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MAX1703ESE 参数 Datasheet PDF下载

MAX1703ESE图片预览
型号: MAX1703ESE
PDF下载: 下载PDF文件 查看货源
内容描述: 1节至3节电池,大功率1.5A ,低噪声,升压型DC- DC转换器 [1-Cell to 3-Cell, High-Power 1.5A, Low-Noise, Step-Up DC-DC Converter]
分类和应用: 转换器稳压器开关式稳压器或控制器电源电路电池开关式控制器光电二极管
文件页数/大小: 16 页 / 274 K
品牌: MAXIM [ MAXIM INTEGRATED PRODUCTS ]
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19-1336; Rev 2; 11/98
NUAL
KIT MA
ATION
ET
EVALU
TA SHE
WS DA
FOLLO
1-Cell to 3-Cell, High-Power (1.5A),
Low-Noise, Step-Up DC-DC Converter
____________________________Features
o
Up to 95% Efficiency
o
Up to 1.5A Output
o
Fixed 5V or Adjustable Step-Up Output
(2.5V to 5.5V)
o
0.7V to 5.5V Input Range
o
Low-Power Mode (300µW)
o
Low-Noise, Constant-Frequency Mode (300kHz)
o
Synchronizable Switching Frequency
(200kHz to 400kHz)
o
1µA Logic-Controlled Shutdown
o
Power-Good Comparator
o
Uncommitted Gain Block
________________General Description
The MAX1703 is a high-efficiency, low-noise, step-up
DC-DC converter intended for use in battery-powered
wireless applications. It uses a synchronous-rectified
pulse-width-modulation (PWM) boost topology to gen-
erate a 2.5V to 5.5V output from battery inputs, such as
one to three NiCd/NiMH cells or one Li-Ion cell. The
device includes a 2A, 75mΩ, N-channel MOSFET
switch and a 140mΩ, P-channel synchronous rectifier.
With its internal synchronous rectifier, the MAX1703
delivers up to 5% better efficiency than similar nonsyn-
chronous converters. It also features a pulse-frequency-
modulation (PFM) low-power mode to improve efficiency
at light loads, and a 1µA shutdown mode.
The MAX1703 comes in a 16-pin narrow SO package
and includes an uncommitted comparator that generates
a power-good or low-battery-warning output. It also
contains a linear gain block that can be used to build a
linear regulator.
For lower-power outputs and a smaller package, refer
to the MAX1700/MAX1701. For dual outputs (step-up
plus linear regulator), refer to the MAX1705/MAX1706.
For an on-board analog-to-digital converter, refer to the
MAX848/MAX849.
The MAX1703 evaluation kit is available to speed designs.
MAX1703
Ordering Information
PART
MAX1703ESE
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
16 Narrow SO
________________________Applications
Digital Cordless Phones
PCS Phones
Wireless Handsets
Two-Way Pagers
Personal Communicators
Palmtop Computers
Hand-Held Instruments
Typical Operating Circuit
INPUT
0.7V TO 5.5V
Pin Configuration
TOP VIEW
MAX1703
OFF
ON
PWM
OR
PFM
POWER-GOOD
INPUT
GAIN-BLOCK INPUT
POKIN
AIN
REF
FB
POK
AO
GND PGND
SYNC
ON
CLK/
SEL
OUT
LXP, LXN
POUT
OUTPUT
5V OR ADJ
UP TO 1.5A
REF 1
FB 2
POKIN 3
OUT 4
GND 5
16 ON
15 POUT
14 LXP
MAX1703
13 POUT
12 PGND
11 LXN
10 PGND
9
CLK/SEL
POWER-GOOD
OUTPUT
GAIN-BLOCK
OUTPUT
AIN 6
AO 7
POK 8
Narrow SO
________________________________________________________________
Maxim Integrated Products
1
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.