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MB3825A Dataheets PDF



Part Number MB3825A
Manufacturers Fujitsu Media Devices
Logo Fujitsu Media Devices
Description 6-ch DC/DC Converter
Datasheet MB3825A DatasheetMB3825A Datasheet (PDF)

FUJITSU SEMICONDUCTOR DATA SHEET DS04-27220-2E ASSP For Power Supply Applications 6-ch DC/DC Converter IC With Synchronous Rectifier MB3825A s DESCRIPTION The MB3825A is a pulse width modulation (PWM) type 6-channel DC/DC converter IC with synchronous rectification (2-channels) designed for low voltage, high efficiency operation in high precision and high frequency applications, ideal for down conversion. The MB3825A is an ideal device offering low power consumption, compact size and light w.

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FUJITSU SEMICONDUCTOR DATA SHEET DS04-27220-2E ASSP For Power Supply Applications 6-ch DC/DC Converter IC With Synchronous Rectifier MB3825A s DESCRIPTION The MB3825A is a pulse width modulation (PWM) type 6-channel DC/DC converter IC with synchronous rectification (2-channels) designed for low voltage, high efficiency operation in high precision and high frequency applications, ideal for down conversion. The MB3825A is an ideal device offering low power consumption, compact size and light weight for products such as self-contained camcorders and digital still cameras. s FEATURES • • • • • • • Synchronous rectification (channels 1 and 4) High efficiency drive with power-on output enhanced by built-in speed-up circuit Wide range of operating power supply voltage : 2.5 V to 12 V Built-in high-precision reference voltage generator : 1.5 V±1% Wide operating oscillator frequency range, high frequency capability : 50 kHz to 800 kHz Wide input voltage range (all channels) : 0 V to Vcc - 0.9 V Error amplifier output for soft start (channels 1, 2, 4) (All channels may be set for same soft start time regardless of duty factor setting.) s PACKAGE 64-pin, Plastic LQFP (FPT-64P-M03) MB3825A s PIN ASSIGNMENT GND (O) 4, 5, 6 VCC (O) 4, 5, 6 GND (O) 1, 2, 3 VCC (O) 2 OUT2-4 OUT1-4 OUT1-3 OUT1-5 OUT1-2 50 CB1-4 CB2-4 CB2-3 CB1-3 64 63 62 61 60 59 58 57 56 55 54 53 52 51 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 CB2-2 VB4 VB3 CB2-5 CB1-5 VB5 OUT1-6 CB2-6 CB1-6 VB6 OVP5, 6 IN (C) 6 +IN (E) 6 −IN (E) 6 FB6 SCP IN (C) 5 +IN (E) 5 −IN (E) 5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 CB1-2 VB2 OUT1-1 CB2-1 CB1-1 OUT2-1 VCC (O) 1, 3 VB1 IN (C) 1 −IN (E) 1 FB1 IN (C) 2 −IN (E) 2 FB2 IN (C) 3 −IN (E) 3 CSCP CS IN (C) 4 −IN (E) 4 GND1 GND2 VREF FB5 FB4 RT CT VCC CTL2 CTL1 DTC3 2 FB3 MB3825A s PIN DESCRIPTION Pin No. 38 39 40 CH 1 46 43 44 45 41 35 36 37 CH 2 50 48 49 47 32 33 34 CH 3 56 54 55 52 31 20 19 18 CH 4 57 60 59 58 62 Symbol FB1 –IN(E)1 IN(C)1 OUT1-1 OUT2-1 CB1-1 CB2-1 VB1 FB2 –IN(E)2 IN(C)2 OUT1-2 CB1-2 CB2-2 VB2 FB3 –IN(E)3 IN(C)3 OUT1-3 CB1-3 CB2-3 VB3 DTC3 FB4 –IN(E)4 IN(C)4 OUT1-4 OUT2-4 CB1-4 CB2-4 VB4 I/O O I I O O — — — O I I O — — — O I I O — — — I O I I O O — — — Descriptions Channel 1 error amplifier output pin. Channel 1 error amplifier inverted input pin. Channel 1 short detection comparator input pin. Channel 1 main side output pin. Channel 1 synchronous rectifier side output pin. Channel 1 boot capacitor connection pin. Channel 1 output sink current setting pin. Channel 2 error amplifier output pin. Channel 2 error amplifier inverted input pin. Channel 2 short detection comparator input pin. Channel 2 output pin. Channel 2 boot capacitor connection pin. Channel 2 output sink current setting pin. Channel 3 error amplifier output pin. Channel 3 error amplifier inverted input pin. Channel 3 short detection comparator input pin. Channel 3 output pin. Channel 3 boot capacitor connection pin. Channel 3 output sink current setting pin. Channel 3 dead time control pin. Channel 4 error amplifier output pin. Channel 4 error amplifier inverted input pin. Channel 4 short detection comparator input pin. Channel 4 main side output pin. Channel 4 synchronous rectifier side output pin. Channel 4 boot capacitor connection pin. Channel 4 output sink current setting pin. (Continued) 3 MB3825A (Continued) Pin No. 17 16 15 14 CH 5 64 2 1 3 8 12 11 10 9 CH 6 4 6 5 7 8 Triangular-Wave Oscillator Circuit 21 Symbol FB5 –IN(E)5 +IN(E)5 IN(C)5 OUT1-5 CB1-5 CB2-5 VB5 OVP5,6 FB6 –IN(E)6 +IN(E)6 IN(C)6 OUT1-6 CB1-6 CB2-6 VB6 OVP5,6 RT I/O O I I I O — — — I O I I I O — — — I — Descriptions Channel 5 error amplifier output pin. Channel 5 error amplifier inverted input pin. Channel 5 error amplifier non-inverted input pin. Channel 5 short detection comparator input pin. Channel 5 output pin. Channel 5 boot capacitor connection pin. Channel 5 output sink current setting pin. Channel 5, 6 output maximum voltage setting pin. Channel 6 error amplifier output pin. Channel 6 error amplifier inverted input pin. Channel 6 error amplifier non-inverted input pin. Channel 6 short detection comparator input pin. Channel 6 output pin. Channel 6 boot capacitor connection pin. Channel 6 output sink current setting pin. Channel 5, 6 output maximum voltage setting pin. Triangular wave frequency setting resistor connection pin. 22 CT — Triangular wave frequency setting capacitor connection pin. Power supply control circuit. “H” level: Power supply operating mode “L” level: Standby mode Channel 3 control circuit. When CTL1 pin is “H” level “H” level: Channel 3 in operating mode “L” level: Channel 3 in OFF mode Short detection comparator input pin. Short protection circuit capacitor connection pin. Soft start circuit capacitor connection pin. 30 CTL1 I Control Circuit 29 13 23 26 CTL2 SCP CSCP CS I I — — (Continued) 4 MB3825A (Cont.


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