Datasheet > AT9919

AT9919

更新时间： 2024-09-15 14:54:51

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
16页	532K
描述
The AT9919 is a PWM controller IC designed to drive high brightness LEDs using a buck topology. It

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AT9919 数据手册

AT9919

Hysteretic Buck High-Brightness LED Driver with

High-Side Current Sensing

Features

General Description

• AEC-Q100 Qualified

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 VDC to 40 VDC

and employs hysteretic control with a high-side current

sense resistor to set the constant output current.

• Hysteretic Control with High-side Current Sensing

• Wide Input Voltage Range: 4.5V to 40V

• >90% Efficiency

• Typical ±5% LED Current Accuracy

• Up to 2 MHz Switching Frequency

• Adjustable Constant LED 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.

• Analog or Pulse-Width Modulation (PWM) Control

Signal for PWM Dimming

• Overtemperature Protection

• –40ºC to +125ºC Operating Temperature Range

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.

Applications

• LED Lighting Applications

• Automotive Applications

AT9919 comes in a small, 8-Lead WDFN package and

is qualified for LED lighting applications.

AT9919 passes the automotive AEC-Q100 reliability

testing.

Package Type

8-Lead WDFN

(Top View)

GATE

GND

VIN

GND

RAMP

ADIM

VDD

DIM

See Table 2-1 for pin information.



2016-2022 Microchip Technology Inc. and its subsidiaries

DS20005595B-page 1

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与AT9919相关器件

型号	品牌	获取价格	描述	数据表
AT9919K7-G	MICROCHIP	获取价格	LED DISPLAY DRIVER, PDSO8
AT99231-B7B-4F	FOXCONN	获取价格	Card Edge Connector, 184 Contact(s), 2 Row(s), Female, Straight, 0.05 inch Pitch, Press Fi
AT99231-B7B-4N	FOXCONN	获取价格	Card Edge Connector, 184 Contact(s), 2 Row(s), Female, Straight, 0.05 inch Pitch, Press Fi
AT99232-B7B-4F	FOXCONN	获取价格	Card Edge Connector, 184 Contact(s), 2 Row(s), Female, Straight, 0.05 inch Pitch, Press Fi
AT99232-B7B-4N	FOXCONN	获取价格	Card Edge Connector, 184 Contact(s), 2 Row(s), Female, Straight, 0.05 inch Pitch, Press Fi
AT99233-B7B-4F	FOXCONN	获取价格	Card Edge Connector, 184 Contact(s), 2 Row(s), Female, Straight, 0.05 inch Pitch, Press Fi
AT99233-B7B-4N	FOXCONN	获取价格	Card Edge Connector, 184 Contact(s), 2 Row(s), Female, Straight, 0.05 inch Pitch, Press Fi
AT99236-B7B-4F	FOXCONN	获取价格	Card Edge Connector, 184 Contact(s), 2 Row(s), Female, Straight, 0.05 inch Pitch, Press Fi
AT99236-B7B-4N	FOXCONN	获取价格	Card Edge Connector, 184 Contact(s), 2 Row(s), Female, Straight, 0.05 inch Pitch, Press Fi
AT99237-B7B-4F	FOXCONN	获取价格	Card Edge Connector, 184 Contact(s), 2 Row(s), Female, Straight, 0.05 inch Pitch, Press Fi