MB3778

FUJITSU SEMICONDUCTOR DATA SHEET DS04-27203-6E ASSP Switching Regulator Controller MB3778 s DESCRIPTION The MB3778 is a dual switching regulator control IC. It has a two-channel basic circuit that controls PWM system switching regulator power. Complete synchronization is achieved by using the same oscillator output wave. This IC can accept any two of the following types of output voltage: step-down, step-up, or voltage inversion (inverting voltage can be output to only one circuit). The MB3778’s low power consumption makes it ideal for use in portable equipment. s FEATURES Wide input voltage range : 3.6 V to 18 V Low current consumption : 1.7 mA typ. operation, 10 µA max. stand-by Wide oscillation frequency range:1 kHz to 500 kHz Built-in timer latch short-circuit protection circuit Built-in under-voltage lockout circuit Built-in 2.46 V reference voltage circuit : 1.23 V output can be obtained from RT terminal Variable dead-time provides control over total range Built-in stand-by function: power on/off function s PACKAGES 16-pin, Plastic DIP 16-pin, Plastic SSOP v 16-pin, Plastic SOP (DIP-16P-M04) (FPT-16P-M05) (FPT-16P-M06) MB3778 s PIN ASSIGNMENT (TOP VIEW) CT RT +IN1 −IN1 FB1 DTC1 OUT1 E/GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VREF SCP CTL −IN2 FB2 DTC2 OUT2 VCC (DIP-16P-M04) (FPT-16P-M05) (FPT-16P-M06) 2 MB3778 s PIN DESCRIPTION No. 1 2 3 4 5 Pin CT RT +IN1 −IN1 FB1 Function Oscillator timing capacitor terminal (150 pF to 15,000 pF) . ...