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AT9933

Hysteretic Boost-Buck (CUK) LED Driver IC

Status: In Production

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
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Overview
Documents
Development Environment
Similar Devices
RoHS Information
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Device Overview

Summary

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.

Additional 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
Parametrics
Name
Value
Topology
Boost-Buck (Cuk)
+Vin min (V)
9
+Vin max (V)
75
Output Current
External FET
Dimming
PWM
Package
SOIC-8

Documents

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User Guides

Development Environment

  • Demo & Evaluation Boards
Demo & Evaluation Boards
AT9933DB1 Demo Board
AT9933DB1 Demo Board ( AT9933DB1 )

The AT9933DB1 is an LED driver capable of driving up to 7 1-watt LEDs in series from an automotive input of 9 - 16V DC. The demoboard uses AT9933 in a boost-buck topology. The converter operates at frequencies in excess of 300kHz and has excellent output current regulation over the input voltage range. It can also withstand transients up to 42V and operate down to 6V input. The converter is also...

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Similar Devices

Product
Topology
+Vin min (V)
+Vin max (V)
Price 5K
Boost, SEPIC
5.3
40
$1.42
Buck
4.5
40
$0.73
Boost-Buck (Cuk)
5.3
40
$1.57
Boost-Buck (Cuk)
9
75
$0.90
Buck
4.5
42
$0.82

RoHS Information

Part Number
Device Weight (g)
Shipping Weight (grams)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
AT9933LG-G
0.078000
0.230303
8
SOIC
.150In(3.90mm)
Matte Tin
e3
AT9933LG-GVAO
0.078000
0.230303
8
SOIC
.150In(3.90mm)
Matte Tin
e3
To see a complete listing of RoHS data for this device, please Click here
Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.

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