Description
19-2297; Rev 0; 1/02 Dual, 180° Out-of-Phase, 1.4MHz, 750mA StepDown Regulator with POR and RSI/PFO General .
The MAX1970/MAX1971/MAX1972 dual-output currentmode PWM buck regulators operate from 2.
Features
* o Current-Mode, 1.4MHz Fixed-Frequency PWM Operation o 180° Out-of-Phase Operation Reduces Input Capacitor o ±1% Output Accuracy Over Load, Line, and Temperature Ranges o 750mA Guaranteed Output Current o 2.6V to 5.5V Input o Power-On Reset Delay of 16.6ms (MAX1970) or 175ms (MAX1971 and MAX1972) o
Applications
* xDSL Modems xDSL Routers Copper Gigabit SFP and GBIC Modules USB-Powered Devices Dual LDO Replacement
Typical Operating Circuit
VIN 2.6V TO 5.5V
Pin Configuration
TOP VIEW
RSI EN
RSI EN
IN
VCC
POR POR LX1 OUT1 1.8V 750mA
LX1 1 VCC 2 COMP1 3 FB1 4
16 PGND 15 LX2 14 IN
MAX1971 COMP1 COMP2 VC