MAX8678

更新时间： 2024-01-27 06:36:34

品牌	Logo	应用领域
美信 - MAXIM		音频放大器泵
页数	文件大小	规格书
13页	255K
描述
White LED Charge Pump with 1.1W Audio Amplifier

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MAX8678 数据手册

19-0786; Rev 0; 4/07

White LED Charge Pump with

1.1W Audio Amplifier

MAX678

General Description

Features

The MAX8678 integrates a charge pump for white light-

emitting diodes (LEDs) with an audio loudspeaker

amplifier. The high-efficiency, adaptive charge pump

drives up to four LEDs with constant current for uniform

brightness. The LED current is adjustable from

0.1mA/LED to 24mA/LED in 31 pseudo-logarithmic

steps through a single-wire serial-pulse interface. High

accuracy and LED-to-LED current matching are main-

tained throughout the adjustment range. Individual

adaptive mode switching for each LED provides high

efficiency with a wide range of LED forward voltages.

♦ High-Efficiency White LED Charge Pump

Individual Adaptive Supply for Each LED

4 Low-Dropout LED Current Regulators

24mA to 0.1mA Dimming Range

Single-Wire, Serial-Pulse Dimming Interface

1% (typ) Accuracy

Low 140µA Quiescent Current

♦ Mono Class AB Audio Amplifier

1.1W RMS Mono BTL Output (8Ω, V_IN= 5V)

Low 0.004% THD+N at 1kHz

High 90dB PSRR at 1kHz

Fully Differential Inputs

The mono class AB audio amplifier directly drives an 8Ω

loudspeaker with 1.1W RMS continuous power from a 5V

supply with less than 1% THD+N. The gain is adjustable

from -9dB to +18dB in ten 3dB steps through a single-

wire serial-pulse interface. Clicks and pops are sup-

pressed during on/off and all gain adjustments.

Differential inputs improve common-mode noise rejection.

-9dB to +18dB Gain Settings in 3dB Steps

Integrated Click/Pop Suppression

Low Quiescent Current

♦ Soft-Start Limits Inrush Current

♦ Thermal Shutdown, Open- and Short-Circuit

Protection

The MAX8678 includes soft-start, thermal shutdown,

open-circuit and short-circuit protection, and is avail-

able in the 16-pin, 3mm x 3mm Thin QFN package

(0.8mm max height).

♦ 16-Pin, 3mm x 3mm Thin QFN Package

Ordering Information

Applications

PART

PIN-PACKAGE TOP MARK PKG CODE

Cell Phones and Smartphones

16 Thin QFN

3mm x 3mm

MAX8678ETE+

AFF

T1633-5

Camera Phones

+Denotes a lead-free package.

PDAs, Digital Cameras, Camcorders

Note: The device is specified over the -40°C to +85°C extend-

ed temperature range.

Typical Operating Circuit

INPUT

2.7V TO 5.5V

Pin Configuration

1μF

TOP VIEW

C+

C-

LED1

LED2

LED3

LED4

BACKLIGHT

OR FLASH

4.7μF

GND

BIAS

NEG 13

C- 14

0.1mA TO

24mA

OUT-

0.1μF

LED ON/OFF

AND DIMMING

ENLED

MAX8678

BIAS

C+

OUT+

AMP ON/OFF

AND GAIN

ENAMP

A+

ENAMP

ENLED

OUT+

OUT-

DIFFERENTIAL

AUDIO

LOUDSPEAKER

8Ω

A-

INPUT

NEG

THIN QFN

3mm × 3mm

1μF

________________________________________________________________ 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...13

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与MAX8678相关器件

型号	品牌	获取价格	描述	数据表
MAX8678ETE	MAXIM	获取价格	White LED Charge Pump with 1.1W Audio Amplifier
MAX8678ETE+	MAXIM	获取价格	Audio Amplifier, 1.1W, 1 Channel(s), 1 Func, BICMOS, 3 X 3 MM, 0.80 MM HEIGHT, LEAD FREE,
MAX8678ETE+T	MAXIM	获取价格	暂无描述
MAX867C/D	MAXIM	获取价格	3.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters
MAX867ESA	MAXIM	获取价格	3.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters
MAX867ESA+	MAXIM	获取价格	Switching Regulator, 250kHz Switching Freq-Max, CMOS, PDSO8, 0.150 INCH, SOP-8
MAX867ESA+T	MAXIM	获取价格	Switching Regulator, 250kHz Switching Freq-Max, CMOS, PDSO8, 0.150 INCH, SOP-8
MAX867ESA-T	MAXIM	获取价格	暂无描述
MAX867EUA	MAXIM	获取价格	3.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters
MAX867EUA+	MAXIM	获取价格	暂无描述

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