Typical operating characteristics (continued) – Rainbow Electronics MAX1545 User Manual
Page 11
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
IN
= 12V, V
CC
= V
DD
= 5V, SHDN = SKIP = V
CC
, D0–D4 set for 1.5V (SUS = GND), S0–S1 set
for 1V (SUS = V
CC
), OFS = GND, T
A
= +25°C, unless otherwise specified.)
MAX1519/MAX1545
Dual-Phase, Quick-PWM Controllers for
Programmable CPU Core Power Supplies
______________________________________________________________________________________
11
SOFT-START
MAX1519 toc19
5V
0A
0A
0V
10A
0V
1.5V
B
C
D
A
100
µs/div
A. SHDN, 5V/div
B. 1.5V OUTPUT, 1V/div
C. I
L1
, 10A/div
D. I
L2
, 10A/div
R
LOAD
= 75m
Ω, R
TIME
= 64.9k
Ω
SOFT-SHUTDOWN
MAX1519 toc20
5V
10A
0A
0V
10A
0V
1.5V
B
C
D
A
200
µs/div
A. SHDN, 5V/div
B. 1.5V OUTPUT, 1V/div
C. I
L1
, 10A/div
D. I
L2
, 10A/div
R
LOAD
= 75m
Ω, R
TIME
= 64.9k
Ω
1.50V LOAD TRANSIENT
(10A TO 50A LOAD)
MAX1519 toc21
50A
20A
0A
0A
20A
10A
1.5V
B
C
D
A
20
µs/div
A. LOAD CURRENT, (I
LOAD
= 10A TO 50A), 50A/div
B. OUTPUT VOLTAGE (1.5V NO LOAD), 100mV/div
C. I
L1
, 10A/div
D. I
L2
, 10A/div
POWER-UP SEQUENCE
MAX1519 toc18
5V
0V
0V
5V
0V
2V
1V
B
C
A
1ms/div
A. SHDN, 5V/div
B. 1.5V OUTPUT, 1V/div
C. VROK, 5V/div
R
TIME
= 64.9k
Ω