MC33997 Datasheet (Motorola) - Switching Power Supply

MC33997, Switching Power Supply

Pin 1 2 3 4 Pin Name VKAMOK KA_VPWR CRES VPWR Description Keep-Alive Output Monitoring.

This pin is an "open-drain" output that will be used with a discrete pull-up resistor to VKAM.

When the supply voltage to the 33997 is disconnected or lost, the VKAMOK signal goes low.

Keep Alive Power Supply Pin

Freescale Semiconductor, Inc.

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Document order number: MC33997/D Rev 3.0, 03/2003 Advance Information Switching Power Supply with Linear Regulators The 33997 is a medium-power, multi-output power supply integrated circuit that is capable of operating over a wide input voltage range, from 6.0 V up to 26.5 V with 40 V transient capability.

It incorporates a sensorless current mode control step-down switching controller regulating directly to 5.0 V.

The 3.3 V li

MC33997 Features

* Operating Voltage Range 6.0 V up to 26.5 V (40 V transient)

* Step-Down Switching Regulator Output VDDH = 5.0 V @ 1400 mA (total)

* Linear Regulator with External Pass Transistor VDDL = 3.3 V @ 400 mA

* Low-Power Standby Linear Regulator VKAM = 3.3 V @ 10 mA