MAX1575 Maxim Integrated Products, MAX1575 Datasheet

MAX1575

Manufacturer Part Number

MAX1575

Description

White LED 1x/1.5x Charge Pump

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX1575.pdf (9 pages)

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Quantity

Price

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Part Number:

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Part Number:

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Download datasheet (291Kb)

The MAX1575 charge pump drives up to four white

LEDs in the main display and up to two white LEDs in

the sub-display with regulated constant current for uni-

form intensity. By utilizing adaptive 1x/1.5x charge-

pump modes and very-low-dropout current regulators,

it achieves high efficiency over the full 1-cell lithium-

battery input voltage range. A 1MHz fixed-frequency

switching allows for tiny external components, and the

regulation scheme is optimized to ensure low EMI and

low input ripple.

The MAX1575 uses an external resistor to set the full-

scale 100% LED current. Two enable inputs, ENM and

ENS, are used for simple on/off controls for the main and

sub-displays, respectively. By repeatedly pulsing either

enable input, the LEDs can be dimmed in multiple steps

down to 5%. Once the desired brightness is set, the

MAX1575 maintains that brightness setting as long as

the enable input is kept high. If an enable input is kept

low for more than 2ms, the LED current for the respec-

tive display is set to zero. If both enable inputs are kept

low for more than 2ms, the MAX1575 enters shutdown.

The MAX1575 is available in a 16-pin 4mm x 4mm thin

QFN package (0.8mm max height).

19-3097; Rev 0; 12/03

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.

Cell Phones with Main and Sub-Displays

PDAs/Smart Phones with Up to Six White LEDs

TOP VIEW

C1N 13

C2N 15

C1P 16

IN 14

________________________________________________________________ Maxim Integrated Products

4mm x 4mm

THIN QFN

General Description

MAX1575

Pin Configuration

Applications

White LED 1x/1.5x Charge Pump

LED4

LED5

LED6

ENM

for Main and Sub-Displays

♦ Powers Main and Sub-Display LEDs

♦ 85% Average Efficiency (P

♦ 2% LED Current Matching

♦ Up to 30mA/LED Drive Capability

♦ Adaptive 1x/1.5x Mode Switchover

♦ Low Input Ripple and EMI

♦ Individual 5% to 100% Dimming Through

♦ Low 0.1µA Shutdown Current

♦ 2.7V to 5.5V Supply Voltage Range

♦ Soft-Start Limits Inrush Current

♦ Output-Overvoltage Protection

♦ Thermal-Shutdown Protection

♦ 16-Pin Thin QFN 4mm x 4mm Package

MAX1575ETE

Battery Discharge

Single-Wire Serial Pulse Interface

PART

2.7V TO 5.5V

AND DIMMING

ENABLE MAIN

ENABLE SUB

1µF

ON/OFF

SET

Typical Operating Circuit

-40°C to +85°C

TEMP RANGE

GND

ENM

ENS

SET

Ordering Information

C1P

C2P

MAX1575

1µF

C1N

LED

C2N

LED1

LED2

LED3

LED4

LED5

LED6

PIN-PACKAGE

16 Thin QFN 4mm x 4mm

OUT

www.DataSheet4U.com

/ P

BATT

Features

) Over Li+

1µF

MAIN

SUB

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