DESCRIPTION

The device is a pwm controller for high performance dc-dc conversion from 3.3V, 5V and 12V buses.

The output voltage is adjustable down to 0.9V; higher voltages can be obtained with an external voltage divider.

High peak current gate drivers provide for fast switching to the external power section, and the output current can be in excess of 20A.

The device assures protections against load overcurrent and overvoltage. An internal crowbar is also provided turning on the low side mosfet as long as the over-voltage is detected. In case of over-current detection, the soft start capacitor is discharged and the system works in HICCUP mode.

FEATURES

■ OPERATING SUPPLY VOLTAGE FROM 5V TO 12V BUSES

■ UP TO 1.3A GATE CURRENT CAPABILITY

■ ADJUSTABLE OUTPUT VOLTAGE

■ N-INVERTING E/A INPUT AVAILABLE

■ 0.9V ±1.5 VOLTAGE REFERENCE

■ VOLTAGE MODE PWM CONTROL

■ VERY FAST LOAD TRANSIENT RESPONSE

■ 0 TO 100 DUTY CYCLE

■ POWER GOOD OUTPUT

■ OVERVOLTAGE PROTECTION

■ HICCUP OVERCURRENT PROTECTION

■ 200kHz INTERNAL OSCILLATOR

■ OSCILLATOR EXTERNALLY ADJUSTABLE FROM 50kHz TO 1MHz

■ SOFT START AND INHIBIT

■ PACKAGES: SO-16 & HTSSOP16

APPLICATIONS

■ SUPPLY FOR MEMORIES AND TERMINATIONS

■ COMPUTER ADD-ON CARDS

■ LOW VOLTAGE DISTRIBUTED DC-DC

■ MAG-AMP REPLACEMENT