MAX8745 Maxim Integrated Products, MAX8745 Datasheet - Page 12

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

High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
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12
(Circuit of Figure 1, V
3.35V
3.25V
3.3V
12V
2A
0
0
0
______________________________________________________________________________________
A. SKIP, 5V/div
B. 3.3V OUTPUT (V
0.5A LOAD
100mV/div
100mA
5.00V
4.95V
SKIP TRANSITION
0
OUT3
A. LDO5 OUTPUT, 50mV/div
B. LOAD CURRENT, 50mA/div
40μs/div
IN
),
= 12V, SKIP = GND, FSEL = REF, T
LDOH5 LOAD TRANSIENT
C. INDUCTOR CURRENT,
D. LX3, 10V/div
2A/div
MAX8744 toc22
20μs/div
A
B
C
D
MAX8744 toc25
3.3
5V
5V
5V
0
0
0
0
Typical Operating Characteristics (continued)
A.PGOOD3, 5V/div
B. 3.3V OUTPUT (V
FAULT PROTECTION (MAX8744 ONLY)
2V/div
A
B
OUTPUT OVERVOLTAGE
A
= +25°C, unless otherwise noted.)
OUT3
1ms/div
),
C. 5V OUTPUT (V
D. DL3, 5V/div
5V/div
MAX8744 toc23
15.0V
14.5V
12.0V
11.9V
5V
OUT5
0
A
B
C
D
),
A. LOAD FET GATE, 5V/div
B. AUX LDO INPUT, 0.5V/div
0 TO 150mA LOAD TRANSIENT
3.3V
12V
5V
5V
LDOHA LOAD TRANSIENT
0
0
0
0
A. LOAD FET GATE, 5V/div
B. 3.3V OUTPUT (V
30mΩ MOSFET
(SHORT-CIRCUIT) FAULT PROTECTION
20μs/div
OUTPUT UNDERVOLTAGE
C. AUX LDO OUTPUT (V
OUT3
0.1V/div
20μs/div
), 1V/div
MAX8744 toc26
C. DL3, 5V/div
D. DH3, 10V/div
A
B
C
MAX8744 toc24
OUTA
),
A
B
C
D