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AT9933
  • AT9933

AT9933

In Production

The AT9933 is a variable frequency PWM controller IC, designed to control an LED lamp driver using a low-noise boost-buck (Ćuk) topology. The AT9933 uses patent-pending hysteretic current-mode control to regulate both the input and the output currents. This enables superior input surge immunity without the necessity for complex loop compensation. Input current control enables current limiting during startup, input under-voltage and output overload conditions. The AT9933 provides a low-frequency PWM dimming input that can accept an external control signal with a duty cycle of 0 - 100% and a high dimming ratio. The AT9933 based LED driver is ideal for automotive LED lamps. The part is rated for up to 125°C ambient temperatures and is AEC-Q100 compliant. ...

Microchip Technology AT9933 Product Info

16 April 2026 0

Parameters

Topology

Boost-Buck (Cuk)

+Vin min (V)

9

+Vin max (V)

75

Output Current

External FET

Dimming

PWM

Package

SOIC-8

Features

    • Constant current LED Driver
    • Steps input voltage up or down
    • Low EMI
    • Variable frequency operation
    • Internal 75V linear regulator
    • Input and output current sensing
    • Input current limit
    • Enable & PWM dimming
    • Ambient temperature rating up to 125°C
    • Meets AEC-Q100 requirements

Description

The AT9933 is a variable frequency PWM controller IC, designed to control an LED lamp driver using a low-noise boost-buck (Ćuk) topology. The AT9933 uses patent-pending hysteretic current-mode control to regulate both the input and the output currents. This enables superior input surge immunity without the necessity for complex loop compensation. Input current control enables current limiting during startup, input under-voltage and output overload conditions. The AT9933 provides a low-frequency PWM dimming input that can accept an external control signal with a duty cycle of 0 - 100% and a high dimming ratio. The AT9933 based LED driver is ideal for automotive LED lamps. The part is rated for up to 125°C ambient temperatures and is AEC-Q100 compliant.

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