General Description
The MAX1630–MAX1635 are buck-topology, step-down, switch-mode, power-supply controllers that generate
logic-supply voltages in battery-powered systems. These high-performance, dual/triple-output devices include on
board power-up sequencing, power-good signaling with delay, digital soft-start, secondary winding control, low
dropout circuitry, internal frequency-compensation net works, and automatic bootstrapping.

FEATUREs
♦96% Efficiency
♦+4.2V to +30V Input Range
♦2.5V to 5.5V Dual Adjustable Outputs
♦Selectable 3.3V and 5V Fixed or Adjustable Outputs (Dual Mode™)
♦12V Linear Regulator
♦Adjustable Secondary Feedback
(MAX1631/MAX1634)
♦5V/50mA Linear Regulator Output
♦Precision 2.5V Reference Output
♦Programmable Power-Up Sequencing
♦Power-Good (RESET) Output
♦Output Overvoltage Protection
(MAX1630/MAX1631/MAX1632)
♦Output Undervoltage Shutdown
(MAX1630/MAX1631/MAX1632)
♦200kHz/300kHz Low-Noise, Fixed-Frequency Operation
♦Low-Dropout, 99% Duty-Factor Operation
♦2.5mW Typical Quiescent Power (+12V input, both SMPSs on)
♦4μA Typical Shutdown Current
♦28-Pin SSOP Package

APPLICATIONs
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
Desktop CPU Local DC-DC Converters