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参数资料
| 型号： | MAX1845ETX |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | Dual, High-Efficiency, Step-Down Controller with Accurate Current Limit |
| 中文描述： | DUAL SWITCHING CONTROLLER, 620 kHz SWITCHING FREQ-MAX, QCC36 |
| 封装： | 6 X 6 MM, 0.80 MM, MO220WJJD-1, TQFN-36 |
| 文件页数： | 1/27页 |
| 文件大小： | 543K |
| 代理商： | MAX1845ETX |
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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.
General Description
The MAX1845 is a dual PWM controller configured for
step-down (buck) topologies that provides high efficien-
cy, excellent transient response, and high DC output
accuracy necessary for stepping down high-voltage bat-
teries to generate low-voltage chipset and RAM power
supplies in notebook computers. The CS_ inputs can be
used with low-side sense resistors to provide accurate
current limits or can be connected to LX_, using low-side
MOSFETs as current-sense elements.
The on-demand PWM controllers are free running, con-
stant on-time with input feed-forward. This configuration
provides ultra-fast transient response, wide input-output
differential range, low supply current, and tight load-reg-
ulation characteristics. The MAX1845 is simple and easy
to compensate.
Single-stage buck conversion allows the MAX1845 to
directly step down high-voltage batteries for the highest
possible efficiency. Alternatively, two-stage conversion
(stepping down the 5V system supply instead of the bat-
tery at a higher switching frequency) allows the minimum
possible physical size.
The MAX1845 is intended for generating chipset, DRAM,
CPU I/O, or other low-voltage supplies down to 1V. For a
single-output version, refer to the MAX1844 data sheet.
The MAX1845 is available in 28-pin QSOP and 36-pin
thin QFN packages.
Applications
Notebook Computers
CPU Core Supplies
Chipset/RAM Supply as Low as 1V
1.8V and 2.5V I/O Supplies
Features
o
Ultra-High Efficiency
o
Accurate Current-Limit Option
o
Quick-PWM with 100ns Load-Step Response
o
1% V
OUT
Accuracy over Line and Load
o
Dual Mode Fixed 1.8V/1.5V/Adj or 2.5V/Adj Outputs
o
Adjustable 1V to 5.5V Output Range
o
2V to 28V Battery Input Range
o
200/300/420/540kHz Nominal Switching Frequency
o
Adjustable Overvoltage Protection
o
1.7ms Digital Soft-Start
o
Drives Large Synchronous-Rectifier FETs
o
Power-Good Window Comparator
o
2V ±1% Reference Output
M
Dual, High-Efficiency, Step-Down
Controller with Accurate Current Limit
________________________________________________________________
Maxim Integrated Products
1
19-1955; Rev 2; 1/03
EVALUATION KIT
AVAILABLE
Pin Configurations appear at end of data sheet.
Quick-PWM and Dual Mode are trademarks of Maxim Integrated
Products.
V
CC
OUTPUT1
1.8V
BATTERY
4.5V TO 28V
ILIM1
ILIM2
ON1
ON2
DL1
TON
CS1
OUT1
PGOOD
LX1
DH1
FB1
GND
V
DD
BST1
REF
DL2
CS2
OUT2
SKIP
LX2
DH2
FB2
V+
BST2
5V INPUT
OUTPUT2
2.5V
MAX1845EEI
UVP
OVP
Minimal Operating Circuit
Ordering Information
PART
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
28 QSOP
MAX1845EEI
MAX1845ETX
-40°C to +85°C
36 Thin QFN
6mm
6mm
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1845ETX+ | 功能描述:电流型 PWM 控制器 Step-Down Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1845ETX+T | 功能描述:电流型 PWM 控制器 Step-Down Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1845ETX-T | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1845ETX-TG068 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1845EVKIT | 功能描述:电源管理IC开发工具 Evaluation Kit for the MAX1845 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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