MAX1533 Datasheet, PDF (11/38 Pages) Maxim Integrated Products – High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers

High-Efficiency, 5x Output, Main Power-Supply
Controllers for Notebook Computers
Typical Operating Characteristics (continued)
(MAX1537 circuit of Figure 1, V_IN = 12V, LDO5 = V_CC = 5V, SKIP = GND, FSEL = REF, T_A = +25°C, unless otherwise noted.)
DELAYED STARTUP WAVEFORM
(LIGHT LOAD)
MAX1533/37 toc16
3.3V
0
A
5V
B
0
3.3V
C
0
D
0
2ms/div
A. ON5, 5V/div
B. 5V OUTPUT, 2V/div
C. 3.3V OUPUT, 2V/div
D. PGOOD, 2V/div
100Ω LOAD ON OUT5 AND OUT3, ON3 = REF
STARTUP WAVEFORM (HEAVY LOAD)
MAX1533/37 toc17
3.3V
A
0
4V
2V
B
0
2.5A
C
0
5V
D
E
0
400µs/div
A. ON5, 5V/div
B. 5V OUTPUT, 2V/div
C. INDUCTOR CURRENT, 5A/div
D. LDO5, 1V/div
E. DL5, 5V/div
1.0Ω LOAD
SHUTDOWN WAVEFORM (NO LOAD)
MAX1533/37 toc18
2V
A
0
5V
B
0
5V
C
0
3.3V
0
D
5V
E
0
0
F
2ms/div
A. SHDN, 5V/div
D. 3.3V OUTPUT, 5V/div
B. 5V OUTPUT, 5V/div E. DL3, 5V/div
C. DL5, 5V/div
F. PGOOD, 5V/div
ON3 = ON5 = V_CC, OVP = GND
SHUTDOWN WAVEFORM (1Ω LOAD)
MAX1533/37 toc19
2V
A
0
5V
B
5V
C
5A
D
0
5V
E
0
100µs/div
A. SHDN, 5V/div
B. LDO5, 2V/div
C. 5V OUTPUT, 2V/div
D. INDUCTOR CURRENT, 5A/div
E. DL5, 5V/div
ON3 = ON5 = V_CC, OVP = GND
5V OUTPUT LOAD TRANSIENT
(FORCED-PWM)
MAX1533/37 toc20
4A
A
0
3.3V OUTPUT LOAD TRANSIENT
(FORCED-PWM)
MAX1533/37 toc21
4A
A
0
5V
B
3.3V
B
4A
4A
C
0
C
0
12V
12V
D
D
0
0
40µs/div
A. I_OUT5 = 0.2A TO 4A, 5A/div
B. V_OUT5 = 5.0V, 100mV/div
C. INDUCTOR CURRENT, 5A/div
D. LX5, 10V/div
SKIP = V_CC
40µs/div
A. I_OUT3 = 0.2A TO 4A, 5A/div
B. V_OUT3 = 3.3V, 100mV/div
C. INDUCTOR CURRENT, 5A/div
D. LX3, 10V/div
SKIP = V_CC
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