MAX1848 白光LED升压型转换器，SOT23封装

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The MAX1848 drives 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 that the LED currents are identical for uniform brightness. This configuration eliminates the need for ballast resistors and expensive factory calibration. Other benefits include greater simplicity, lower cost, higher efficiency, and greater reliability.

This step-up PWM converter includes an internal, high-voltage, low R_DSON N-channel MOSFET switch for high efficiency and maximum battery life. A single analog voltage Dual Mode™ input provides a simple means of brightness adjustment and on/off control. Fast 1.2MHz current-mode PWM control 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.

The MAX1848 is available in space-saving 8-pin thin QFN (3mm x 3mm) and 8-pin SOT23 packages.

关键特性

应用/使用

Constant Current Regulation for Uniform Illumination
High 87% Efficiency
Analog or Logic Control of LED Intensity
0.8W Output Power with Internal High-Voltage MOSFET Switch
Small, Low-Profile External Components
2.6V to 5.5V Input Range
13V Maximum Output with Overvoltage Protection
Optimized for Low Input Ripple
Programmable Soft-Start
0.3µA Shutdown Current
Small 8-pin Thin QFN (3mm x 3mm) and 8-Pin SOT23 Packages

	蜂窝电话/智能电话
	电子书与亚笔记本电脑
	PDA、掌上电脑与无线手持装置
	白色LED显示器背光

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

LED Temp. Derating

EV-Kit

RoHS Available

Package

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

Operating Temp. Range (°C)

Price^**

MAX1848

Inductor Based

Series

Analog

0.8

2.6

5.5

Yes

1200

Yes

SOT-23/8
THIN QFN (Dual)/8

-40 to +85

$1.23 @ 1k

See All White LED Drivers (41)

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.