MAX1677

更新时间： 2024-09-30 22:57:59

品牌	Logo	应用领域
美信 - MAXIM		转换器 DC-DC转换器
页数	文件大小	规格书
16页	202K
描述
Compact, High-Efficiency, Dual-Output Step-Up and LCD Bias DC-DC Converter

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MAX1677 数据手册

19-1403; Rev 0; 11/98

Co m p a c t , Hig h -Effic ie n c y, Du a l-Ou t p u t

S t e p -Up a n d LCD Bia s DC-DC Co n ve rt e r

MAX167

Ge n e ra l De s c rip t io n

Fe a t u re s

The MAX1677 is a compact, high-efficiency, dual-out-

put boost converter for portable devices needing two

regulated supplies, typically for logic and liquid crystal

displays (LCDs). Operation with inputs as low as 0.7V

allows the MAX1677 to accept 1, 2, or 3-cell alkaline,

NiCd, or NiMH batteries as well as 1-cell lithium-ion bat-

teries. The device requires no external FETs and can

maintain regulation while consuming only 20µA, making

it ideal for hand-held pen-input and PDA devices oper-

ating with low-current “sleep” states.

♦ No External FETs Required

♦ Main Output

Up to 350mA for Logic Supply

Fixed 3.3V or Adjustable (2.5V to 5.5V)

Synchronous Rectification for High Efficiency

(up to 95%)

300kHz (200kHz to 400kHz Synchronizable)

Fixed-Frequency PWM Operation

♦ Secondary Output

The MAX1677’s p rima ry re g ula tor s up p lie s up to

350mA at either a factory-preset 3.3V or an adjustable

2.5V to 5.5V output. On-chip synchronous rectification

provides efficiencies up to 95%. 300kHz (or externally

clocked) pulse-width-modulation (PWM) operation is

particularly suitable for applications needing low noise,

such as those with wireless features. The primary con-

verter also features pin-selectable pulse-frequency-

modulation (PFM) operation that consumes only 20µA.

A 1µA shutdown state also minimizes battery drain.

Up to +28V or -28V for LCD Bias

Programmable Current Limit

♦ 0.7V to 5.5V Input Voltage Range

♦ 20µA Quiescent Current

♦ 1µA Shutdown Current

♦ Low-Battery Comparator

♦ Small 16-Pin QSOP Package

The MAX1677’s secondary step-up converter supplies up

to +28V or -28V for LCD bias, varactor tuning, or other

high-voltage, low-current functions. Other MAX1677 fea-

tures include precision reference, logic control inputs for

both regulators, and an uncommitted comparator for

low-battery detection or a reset function. The MAX1677

is supplied in Maxim’s compact 16-pin QSOP package,

which occupies no more space than a standard SO-8.

Ord e rin g In fo rm a t io n

PART

TEMP. RANGE

PIN-PACKAGE

MAX1677EEE

-40°C to +85°C

16 QSOP

Typ ic a l Op e ra t in g Circ u it

Ap p lic a t io n s

PDAs

Portable Phones

Hand-Held Terminals

Portable Instruments

= 0.7V to 5.5V

3.3V MAIN

(UP TO MAIN

)

BOOST OUTPUT

OUT

POUT

P in Co n fig u ra t io n

MAX1677

±28V

LCD

BOOST

OUTPUT

LCDLX

OUT

LBO

TOP VIEW

OUT

16 POUT

15 LX

LBI

LCDFB

REF

LCDON

LBI

14 PGND

OFF

PWM

LBO

MAX1677

13 LCDGND

12 LCDLX

11 ON

CLK/SEL

PFM

CLK/SEL

LCDON

LCDPOL

REF

OFF

+VE OUT

LCDGND

GND

LCDPOL

PGND

-VE OUT

10 LCDFB

GND

QSOP

________________________________________________________________ Maxim Integrated Products

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

12 3 4 5 6 7...16

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与MAX1677相关器件

型号	品牌	获取价格	描述	数据表
MAX1677EEE	MAXIM	获取价格	Compact, High-Efficiency, Dual-Output Step-Up and LCD Bias DC-DC Converter
MAX1677EEE+	MAXIM	获取价格	Switching Regulator, Current-mode, 0.8A, 360kHz Switching Freq-Max, PDSO16, 0.150 INCH, 0.
MAX1677EEE+T	MAXIM	获取价格	Switching Regulator, Current-mode, 0.8A, 360kHz Switching Freq-Max, PDSO16, 0.150 INCH, 0.
MAX1677EEE-T	MAXIM	获取价格	Switching Regulator, Current-mode, 0.8A, 360kHz Switching Freq-Max, PDSO16, 0.150 INCH, 0.
MAX1677EVKIT	MAXIM	获取价格	Evaluation Kit for the MAX1677
MAX1678	MAXIM	获取价格	1-Cell to 2-Cell, Low-Noise, High-Efficiency, Step-Up DC-DC Converter
MAX1678	ADI	获取价格	1节至2节电池、低噪声、高效率、升压型DC-DC转换器
MAX1678EUA	MAXIM	获取价格	1-Cell to 2-Cell, Low-Noise, High-Efficiency, Step-Up DC-DC Converter
MAX1678EUA+	MAXIM	获取价格	Switching Regulator, Voltage-mode, 1A, 150kHz Switching Freq-Max, BICMOS, PDSO8, 1.10 MM H
MAX1678EUA+T	MAXIM	获取价格	Switching Regulator, Voltage-mode, 1A, 150kHz Switching Freq-Max, BICMOS, PDSO8, 1.10 MM H

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