The MAX1842EEE+ from Maxim Integrated Products is a 1A/2.7A, 1MHz, step down regulator with synchronous rectification and internal switch in 16 pin QSOP package. The constant-off-time, PWM step down DC to DC converter is ideal for use in 5V and 3.3V to low voltage conversion. The internal 90mohm PMOS power switch and 70mohm NMOS synchronous-rectifier switch easily deliver continuous load currents up to 1A. The MAX1842 produce a preset 2.5V, 1.8V or 1.5V output voltage or an adjustable output from 1.1V to VIN. It uses a unique current-mode, constant-off-time, PWM control scheme which includes Idle Mode™ to maintain high efficiency during light-load operation. The programmable constant-off-time architecture sets switching frequencies up to 1MHz and designed for continuous output current of up to 1A. The MAX1842 has a higher current limit of 3.1A (min) and is intended for applications requiring an occasional burst of output current up to 2.7A.
±1% output accuracy
95% efficiency
600µA (max) operating supply current
<1µA shutdown supply current
Programmable constant-off-time operation
1MHz (max) switching frequency
Idle mode operation at light loads
Thermal shutdown, 100% duty cycle during low-dropout operation
Adjustable soft-start inrush current limiting
Output short-circuit protection, operating temperature range from -40°C to 85°C
5V or 3.3V to Low-Voltage Conversion; Chipset Supplies; CPU I/O Ring; Notebook and Subnotebook Computers
