MAX786 データシートの表示（PDF） - Maxim Integrated
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MAX786 Datasheet PDF : 20 Pages
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Dual-Output Power-Supply
Controller for Notebook Computers
Table 3. EV Kit Power-Supply Controls (SW1)
SWITCH NAME
FUNCTION
ON
OFF
SETTING SETTING
1
SHDN
Enable shutdown
mode
Operate
Shutdown
2
ON3
Enable 3.3V
power supply
3.3V ON 3.3V OFF
3
ON5
Enable 5.0V
power supply
5V ON 5V OFF
4
SYNC
Oscillator
200kHz 300kHz
Other ways to shut down the MAX786 are suggested
in the applications section of the MAX782/MAX783
data sheet.
__________Applications Information
Low-Voltage (6-Cell) Operation
The standard application circuit can be configured to
accept input voltages from 5.5V to 12V by changing
the oscillator frequency to 200kHz and increasing the
+5V filter capacitor to 660µF. This allows stable opera-
tion at 5V loads up to 2A (the 3.3V side requires no
changes and still delivers 3A).
V+
R10
OPEN
3.3V
OUT
C7 C12
150µF 150µF
10V 10V
ON3
ON5
SHDN
D1
D2
R1
0.025Ω
SW1A
C10
C1
33µF
33µF
35V
35V
VL (5V)
R9
23
22
1k
V+
VL
6
VH
C2
4.7µF
D2
C5
0.1µF
25 BST3
D2
18
BST5
C4
0.1µF
N1
L1
10µH
27
DH3
26
LX3
DH5 16
LX5 17
N2 L2
10µH
R2
0.025Ω
5V
OUT
D1 N3
1N5819
24
DL3
19
DL5
N4
D3
1N5819
C6
330µF
10V
SW1C
SW1B
1
MAX786
15
CS3
CS5
28
FB3
FB5 21
REF 10
3
ON3
13
ON5
12
SHDN
4 D1
5 D2
11
SYNC
8
Q1
7
Q2
14
SS5
SS3 GND PGND
2 9 20
C9
0.01µF
R6 R5 R8 R7 R4
1M 1M 1M 1M 1M
C3
R3
1µF
1M
20V
C8
0.01µF
N1 – N4 = Si9410DY
D2 = BAW56L OR TWO 1N4148s
VREF (3.3V)
SW1D SYNC
Q1
Q2
Figure 6. MAX786 EV Kit Schematic
16 ______________________________________________________________________________________
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