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MAX1637

更新时间： 2024-09-11 22:57:59
品牌 Logo 应用领域
美信 - MAXIM 控制器
页数 文件大小 规格书
20页 212K
描述
Miniature, Low-Voltage, Precision Step-Down Controller

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MAX1637 数据手册

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19-1321; Rev 1; 2/98  
Min ia t u re , Lo w -Vo lt a g e ,  
P re c is io n S t e p -Do w n Co n t ro lle r  
MAX1637  
Ge n e ra l De s c rip t io n  
____________________________Fe a t u re s  
♦ ±2% DC Accuracy  
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.  
♦ 0.1% (typ) DC Load Regulation  
♦ Adjustable Switching Frequency to 350kHz  
♦ Idle Mode™ Pulse-Skipping Operation  
♦ 1.10V to 5.5V Adjustable Output Voltage  
♦ 3.15V Minimum IC Supply Voltage (at V  
♦ Internal Digital Soft-Start  
pin)  
CC  
♦ 1.1V ±2% Reference Output  
♦ 1µA Total Shutdown Current  
Using synchronous rectification, the MAX1637 achieves  
up to 95% efficiency. Efficiency is greater than 80%  
over a 1000:1 load-current range, which extends bat-  
tery life in system-suspend or standby mode. Excellent  
d yna mic re s p ons e c orre c ts outp ut loa d tra ns ie nts  
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.  
♦ Output Overvoltage Crowbar Protection  
♦ Output Undervoltage Shutdown (foldback)  
♦ Tiny 16-Pin QSOP Package  
______________Ord e rin g In fo rm a t io n  
The MAX1637 features a logic-controlled and synchro-  
niza b le , fixe d -fre q ue nc y, p uls e -wid th-mod ula tion  
(PWM) operating mode. This reduces noise and RF  
interference in sensitive mobile-communications and  
pen-entry applications. 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 regulator and low-dropout capabilities,  
refer to the MAX1636 data sheet.  
PART  
TEMP. RANGE  
PIN-PACKAGE  
MAX1637EEE  
-40°C to +85°C  
16 QSOP  
__________Typ ic a l Op e ra t in g Circ u it  
V
BIAS  
V
BATT  
V
CC  
V
GG  
________________________Ap p lic a t io n s  
Notebook Computers  
Subnotebook Computers  
SHDN  
MAX1637  
Handy-Terminals, PDAs  
DH  
__________________P in Co n fig u ra t io n  
BST  
LX  
DL  
OUTPUT  
TOP VIEW  
CSH  
CSL  
FB  
1
2
3
4
5
6
7
8
16 SKIP  
15 LX  
CC  
PGND  
REF  
14 DH  
13 BST  
12 PGND  
11 DL  
CSH  
CSL  
SKIP  
SYNC  
GND  
CC  
MAX1637  
REF  
FB  
SHDN  
SYNC  
GND  
10  
9
V
GG  
V
CC  
QSOP  
Idle Mode is a trademark of Maxim Integrated Products.  
________________________________________________________________ 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 408-737-7600 ext. 3468.  
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