Datasheet

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