Rainbow Electronics MAX1813 - Manual (Page 10)

MAX1813
Dynamically-Adjustable, Synchronous Step-Down
Controller with Integrated Voltage Positioning
10 ______________________________________________________________________________________
40 µs/div
OUTPUT OVERLOAD WAVEFORM
40A
0
A
B
MAX1813 toc18
0
-100mV
20A
100mV
A. I OUT = 0 TO 40A, (0 to 35m Ω), 20A/div
B. V OUT = 1.4V, 1V/div
C. VPCS, 200mV/div
ILIM = V
CC
1.4V
C
40 µs/div
DYNAMIC TRANSITION
(ZMODE TRANSITION)
5V
0
A
B
MAX1813 toc19
-10A
1.2V
5V
1.3V
A. V ZMODE = 0 TO 5V, 5V/div
B. PGOOD, 5V/div
C. INDUCTOR CURRENT, 10A/div
D. V
OUT = 1.3V TO 1.15V, I OUT = 1A, 100mV/div
CODE = V CC
10A
0
1.1V
C
D
40 µs/div
DYNAMIC TRANSITION
(SUS TRANSITION)
5V
0
A
B
MAX1813 toc20
-5A
1.3V
5V
-15A
A. V SUS = 0 TO 5V, 5V/div
B. PGOOD, 5V/div
C. INDUCTOR CURRENT, 10A/div
D. V
OUT = 1.3V TO 0.85V, I OUT = 1A, 500mV/div
CODE = V CC
15A
5A
0.85V
C
D
Typical Operating Characteristics (continued)
(Circuit from Figure 1, components from Table 2, T A = +25 °C, unless otherwise noted.)
20 µs/div
LOAD TRANSIENT
(PWM MODE)
20A
0
A
B
MAX1813 toc15
1.41V
1.31V
10A
1.36V
A. I OUT = 0.3A TO 22A, 10A/div
B. V OUT = 1.4V, 50mV/div
SKP/SDN = FLOAT
20 µs/div
LOAD TRANSIENT
(SKIP MODE)
20A
0
A
B
MAX1813 toc16
1.41V
1.31V
10A
1.36V
A. I OUT = 0.3A TO 22A, 10A/div
B. V OUT = 1.4V, 50mV/div
SKP/SDN = V CC
20 µs/div
LOAD TRANSIENT
(VOLTAGE POSITIONING DISABLED)
20A
0
A
B
MAX1813 toc17
1.46V
1.36V
10A
1.41V
A. I OUT = 0.3A to 22A, 10A/div
B. V OUT = 1.4V, 50mV/div
SKP/SDN = FLOAT