MAX1848

更新时间： 2024-10-01 22:57:59

品牌	Logo	应用领域
美信 - MAXIM		转换器
页数	文件大小	规格书
9页	324K
描述
White LED Step-Up Converter in SOT23

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数据手册

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MAX1848 数据手册

19-2028; Rev 1; 9/02

White LED Step-Up Converter in SOT23

General Description

Features

The MAX1848 drives white LEDs with a constant cur-

rent 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.

ꢀ 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

This step-up PWM converter includes an internal, high-

voltage, low R

N-channel MOSFET switch for high

DSON

efficiency and maximum battery life. A single analog

ꢀ 13V Maximum Output with Overvoltage Protection

ꢀ Optimized for Low Input Ripple

ꢀ Programmable Soft-Start

™

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.

ꢀ 0.3µA Shutdown Current

ꢀ Small 8-pin Thin QFN (3mm ✕ 3mm) and

The MAX1848 is available in space-saving 8-pin thin

QFN (3mm ✕ 3mm) and 8-pin SOT23 packages.

8-Pin SOT23 Packages

Ordering Information

Applications

TOP

MARK

Cell Phones and Smart Phones

PDAs, Palmtops, and Wireless Handhelds

e-Books and Subnotebooks

PART

TEMP RANGE PIN-PACKAGE

MAX1848EKA

MAX1848ETA

-40°C to +85°C 8 SOT23

AAIM

8 Thin QFN

(3mm 3mm)

-40°C to +85°C

ACR

White LED Display Backlighting

Note: Hand soldering is not recommended for the MAX1848

SOT23 package.

Pin Configuration

Typical Application Circuit

33µH

TOP VIEW

2.6V to 5.5V

3.3µF

COMP

CTRL

OUT

V+

COMP

CTRL

OUT

V+

OUT

MAX1848

OUT

1µF

GND

PGND

GND

PGND

MAX1848

PGND

GND

LOGIC

OR DAC

CTRL

SOT23

THIN QFN

3mm x 3mm

COMP

0.15µF

SENSE

5Ω

Dual Mode is a trademark of Maxim Integrated Products, Inc.

________________________________________________________________ Maxim Integrated Products

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.

12 3 4 5 6 7...9

中文翻译

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与MAX1848相关器件

型号	品牌	获取价格	描述	数据表
MAX1848EKA	MAXIM	获取价格	White LED Step-Up Converter in SOT23
MAX1848EKA-T	ROCHESTER	获取价格	0.85A SWITCHING REGULATOR, 1600kHz SWITCHING FREQ-MAX, PDSO8, MO-178, SOT-23, 8 PIN
MAX1848ETA	MAXIM	获取价格	White LED Step-Up Converter in SOT23
MAX1848ETA+	MAXIM	获取价格	Switching Regulator, Current-mode, 0.85A, 1600kHz Switching Freq-Max, 3 X 3 MM, 0.80 MM HE
MAX1848ETA+T	ROCHESTER	获取价格	0.85A SWITCHING REGULATOR, 1600kHz SWITCHING FREQ-MAX, QCC8, 3 X 3 MM, 0.80 MM HEIGHT, LEA
MAX1848ETA+T	MAXIM	获取价格	Switching Regulator, Current-mode, 0.85A, 1600kHz Switching Freq-Max, 3 X 3 MM, 0.80 MM HE
MAX1848ETA-T	MAXIM	获取价格	暂无描述
MAX1848EVKIT	MAXIM	获取价格	Dual.10-Bit.40MHz Current/Voltage Output DACs with Alternate Phase Update[MAX5182/MAX5185/
MAX184ACNG	MAXIM	获取价格	High-Speed 12-Bit A/D Converters With External Refernce input
MAX184ACNG+	MAXIM	获取价格	ADC, Successive Approximation, 12-Bit, 1 Func, 1 Channel, Parallel, Word Access, BICMOS, P

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