Analog Devices Linear ADI Power LTM4681 Manual page 13

TYPICAL PERFORMANCE CHARACTERISTICS
Single Channel Load Transient
Response (10A) to (20A) Load Step,
10A/µs 12V to 0.9V
IN
50mV/DIV
LOAD STEP
10A/DIV
200 S/DIV
FIGURE 48 CIRCUIT, 12V TO 0.9V, FREQ = 350kHz
C = 470µF ×3 POSCAP , 100µF ×5 CERAMIC
OUT
R = 11k, EA-GM = 4.36ms
COMP
COMPna = 2.2nF , COMPnb = 150pF
ILIM RANGE HIGH, V RANGE LOW
OUT
Single Channel Load Transient
Response (10A) to (20A)
Load Step, 10A/µs V
V
OUT
100mV/DIV
LOAD STEP
10A/DIV
FIGURE 48 CIRCUIT, 12V TO 2.5V, FREQ = 500kHz
C = 470µF ×1 POSCAP , 100µF ×1 CERAMIC
OUT
R
COMP
COMPna = 2.2nF , COMPnb = 220pF
ILIM RANGE HIGH, V
Single Channel Load Transient
Response (10A) to (20A)
Load Step, 10A/µs V
V
OUT OUT
100mV/DIV
LOAD STEP
10A/DIV
4681 G05
FIGURE 48 CIRCUIT, 12V TO 1.2V, FREQ = 350kHz
C
OUT
R
COMP
COMPna = 2.2nF , COMPnb = 150pF
ILIM RANGE HIGH, V
= 12V,
IN
= 2.5V, f = 500kHz
SW
200µs/DIV
4681 G08
= 6k, EA-GM = 2.35ms,
RANGE LOW
OUT
For more information
T = 25°C, unless otherwise noted.
A
= 12V,
IN
= 1.2V, f = 350kHz
SW
200µs/DIV
4681 G06
= 470µF ×2 POSCAP , 100µF ×2 CERAMIC
= 7k, EA-GM = 4.36ms
RANGE LOW
OUT
Single Channel Load Transient
Response (10A) to 1 (20A)
Load Step, 10A/µs V
V
OUT
200mV/DIV
LOAD STEP
5A/DIV
FIGURE 48 CIRCUIT, 12V TO 3.3V, FREQ = 500kHz
C
OUT
R
COMP
COMPna = 2.2nF , COMPnb = 100pF
ILIM RANGE HIGH, V
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LTM4681
Single Channel Load Transient
Response (10A) to (20A)
Load Step, 10A/µs V
V = 1.5V, f
OUT SW
100mV/DIV
LOAD STEP
5A/DIV
200µs/DIV
FIGURE 48 CIRCUIT, 12V TO 1.5V, FREQ = 350kHz
C = 470µF ×2 POSCAP , 100µF ×2 CERAMIC
OUT
R = 7k, EA-GM = 3.69ms
COMP
COMPna = 2.2nF , COMPnb = 150pF
ILIM RANGE HIGH, V
OUT
= 12V,
IN
= 3.3V, f = 500kHz
SW
200µs/DIV
4681 G09
= 470µF ×1 POSCAP , 100µF ×1 CERAMIC
= 11k, EA-GM = 1.68ms,
RANGE HIGH
OUT
= 12V,
IN
= 350kHz
4681 G07
RANGE LOW
Rev. A
13