MAX1540A Datasheet, PDF (14/49 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.)
LINEAR-REGULATOR
LINE TRANSIENT
MAX1540A toc21
20V
A
10V
20V
B
10V
3.8V
3.3V
C
2.8V
200μs/div
A. INPUT (V_IN), 10V/div
B. LDOIN (10V TO 20V), 10V/div
20mA LOAD
C. LDOOUT (3.3V), 500mV/div
OUTPUT OVERLOAD
(UVP DISABLED)
20A
MAX1540A toc22
10A
A
0
5A
B
0
2.5V
C
0
5V
D
0
40μs/div
A. LOAD (0 TO 150mΩ), 10A/div C. 2.5V OUTPUT, 2V/div
B. INDUCTOR CURRENT, 10A/div D. PGOOD2, 5V/div
OVP/UVP = OPEN OR GND
OUTPUT OVERLOAD
(UVP ENABLED)
20A
MAX1540A toc23
10A
A
0
5A
0
B
5V
C
0
2.5V
D
5V
E
0
20μs/div
A. LOAD (0 TO 150mΩ), 10A/div D. 2.5V OUTPUT, 2V/div
B. INDUCTOR CURRENT, 10A/div E. PGOOD2, 5V/div
C. DL2, 5V/div
OVP/UVP = V_CC OR REF
INDUCTOR-SATURATION PROTECTION
(LSAT DISABLED)
MAX1540A toc24
5A
A
0
2.5V
B
0.67V
C
7.5A
D
0
20μs/div
A. I_OUT2 = 0 TO 5A, 5A/div C. ILIM, 100mV/div
B. 2.5V OUTPUT, 200mV/div D. INDUCTOR CURRENT, 5A/div
LSAT = GND, L = 3.3μH 3.5A
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