MAX8745 Maxim Integrated Products, MAX8745 Datasheet - Page 15

• Manufacturer Part Number: MAX8745
• Description: (MAX8744 / MAX8745) Main Power-Supply Controllers
• Manufacturer: Maxim Integrated Products

Table 1. Component Selection for Standard Applications
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INPUT VOLTAGE
C
5V OUTPUT
C
L5/T5 Inductor/Transformer
N
N
3V OUTPUT
C
L3, Inductor
N
N
IN_
OUT5
H5
L5
OUT3
H3
L3
PIN
Low-Side MOSFET
Low-Side MOSFET
, Input Capacitor
High-Side MOSFET
High-Side MOSFET
EP
31
32
, Output Capacitor
, Output Capacitor
COMPONENT
Supply Controllers for Notebook Computers
High-Efficiency, Quad Output, Main Power-
NAME
OUTA
FBA
EP
______________________________________________________________________________________
Auxiliary LDO Feedback Input. Connect a resistive voltage-divider from OUTA to analog ground to
adjust the auxiliary linear-regulator output voltage. FBA regulates at 1V.
Adjustable Auxiliary Linear-Regulator Output. Bypass OUTA to GND with 1µF or greater capacitor
(1µF/25mA). When DRVA < OUTA, the secondary feedback control triggers the DL5 for 1µs forcing
the controller to recharge the auxiliary storage capacitor. When DRVA exceeds 25V, the
MAX8744/MAX8745 enable a 10mA shunt on OUTA, preventing the storage capacitor from rising to
unsafe levels due to the transformer’s leakage inductance. Pulling ONA high enables the linear-
regulator driver and the secondary feedback control.
Exposed Pad. Connect the exposed backside pad to analog ground.
V
(3) 10µF, 25V
Taiyo Yuden TMK432BJ106KM
2x 100µF, 6V, 35mΩ
Sanyo 6TPE100MAZB
6.8µH, 6.4A, 18mΩ (max) 1:2
Sumida 4749-T132
Fairchild Semiconductor
FDS6612A
International Rectifier
IRF7807V
Fairchild Semiconductor
FDS6670S
International Rectifier
IRF7807VD1
2x 150µF, 4V, 35mΩ
Sanyo 4TPE150MAZB
5.7µH, 9A, 8.5mΩ
TDK RLF12560T-5R6N9R2
Fairchild Semiconductor
FDS6612A
International Rectifier
IRF7807V
Fairchild Semiconductor
FDS6670S
International Rectifier
IRF7807VD1
IN
= 7V TO 24V
3.3V AT 6A
5V AT 5A
300kHz
FUNCTION
Pin Description (continued)
V
(3) 10µF, 25V
Taiyo Yuden TMK432BJ106KM
2x 100µF, 6V, 35mΩ
Sanyo 6TPE100MAZB
—
Fairchild Semiconductor
FDS6612A
International Rectifier
IRF7807V
Fairchild Semiconductor
FDS6670S
International Rectifier
IRF7807VD1
2x 100µF, 6V, 35mΩ
Sanyo 6TPE100MAZB
3.9µH, 6.5A, 15mΩ
Sumida CDRH124-3R9NC
Fairchild Semiconductor
FDS6612A
International Rectifier
IRF7807V
Fairchild Semiconductor
FDS6670S
International Rectifier
IRF7807VD1
IN
= 7V TO 24V
3.3V AT 5A
5V AT 3A
500kHz
15