MAX1636 Maxim, MAX1636 Datasheet
MAX1636
Manufacturer Part Number
MAX1636
Description
Low-Voltage / Precision Step-Down Controller for Portable CPU Power
Manufacturer
Maxim
Datasheet
1.MAX1636.pdf
(24 pages)
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Idle Mode is a trademark of Maxim Integrated Products.
The MAX1636 is a synchronous, buck, switch-mode,
power-supply controller that generates the CPU supply
voltage in battery-powered systems. It achieves ±1%
output voltage accuracy and offers the excellent load-
transient response needed by upcoming generations of
dynamic-clock CPUs.
Up to 95% efficiency is achieved through synchronous
rectification and Maxim’s proprietary Idle Mode™ con-
trol scheme. Efficiency is greater than 80% over a
1000:1 load-current range, extending battery life in sys-
tem-suspend or standby modes. Excellent dynamic
response corrects output load transients caused by the
latest dynamic-clock CPUs within five 300kHz clock
cycles. Strong, 1A, on-board gate drivers ensure fast,
external N-channel MOSFET switching.
The MAX1636 features a logic-controlled and synchro-
nizable, fixed-frequency, pulse-width-modulation (PWM)
operating mode that reduces noise and RF interference
in sensitive mobile communications and pen-entry appli-
cations. Holding SKIP high forces fixed-frequency mode
for lowest noise under all load conditions.
For a low-cost version that omits the +5V VL linear-
regulator block and comes in a smaller 16-pin QSOP
package, refer to the MAX1637 data sheet.
________________________Applications
19-1268; Rev 0; 8/97
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.
__________________Pin Configuration
_______________General Description
TOP VIEW
Notebook Computers
Subnotebook Computers
Desktop Computers
Bus-Termination Supplies
RESET
SHDN
SYNC
GND
GND
CSH
OVP
CSL
REF
CC
________________________________________________________________ Maxim Integrated Products
10
1
2
3
4
5
6
7
8
9
MAX1636
SSOP
Low-Voltage, Precision Step-Down
Controller for Portable CPU Power
20
19
18
17
16
15
14
13
12
11
SKIP
LX
DH
BST
PGND
DL
VL
V+
V
FB
CC
____________________________Features
__________Typical Operating Circuit
______________Ordering Information
MAX1636EAP
±1% DC Accuracy (Adjustable Mode)
Output Overvoltage Crowbar Protection
Output Undervoltage Shutdown
Adjustable Switching Frequency to 340kHz
Low-Dropout Operation
Idle Mode Pulse-Skipping Operation
1.10V to 5.5V Adjustable Output Voltage
2.5V/3.3V Dual-Mode Fixed-Output Settings
Internal Digital Soft-Start
1.1V ±1% Reference Output
3µA (typ) Shutdown Current
Open-Drain Power-Good Output (R R E E S S E E T T )
20-Pin SSOP Package
PART
GND
V+
CC
SYNC
GND
SKIP
REF
MAX1636
SHDN
RESET
PGND
CSH
OVP
CSL
V
BST
DH
DL
FB
VL
CC
LX
TEMP. RANGE
-40°C to +85°C
V
TO P
IN
PIN-PACKAGE
20 SSOP
1
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