MAX1540A Datasheet, PDF (13/49 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.)
SHUTDOWN WAVEFORM
(DISCHARGE MODE ENABLED)
MAX1540A toc17
3.3V
A
0
2.5V
B
0
0
C
5V
D
0
5V
E
0
1ms/div
A. ON2, 5V/div
B. OUT2, 2V/div
C. INDUCTOR CURRENT,
2A/div
D. DL2, 5V/div
E. PGOOD2, 5V/div
100Ω LOAD, OVP/UVP = V_CC OR OPEN
2.5V OUTPUT LOAD TRANSIENT
(FORCED PWM)
MAX1540A toc18
4A
A
0
2.6V
2.5V
B
2.4V
4A
C
0
12V
D
0
40μs/div
A. I_OUT2 = 0 TO 4A, 5A/div C. INDUCTOR CURRENT, 5A/div
B. V_OUT2 = 2.5V, 100mV/div D. LX2, 10V/div
SKIP = V_CC
2.5V OUTPUT LOAD TRANSIENT
(PULSE SKIPPING)
MAX1540A toc19
4A
A
0
2.6V
2.5V
B
2.4V
4A
C
0
12V
D
0
40μs/div
A. I_OUT2 = 0.1A TO 4A, 5A/div C. INDUCTOR CURRENT, 5A/div
B. V_OUT2 = 2.5V, 100mV/div D. LX2, 10V/div
SKIP = GND
100mA
0
3.4V
3.3V
3.2V
LINEAR-REGULATOR
LOAD TRANSIENT
MAX1540A toc20
A
B
100μs/div
A. I_LDOOUT = 1mA TO 100mA, 50mA/div
B. V_LDOOUT = 3.3V, 100mV/div
SKIP = GND
______________________________________________________________________________________ 13