MAX1831EEE+T 开关稳压器

MAX1831EEE+T

开关稳压器 3A, 1MHz, Low-Voltage, 

Step-Down Regulators with Synchronous Rectification and Internal Switches

General Description MAX1831EEE+T

The MAX1830/MAX1831 constant-off-time, pulse-widthmodulated (PWM) step-down DC-DC converters are ideal for use in 5V and 3.3V to low-voltage conversion necessary in notebook and subnotebook computers. These devices feature internal synchronous rectification for high efficiency and reduced component count. They require no external Schottky diode.

Features MAX1831EEE+T

♦ ±1.5% Output Accuracy

♦ 94% Efficiency

♦ Internal PMOS/NMOS Switches

45mΩ/55mΩ On-Resistance at VIN = +4.5V

50mΩ/55mΩ On-Resistance at VIN = +3V

♦ Output Voltages

+3.3V, +2.5V, or +1.5V Pin Selectable (MAX1831)

+2.5V, +1.8V, or +1.5V Pin Selectable (MAX1830)

+1.1V to VIN Adjustable (Both Devices)

♦ +3V to +5.5V Input Voltage Range

♦ 750μA (max) Operating Supply Current

♦ <1μA Shutdown Supply Current

♦ Programmable Constant-Off-Time Operation

Applications MAX1831EEE+T

5V or 3.3V to Low-Voltage Conversion

CPU I/O Supplies

Chipset Supplies

Notebook and Subnotebook Computers