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LTM4649_15 Datasheet, PDF (23/30 Pages) Linear Technology – 10A Step-Down DC/DC Module Regulator
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LTM4649
Applications Information
Table 3. Output Voltage Response vs Component Matrix (Refer to Figure 18) 0A to 5A Load Step Typical Measured Values
CIN
(BULK)*
CIN
VENDORS PART NUMBER (CERAMIC) VENDORS
PART NUMBER
COUT
(CERAMIC) VENDORS
PART NUMBER
150µF, 16V SANYO OSCON 25HVH150MT 22µF, 16V MURATA GRM32ER71C226KE18L 100µF, 6.3V MURATA GRM32ER60J107ME20L
220µF, 4V MURATA GRM31CR60G227M
CIN
CIN
COUT
VOUT VIN (BULK)* (CERAMIC) (CERAMIC) CFF LOAD STEP
1V 5V, 12V 120µF* 22µF × 2 100µF × 3 None 75% to 100%
1.2V 5V, 12V 120µF* 22µF × 2 100µF × 3 None 75% to 100%
1.5V 5V, 12V 120µF* 22µF × 2 100µF × 3 None 75% to 100%
2.5V 5V 120µF* 22µF × 2 100µF × 3 None 75% to 100%
2.5V 12V 120µF* 22µF × 2 100µF × 3 None 75% to 100%
3.3V 5V 120µF* 22µF × 2 100µF × 3 None 75% to 100%
3.3V 12V 120µF* 22µF × 2 100µF × 3 None 75% to 100%
1V 5V, 12V 120µF* 22µF × 2 220µF × 2 None 50% to 100%
1.2V 5V, 12V 120µF* 22µF × 2 220µF × 2 None 50% to 100%
1.5V 5V, 12V 120µF* 22µF × 2 220µF × 2 None 50% to 100%
2.5V 5V 120µF* 22µF × 2 220µF × 2 None 50% to 100%
2.5V 12V 120µF* 22µF × 2 220µF × 2 None 50% to 100%
3.3V 5V 120µF* 22µF × 2 220µF × 2 None 50% to 100%
3.3V 12V 120µF* 22µF × 2 220µF × 2 None 50% to 100%
*Bulk capacitor is optional if VIN has very low input impedance.
VDROOP
45mV
50mV
57mV
75mV
75mV
95mV
95mV
70mV
75mV
90mV
135mV
135mV
175mV
175mV
RECOVERY LOAD STEP
FREQ
VP-P
TIME
SPEED RFB SW FREQ PIN
90mV 40µs
1A/µs 15kΩ 450kHz Float
100mV 50µs
1A/µs 10kΩ 450kHz Float
114mV 60µs
1A/µs 6.65kΩ 450kHz Float
150mV 70µs
1A/µs 3.16kΩ 450kHz Float
150mV 70µs
190mV 70µs
1A/µs
1A/µs
3.16kΩ 750kHz INTVCC
2.21kΩ 450kHz Float
190mV 70µs
140mV 30µs
1A/µs
1A/µs
2.21kΩ 750kHz INTVCC
15kΩ 450kHz Float
150mV 40µs
1A/µs 10kΩ 450kHz Float
180mV 40µs
1A/µs 6.65kΩ 450kHz Float
270mV 50µs
1A/µs 3.16kΩ 450kHz Float
270mV 50µs
350mV 60µs
1A/µs
1A/µs
3.16kΩ 750kHz INTVCC
2.21kΩ 450kHz Float
350mV 60µs
1A/µs 2.21kΩ 750kHz INTVCC
Table 4. 1.5V Output
DERATING CURVE
Figures 11, 12
Figures 11, 12
Figures 11, 12
VIN (V)
5, 12
5, 12
5, 12
POWER LOSS CURVE
Figure 9
Figure 9
Figure 9
AIR FLOW (LFM)
0
200
400
HEAT SINK
None
None
None
θJA(°C/W)
14
12
10
Table 5. 3.3V Output
DERATING CURVE
Figures 13, 14
Figures 13, 14
Figures 13, 14
VIN (V)
5, 12
5, 12
5, 12
POWER LOSS CURVE
Figure 10
Figure 10
Figure 10
AIR FLOW (LFM)
0
200
400
HEAT SINK
None
None
None
θJA(°C/W)
14
12
10
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