MAX16812ATI/V+【PDF 1/21 页】IC LED DRIVR HIGH BRIGHT 28-TQFN

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Sheet目录340

[1页]2页 3页 4页 5页

19-0880; Rev 0; 7/07

ATION

EVALU

AVAILA

KIT

BLE

Integrated High-Voltage LED Driver

with Analog and PWM Dimming Control

General Description

Features

The MAX16812 is a peak-current-mode LED driver with

an integrated 0.2 ? power MOSFET designed to control

the current in a single string of high-brightness LEDs

(HB LEDs). The MAX16812 can be used in multiple

converter topologies such as buck, boost, or buck-

boost. The MAX16812 operates over a 5.5V to 76V wide

supply voltage range.

The MAX16812 features a low-frequency, wide-range

brightness adjustment (100:1), analog and PWM dim-

ming control input, as well as a resistor-programmable

EMI suppression circuitry to control the rise and fall

times of the internal switching MOSFET. A high-side

LED current-sense amplifier and a dimming MOSFET

driver are also included, simplifying the design and

reducing the total component count.

The MAX16812 uses peak-current-mode control,

adjustable slope compensation that allows for addition-

al design flexibility. The device has two current regula-

tion loops. The first loop controls the internal switching

MOSFET peak current, while the second current regula-

Integrated 76V, 0.2 ? (typ) Power MOSFET

5.5V to 76V Wide Input Range

Adjustable LED Current with 5% Accuracy

Floating Differential LED Current-Sense Amplifier

Floating Dimming N-Channel MOSFET Driver

PWM LED Dimming with:

PWM Control Signal

Analog Control Signal

Chopped V IN Input

Peak-Current-Mode Control

125kHz to 500kHz Adjustable Switching Frequency

Adjustable UVLO and Soft-Start

Output Overvoltage Protection

5 μ s LED Current Rise/Fall Times During Dimming

Minimize EMI

Overtemperature and Short-Circuit Protection

Ordering Information

tion loop controls the LED current. Switching frequency

can be adjusted from 125kHz to 500kHz.

Additional features include adjustable UVLO, soft-start,

external enable/disable input, thermal shutdown, a

PART

MAX16812ATI+

TEMP RANGE

-40°C to +125°C

PIN- PKG

PACKAGE CODE

28 TQFN-EP* T2855-8

1.238V 1% accurate buffered reference, and an on-

chip oscillator. An internal 5.2V linear regulator supplies

up to 20mA to power external devices.

The MAX16812 is available in a thermally enhanced

5mm x 5mm, 28-pin TQFN-EP package and is specified

over the automotive -40°C to +125°C temperature range.

+Denotes a lead-free package.

*EP = Exposed pad.

Simplified Diagram

C H_REG

Automotive Lighting:

Applications

R CS

DOUT

VOUT

C OUT

DRL, Fog Lights

Rear Combination Lights

Front and Rear Signal Lights

Interior Lighting

V IN

C IN

SRC

R SRC

Warning and Emergency Lighting

Architectural and Industrial Lighting

R TGRM

MAX16812

DRV

SLP

L_REG

TGRM

C SLP

C TGRM

VOUT

DIM

R OV1

COMP

C COMP1

Typical Application Circuit and Pin Configuration appear at

end of data sheet.

R OV2

R COMP1

BUCK-BOOST CONFIGURATION

R COMP2

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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