MAX1637 데이터 시트보기 (PDF) - Maxim Integrated
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MAX1637 Datasheet PDF : 20 Pages
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19-1321; Rev 2; 8/05
EVAALVUAAILTAIOBNLEKIT
Miniature, Low-Voltage,
Precision Step-Down Controller
General Description
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.
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.
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.
_________________________Applications
Notebook Computers
Subnotebook Computers
Handy-Terminals, PDAs
__________________Pin Configuration
TOP VIEW
CSH 1
CSL 2
FB 3
CC 4
REF 5
SHDN 6
SYNC 7
GND 8
MAX1637
QSOP
16 SKIP
15 LX
14 DH
13 BST
12 PGND
11 DL
10 VGG
9 VCC
____________________________Features
♦ ±2% DC Accuracy
♦ 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 VCC pin)
♦ Internal Digital Soft-Start
♦ 1.1V ±2% Reference Output
♦ 1μA Total Shutdown Current
♦ Output Overvoltage Crowbar Protection
♦ Output Undervoltage Shutdown (foldback)
♦ Tiny 16-Pin QSOP Package
______________Ordering Information
PART
TEMP RANGE
MAX1637EEE
40°C to +85°C
MAX1637EEE+
40°C to +85°C
+Denotes lead-free package.
PIN-PACKAGE
16 QSOP
16 QSOP
__________Typical Operating Circuit
VBIAS VBATT
VCC
VGG
SHDN
MAX1637
DH
BST
LX
CC
REF
SKIP
SYNC
GND
DL
PGND
CSH
CSL
FB
OUTPUT
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.
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