MAX1533 Datasheet, PDF (12/38 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.)
3.3V OUTPUT LOAD TRANSIENT
(PULSE SKIPPING)
MAX1533/37 toc22
4A
A
0
3.3V
B
4A
0
C
12V
D
0
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 = GND
OUTPUT OVERLOAD
(UVP ENABLED)
MAX1533/37 toc23
LDO5 LOAD TRANSIENT
MAX1533/37 toc24
5V
0
A
5V
A
3.3V
B
0
0
100mA
30A
B
C
0
0
7A
0
D
5.0V
C
12V
0
E
4.95V
4µs/div
A. PGOOD2, 5V/div
D. INDUCTOR CURRENT, 10A/div
B. 3.3V OUTPUT, 3.3V/div E. LX3, 20V/div
C. LOAD (0 TO 30A), 20A/div
20µs/div
A. CONTROL SIGNAL, 5V/div
B. I_LDO5 = 1mA TO 100mA, 100mA/div
C. LDO5, 50m/div
ON3 = ON5 = GND
20V
15V
10V
5V
5.05V
5.00V
4.95V
LDO5 LINE TRANSIENT
MAX1533/37 toc25
A
B
20µs/div
A. INPUT VOLTAGE (V_IN = 7V TO 20V), 5V/div
B. LDO5 OUTPUT VOLTAGE, 50mV/div
ON3 = ON5 = GND, I_LDO5 = 20mA
120mA
10mA
AUXILIARY LINEAR-REGULATOR
LOAD TRANSIENT
MAX1533/37 toc26
A
14V
B
13V
11.96V
11.90V
C
100µs/div
A. I_LDOA = 10mA TO 100mA, 100mA/div
B. INA, 1V/div
C. LDOA, 50mV/div
INA = VOLTAGE GENERATED BY SECONDARY
TRANSFORMER WINDING
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