MAX6948B

更新时间： 2024-02-06 00:22:43

品牌	Logo	应用领域
美信 - MAXIM		驱动器转换器升压转换器
页数	文件大小	规格书
28页	2022K
描述
High-Efficiency PWM LED Driver with Boost Converter and Five Constant-Current GPIO Ports

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MAX6948B 数据手册

19-4935; Rev 0; 9/09

High-Efficiency PWM LED Driver with Boost

Converter and Five Constant-Current GPIO Ports

General Description

Features

S 28V Step-Up DC-DC Converter with Integrated

The MAX6948B general-purpose input/output (GPIO)

peripheral drives a series string of white LEDs (WLEDs),

and contains up to five general-purpose input/output

(GPIO) ports to drive additional LEDs.

nMOS Power Switch

S Built-In 10-Bit PWM Control for Improved Efficiency

S No Discharge Path During PWM Off Period for

Increased Battery Life

The integrated 2MHz boost converter minimizes the size

and cost of external components and supplies 30mA of

load current at up to 28V. The converter is stable under

all load conditions from 5V up to 28V and includes

open-circuit detection to prevent damage to the IC. An

S Fixed 2MHz Switching for Smaller Components

Drives up to 6 Series WLEDs

8ꢀV Human Body Model (HBM) ESD Protection

for GPIOs and Boost-Converter Output

S Five Open-Drain GPIOs Capable of Constant-

Current LED Drive with Individual 8-Bit PWM

Intensity Control

I C-programmable 10-bit pulse-width modulation (PWM)

signal enables 1024 levels of WLED intensity.

The five GPIO ports function as logic inputs, open-

drain logic outputs, or constant-current sinks in any

combination. Ports withstand 5.5V independent of the

MAX6948B’s supply voltage. Two of the ports drive addi-

tional LEDs up to 30mA/port, while the other three ports

drive LEDs at up to 10mA/port. The MAX6948B features

shutdown and standby modes for low-power dissipa-

tion. The constant-current drivers contain programmable

PWM outputs and allow staggering to reduce the input

peak-current requirements. The I/O ports also feature

ramp-up and ramp-down controls.

S 2.7V to 5V Power-Supply Operation

S 400ꢀbps, 5.5V Tolerant I C Interface

S Four I C Slave Address Choices

S RST Input Clears Serial Interface and Exits

Shutdown (Reset-Run Option)

S Small (2.31mm x 2.31mm) WLP Pacꢀage

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX6948BGWA+ -40NC to +105NC

25 WLP

The MAX6948B features a single input to select from four

+Denotes a lead(Pb)-free/RoHS-compliant package.

I C slave addresses. Programming and functionality for

the five GPIO ports is identical to the MAX6946/MAX6947

I/O expanders.

Typical Operating Circuit

The MAX6948B is available in a 25-bump (2.31mm x

2.31mm) WLP package for cell phones, PDAs, and

other portable consumer electronic applications. The

MAX6948B operates over the -40NC to +105NC tempera-

ture range.

2.7V TO 5.0V

10µH

2.2FF

0.22FF

V+

OUT

PGND

Applications

LED Backlighting for LCDs

Cell Phones

MAX6948B

SCL

SDA

RST

LEDSW

PDAs

EXT

Handheld Games

1.7V TO V+

Portable Consumer Electronics

0.1FF

COMP

AD0

47nF

GND

NOTE: R = 0.2V/I = 0.2V/0.03A = 6.7I.

LED

_______________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7...28

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与MAX6948B相关器件

型号	品牌	获取价格	描述	数据表
MAX6948BGWA+	MAXIM	获取价格	High-Efficiency PWM LED Driver with Boost Converter and Five Constant-Current GPIO Ports
MAX6948EVKIT	MAXIM	获取价格	MAX6948 Evaluation Kit
MAX694C/D	MAXIM	获取价格	Microprocessor Supervisory Circuits
MAX694CPA	MAXIM	获取价格	Microprocessor Supervisory Circuits
MAX694EJA	MAXIM	获取价格	Microprocessor Supervisory Circuits
MAX694EPA	MAXIM	获取价格	Microprocessor Supervisory Circuits
MAX694EPA+	MAXIM	获取价格	Power Supply Management Circuit, Fixed, 1 Channel, CMOS, PDIP8, LEAD FREE, PLASTIC, DIP-8
MAX694MFB/883B	MAXIM	获取价格	Power Management Circuit, CMOS, CDFP10, FP-10
MAX694MJA	MAXIM	获取价格	Microprocessor Supervisory Circuits
MAX694MJA	ROCHESTER	获取价格	Power Supply Management Circuit, Adjustable, 1 Channel, CDIP8, CEDIP-8

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