MAX1570 Maxim Integrated Products, MAX1570 Datasheet

MAX1570

Manufacturer Part Number

MAX1570

Description

White LED Current Regulator

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX1570.pdf (11 pages)

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Bonase Electronics (HK) Co., Limited

Part Number:

MAX1570ETE+

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Maxim Integrated Products

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Download datasheet (387Kb)

The MAX1570 fractional charge pump drives up to five

white LEDs with regulated constant current for uniform

intensity. The MAX1570 maintains the highest possible

efficiency over the full 1-cell lithium-ion (Li+) battery

input voltage range by utilizing a 1x/1.5x fractional

charge pump and very-low-dropout current regulators.

The MAX1570 operates with 1MHz fixed-frequency

switching, allowing for tiny external components. The

regulation scheme is optimized to ensure low EMI and

low input ripple.

An external resistor sets the full-scale LED current,

while two digital inputs control on/off and select

between three levels of brightness. A pulse-width mod-

ulation (PWM) signal can also be used to modulate LED

brightness.

The MAX1570 is available in 16-pin 4mm

QFN packaging (0.8mm max height).

19-2526; Rev 0; 7/02

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.

White LED Backlighting

Cell Phones and Smart Phones

PDA and Palmtop Computers

Portable MP3 Players

Digital Cameras and Camcorders

LED5

GND

C1P

EN2

White LED Current Regulator with 1x/1.5x

________________________________________________________________ Maxim Integrated Products

LED4 LED3 LED2 LED1

C2N OUT C2P IN

(4mm x 4mm)

General Description

MAX1570

THIN QFN

Pin Configuration

Applications

C1N

PGND

EN1

SET

High-Efficiency Charge Pump

4mm Thin

o Excellent 0.3% LED-to-LED Current Matching

o 30mA/LED Drive Capability

o Proprietary 1x/1.5x Modes for Ultra-High

o Low Input Ripple and EMI

o Eliminates Ballast Resistors

o Digital or PWM LED Dimming Control

o 0.1µA Shutdown Current

o 2.7V to 5.5V Supply Voltage Range

o Soft-Start Limits Inrush Current

o Thermal-Shutdown Protection

o No External Inductor, Schottky, or Zener Diode

o Tiny 16-Pin 4mm

MAX1570ETE

Efficiency

Required

DIMMING

2.7V TO 5.5V

ON/OFF

PART

R SET

AND

EN1

EN2

SET

1µF

Typical Operating Circuit

REGULATING CHARGE PUMP

REFERENCE

CONTROL

C1P

1µF

AND

-40°C to +85°C

TEMP RANGE

GND

Ordering Information

1x/1.5x

4mm Thin QFN Package

C1N C2P

MAX1570

LOW-DROPOUT

REGULATORS

1µF

CURRENT

PGND

C2N

www.DataSheet4U.com

OUT

LED1

LED2

LED3

LED4

LED5

PIN-PACKAGE

16 Thin QFN

4.7µF

Features

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