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33997 - Switching Power Supply

General Description

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.

Key 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.
  • Two 5.0 V @ 200 mA (typical) Sensor Supplies VREF Protected Against Short-to-Battery and Short-to-Ground with Retry Capability.
  • Undervoltage Shutdown on the VDDL, VDDH Outputs with Retry C.

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Other Datasheets by Freescale Semiconductor (now NXP Semiconductors)

Part Number Description
33990 Enhanced Class B Serial Transceiver
33993 Multiple Switch Detection Interface
33996 16-Output Switch
33999 16-Output Switch
33901 High-speed CAN Transceiver
33926 5.0A Throttle Control H-Bridge
33931 5.0A Throttle Control H-bridge
33932 5.0A Throttle Control H-Bridge
33970 Dual Gauge Driver
33972 Multiple Switch Detection Interface

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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www.DataSheet4U.com Freescale Semiconductor, Inc. Document order number: MC33997/D Rev 3.0, 03/2003 MOTOROLA SEMICONDUCTOR TECHNICAL DATA 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 linear regulator uses an external pass transistor to reduce the 33997 power dissipation. The 33997 also provides a 3.3 V linear standby regulator and two 5.0 V sensor supply outputs protected by internal low-resistance LDMOS transistors.