MAX1540 Datasheet, PDF (15/49 Pages) Maxim Integrated Products – Dual Step-Down Controllers with Saturation Protection, Dynamic Output, and Linear Regulator

Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
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
5A
A
0
2.5V
B
0.67V
C
0.47V
7.5A
D
0
20µs/div
A. I_OUT2 = 0 TO 5A, 5A/div C. ILIM, 200mV/div
B. 2.5V OUTPUT, 200mV/div D. INDUCTOR CURRENT, 5A/div
LSAT = REF, L = 3.3µH 3.5A
INDUCTOR-SATURATION PROTECTION
(∆V_ILIM = 400mV)
MAX1540 toc26
5A
A
0
2.5V
B
1.5V
5V
C
0.67V
0.27V
D
5A
E
0
20µs/div
A. I_OUT2 = 0 TO 5A, 5A/div
B. 2.5V OUTPUT, 1V/div
C. PGOOD, 5V/div
D. ILIM, 400mV/div
E. INDUCTOR CURRENT, 5A/div
LSAT = REF, L = 3.3µH 3.5A
MAX1541
DYNAMIC OUTPUT-VOLTAGE TRANSITION
(CREFIN1 = 100pF)
MAX1540 toc27
5A
A
0
1.5V
B
1.5V
1V
C
5V
5A
D
0
E
-5A
40µs/div
A. GATE, 5V/div
D. PGOOD1, 5V/div
B. OUT1 (1.0V TO 1.5V), 0.5V/div E. INDUCTOR CURRENT, 5A/div
C. REFIN1, 0.5V/div
200mA LOAD, SKIP = GND
MAX1541
DYNAMIC OUTPUT-VOLTAGE TRANSITION
(CREFIN1 = 1nF)
MAX1540 toc28
5A
A
0
1.5V
B
1.5V
1V
C
5V
D
5A
0
E
-5A
100µs/div
A. GATE, 5V/div
D. PGOOD1, 5V/div
B. OUT1 (1.0V TO 1.5V), 0.5V/div E. INDUCTOR CURRENT, 5A/div
C. REFIN1, 0.5V/div
200mA LOAD, SKIP = GND
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