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)： 8/24頁
文件大?。?/td> 301K
代理商： MAX786
M
Dual-Output Power-S upply
Controller for Notebook Computers
8
_______________________________________________________________________________________
The MAX786 has two close relatives: the MAX782 and
the MAX783. The MAX782 and MAX783 each include
an extra flyback winding regulator and linear regulators
for dual, +12V/programmable PCMCIA VPP outputs.
The MAX782/MAX783 data sheet contains extra appli-
cations information on the MAX786 not found in this
data sheet.
+3.3V S witc h-Mode S upply
The +3.3V supply is generated by a current-mode,
PWM step-down regulator using two N-channel
MOSFETs, a rectifier, and an LC output filter (Figure 1).
The gate-drive signal to the high-side MOSFET, which
must exceed the battery voltage, is provided by
a boost circuit that uses a 100nF capacitor connected
to BST3.
_________________Detailed Desc ription
The MAX786 converts a 5.5V to 30V input to four outputs
(Figure 1). It produces two high-power, PWM, switch-
mode supplies, one at +5V and the other at +3.3V. The
two supplies operate at either 300kHz or 200kHz,
allowing for small external components. Output current
capability depends on external components, and can
exceed 6A on each supply. An internal 5V, 5mA supply
(VL) and a 3.3V, 5mA reference voltage are also gener-
ated via linear regulators, as shown in Figure 2. Fault
protection circuitry shuts off the PWMs when the inter-
nal supplies lose regulation.
Two precision voltage comparators are also included.
Their output stages permit them to be used as level
translators for driving external N-channel MOSFETs in
load-switching applications, or for more conventional
logic signals.
MAX786
V+
VL
23
22
INPUT
5.5V TO30V
(NOTE 1)
C1
33
μ
F
D2A
1N4148
C5
0.1
μ
F
25
27
26
18
16
17
GND
REF
PGND
C3
1
μ
F
+3.3V AT 5mA
BST3
DH3
LX3
BST5
DH5
LX5
9
10
20
N1
C9
0.01
μ
F
+3.3V ON/OFF
+5V ON/OFF
SHUTDOWN
OSC SYNC
INPUT VOLTAGE RANGE 6.5V TO30V
AS SHOWN. SEE LOWVOLTAGE
(6-CELL) OPERATIONSECTION FOR
DETAILS.
NOTE 1:
USE SHORT, KELVIN-CONNECTED PC
BOARD TRACES PLACED VERY CLOSE
TOONE ANOTHER.
NOTE 2:
COMPARATOR SUPPLY INPUT
IN
OUT
COMPARATOR 1
IN
OUT
COMPARATOR 2
(NOTE 2)
C8
0.01
μ
F
N4
D3
1N5819
L2
10
μ
H
R2
25m
+5V
AT
3A
C6
330
μ
F
+5V AT 5mA
4.7
μ
F
C10
33
μ
F
N2
D2B
1N4148C4
0.1
μ
F
2
3
13
12
11
14
6
4
8
5
7
SS3
ON3
ON5
SHDN
SYNC
SS5
VH
D1
Q1
D2
Q2
19
15
21
DL5
CS5
FB5
(NOTE 2)
N3
D1
1N5819
L1
10
μ
H
R1
25m
+3.3V
AT
3A
C12
150
μ
F
24
1
28
DL3
CS3
FB3
C7
150
μ
F
Figure 1. MAX786 Application Circuit
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