MAX8745 Maxim Integrated Products, MAX8745 Datasheet - Page 11

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

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(Circuit of Figure 1, V
3.3V
12V
3.3V
3.3V
5V
5A
5V
5V
0
0
0
0
0
0
0
0
0
A. ON3 AND ON5, 5V/div
B. 5V OUTPUT (V
C. PGOOD5, 5V/div
A. SHDN, 5V/div
B. 5V OUTPUT (V
C. PGOOD5, 5V/div
NO LOAD
SMPS SHUTDOWN WAVEFORMS
Supply Controllers for Notebook Computers
SOFT-START WAVEFORM
High-Efficiency, Quad Output, Main Power-
OUT5
OUT5
400μs/div
1ms/div
), 5V/div
), 5V/div
______________________________________________________________________________________
IN
= 12V, SKIP = GND, FSEL = REF, T
D. AUX LDO OUTPUT
E. L5 INDUCTOR CURRENT,
D. 3.3V OUTPUT (V
E. PGOOD3, 5V/div
(V
5A/div
5V/div
OUTA
MAX8744 toc16
MAX8744 toc19
), 10V/div
A
B
C
D
E
A
B
C
D
E
OUT3
),
3.3V
3.3V
5.1V
5.0V
4.9V
12V
5V
5A
1A
5A
1A
Typical Operating Characteristics (continued)
0
0
0
0
0
0
A. ON5, 5V/div
B. 5V OUTPUT (V
C. PGOOD5, 5V/div
ON3 = REF
A. I
B. V
SMPS DELAYED STARTUP SEQUENCE
OUT5
OUT5
= 1A TO 5A, 5A/div
, 50mV/div
OUT5 LOAD TRANSIENT
A
= +25°C, unless otherwise noted.)
OUT5
(ON3 = REF)
20μs/div
1ms/div
), 5V/div
D. 3.3V OUTPUT (V
E. PGOOD3, 5V/div
C. INDUCTOR CURRENT,
D. LX5, 10V/div
5V/div
5A/div
MAX8744 toc17
MAX8744 toc20
A
B
C
D
E
OUT3
A
B
C
D
),
3.35V
3.30V
3.25V
3.3V
3.3V
12V
5V
3A
1A
3A
1A
0
0
0
0
0
0
A. ON3, 5V/div
B. 5V OUTPUT (V
C. PGOOD5, 5V/div
ON5 = REF
SMPS DELAYED STARTUP SEQUENCE
A. I
B. V
OUT3
OUT3
= 1A TO 3A, 5A/div
, 50mV/div
OUT3 LOAD TRANSIENT
(ON5 = REF)
OUT5
1ms/div
20μs/div
), 5V/div
D. 3.3V OUTPUT (V
E. PGOOD3, 5V/div
C. INDUCTOR CURRENT,
D. LX3, 10V/div
5V/div
5A/div
MAX8744 toc18
MAX8744 toc21
A
B
C
D
E
OUT3
11
A
B
C
D
),