19-2662; Rev 0; 10/02
High-Efficiency, Triple-Output, Keep-Alive Power Supply for Notebook Computers
General Description
The MAX1534 is a high-efficiency, triple-output power supply for keep-alive (always on) voltage rails.
The 500mA buck
regulator with an internal current-limited 0.
5Ω PMOS steps down the battery or wall adapter supply rail to a fixed 5V or an adjustable output voltage.
Two integrated low-voltage linear
regulators follow this output and provide two independent preset output voltages of 3.
3V and 1.
8V, or adjustable output voltages.
The buck
regulator utilizes a peak current-limit, pulsefrequency modulation (PFM) architecture for highest light-load efficiency to conserve batt...