FUJITSU SEMICONDUCTOR DATA SHEET ASSP DS04-27201-4E 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 SOP 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 VCC 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: The recommended operating conditions are required in order to ensure the normal operation of the semiconductor device. All of the device's electrical characteristics are warranted when the device is operated within these ranges. Always use semiconductor devices within their recommended operating condition ranges. 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 representatives beforehand. 4 MB3776A ELECTRICAL CHARACTERISTICS 1. Reference Section and Error Amp. Section (Ta = +25C, VCC = 3 V) Parameter Symbol Condition Value 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 = -30 C to +75 C -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 = 3.0 k VFB = 0.9 V Value Min Typ Max 60 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 Symbol Condition Input off condition IOFF Input on condition ION Control terminal current ICTL Value Unit Min Typ Max -- -300 -- -- A -- -- -- -700 A -1.3 -1 -- mA VCC = 7 V, VCTL = 0 V 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) DIAGRAM FB Terminal Waveform Saw-tooth Waveform Output 0V Output Terminal Waveform 0 mA CTL Input Current ICTL Power Supply Voltage VCC 0V 7 MB3776A Output bias current vs. Output source current -50 VCC = 2 V Ta = +25C -40 -30 -20 -10 Output bias current vs. Output bias voltage 1.0 Output bias voltage VB (V) Output source current ISOURCE (mA) TYPICAL CHARACTERISTIC VCC = 2 V Ta = +25C 0.8 0.6 0.4 0.2 0 0 -100 -200 -300 -400 -500 -600 -700 0 -100 -200 -300 -400 -500 -600 -700 0 Output bias current IB (mA) Output bias current IB (mA) "L" Level output "H" Level output 2.0 VCC = 2 V RB = 820 Ta = +25C "H" Level output voltage VO (V) "L" Level output voltage VO (mV) 200 100 VCC = 2 V RB = 820 Ta = +25C 1.0 0.0 0 0 2 4 6 8 0 10 12 14 16 18 20 "L" Level output current IO (mA) -6 -12 -18 -24 "H" Level output current IO (mA) Timing resistor vs. Oscillator frequency Ambient temp. vs. Oscillator frequency 2M 210 500 k VCC = 3 V RB = 820 Ta = +25C 100 k CT = 100 pF 200 VCC = 2 V RB = 820 CT = 1000 pF RT = 3 k 190 180 170 160 Oscillator frequency fOSC (Hz) 1M Oscillator frequency fOSC (kHz) -30 50 k CT = 1000 pF 10 k 5k CT = 10000 pF 150 -30 -20 0 20 40 Ambient temp. Ta (C) 60 75 1k 1k 5 k 10 k 50 k 100 k Timing resistor RT () 500 k (Continued) 8 MB3776A (Continued) Control terminal voltage vs. Control terminal current VCC = 2 V Ta = +25C VCC = 7 V Ta = +25C -1.0 Control terminal current ICTL (mA) Control terminal current ICTL (mA) Control terminal voltage vs. Control terminal current -1.0 -0.5 0 -0.5 0 0.0 0.4 0.8 1.2 1.6 Control terminal voltage VCTL (V) 2.0 0 2 4 6 8 10 Control terminal voltage VCTL (V) Power supply voltage vs. Input on voltage 10 Ta = +25C Inpurt on current VCTL (V) 8 6 4 2 0 0 2 4 6 8 10 Power supply voltage VCC (V) 9 MB3776A APPLICATION EXAMPLE 18 k 10 H 10 H VIN (+3 V) VO+ (+5 V) + 4.7 F - 10 F 1 2 CTL + + - - + + - - 10 F 8 1000 pF 7 0.1 F 3 k 3 6 4 5 10 F 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 10 MB3776A NOTES ON USE * Take account of common impedance when designing the earth line on a printed wiring board. * Take measures against static electricity. - For semiconductors, use antistatic or conductive containers. - When storing or carrying a printed circuit board after chip mounting, put it in a conductive bag or container. - The work table, tools and measuring instruments must be grounded. - The worker must put on a grounding device containing 250 k to 1 M resistors in series. * Do not apply a negative voltage - Applying a negative voltage of -0.3 V or less to an LSI may generate a parasitic transistor, resulting in malfunction. ORDERING INFORMATION Part number Package MB3776A-P 8-pin Plastic DIP (DIP-8P-M01) MB3776APF 8-pin Plastic SOP (FPT-8P-M01) MB3776APNF 8-pin Plastic SOP (FPT-8P-M02) MB3776APFV 8-pin Plastic SSOP (FPT-8P-M03) Remarks 11 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 0.460.08 (.018.003) +0.30 0.99 -0 +.012 .039 -0 +0.35 0.89 -0.30 +.014 .035 -.012 C 1994 FUJITSU LIMITED D08006S-2C-3 +0.30 1.52 -0 +.012 .060 -0 7.62(.300) TYP 15MAX 2.54(.100) TYP Dimensions in mm (inches) . Note : The values in parentheses are reference values. (Continued) 12 MB3776A (Continued) Note 1) *1 : These dimensions include resin protrusion. Note 2) *2 : These dimensions do not include resin protrusion. Note 3) Pins width and pins thickness include plating thickness. Note 4) Pins width do not include tie bar cutting remainder. 8-pin Plastic SOP (FPT-8P-M01) +0.25 +.010 +0.03 *1 6.35 -0.20 .250 -.008 0.17 -0.04 +.001 8 .007 -.002 5 *2 5.300.30 7.800.40 (.209.012) (.307.016) INDEX Details of "A" part +0.25 2.00 -0.15 +.010 .079 -.006 1 1.27(.050) "A" 4 0.470.08 (.019.003) 0.13(.005) (Mounting height) 0.25(.010) 0~8 M 0.500.20 (.020.008) 0.600.15 (.024.006) +0.10 0.10 -0.05 +.004 .004 -.002 (Stand off) 0.10(.004) C 2002 FUJITSU LIMITED F08002S-c-6-7 Dimensions in mm (inches) . Note : The values in parentheses are reference values. (Continued) 13 MB3776A Note 1) *1 : These dimensions include resin protrusion. Note 2) *2 : These dimensions do not include resin protrusion. Note 3) Pins width and pins thickness include plating thickness. Note 4) Pins width do not include tie bar cutting remainder. 8-pin Plastic SOP (FPT-8P-M02) +0.25 +.010 +0.03 *1 5.05 -0.20 .199 -.008 0.22 -0.07 +.001 .009 -.003 8 5 *2 3.900.30 6.000.40 (.154.012) (.236.016) Details of "A" part 45 1.550.20 (Mounting height) (.061.008) 0.25(.010) 0.40(.016) 1 "A" 4 1.27(.050) 0.440.08 (.017.003) 0.13(.005) 0~8 M 0.500.20 (.020.008) 0.600.15 (.024.006) 0.150.10 (.006.004) (Stand off) 0.10(.004) C 2002 FUJITSU LIMITED F08004S-c-4-7 Dimensions in mm (inches) . Note : The values in parentheses are reference values. (Continued) 14 MB3776A (Continued) Note 1) *1 : These dimensions include resin protrusion. Note 2) *2 : These dimensions do not include resin protrusion. Note 3) Pins width and pins thickness include plating thickness. Note 4) Pins width do not include tie bar cutting remainder. 8-pin Plastic SSOP (FPT-8P-M03) +0.03 *1 3.500.10(.138.004) 0.17 -0.04 +.001 8 .007 -.002 5 *2 4.200.10 6.200.20 (.165.004) (.244.008) INDEX Details of "A" part +0.20 1.25 -0.10 +.008 .049 -.004 (Mounting height) 0.25(.010) 1 "A" 4 0.80(.031) 0.370.08 (.015.003) 0.10(.004) 0~8 M 0.500.20 (.020.008) 0.600.15 (.024.006) 0.100.10 (.004.004) (Stand off) 0.10(.004) C 2002 FUJITSU LIMITED F08005S-c-3-5 Dimensions in mm (inches) . Note : The values in parentheses are reference values. 15 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, such as descriptions of function and application circuit examples, in this document are presented solely for the purpose of reference to show examples of operations and uses of Fujitsu semiconductor device; Fujitsu does not warrant proper operation of the device with respect to use based on such information. When you develop equipment incorporating the device based on such information, you must assume any responsibility arising out of such use of the information. Fujitsu assumes no liability for any damages whatsoever arising out of the use of the information. Any information in this document, including descriptions of function and schematic diagrams, shall not be construed as license of the use or exercise of any intellectual property right, such as patent right or copyright, or any other right of Fujitsu or any third party or does Fujitsu warrant non-infringement of any third-party's intellectual property right or other right by using such information. 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