Datasheet

LTM4649
22
4649f
For more information www.linear.com/LTM4649
APPLICATIONS INFORMATION
Table 3. Output Voltage Response vs Component Matrix (Refer to Figure 18) 0A to 5A Load Step Typical Measured Values
C
IN
(BULK)* VENDORS PART NUMBER
C
IN
(CERAMIC) VENDORS PART NUMBER
C
OUT
(CERAMIC) VENDORS PART NUMBER
150µF, 16V SANYO OSCON 25HVH150MT 22µF, 16V MURATA GRM32ER71C226KE18L 100µF, 6.3V MURATA GRM32ER60J107ME20L
220µF, 4V MURATA GRM31CR60G227M
V
OUT
V
IN
C
IN
(BULK)*
C
IN
(CERAMIC)
C
OUT
(CERAMIC) C
FF
LOAD STEP V
DROOP
V
P-P
RECOVERY
TIME
LOAD STEP
SPEED R
FB
SW FREQ
FREQ
PIN
1V 5V, 12V 120µF* 22µF × 2 100µF × 3 None 75% to 100% 45mV 90mV 40µs 1A/µs 15kΩ 450kHz Float
1.2V 5V, 12V 120µF* 22µF × 2 100µF × 3 None 75% to 100% 50mV 100mV 50µs 1A/µs 10kΩ 450kHz Float
1.5V 5V, 12V 120µF* 22µF × 2 100µF × 3 None 75% to 100% 57mV 114mV 60µs 1A/µs 6.65kΩ 450kHz Float
2.5V 5V 120µF* 22µF × 2 100µF × 3 None 75% to 100% 75mV 150mV 70µs 1A/µs 3.16kΩ 450kHz Float
2.5V 12V 120µF* 22µF × 2 100µF × 3 None 75% to 100% 75mV 150mV 70µs 1A/µs 3.16kΩ 750kHz INTV
CC
3.3V 5V 120µF* 22µF × 2 100µF × 3 None 75% to 100% 95mV 190mV 70µs 1A/µs 2.21kΩ 450kHz Float
3.3V 12V 120µF* 22µF × 2 100µF × 3 None 75% to 100% 95mV 190mV 70µs 1A/µs 2.21kΩ 750kHz INTV
CC
1V 5V, 12V 120µF* 22µF × 2 220µF × 2 None 50% to 100% 70mV 140mV 30µs 1A/µs 15kΩ 450kHz Float
1.2V 5V, 12V 120µF* 22µF × 2 220µF × 2 None 50% to 100% 75mV 150mV 40µs 1A/µs 10kΩ 450kHz Float
1.5V 5V, 12V 120µF* 22µF × 2 220µF × 2 None 50% to 100% 90mV 180mV 40µs 1A/µs 6.65kΩ 450kHz Float
2.5V 5V 120µF* 22µF × 2 220µF × 2 None 50% to 100% 135mV 270mV 50µs 1A/µs 3.16kΩ 450kHz Float
2.5V 12V 120µF* 22µF × 2 220µF × 2 None 50% to 100% 135mV 270mV 50µs 1A/µs 3.16kΩ 750kHz INTV
CC
3.3V 5V 120µF* 22µF × 2 220µF × 2 None 50% to 100% 175mV 350mV 60µs 1A/µs 2.21kΩ 450kHz Float
3.3V 12V 120µF* 22µF × 2 220µF × 2 None 50% to 100% 175mV 350mV 60µs 1A/µs 2.21kΩ 750kHz INTV
CC
*Bulk capacitor is optional if V
IN
has very low input impedance.
Table 4. 1.5V Output
DERATING CURVE V
IN
(V) POWER LOSS CURVE AIR FLOW (LFM) HEAT SINK
θ
JA
(°C/W)
Figures 11, 12 5, 12 Figure 9 0 None 14
Figures 11, 12 5, 12 Figure 9 200 None 12
Figures 11, 12 5, 12 Figure 9 400 None 10
Table 5. 3.3V Output
DERATING CURVE V
IN
(V) POWER LOSS CURVE AIR FLOW (LFM) HEAT SINK
θ
JA
(°C/W)
Figures 13, 14 5, 12 Figure 10 0 None 14
Figures 13, 14 5, 12 Figure 10 200 None 12
Figures 13, 14 5, 12 Figure 10 400 None 10