimensions in mm (inches). (Continued) 14 MB3776A (Continued) 8-pin Plastic SOL (FPT-8P-M02) +0.25 +.010 5.05 -0.20 .199 -.008 1.550.20(.061.008) 0.150.10 (STAND OFF) (.006.004) 3.900.30 (.154.012) 6.000.40 (.236.016) 5.000.30 (.197.012) 45 0.40(.016) 1.27(.050)TYP 0.420.10 (.017.004) O0.13(.005) M 0.200.05 (.008.002) 0.50.020 (.020.008) Details of "A" part 0.40(.016) "A" 3.81(.150)REF 0.10(.004) 0.20(.008) 0.18(.007)MAX 0.65(.026)MAX C 1994 FUJITSU LIMITED F08004S-2C-4 Dimensions in mm (inches). (Continued) 15 MB3776A (Continued) 8-pin Plastic SSOP (FPT-8P-M03) * : This dimension does not include resin protrusion. +0.20 * 3.500.10 1.25 -0.10 +.008 .049 -.004 (.138.004) 0.10(.004) INDEX 4.200.10 (.165.004) 5.20(.205) NOM 6.200.20 (.244.008) "A" 0.80(.0315) TYP 0.350.10 (.014.004) +0.05 0.10(.004) M 0.15 -0.02 +.002 .006 -.001 Details of "A" part 0.100.10(.004.004) (STAND OFF) 2.40(.094)REF C 16 1994 FUJITSU LIMITED F08005S-1C-2 0 10 0.500.20 (.020.008) Dimensions in mm (inches). MB3776A FUJITSU LIMITED All Rights Reserved. The contents of this document are subject to change without notice. Customers are advised to consult with FUJITSU sales representatives before ordering. The information and circuit diagrams in this document are presented as examples of semiconductor device applications, and are not intended to be incorporated in devices for actual use. Also, FUJITSU is unable to assume responsibility for infringement of any patent rights or other rights of third parties arising from the use of this information or circuit diagrams. The products described in this document are designed, developed and manufactured as contemplated for general use, including without limitation, ordinary industrial use, general office use, personal use, and household use, but are not designed, developed and manufactured as contemplated (1) for use accompanying fatal risks or dangers that, unless extremely high safety is secured, could have a serious effect to the public, and could lead directly to death, personal injury, severe physical damage or other loss (i.e., nuclear reaction control in nuclear facility, aircraft flight control, air traffic control, mass transport control, medical life support system, missile launch control in weapon system), or (2) for use requiring extremely high reliability (i.e., submersible repeater and artificial satellite). Please note that Fujitsu will not be liable against you and/or any third party for any claims or damages arising in connection with above-mentioned uses of the products. Any semiconductor devices have an inherent chance of failure. You must protect against injury, damage or loss from such failures by incorporating safety design measures into your facility and equipment such as redundancy, fire protection, and prevention of over-current levels and other abnormal operating conditions. If any products described in this document represent goods or technologies subject to certain restrictions on export under the Foreign Exchange and Foreign Trade Law of Japan, the prior authorization by Japanese government will be required for export of those products from Japan. F9802 FUJITSU LIMITED Printed in Japan