MAX786CAI+T Maxim Integrated Products, MAX786CAI+T Datasheet - Page 16

• Manufacturer Part Number: MAX786CAI+T
• Description: IC CNTRLR PWR SUP DL 28SSOP
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck)r

Specifications of MAX786CAI+T

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 3.3V, 5V
• Current - Output: 3A
• Frequency - Switching: 200kHz, 300kHz
• Voltage - Input: 5.5 ~ 30 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Power - Output: 762mW
• Output Voltage: 3.3 V, 3.45 V, 3.6 V
• Input Voltage: 5.5 V to 30 V
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Dual-Output Power-Supply
Controller for Notebook Computers
Table 3. EV Kit Power-Supply Controls (SW1)
Figure 6. MAX786 EV Kit Schematic
16
SWITCH
1
2
3
4
3.3V
OUT
V+
ON3
ON5
D1
SHDN
D2
______________________________________________________________________________________
OPEN
150 F
R10
10V
C7
NAME
SHDN
SYNC
ON3
ON5
150 F
C12
10V
Enable shutdown
SW1A
0.025
power supply
power supply
Enable 3.3V
Enable 5.0V
R1
FUNCTION
Oscillator
mode
33 F
35V
C1
1N5819
R9
1k
10 H
SW1B
L1
D1
SW1C
1M
R6
SETTING
1M
R5
3.3V ON
Operate
N3
200kHz
N1
5V ON
1M
R8
ON
0.1 F
1M
R7
C5
1M
D2
R4
0.01 F
SETTING
Shutdown
3.3V OFF
5V OFF
300kHz
25
27
26
28
13
12
24
6
1
3
4
5
C9
OFF
SS3 GND PGND
VH
BST3
DH3
LX3
DL3
CS3
FB3
ON3
ON5
SHDN
D1
D2
2
V+
MAX786
23
9
20
VL
SYNC
BST5
DH5
CS5
DL5
Other ways to shut down the MAX786 are suggested
in the applications section of the MAX782/MAX783
data sheet.
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).
LX5
FB5
REF
22
SS5
__________Applications Information
Q1
Q2
14
18
16
17
19
15
21
10
11
8
7
D2
R3
1M
C8
0.01 F
C4
0.1 F
C3
1 F
20V
Low-Voltage (6-Cell) Operation
N1 – N4 = Si9410DY
D2 = BAW56L OR TWO 1N4148s
N2
N4
10 H
L2
D3
1N5819
C2
4.7 F
0.025
R2
SW1D
C10
33 F
35V
VREF (3.3V)
SYNC
VL (5V)
5V
OUT
Q1
Q2
C6
330 F
10V