MAX1574ETB+T【PDF 1/9 页】IC LED DRVR WHITE BCKLGT 10TDFN

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ATION

EVALU

AVAILA

19-3117; Rev 0; 12/03

KIT

B LE

180mA, 1x/2x, White LED Charge Pump

in 3mm x 3mm TDFN

General Description

The MAX1574 charge pump drives up to three white

LEDs with regulated constant current for uniform intensity.

By utilizing adaptive 1x/2x charge-pump modes and

very-low-dropout current regulators, it achieves 180mA

output drive capability and high efficiency over the 1-cell

lithium-battery input voltage range. Fixed-frequency

(1MHz) switching allows for tiny external components,

and the regulation scheme is optimized to ensure low EMI

and low input ripple.

The MAX1574 uses an external resistor to set the full-

scale 100% LED current. An enable input (EN) is used for

simple on/off control or can be pulsed repeatedly to set

lower LED current in multiple steps down to 5%. Once the

desired brightness is set, the MAX1574 maintains con-

stant LED current as long as EN is kept high. If EN is kept

low for more than 2ms, the MAX1574 enters shutdown.

The MAX1574 is available in a 10-pin 3mm x 3mm TDFN

package (0.8mm max height).

Applications

Features

? Up to 180mA (60mA/LED) Drive Capability

? 83% Average Efficiency (P LED / P BATT ) Over Li+

Battery Discharge

? 0.5% (typ) LED Current Matching

? Adaptive 1x/2x Mode Switchover

? Low Input Ripple and EMI

? 5% to 100% Dimming Through Single-Wire Serial

Pulse Interface

? Low 0.1μA Shutdown Current

? 2.7V to 5.5V Supply Voltage Range

? Soft-Start Limits Inrush Current

? Output Overvoltage Protection

? Thermal-Shutdown Protection

? 10-Pin 3mm x 3mm TDFN Package

Ordering Information

LCD Backlighting

Camera Strobes/Flashes and Movie Lights

Cell Phones/Smart Phones

PDAs, Digital Cameras, and Camcorders

PART

MAX1574ETB

TEMP RANGE

-40°C to +85°C

PIN-

PACKAGE

10 TDFN

3mm x 3mm

TOP

MARK

ABB

Typical Operating Circuit

0.22 μ F

TOP VIEW

Pin Configuration

2.7V TO 5.5V

UP TO 180mA

1 μ F

GND

MAX1574

OUT

1 μ F

LED1

MAX1574

ON/OFF AND

DIMMING

LED2

SET

LED3

TDFN

3mm × 3mm

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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