MT7285 datasheet(1/1 Pages) MAXIC

Teilenummer	MT7285

Bauteilbeschribung	Boost/Buck-Boost/Buck White LED Driver With High Frequency PWM Dimming

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Hersteller	MAXIC [Maxic Technology Corporation]

Direct Link	http://www.maxictech.com/

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MT7285

Boost/Buck-Boost/Buck White LED Driver

Maximizing IC Performance

With High Frequency PWM Dimming

Email: sales@maxictech.com

www.maxictech.com

Rev. 1.20

Tel: 86-10-62662828

Page 1

DESCRIPTION

The MT7285 is a constant current white LED

driver designed for wide input voltage range

from 4.2V to 40V system rail. The MT7285 can

be configured as Buck, Boost and Buck-Boost

topology. The MT7285 drives up to 20W

with AC12V/DC12V input voltage. Current

mode and fixed frequency operation provides

fast

transient

response

and

eases

loop

stabilization. With a current sense amplifier

threshold of 205mV, the LED current is

programmable with one external current sense

resistor and the power loss is minimized. The

450kHz

operating

frequency

minimizes

external inductor, input and output capacitor.

The MT7285 supports both PWM and analog

dimming

by

a

single

control

pin.

Fault

condition protection includes over voltage

protection (OVP), cycle-by-cycle peak current

limiting and thermal shutdown.

The MT7285 is available in ESOP8 packages.

FEATURES



4.2V to 40V input/output voltage range



High efficiency up to 95%



Cycle by Cycle Over Current Protection



External MOSFET driver



Support Boost ,Buck-Boost ,Buck topology



LED temperature protection



Stable with Low ESR Ceramic Capacitor



OTP and OVP protection



External setting over voltage protection



Fixed switching frequency: 450kHz



Frequency jittering for reduced EMI



Low feedback voltage: 205mV



Adjustable soft-start



Support one pin analog dimming and up to

10kHz PWM dimming



Available in ESOP8 package

APPLICATION



Automotive and Marine Lighting



High Power LED Driver



Torch Driver



Low Voltage LED Lighting

(Landscape, Desk, Room, MR16 lighting)



LED backlighting

TYPICAL APPLICATION (STEP-UP/BOOST APPLICATION)

R1

GND

VDD

ISEN

ADJ

COMP

OVP

CS

DRV

MT7285

VIN

VBAT

C1

Cdd

Ccomp

C2

RB1

RB2

Rcs

22nF

Rsen

9

5

6

8

1

2

3

4

7

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