MAX16821CATI+T【PDF 1/24 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

19-0881; Rev 2; 1/10

ATION

EVALU

AVAILA

KIT

BLE

High-Power Synchronous HBLED

Drivers with Rapid Current Pulsing

General Description

Features

The MAX16821A/MAX16821B/MAX16821C pulse-

width-modulation (PWM) LED driver controllers provide

high output-current capability in a compact package

with a minimum number of external components. The

MAX16821A/MAX16821B/MAX16821C are suitable for

use in synchronous and nonsynchronous step-down

(buck), boost, buck-boost, SEPIC, and Cuk LED drivers. A

logic input (MODE) allows the devices to switch between

synchronous buck and boost modes of operation. These

devices are the first high-power drivers designed specifi-

cally to accommodate common-anode HBLEDs.

The ICs offer average current-mode control that enable

the use of MOSFETs with optimal charge and on-resis-

tance figure of merit, thus minimizing the need for

external heatsinking even when delivering up to 30A of

LED current.

The differential sensing scheme provides accurate con-

trol of the LED current. The ICs operate from a 4.75V to

5.5V supply range with the internal regulator disabled

(V CC connected to IN). These devices operate from a

7V to 28V input supply voltage with the internal regula-

tor enabled.

Up to 30A Output Current

True-Differential Remote Output Sensing

Average Current-Mode Control

4.75V to 5.5V or 7V to 28V Input-Voltage Range

0.1V/0.03V LED Current-Sense Options Maximize

Efficiency (MAX16821B/MAX16821C)

Thermal Shutdown

Nonlatching Output Overvoltage Protection

Low-Side Buck Mode with or without

Synchronous Rectification

High-Side Buck and Low-Side Boost Mode with or

without Synchronous Rectification

125kHz to 1.5MHz Programmable/Synchronizable

Switching Frequency

Integrated 4A Gate Drivers

Clock Output for 180° Out-of-Phase Operation for

Second Driver

-40°C to +125°C Operating Temperature Range

Ordering Information

The MAX16821A/MAX16821B/MAX16821C feature a

clock output with 180° phase delay to control a second

PART

TEMP RANGE

PIN-

PACKAGE

out-of-phase LED driver to reduce input and output fil-

ter capacitor size and to minimize ripple currents. The

wide switching frequency range (125kHz to 1.5MHz)

allows the use of small inductors and capacitors.

MAX16821A ATI+

MAX16821B ATI+

MAX16821C ATI+

-40°C to +125°C 28 TQFN-EP*

Additional features include programmable overvoltage

protection and an output enable function.

Applications

Front Projectors/Rear Projection TVs

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

Simplified Diagram

7V TO 28V

Portable and Pocket Projectors

Automotive Exterior Lighting

LCD TVs and Display Backlight

I.C.

V LED

Automotive Emergency Lighting and Signage

MAX16821

HIGH-FREQUENCY

OVI

CLP

CSP

PGND

Typical Operating Circuit and Selector Guide appear at end

of data sheet.

PULSE TRAIN

________________________________________________________________ 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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