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MAX1637

更新时间： 2024-09-13 14:57:39
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
20页 305K
描述
微型、低电压、高精度降压型控制器

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MAX1637 数据手册

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19-1321; Rev 2; 8/05  
Miniature, Low-Voltage,  
Precision Step-Down Controller  
General Description  
____________________________Features  
♦ ±±2% D%ꢀAAcurAꢁ  
♦ 0.12%(tꢁp)% D%Lord%Regclrtion%  
♦ ꢀdjcstrble%SwitAhing%FueqcenAꢁ%to%350kHz  
♦ Idle%Mode™ Pclse-Skipping%Opeurtion  
♦ 1.10V%to%5.5V%ꢀdjcstrble%Octpct%Voltrge  
The MAX1637 synchronous, buck, switch-mode power-  
supply controller generates the CPU supply voltage in  
battery-powered systems. The MAX1637 is a stripped-  
down version of the MAX1636 in a smaller 16-pin QSOP  
package. The MAX1637 is intended to be powered sep-  
arately from the battery by an external bias supply (typi-  
cally the +5V system supply) in applications where the  
battery exceeds 5.5V. The MAX1637 achieves excellent  
DC and AC output voltage accuracy. This device can  
operate from a low input voltage (3.15V) and delivers the  
excellent load-transient response needed by upcoming  
generations of dynamic-clock CPUs.  
♦ 3.15V%Minimcm%ID%Scpplꢁ%Voltrge%(rt%V  
♦ Inteunrl% igitrl%Soft-Strut  
pin)  
DD  
♦ 1.1V%±±2%RefeuenAe%Octpct  
♦ 1μꢀ%Totrl%Shctdown%Dcuuent%  
♦ Octpct%Oveuvoltrge%Duowbru%PuoteAtion  
♦ Octpct%Undeuvoltrge%Shctdown%(foldbrAk)  
♦ Tinꢁ%16-Pin%QSOP%PrAkrge  
Using synchronous rectification, the MAX1637 achieves  
up to 95% efficiency. Efficiency is greater than 80% over  
a 1000:1 load-current range, which extends battery life in  
system-suspend or standby mode. Excellent dynamic  
response corrects output load transients caused by the  
latest dynamic-clock CPUs within five 300kHz clock  
cycles. Powerful 1A on-board gate driv-ers ensure fast  
external N-channel MOSFET switching.  
______________Ordering Information  
PART  
TEMP RANGE  
40°C to +85°C  
40°C to +85°C  
PIN-PACKAGE  
16 QSOP  
The MAX1637 features a logic-controlled and synchro-  
nizable, fixed-frequency, pulse-width-modulation (PWM)  
operating mode. This reduces noise and RF interference  
in sensitive mobile-communications and pen-entry appli-  
cations. Asserting the SKIP pin enables fixed-frequency  
mode, for lowest noise under all load conditions. For a  
stand-alone device that includes a +5V VL linear regula-  
tor and low-dropout capabilities, refer to the MAX1636  
data sheet.  
MAX1637EEE  
MAX1637EEE+  
16 QSOP  
+Denotes lead-free package.  
__________Typical Operating Circuit  
V
V
BATT  
BIAS  
_________________________Applications  
V
V
GG  
CC  
Notebook Computers  
Subnotebook Computers  
SHDN  
Handy-Terminals, PDAs  
MAX1637  
__________________Pin Configuration  
DH  
BST  
LX  
TOP VIEW  
CSH  
CSL  
FB  
1
2
3
4
5
6
7
8
16 SKIP  
15 LX  
OUTPUT  
DL  
CC  
14 DH  
PGND  
CC  
MAX1637  
13 BST  
12 PGND  
11 DL  
REF  
REF  
CSH  
CSL  
SKIP  
SYNC  
GND  
SHDN  
SYNC  
GND  
10  
9
V
V
GG  
CC  
FB  
QSOP  
A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.  
Idle Mode is a trademark of Maxim Integrated Products.  
________________________________________________________________ Maxim Integrated Products  
1
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.  
1234567...20

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