Datasheet

MAX1533A/MAX1537A
High-Efficiency, 5x Output, Main Power-Supply
Controllers for Notebook Computers
12 ______________________________________________________________________________________
3.3V OUTPUT LOAD TRANSIENT
(PULSE SKIPPING)
MAX1533/37 toc22
40μs/div
4A
0
A
B
C
D
3.3V
4A
0
12V
0
B. V
OUT3
= 3.3V, 100mV/div
C. INDUCTOR CURRENT, 5A/div
D. LX3, 10V/div
A. I
OUT3
= 0.2A TO 4A, 5A/div
SKIP = GND
OUTPUT OVERLOAD
(UVP ENABLED)
MAX1533/37 toc23
4μs/div
5V
0
A
B
C
3.3V
0
7A
12V
B. 3.3V OUTPUT, 3.3V/div
C. LOAD (0 TO 30A), 20A/div
A. PGOOD2, 5V/div
D
E
30A
0
0
0
D. INDUCTOR CURRENT, 10A/div
E. LX3, 20V/div
LDO5 LOAD TRANSIENT
MAX1533/37 toc24
20μs/div
5V
0
A
B
C
100mA
0
5.0V
4.95V
B. I
LDO5
= 1mA TO 100mA, 100mA/div
C. LDO5, 50m/div
ON3 = ON5 = GND
A. CONTROL SIGNAL, 5V/div
LDO5 LINE TRANSIENT
MAX1533/37 toc25
20μs/div
20V
A
B
15V
4.95V
B. LDO5 OUTPUT VOLTAGE, 50mV/div
A. INPUT VOLTAGE (V
IN
= 7V TO 20V), 5V/div
10V
5.05V
5.00V
ON3 = ON5 = GND, I
LDO5
= 20mA
5V
AUXILIARY LINEAR-REGULATOR
LOAD TRANSIENT
MAX1533/37 toc26
100μs/div
120mA
A
B
10mA
11.90V
B. INA, 1V/div
A. I
LDOA
= 10mA TO 100mA, 100mA/div
14V
13V
11.96V
C. LDOA, 50mV/div
C
INA = VOLTAGE GENERATED BY SECONDARY
TRANSFORMER WINDING
Typical Operating Characteristics (continued)
(MAX1537A circuit of Figure 1, V
IN
= 12V, LDO5 = V
CC
= 5V, SKIP = GND, FSEL = REF, T
A
= +25°C, unless otherwise noted.)