Rainbow Electronics MAX1541 - Manual (Page 15)

MAX1540/MAX1541
Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
______________________________________________________________________________________ 15
Typical Operating Characteristics (continued)
(MAX1541 Circuit of Figure 12, V IN = 12V, V DD = V CC = 5V, SKIP = GND, TON = REF, T A = +25°C, unless otherwise noted.)
INDUCTOR-SATURATION PROTECTION
( ∆V
ILIM = 200mV)
MAX1540 toc25
0
2.5V
B
D
C
A
20 µs/div
5A
7.5A
A. I OUT2 = 0 TO 5A, 5A/div
B. 2.5V OUTPUT, 200mV/div
LSAT = REF, L = 3.3 µH 3.5A
C. ILIM, 200mV/div
D. INDUCTOR CURRENT, 5A/div
0.67V
0
0.47V
INDUCTOR-SATURATION PROTECTION
( ∆V
ILIM = 400mV)
MAX1540 toc26
0
2.5V
1.5V
B
D
C
A
20 µs/div
5A
5A
A. I
OUT2
= 0 TO 5A, 5A/div
B. 2.5V OUTPUT, 1V/div
C. PGOOD, 5V/div
LSAT = REF, L = 3.3 µH 3.5A
D. ILIM, 400mV/div
E. INDUCTOR CURRENT, 5A/div
5V
0
0.67V
E
0.27V
MAX1541
DYNAMIC OUTPUT-VOLTAGE TRANSITION
(C REFIN1 = 100pF)
MAX1540 toc27
-5A
1.5V
B
D
C
A
40 µs/div
5A
5A
A. GATE, 5V/div
B. OUT1 (1.0V TO 1.5V), 0.5V/div
C. REFIN1, 0.5V/div
200mA LOAD, SKIP = GND
D. PGOOD1, 5V/div
E. INDUCTOR CURRENT, 5A/div
1.5V
0
1V
E
5V
0
MAX1541
DYNAMIC OUTPUT-VOLTAGE TRANSITION
(C
REFIN1
= 1nF)
MAX1540 toc28
-5A
1.5V
B
D
C
A
100 µs/div
5A
5A
A. GATE, 5V/div
B. OUT1 (1.0V TO 1.5V), 0.5V/div
C. REFIN1, 0.5V/div
200mA LOAD, SKIP = GND
D. PGOOD1, 5V/div
E. INDUCTOR CURRENT, 5A/div
1.5V
0
1V
E
5V
0