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MC33997 - 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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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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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 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.