MAX1561, MAX1599 High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs

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The MAX1561/MAX1599 step-up converters drive up to six white LEDs with a constant current to provide backlight in cell phones, PDAs, and other hand-held devices. The step-up converter topology allows series connection of the white LEDs so the LED currents are identical for uniform brightness. This configuration eliminates the need for ballast resistors and expensive factory calibration.

The MAX1561/MAX1599 include an internal, high-voltage, low-R_DS(ON) N-channel MOSFET switch for high efficiency and maximum battery life. A single Dual Mode™ input provides a simple means of brightness adjustment and on/off control. Fast 1MHz (500kHz for the MAX1599) current-mode, pulse-width modulated (PWM) operation allows for small input and output capacitors and a small inductor while minimizing ripple on the input supply/battery. Programmable soft-start eliminates inrush current during startup.

Both devices are available in a space-saving, 8-pin 3mm x 3mm thin DFN package with exposed paddle (EP).

Key Features

Applications/Uses

Accurate Current Regulation for Uniform Illumination
High Efficiency Up to 87%
Flexible Analog or PWM Dimming Control
Up to 900mW Output Power with Internal 30V MOSFET Switch
Fast 1MHz (MAX1561) or 500kHz (MAX1599) PWM Operation
Small, Low-Profile External Components
2.6V to 5.5V Input Range
26V (max) Output with Overvoltage Protection
Optimized for Low 15mV_P-P Input Ripple
Soft-Start with Zero Inrush Current
0.3µA Shutdown Current
Tiny 8-Pin 3mm x 3mm Thin DFN Package

	Cell Phones/Smartphones
	e-Books and Subnotebooks
	PDAs, Palmtops, and Wireless Handhelds
	White LED Display Backlighting

Key Specifications: White LED Drivers

Part Number

Topology

Max. No. of LEDs

Configuration

Dimming Control

V_{CURR_SENSE} (mV)

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^**

MAX1561

Inductor Based

Series

Analog
PWM

100

0.9

2.6

5.5

0.55

Yes

1000

Yes

THIN QFN (Dual)/8

-40 to +85

$1.30 @ 1k

MAX1599

500

$1.30 @ 1k

See All White LED Drivers (42)

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.