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參數(shù)資料
| 型號： | MAX786 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual-Output Power-Supply Controller for Notebook Computers(具有25μA關(guān)斷的,3.3V/5V筆記本型電腦電源) |
| 中文描述： | 雙輸出電源控制器，用于筆記本電腦 |
| 文件頁數(shù)： | 1/24頁 |
| 文件大?。?/td> | 301K |
| 代理商： | MAX786 |
__________________General Desc ription
The MAX786 is a system-engineered power-supply
controller for notebook computers or similar battery-
powered equipment. It provides two high-performance
step-down (buck) pulse-width modulators (PWMs)
for +3.3V and +5V. Other features include dual,
low-dropout, micropower linear regulators for
CMOS/RTC back-up, and two precision low-battery-
detection comparators.
High efficiency (95% at 2A; greater than 80% at loads
from 5mA to 3A) is achieved through synchronous recti-
fication and PWM operation at heavy loads, and Idle-
Mode
TM
operation at light loads. The MAX786 uses
physically small components, thanks to high operating
frequencies (300kHz/200kHz) and a new current-mode
PWM architecture that allows for output filter capacitors
as small as 30μF per ampere of load. Line- and load-
transient responses are terrific, with a high 60kHz unity-
gain crossover frequency allowing output transients to
be corrected within four or five clock cycles. Low sys-
tem cost is achieved through a high level of integration
and the use of low-cost, external N-channel MOSFETs.
Other features include low-noise, fixed-frequency PWM
operation at moderate to heavy loads, and a synchro-
nizable oscillator for noise-sensitive applications such
as electromagnetic pen-based systems and communi-
cating computers. The MAX786 is a monolithic,
BiCMOS IC available in fine-pitch, surface-mount
SSOP packages.
___________________________Applic ations
Notebook Computers
Portable Data Terminals
Communicating Computers
Pen-Entry Systems
________________________________Features
o
Dual PWM Buck Controllers (+3.3V and +5V)
o
Two Precision Comparators or Level Translators
o
95% Efficiency
o
420μA Quiescent Current, 70μA in Standby
(linear regulators alive)
o
25μA Shutdown Current (+5V linear alive)
o
5.5V to 30V Input Range
o
Small SSOP Package
o
Fixed Output Voltages:
3.3V (standard)
3.45V (High-Speed Pentium)
3.6V (PowerPC)
_________________Ordering Information
M
Dual-Output Power-S upply
Controller for Notebook Computers
_______________________________________________________________________Maxim Integrated Products
Call toll free 1-800-998-8800 for free samples or literature.
1
19-0160; Rev 1; 5/94
_____________________Pin Configuration
28
27
26
25
24
23
22
21
1
2
3
4
5
6
7
8
FB3
DH3
LX3
BST3
D1
ON3
SS3
CS3
TOP VIEW
DL3
V+
VL
FB5
Q1
Q2
VH
D2
20
19
18
17
9
10
11
12
PGND
DL5
BST5
LX5
SHDN
SYNC
REF
GND
SSOP
MAX786
16
15
13
14
DH5
CS5
SS5
ON5
TM
Idle-Mode is a trademark of Maxim Integrated Products. Pentium is a trademark of Intel. PowerPC is a trademark of IBM.
________Typic al Applic ation Diagram
MAX786
5.5V
TO
30V
SHUTDOWN
5V ON/OFF
3.3V ON/OFF
POWER
SECTION
POWER-GOOD
LOW-BATTERY WARNING
μ
P
MEMORY
PERIPHERALS
+3.3V
+5V
SYNC
SUSPEND POWER
IEvaluation Kit
28 SSOP
0°C to +70°C
MAX786RCAI
28 SSOP
0°C to +70°C
MAX786CAI
PIN-PACKAGE
TEMP. RANGE
PART
3.45V
3.3V
V
OUT
Ordering Information continued at end of data sheet.
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