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AT9917

Automotive LED Driver IC w/ High Current Accuracy

Status: In Production

Features:

  • Switch mode controller for boost, SEPIC & buck converters
  • Closed loop control of output current
  • High PWM dimming ratio
  • Internal 40V linear regulator
  • Internal 3% voltage reference
  • Constant frequency operation with programmable slope compensation
  • Linear and PWM dimming
  • Programmable jitter to reduce EMI
  • +/-1.0A MOSFET gate driver
  • Output short circuit protection
  • Output over voltage protection
  • Programmable hiccup timer
  • Temperature fold-back with external NTC resistor
  • Soft start
  • Meets AEC-Q100 requirements
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Overview
Documents
Development Environment
Similar Devices
RoHS Information
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Device Overview

Summary

The AT9917 is an advanced fixed frequency PWM IC designed to control single-switch, boost, SEPIC, and buck LED drivers in a constant current mode. The controller uses a peak current-mode control scheme (with programmable slope compensation) and includes an internal transconductance amplifier to control the output current with high accuracy. The IC includes a +/-1A gate driver that makes the AT9917 suitable for high power applications. An internal 40V linear regulator powers the IC eliminating the need for a separate power supply for the IC. The IC provides a FAULT output, which can be used to disconnect the LEDs in case of a fault condition (such as an alternator load dump in automobiles) using an external disconnect FET. AT9917 also provides a TTL compatible, low-frequency PWM dimming input that can accept an external control signal with a duty ratio of 0-100% and a frequency of up to several kilohertz. Temperature foldback of the output current is possible, using an external NTC resistor. The AT9917-based LED driver is suited for automotive LED driver applications. The AT9917 based LED lamp drivers can achieve efficiencies in excess of 90% when buck or boost topologies are used.

Additional Features
  • Switch mode controller for boost, SEPIC & buck converters
  • Closed loop control of output current
  • High PWM dimming ratio
  • Internal 40V linear regulator
  • Internal 3% voltage reference
  • Constant frequency operation with programmable slope compensation
  • Linear and PWM dimming
  • Programmable jitter to reduce EMI
  • +/-1.0A MOSFET gate driver
  • Output short circuit protection
  • Output over voltage protection
  • Programmable hiccup timer
  • Temperature fold-back with external NTC resistor
  • Soft start
  • Meets AEC-Q100 requirements
Parametrics
Name
Value
Topology
Boost, SEPIC
+Vin min (V)
5.3
+Vin max (V)
40
Output Current
External FET
Dimming
PWM / Linear
Package
TSSOP-24

Documents

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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
AT9917TS-G
0.073500
0.212400
24
TSSOP
4.4mm
Matte Tin
e3
AT9917TS-GVAO
0.073500
0.212400
24
TSSOP
4.4mm
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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