LTM4618IV#PBF【PDF 3/24 页】IC DC-DC UMODULE BUCK 6A 84-LGA

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LTM4618

ELECTRICAL CHARACTERISTICS The l denotes the speci?cations which apply over the full internal

operating temperature range, otherwise speci?cations are at T A = 25°C (Note 2), V IN = 12V, per typical application in Figure 21.

SYMBOL

I Q(VIN)

PARAMETER

Input Supply Bias Current

CONDITIONS

V IN = 12V, V OUT = 2.5V, I OUT = 0A

MIN

TYP

26

MAX

UNITS

mA

V IN = 26.5V, V OUT = 2.5V, I OUT = 0A

Shutdown, RUN = 0, V IN = 26.5V

20

80

mA

μA

I S(VIN)

Input Supply Current

V IN = 12V, V OUT = 2.5V, I OUT = 6A

V IN = 26.5V, V OUT = 2.5V, I OUT = 6A

1.430

0.675

A

A

INTV CC

Internal V CC Voltage

V IN = 12V, V RUN > 2V, No Load

4.8

5

5.2

V

V EXTVCC

VLDO External

EXTV CC Switchover Voltage

EXTV CC Voltage Drop

EXTV CC Ramping Positive

INTV CC = 20mA, V EXTVCC = 5V

l

4.5

4.7

50

100

V

mV

V EXTVCC Hysteresis

EXTV CC Hysteresis

200

mV

Output Speci?cations

I OUT(DC)

Output Continuous Current Range

V IN = 12V, V OUT = 2.5V (Note 4)

0

6

A

Δ V OUT(LINE)

V OUT

Δ V OUT(LOAD)

Line Regulation Accuracy

Load Regulation Accuracy

V OUT = 2.5V, V IN from 6V to 26.5V

I OUT = 0A

V IN = 12V, V OUT = 2.5V, 0 to 6A (Note 4)

l

l

0.02

0.3

0.04

0.6

%/V

%

V OUT

V OUT(AC)

Output Ripple Voltage

I OUT = 0A, C OUT = 100μF × 3 X5R Ceramic

V IN = 12V, V OUT = 2.5V

V IN = 26.5V, V OUT = 2.5V

10

12

mV

mV

f S

Δ V OUT(START)

Output Ripple Voltage Frequency

Turn-On Overshoot

I OUT = 2A, V IN = 12V, V OUT = 2.5V, V FREQ = INTV CC

C OUT = 100μF × 3 X5R Ceramic

780

kHz

V OUT = 2.5V, I OUT = 0A

V IN = 12V

V IN = 26.5V

20

20

mV

mV

t START

Turn-On Time

C OUT = 100μF × 3 X5R Ceramic,

V OUT = 2.5V, I OUT = 0A, TK/SS Capacitor = 0.01μF

V IN = 12V

V IN = 26.5V

0.75

0.70

ms

ms

Δ V OUTLS

Peak Deviation for Dynamic Load

Load: 0% to 50% of Full Load

C OUT = 100μF × 3 X5R Ceramic, V OUT = 2.5V

V IN = 12V

15

mV

t SETTLE

Settling Time for Dynamic Load Step

Load: 0% to 50% of Full Load

C OUT = 100μF × 3 X5R Ceramic, V OUT = 2.5V

V IN = 12V

10

μs

I OUT(PK)

Output Current Limit

C OUT = 100μF × 3 X5R Ceramic

Control Section

V IN = 6V, V OUT = 2.5V

V IN = 26.5V, V OUT = 2.5V

11

11

A

A

V FB

I FB

V OVL

I TK/SS

Error Ampli?er Feedback Voltage

Error Ampli?er Feedback Current

Feedback Voltage Lockout

Soft-Start Charge Current

I OUT = 0A, V OUT = 2.5V

(Note 3)

Measured at V FB

V TK/SS = 0V

l

0.792

0.788

0.84

0.9

0.8

0.8

–10

0.86

1.3

0.808

0.808

–50

0.88

1.7

V

V

nA

V

μA

DF MAX

t ON(MIN)

Maximum Duty Factor

Minimum On-Time

In Dropout (Note 3)

(Note 3)

97

90

%

ns

f NOM

f LOW

Nominal Frequency

Lowest Frequency

V FREQ = 1.2V

V FREQ = 0V

450

210

500

250

550

290

kHz

kHz

4618fa

3

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