LTM4608AEV-PBF Просмотр технического описания (PDF) - Linear Technology

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LTM4608AEV-PBF

Low VIN, 8A DC/DC µModule Regulator with Tracking, Margining, and Frequency Synchronization

Linear Technology 

LTM4608A

TYPICAL PERFORMANCE CHARACTERISTICS

Load Transient Response

Load Transient Response

Load Transient Response

ILOAD

2A/DIV

VOUT

20mV/DIV

AC COUPLED

ILOAD

2A/DIV

VOUT

20mV/DIV

AC COUPLED

ILOAD

2A/DIV

VOUT

20mV/DIV

AC COUPLED

VIN = 5V

20µs/DIV

VOUT = 1.8V, RFB = 4.87k

2.5A/µs STEP

4608A G10

COUT = 100µF X5R

C1 = NONE, C3 = NONE FROM FIGURE 18

VIN = 5V

20µs/DIV

VOUT = 1.5V, RFB = 6.65k

2.5A/µs STEP

4608A G11

COUT = 100µF X5R

C1 = NONE, C3 = NONE FROM FIGURE 18

VIN = 5V

20µs/DIV

VOUT = 1.2V, RFB = 10k

2.5A/µs STEP

4608A G12

COUT = 2 × 100µF

C1 = 100pF, C3 = NONE FROM FIGURE 18

Start-Up

VOUT

0.5V/DIV

VIN

2V/DIV

VIN = 5V

50µs/DIV

VOUT = 1.5V

COUT = 100µF NO LOAD AND 8A LOAD

(DEFAULT 100µs SOFT-START)

4608A G13

2.5V Output Current

3.0

2.5

2.0

1.5

1.0

0.5

0

0

5

10

15

20

OUTPUT CURRENT (A)

4608A G16

VFB vs Temperature

602

600

VIN = 5.5V

598

VIN = 3.3V

596

VIN = 2.7V

594

592

590

–55 –25 5

35 65 95 125

TEMPERATURE (°C)

4608A G14

Short-Circuit Protection

(2.5V Short, No Load)

2V/DIV

2V/DIV

VIN

VOUT

5A/DIV

IOUT

VIN = 5V

VOUT = 2.5V

50µs/DIV

4608A G17

Load Regulation vs Current

0

–0.1

–0.2

–0.3

–0.4

–0.5

FC MODE

VIN = 3.3V

VOUT = 1.5V

–0.6

0

2

4

6

LOAD CURRENT (A)

Short-Circuit Protection

(2.5V Short, 4A Load)

8

4608A G15

5V/DIV

5V/DIV

VIN

VOUT

5A/DIV

IOUT LOAD

VIN = 5V

VOUT = 2.5V

50µs/DIV

4608A G18

4608afc

6

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