Linear ANALOG DEVICES LTM4644EY PBF Series Manual page 5

TYPICAL PERFORMANCE CHARACTERISTICS
3.3V Output Transient Response
V
OUT
50mV/DIV
AC-COUPLED
LOAD STEP
1A/DIV
20µs/DIV
V = 12V, V = 3.3V, I
IN OUT
OUTPUT CAPACITOR = 47µF CERAMIC
Start-Up with 4A Load
I
IN
0.2A/DIV
V
OUT
0.5V/DIV
5ms/DIV
V = 12V, V = 1.5V
IN OUT
INPUT CAPACITOR = 150µF SANYO ELECTROLYTIC
CAPACITOR (OPTIONAL) + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
SOFT-START CAPACITOR = 0.1µF
Recovery to No Load from
Short-Circuit
V
OUT
200mV/DIV
I
OUT
20A/DIV
V = 12V 5µs/DIV
IN
V = 1V
OUT
INPUT CAPACITOR = 22µF SANYO ELECTROLYTIC
CAPACITOR (OPTIONAL) + 2× 22µF CERAMIC CAP .
OUTPUT CAPACITOR = 2× 47µF CERAMIC CAP .
SOFT-START CAPACITOR = 0.1µF
5V Output Transient Response
V
OUT
50mV/DIV
AC-COUPLED
LOAD STEP
1A/DIV
4644 G07
= 3A TO 4A, 1A/µs V
OUT IN
OUTPUT CAPACITOR = 47µF CERAMIC
Short-Circuit with No Load
I
IN
0.5A/DIV
V
OUT
0.5V/DIV
4644 G10
V = 12V, V
IN
INPUT CAPACITOR = 150µF SANYO ELECTROLYTIC
CAPACITOR (OPTIONAL) + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
Output Ripple
5mV/DIV
AC-COUPLED
4644 G13 V
IN
V
OUT
INPUT CAPACITOR = 22µF SANYO ELECTROLYTIC
CAPACITOR (OPTIONAL) + 2× 22µF CERAMIC CAP .
OUTPUT CAPACITOR = 2× 47µF CERAMIC CAP .
SOFT-START CAPACITOR = 0.1µF
20MHz MEASUREMENT BANDWIDTH
For more information
4644 G08
20µs/DIV
= 12V, V = 5V, I = 3A TO 4A, 1A/µs
OUT OUT
4644 G11
20µs/DIV
= 1.5V
OUT
= 12V 500µs/DIV 4644 G14
= 1.5V
www.analog.com
LTM4644/LTM4644-1
Start-Up with No Load
I
IN
0.1A/DIV
V
OUT
0.5V/DIV
5ms/DIV
V = 12V, V = 1.5V
IN OUT
INPUT CAPACITOR = 150µF SANYO ELECTROLYTIC
CAPACITOR (OPTIONAL) + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
SOFT-START CAPACITOR = 0.1µF
Short-Circuit with 4A Load
I
IN
0.5A/DIV
V
OUT
0.5V/DIV
20µs/DIV
V = 12V, V = 1.5V
IN OUT
INPUT CAPACITOR = 150µF SANYO ELECTROLYTIC
CAPACITOR (OPTIONAL) + 22µF CERAMIC CAPACITOR
OUTPUT CAPACITOR = 47µF CERAMIC CAPACITOR
Start Into Pre-Biased Output
V
IN
2V/DIV
V
OUT
1V/DIV
V = 12V 1µs/DIV
IN
V = 5V
OUT
INPUT CAPACITOR = 22µF SANYO ELECTROLYTIC
CAPACITOR (OPTIONAL) + 2× 22µF CERAMIC CAP .
OUTPUT CAPACITOR = 2× 47µF CERAMIC CAP .
SOFT-START CAPACITOR = 0.1µF
4644 G09
4644 G12
4644 G15
Rev. G
5