LTM4644 datasheet(27/38 Pages) LINER

27 / 38 page

LTM4650A

4650afb

For more information www.linear.com/LTM4650A

APPLICATIONS INFORMATION

Table 6. Output Voltage Response vs Component Matrix (Refer to Figure 33) Load Step Typical Measured Values

2-Phase Single Output Solution

CIN (CERAMIC)

COUT (CERAMIC)

COUT (BULK)

VENDORS VALUE

PART NUMBER

VENDORS

VALUE

PART NUMBER

VENDORS VALUE

PART NUMBER

MURATA

22μF, 16V,

X5R, 1210

GRM32ER61C226KE20L MURATA

100μF, 6.3V,

X5R, 1210

GRM32ER60J107ME20L Panasonic 470µF, 6.3V

10mΩ

6TPF470MAH1

MURATA

22μF, 16V,

X5R, 1206

GRM31CR61C226KE15K MURATA

220μF, 4V,

X5R, 1206

GRM31CR60G227M

Panasonic 470µF, 2.5V

3mΩ

EEFGX0E4TIR2

TDK

22μF, 16V,

X5R, 1210

C3225X5R1C226M250AA Taiyo Yuden 100μF, 6.3V,

X5R, 1210

JMK325BJ107MM-T

Taiyo Yuden 220µF, 4V,

X5R, 1210

AMK325ABJ227MM-T

25% Load Step (0A to 12.5A), Ceramic Output Cap Only Solutions

VIN

VOUT

CIN3

(BULK)

CIN

(CERAMIC)

COUT

(BULK)

COUT

(CERAMIC)

FEED-FORWARD

CAPACITOR (CFF)

PEAK-PEAK

DEVIATION

(VPK-PK)

SETTLING

TIME

(tSETTLE)

LOAD

STEP

LOAD STEP

SLEW RATE

RFB

(kΩ)

FREQ

(kHz)

12V

150µF

22µF ×4

None

100µF×16

47pF

102mV

50µs

12.5A

10A/µs

90.9

300kHz

12V

1.2V

150µF

22µF ×4

None

100µF×16

47pF

92mV

50µs

12.5A

10A/µs

60.4

400kHz

12V

1.5V

150µF

22µF ×4

None

100µF×16

47pF

105mV

50µs

12.5A

10A/µs

40.2

400kHz

12V

1.8V

150µF

22µF ×4

None

100µF×16

47pF

109mV

50µs

12.5A

10A/µs

30.2

500kHz

12V

2.5V

150µF

22µF ×4

None

100µF×16

47pF

134mV

60µs

12.5A

10A/µs

19.1

500kHz

12V

3.3V

150µF

22µF ×4

None

100µF×16

47pF

161mV

60µs

12.5A

10A/µs

13.3

600kHz

12V

Suggest to Use POSCAP + Ceramic Cap

25% Load Step (0A to 12.5A), POSCAP+Ceramic Output Cap Solutions

VIN

VOUT

CIN3

(BULK)

CIN

(CERAMIC)

COUT

(BULK)

COUT

(CERAMIC)

FEED-FORWARD

CAPACITOR (CFF)

PEAK-PEAK

DEVIATION

(VPK-PK)

SETTLING

TIME

(tSETTLE)

LOAD

STEP

LOAD STEP

SLEW RATE

RFB

(kΩ)

FREQ

(kHz)

12V

150µF

22µF ×4

470µF×42

100µF×8

None

82mV

50µs

12.5A

10A/µs

90.9

300kHz

12V

1.2V

150µF

22µF ×4

470µF×42

100µF×8

None

80mV

50µs

12.5A

10A/µs

60.4

400kHz

12V

1.5V

150µF

22µF ×4

470µF×42

100µF×8

None

92mV

60µs

12.5A

10A/µs

40.2

400kHz

12V

1.8V

150µF

22µF ×4

470µF×42

100µF×8

None

97mV

70µs

12.5A

10A/µs

30.2

500kHz

12V

2.5V

150µF

22µF ×4

470µF×42

100µF×8

None

117mV

70µs

12.5A

10A/µs

19.1

500kHz

12V

3.3V

150µF

22µF ×4

470µF×41

100µF×8

None

127mV

80µs

12.5A

10A/µs

13.3

600kHz

12V

150µF

22µF ×4

470µF×41

100µF×8

None

167mV

100µs

12.5A

10A/µs

8.25

700kHz

Notes 1 and 2. Different (BULK) COUT are used. See part number in Table 6.

Note 3. CIN (BULK) may be required with long PCB traces.

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