MAX8744A View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX8744A
Maxim Integrated
MAX8744A Datasheet PDF : 36 Pages
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High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = 12V, SKIP = GND, FSEL = REF, TA = +25°C, unless otherwise noted.)
SMPS DELAYED STARTUP SEQUENCE
SMPS DELAYED STARTUP SEQUENCE
SOFT-START WAVEFORM
3.3V
0
MAX8744A toc16
A
3.3V
0
(ON3 = REF)
MAX8744A toc17
3.3V
A
0
(ON5 = REF)
MAX8744A toc18
A
5V
5V
B
5V
B
B
0
0
0
0
C
0
C
0
C
12V
3.3V
3.3V
0
D
0
D
0
D
5A
0
E
0
E
0
E
400μs/div
A. ON3 AND ON5, 5V/div
B. 5V OUTPUT (VOUT5), 5V/div
C. PGOOD5, 5V/div
D. AUX LDO OUTPUT
(VOUTA), 10V/div
E. L5 INDUCTOR CURRENT,
5A/div
1ms/div
A. ON5, 5V/div
B. 5V OUTPUT (VOUT5), 5V/div
C. PGOOD5, 5V/div
ON3 = REF
D. 3.3V OUTPUT (VOUT3),
5V/div
E. PGOOD3, 5V/div
1ms/div
A. ON3, 5V/div
B. 5V OUTPUT (VOUT5), 5V/div
C. PGOOD5, 5V/div
ON5 = REF
D. 3.3V OUTPUT (VOUT3),
5V/div
E. PGOOD3, 5V/div
SMPS SHUTDOWN WAVEFORM
MAX8744A toc19
3.3V
5A
A
1A
5.1V
5V
0
B
5.0V
OUT5 LOAD TRANSIENT
MAX8744A toc20
A
B
3A
1A
3.35V
3.30V
OUT3 LOAD TRANSIENT
MAX8744A toc21
A
B
0
C
4.9V
5A
3.25V
3.3V
1A
C
3A
C
0
D
1A
5V
0
12V
E
12V
D
D
0
0
1ms/div
A. SHDN, 5V/div
B. 5V OUTPUT (VOUT5), 5V/div
C. PGOOD5, 5V/div
NO LOAD
D. 3.3V OUTPUT (VOUT3),
5V/div
E. PGOOD3, 5V/div
20μs/div
A. IOUT5 = 1A TO 5A, 5A/div
B. VOUT5, 50mV/div
C. INDUCTOR CURRENT,
5A/div
D. LX5, 10V/div
20μs/div
A. IOUT3 = 1A TO 3A, 5A/div
B. VOUT3, 50mV/div
C. INDUCTOR CURRENT,
5A/div
D. LX3, 10V/div
______________________________________________________________________________________ 11
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