Rainbow Electronics MAX1541 - Manual (Page 14)

MAX1540/MAX1541
Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
14 ______________________________________________________________________________________
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.)
LINEAR-REGULATOR
LINE TRANSIENT
MAX1540 toc21
20V
10V
20V
10V
3.8V
3.3V
2.8V
C
A
B
200 µs/div
A. INPUT (V IN ), 10V/div
B. LDOIN (10V TO 20V), 10V/div
C. LDOOUT (3.3V), 500mV/div
20mA LOAD
OUTPUT OVERLOAD
(UVP DISABLED)
MAX1540 toc22
20A
0
2.5V
10A
B
D
C
A
40 µs/div
0
5A
0
5V
A. LOAD (0 TO 150m Ω), 10A/div
B. INDUCTOR CURRENT, 10A/div
OVP/UVP = OPEN OR GND
C. 2.5V OUTPUT, 2V/div
D. PGOOD2, 5V/div
0
OUTPUT OVERLOAD
(UVP ENABLED)
MAX1540 toc23
20A
0
2.5V
10A
B
D
C
A
20 µs/div
0
5A
0
5V
A. LOAD (0 TO 150m Ω), 10A/div
B. INDUCTOR CURRENT, 10A/div
C. DL2, 5V/div
OVP/UVP = V CC OR REF
D. 2.5V OUTPUT, 2V/div
E. PGOOD2, 5V/div
E
0
5V
INDUCTOR-SATURATION PROTECTION
(LSAT DISABLED)
MAX1540 toc24
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 = GND, L = 3.3 µH 3.5A
C. ILIM, 100mV/div
D. INDUCTOR CURRENT, 5A/div
0.67V
0