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參數(shù)資料
| 型號： | MAX8743 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual, High-Efficiency, Step-Down Controller with High Impedance in Shutdown |
| 中文描述： | 雙路、高效率、降壓型控制器，關斷狀態(tài)下提供高阻 |
| 文件頁數(shù)： | 1/27頁 |
| 文件大小： | 864K |
| 代理商： | MAX8743 |
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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 MAX8743 is a dual pulse-width modulation (PWM)
controller configured for step-down (buck) topologies
that provides the high efficiency, excellent transient
response, and high DC output accuracy necessary for
stepping down high-voltage batteries 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 cur-
rent-sense elements. High output impedance in shut-
down eliminates negative output voltages, saving the
cost of a Schottky diode at the output.
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 MAX8743 is simple and easy
to compensate.
Single-stage buck conversion allows the MAX8743 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 MAX8743 is intended for generating chipset, DRAM,
CPU I/O, or other low-voltage supplies down to 1V. The
MAX8743 is available in 28-pin QSOP and 36-pin thin
QFN packages.
Applications
Notebook Computers
CPU Core Supplies
Chipset/RAM Supplies as Low as 1V
1.8V and 2.5V I/O Supplies
Features
Ultra-High Efficiency
Accurate Current-Limit Option
Quick-PWM with 100ns Load-Step Response
1% V
OUT
Accuracy over Line and Load
High Output Impedance in Shutdown
Dual Mode Fixed 1.8V/1.5V/Adj or 2.5V/Adj Outputs
Adjustable 1V to 5.5V Output Range
2V to 28V Battery Input Range
200kHz/300kHz/420kHz/540kHz Nominal Switching
Frequency
Adjustable Overvoltage Protection
1.7ms Digital Soft-Start
Drives Large Synchronous-Rectifier FETs
Power-Good Window Comparator
2V ±1% Reference Output
Ordering Information
M
Dual, High-Efficiency, Step-Down
Controller with High Impedance in Shutdown
________________________________________________________________
Maxim Integrated Products
1
19-3318; Rev 0; 6/04
Pin Configurations appear at end of data sheet.
Quick-PWM and Dual Mode are trademarks of Maxim Integrated
Products, Inc.
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
MAX8743EEI
UVP
OVP
Minimal Operating Circuit
PART
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
28 QSOP
MAX8743EEI
MAX8743ETX
-40°C to +85°C
36 Thin QFN
6mm x 6mm
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| MAX8743ETX | Dual, High-Efficiency, Step-Down Controller with High Impedance in Shutdown |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8743EEI | 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX8743EEI+ | 功能描述:電流型 PWM 控制器 Dual Step-Down Controller RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX8743EEI+T | 功能描述:電流型 PWM 控制器 Dual Step-Down Controller RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX8743EEI-T | 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX8743ETX | 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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