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MAX1677

更新时间： 2024-10-02 14:57:55
品牌 Logo 应用领域
亚德诺 - ADI DC-DC转换器
页数 文件大小 规格书
16页 313K
描述
紧凑的、高效率、双输出、升压型和LCD偏置DC-DC转换器

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MAX1677 数据手册

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19-1403; Rev 1; 3/01  
Compact, High-Efficiency, Dual-Output  
Step-Up and LCD Bias DC-DC Converter  
General Description  
Features  
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 primary regulator supplies 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.  
Ordering Information  
PART  
TEMP RANGE  
PIN-PACKAGE  
MAX1677EEE  
-40°C to +85°C  
16 QSOP  
Typical Operating Circuit  
Applications  
PDAs  
Portable Phones  
Hand-Held Terminals  
Portable Instruments  
V
= 0.7V to 5.5V  
3.3V MAIN  
BOOST OUTPUT  
IN  
(UP TO MAIN  
)
OUT  
LX  
POUT  
Pin Configuration  
MAX1677  
LCDLX  
28V  
LCD  
OUT  
LBO  
TOP VIEW  
BOOST  
OUTPUT  
OUT  
FB  
1
2
3
4
5
6
7
8
16 POUT  
15 LX  
LBI  
LCDFB  
REF  
ON  
LCDON  
LBI  
14 PGND  
OFF  
PWM  
LBO  
MAX1677  
13 LCDGND  
12 LCDLX  
11 ON  
CLK/SEL  
PFM  
ON  
FB  
CLK/SEL  
LCDON  
LCDPOL  
REF  
ON  
OFF  
+VE OUT  
LCDGND  
GND  
LCDPOL  
PGND  
-VE OUT  
10 LCDFB  
9
GND  
QSOP  
________________________________________________________________ Maxim Integrated Products  
1
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.  
1234567...16

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与MAX1677相关器件

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MAX1677EEE MAXIM

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 		Compact, High-Efficiency, Dual-Output Step-Up and LCD Bias DC-DC Converter
MAX1677EEE+ MAXIM

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 		Switching Regulator, Current-mode, 0.8A, 360kHz Switching Freq-Max, PDSO16, 0.150 INCH, 0.
MAX1677EEE+T MAXIM

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 		Switching Regulator, Current-mode, 0.8A, 360kHz Switching Freq-Max, PDSO16, 0.150 INCH, 0.
MAX1677EEE-T MAXIM

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 		Switching Regulator, Current-mode, 0.8A, 360kHz Switching Freq-Max, PDSO16, 0.150 INCH, 0.
MAX1677EVKIT MAXIM

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 		Evaluation Kit for the MAX1677
MAX1678 MAXIM

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 		1-Cell to 2-Cell, Low-Noise, High-Efficiency, Step-Up DC-DC Converter
MAX1678 ADI

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 		1节至2节电池、低噪声、高效率、升压型DC-DC转换器
MAX1678EUA MAXIM

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 		1-Cell to 2-Cell, Low-Noise, High-Efficiency, Step-Up DC-DC Converter
MAX1678EUA+ MAXIM

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 		Switching Regulator, Voltage-mode, 1A, 150kHz Switching Freq-Max, BICMOS, PDSO8, 1.10 MM H
MAX1678EUA+T MAXIM

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 		Switching Regulator, Voltage-mode, 1A, 150kHz Switching Freq-Max, BICMOS, PDSO8, 1.10 MM H

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