AT9933 Series

Hysteretic Boost-Buck (CUK) LED Driver IC

Catalog

Hysteretic Boost-Buck (CUK) LED Driver IC

Part	Number of Outputs	Applications	Qualification	Grade	Voltage - Supply (Max) [Max]	Topology	Dimming	Mounting Type	Package / Case	Package / Case [y]	Package / Case [x]	Supplier Device Package	Internal Switch(s)	Operating Temperature [Min]	Operating Temperature [Max]	Type
Microchip Technology AT9933LG-GVAO	1	Lighting	AEC-Q100	Automotive	75 V	Step-Down (Buck) Step-Up (Boost)	PWM	Surface Mount	8-SOIC	3.9 mm	0.154 in	8-SOIC		-40 °C	125 °C	DC DC Controller
Microchip Technology AT9933LG-G	1		AEC-Q100	Automotive	75 V	Step-Down (Buck) Step-Up (Boost)	PWM	Surface Mount	8-SOIC	3.9 mm	0.154 in	8-SOIC		-40 °C	125 °C	DC DC Controller

Catalog

Hysteretic Boost-Buck (CUK) LED Driver IC

Key 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.