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參數(shù)資料
| 型號(hào)： | MAX1677 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Compact, High-Efficiency, Dual-Output Step-Up and LCD Bias DC-DC Converter |
| 中文描述： | 緊湊的、高效率、雙輸出、升壓型和LCD偏置DC-DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 201K |
| 代理商： | MAX1677 |
General Desc ription
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.
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.
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.
Applic ations
Portable Phones
Portable Instruments
PDAs
Hand-Held Terminals
Features
o
No External FETs Required
o
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
o
Secondary Output
Up to +28V or -28V for LCD Bias
Programmable Current Limit
o
0.7V to 5.5V Input Voltage Range
o
20μA Quiescent Current
o
1μA Shutdown Current
o
Low-Battery Comparator
o
Small 16-Pin QSOP Package
M
Compac t, High-Effic ienc y, Dual-Output
S tep-Up and LCD Bias DC-DC Converter
________________________________________________________________ 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.
1
16
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14
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12
11
10
9
1
2
3
4
5
6
7
8
OUT
POUT
LX
PGND
LCDGND
LCDLX
ON
LCDFB
GND
TOP VIEW
MAX1677
FB
LBI
LCDON
LBO
CLK/SEL
LCDPOL
REF
QSOP
19-1403; Rev 0; 11/98
EVALUATION KIT MANUAL
PART
MAX1677EEE
-40°C to +85°C
TEMP. RANGE
PIN-PACKAGE
16 QSOP
FOLLOWS DATA SHEET
Pin Configuration
Ordering Information
Typic al Operating Circ uit
MAX1677
LCDLX
LX
POUT
OUT
±28V
LCD
BOOST
OUTPUT
3.3V MAIN
BOOST OUTPUT
LCDFB
REF
FB
LCDGND
GND
LCDON
LBI
ON
OFF
LBO
CLK/SEL
ON
LCDPOL
PGND
PWM
PFM
ON
OFF
+VE OUT
-VE OUT
V
IN =
0.7V to 5.5V
(UP TOMAIN
OUT
)
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PDF描述 |
|---|---|
| MAX1677EEE | Compact, High-Efficiency, Dual-Output Step-Up and LCD Bias DC-DC Converter |
| MAX1678EUA | 1-Cell to 2-Cell, Low-Noise, High-Efficiency, Step-Up DC-DC Converter |
| MAX1678 | 1-Cell to 2-Cell, Low-Noise, High-Efficiency, Step-Up DC-DC Converter |
| MAX1679EUA | Single-Cell Li Battery Charger for Current-Limited Supply |
| MAX1679 | Single-Cell Li Battery Charger for Current-Limited Supply |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1677EEE | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Compact Step-Up & LCD Bias DC/DC RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX1677EEE+ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Compact Step-Up & LCD Bias DC/DC RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX1677EEE+T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Compact Step-Up & LCD Bias DC/DC RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX1677EEE-T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Compact Step-Up & LCD Bias DC/DC RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX1677EVKIT | 功能描述:電源管理IC開發(fā)工具 Evaluation Kit for the MAX1677 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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