CP6238

CP6238 BOOST CONVERT CONTROL IC GENERAL DESCRIPTION The CP6238 is a boost topology switching regulator control IC for battery-used applications field. The CP6238 includes a totem-pole single output stage for driving NPN transistor or N-MOS, high precision reference (0.5V) for comparing output voltage with feedback amplifier, an internal dead-time control for controlling the minimum duty cycle, programmable soft start with short circuit protection function and logic level control for operating mode or standby mode. FEATURES Wide supply voltage operating range: 1.8 to 15V Reference voltage precision: 2% Low current consumption: Operation Mode 5.5mA Standby-by Mode 1µA High speed oscillator frequency: 1MHz max. Programmable Soft Start function (SS) Short Circuit Protection function(SCP) Totem-pole output with adjustable on/off current (for NPN transistors or n-channel MOSFET) Logic level control stand-by mode function Package: SOP8/TSSOP8 SOP8 TYPICAL APPLICATION Digital Camera PDA Portable Equipment FUNCTIONAL BLOCK DIAGRAM 37 CP6238 Reference voltage supply 1.25V 0.8V 0.1V 1 36k Error Amp. 0.5V 500K 8 Sawtooth wave oscillator 0.1V PWM Comp. DTC 0.6V Output drive control circuit 0.22V Soft start & SCP circuit 62 4 5 30k MARK VIEW CP6238 PIN DESCRIPTION Name No. FB 1 SCP 2 VCC BR/CTL OUT GND 3 4 5 6 OSC 7 COMP 8 I/O Description I Error amplifier inverting input pin I Connected a capacitor Soft start and SCP function pin P IC power supply I Outpu...