MAX1570 White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump

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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 modulation (PWM) signal can also be used to modulate LED brightness.

The MAX1570 is available in 16-pin 4mm x 4mm Thin QFN packaging (0.8mm max height).

Key Features Applications/Uses

Excellent 0.3% LED-to-LED Current Matching
30mA/LED Drive Capability
Proprietary 1x/1.5x Modes for Ultra-High Efficiency
Low Input Ripple and EMI
Eliminates Ballast Resistors
Digital or PWM LED Dimming Control
0.1µA Shutdown Current
2.7V to 5.5V Supply Voltage Range
Soft-Start Limits Inrush Current
Thermal-Shutdown Protection
No External Inductor, Schottky, or Zener Diode Required
Tiny 16-Pin 4mm x 4mm Thin QFN Package
Protected by U.S. Patent #6,538,394 B2

Cell Phones/Smartphones
Digital Cameras and Camcorders
PDAs and Palmtop Computers
Portable MP3 Players
White LED Backlighting

Key Specifications: White LED Drivers

Part Number

Topology

Max. No. of LEDs

Configuration

Dimming Control

P_OUT (W)

I_MAX per LED (mA)

Min. V_IN (V)

Max. V_IN (V)

I_CC (max) (mA)

Max. V_OUT (V)

Fixed Freq.

Operating Freq. (kHz)

Soft Start

Internal Power Switch(es)

Shutdown

Open LED Protection

Camera Flash

LED Temp. Derating

EV-Kit

RoHS Available

Package

Smallest Available Package (max w/pins) (mm²)

Operating Temp. Range (°C)

Price^**

MAX1570

Charge Pump

Parallel

Analog
PWM

0.7

2.7

5.5

3.5

Yes

1000

Yes

THIN QFN/16

-40 to +85

$1.90 @ 1k

See All White LED Drivers (43)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

MAX1570: Typical Operating Circuit
Typical Operating Circuit

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Document Ref.: 19-2526; Rev 1; 2005-07-01
This page last modified: 2007-07-16