RC4191 Datasheet | Fairchild Semiconductor

.fairchildsemi. RC4191/RC4192/RC4193 Micropower Switching Regulator Features - - - - - High efficiency - 85% typical Low quiescent current - 215 m A Adjustable output - 1.3V to 30V High switch current - 200 m A Bandgap reference - 1.31V - - - - - Accurate oscillator frequency - ±10% Remote shutdown capability Low battery detection circuitry Low ponent count 8-lead packages Description The RC4191/4192/4193 series of monolithic ICs are low power switch mode regulators intended for miniature power supply applications. These DC-to-DC converter ICs provide all of the active ponents needed to create supplies for micropower circuits. Contained internally are an oscillator, switch, reference, parator, and logic, plus a discharged battery detection circuit. These regulators can achieve up to 85% efficiency in most applications while operating over a wide supply voltage range, 2.2V to 30V, at a very low quiescent current drain of 215 m A. The standard application circuit requires just seven external ponents for step-up operation: an inductor, a steering diode, three resistors, a low value timing capacitor, and an electrolytic filter capacitor. The bination of simple application circuit, low supply current, and small package make the RC4193 adaptable to a wide range of miniature power supply applications. The RC4193 is most suited for single ended step-up (VOUT > VIN) circuits because the NPN internal switch transistor is referenced to ground. It is plemented by Fairchild Semiconductor's micropower switching regulator, the RC4391, which is dedicated to step-down (VOUT < VIN) and inverting VOUT = -VIN) applications. Between the two devices the ability to create all three basic switching regulator configurations is assured. Refer to the RC4391 data sheet for step-down and inverting applications. The RC4191/92/93 series of micropower switching regulators consists of three devices, each with slightly different specifications. The RM4191 has a 1.5% maximum...