MB3888 Datasheet | Fuji Electric

DESCRIPTION The MB3888 is a DC/DC converter IC suitable for down-conversion, using pulse-width (PWM) charging and enabling output voltage to be set to any desired level from one cell to four cells. The MB3888 provides a broad power supply voltage range and low standby current as well as high efficiency, making it ideal for use as a built-in charging device in products such as notebook PC. This product is covered by US Patent Number 6,147,477. s FEATURES - - - - - Output voltage setting using external resistor : 1 cell to 4 cells High efficiency : 96% (VIN = 19 V, Vo = 16.8 V) Wide range of operating supply voltages : 8 V to 25 V Output voltage setting accuracy : 5 V ± 0.74% (Ta = - 10 °C to 85 °C) Charging current accuracy : ±5% (Continued) s PACKAGE 20-pin plastic SSOP (FPT-20P-M03) (Continued) - Built-in frequency setting capacitor enables frequency setting using external resistor only - Oscillation frequency range : 100 k Hz to 500 k Hz - Built-in current detection amplifier with wide in-phase input voltage range : 0 V to VCC - In standby mode, leave output voltage setting resistor open to prevent inefficient current loss - Built-in standby current function : 0 µA (standard) - Built-in soft-start function independent of loads - Built-in totem-pole output stage supporting P-channel MOS FETs devices MB3888 s PIN ASSIGNMENT (TOP VIEW) GND : 1 RT : 2 CTL : 3 VREF : 4 DTC : 5 FB2 : 6 - INE2 : 7 +INE2 : 8 OUTD : 9 - INC : 10 20 : CS 19 : VCC (O) 18 : OUT 17 : VH 16 : VCC 15 : FB1 14 : - INE1 13 : +INE1 12 : OUTC 11 : +INC (FPT-20P-M03) MB3888 s PIN DESCRIPTION Pin No. 1 2 Symbol GND RT I/O   I O I O I I O I I O I I O  O O   Ground terminal. Triangular-wave oscillation frequency setting resistor connection terminal. Power supply control terminal. Setting the CTL terminal at “L” level places the IC in the standby mode. Reference voltage output terminal. PWM parator block (PWM) input terminal. pares the lowest voltage among terminals FB1, FB2, and...