參數(shù)資料
型號(hào)： MAX1957
廠商： Maxim Integrated Products, Inc.
英文描述： Low-Cost, High-Frequency, Current-Mode PWM Buck Controller
中文描述： 低成本、高頻、電流模式PWM buck控制器
文件頁(yè)數(shù)： 1/22頁(yè)
文件大?。?/td> 642K
代理商： MAX1957
General Description
The MAX1953/MAX1954/MAX1957 is a family of versa-
tile, economical, synchronous current-mode, pulse-width
modulation (PWM) buck controllers. These step-down
controllers are targeted for applications where cost and
size are critical.
The MAX1953 operates at a fixed 1MHz switching fre-
quency, thus significantly reducing external component
size and cost. Additionally, excellent transient response
is obtained using less output capacitance. The MAX1953
operates from low 3V to 5.5V input voltage and can sup-
ply up to 10A of output current. Selectable current limit is
provided to tailor to the external MOSFETs’ on-resistance
for optimum cost and performance. The output voltage is
adjustable from 0.8V to 0.86V
IN
.
With the MAX1954, the drain-voltage range on the high-
side FET is 3V to 13.2V and is independent of the supply
voltage. It operates at a fixed 300kHz switching frequen-
cy and can be used to provide up to 25A of output cur-
rent with high efficiency. The output voltage is adjustable
from 0.8V to 0.86V
HSD
.
The MAX1957 features a tracking output voltage range of
0.4V to 0.86V
IN
and is capable of sourcing or sinking
current for applications such as DDR bus termination
and PowerPC/ASIC/DSP core supplies. The MAX1957
operates from a 3V to 5.5V input voltage and at a fixed
300kHz switching frequency.
The MAX1953/MAX1954/MAX1957 provide a COMP pin
that can be pulled low to shut down the converter in
addition to providing compensation to the error amplifier.
An input undervoltage lockout (ULVO) is provided to
ensure proper operation under power-sag conditions to
prevent the external power MOSFETs from overheating.
Internal digital soft-start is included to reduce inrush cur-
rent. The MAX1953/MAX1954/MAX1957 are available in
tiny 10-pin μMAX packages.
Applications
Printers and Scanners
Graphic Cards and Video Cards
PCs and Servers
Microprocessor Core Supply
Low-Voltage Distributed Power
Telecommunications and Networking
Features
o
Low-Cost Current-Mode Controllers
o
Fixed-Frequency PWM
o
MAX1953
1MHz Switching Frequency
Small Component Size, Low Cost
Adjustable Current Limit
o
MAX1954
3V to 13.2V Input Voltage
25A Output Current Capability
93% Efficiency
300kHz Switching Frequency
o
MAX1957
Tracking 0.4V to 0.86V
IN
Output Voltage Range
Sinking and Sourcing Capability of 3A
o
Shutdown Feature
o
All N-Channel MOSFET Design for Low Cost
o
No Current-Sense Resistor Needed
o
Internal Digital
Soft-Start
o
Thermal Overload Protection
o
Small 10-Pin μMAX Package
M
Low-Cost, High-Frequency, Current-Mode PWM
Buck Controller
________________________________________________________________
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
Ordering Information
TEMP RANGE
PIN-PACKAGE
-40
°
C to +85
°
C
10 μMAX
-40
°
C to +85
°
C
10 μMAX
-40
°
C to +85
°
C
10 μMAX
19-2373; Rev 0; 4/02
PART
MAX1953
EUB
MAX1954
EUB
MAX1957
EUB
TOP VIEW
1
2
3
4
5
10
9
8
7
6
BST
LX
DH
PGND
GND
FB
COMP
ILIM
MAX1953EUB
μ
MAX
DL
IN
Pin Configurations
Pin Configurations continued at end of data sheet.
Patent Pending
PowerPC is a trademark of Motorola, Inc.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1957EUB 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX1957EUB+ 功能描述:電流型 PWM 控制器 High-f Current-Mode PWM Buck Controller RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX1957EUB+T 功能描述:電流型 PWM 控制器 High-f Current-Mode PWM Buck Controller RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX1957EUB-T 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX19586ETN 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類(lèi)型:Differential 信噪比:107 dB 接口類(lèi)型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
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