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AT9919

Hysteretic, Buck, High Brightness LED Driver w/ High-Side Current Sensing

Status: In Production

Features:

  • Hysteretic control with high-side current sensing
  • Wide input voltage range: 4.5 to 40V
  • >90% Efficiency
  • Typical ±5% LED current accuracy
  • Up to 2.0MHz switching frequency
  • Adjustable constant LED current
  • Analog or PWM control signal for PWM dimming
  • Over-temperature protection
  • -40ºC to +125ºC operating temperature range
  • AEC-Q100 compliant
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Overview
Documents
Development Environment
Similar Devices
RoHS Information
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Device Overview

Summary

The AT9919 is a PWM controller IC designed to drive high brightness LEDs using a buck topology. It operates from an input voltage of 4.5 to 40VDC and employs hysteretic control with a high-side current sense resistor to set the constant output current. The operating frequency range can be set by selecting the proper inductor. Operation at high switching frequency is possible since the hysteretic control maintains accuracy even at high frequencies. This permits the use of small inductors and capacitors minimizing space and cost in the overall system. LED brightness control is achieved with PWM dimming from an analog or PWM input signal. Unique PWM circuitry allows true constant color with a high dimming range. The dimming frequency is programmed using a single external capacitor. The AT9919 comes in a small, 8-Lead DFN package and is qualified for automotive LED lighting applications.

Additional Features
    • Hysteretic control with high-side current sensing
    • Wide input voltage range: 4.5 to 40V
    • >90% Efficiency
    • Typical ±5% LED current accuracy
    • Up to 2.0MHz switching frequency
    • Adjustable constant LED current
    • Analog or PWM control signal for PWM dimming
    • Over-temperature protection
    • -40ºC to +125ºC operating temperature range
    • AEC-Q100 compliant
Parametrics
Name
Value
Topology
Buck
+Vin min (V)
4.5
+Vin max (V)
40
Output Current
External FET
Dimming
PWM
Package
DFN-8

Documents

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Data Sheets

  
704KB

Software Library

User Guides

Development Environment

  • Demo & Evaluation Boards
  • Software Libraries
Demo & Evaluation Boards
AT9919DB1 Demo Board
AT9919DB1 Demo Board ( AT9919DB1 )

The AT9919BDB1 demoboard is a high current LED driver designed to drive one LED at 1.0A from a 9.0 - 16VDC input. The demoboard uses an AT9919 hysteretic buck LED driver IC. The AT9919DB1 includes two PWM dimming modes. The analog control of the PWM dimming mode allows the user to dim the LED using a 0 - 2.0V analog signal applied between the ADIM and GND pins (0V gives 0% and 2.0V gives 100%). In...

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Software Libraries
Analog Simulation - AT9919

The MCP1792/3 family devices are high voltage, low dropout (LDO) regulators, capable of generating 100 mA output current. The input voltage range of 4.5V to 55V makes it ideal in 12V to 48V power

...

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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
AT9919K7-G
0.020780
0.118788
8
WDFN
3x3x0.8mm
Matte Tin
e3
AT9919K7-GVAO
0.020780
0.118788
8
WDFN
3x3x0.8mm
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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