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| 型号： | MAX1677EEE-T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BST SYNC 0.35A DL 16QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 两者兼有 |
| 输出数： | 2 |
| 输出电压： | 3.3V 或可调主电源，-28 V ~ 28 V 或可调副电源 |
| 输入电压： | 0.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 300kHz |
| 电流 - 输出： | 350mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QSOP |
19-1403; Rev 1; 3/01
EVALU
ATION
AV AILABL
KIT
E
Compact, High-Efficiency, Dual-Output
Step-Up and LCD Bias DC-DC Converter
General Description
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-
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
Ordering Information
tures include precision reference, logic control inputs for
both regulators, and an uncommitted comparator for
low-battery detection or a reset function. The MAX1677
PART
MAX1677EEE
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
16 QSOP
is supplied in Maxim’s compact 16-pin QSOP package,
which occupies no more space than a standard SO-8.
Applications
Typical Operating Circuit
PDAs
Portable Phones
Hand-Held Terminals
Portable Instruments
Pin Configuration
V IN = 0.7V to 5.5V
(UP TO MAIN OUT )
LX
POUT
MAX1677
3.3V MAIN
BOOST OUTPUT
±28V
TOP VIEW
LCDLX
OUT
LCD
BOOST
OUT 1
FB 2
16 POUT
15 LX
ON
LBI
LBO
LCDFB
OUTPUT
LBI 3
LBO 4
CLK/SEL 5
LCDON 6
LCDPOL 7
MAX1677
14 PGND
13 LCDGND
12 LCDLX
11 ON
10 LCDFB
OFF
PFM
OFF
-VE OUT
PWM
ON
+VE OUT
LCDON
CLK/SEL
ON
LCDPOL
PGND
REF
FB
LCDGND
GND
REF 8
QSOP
9
GND
________________________________________________________________ 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.
1
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| MAX1677EVKIT | 功能描述:电源管理IC开发工具 Evaluation Kit for the MAX1677 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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| MAX1678EUA+T | 功能描述:直流/直流开关转换器 1-2 Cell Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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