LTM4638

3

Rev. C

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ELECTRICAL CHARACTERISTICS The

l

denotes the specifications which apply over the specified internal

operating temperature range (Note 2), otherwise specifications are at TA = 25°C. VIN = 12V per the typical application shown on the

front page.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Switching Regulator Section: per Channel

VIN

Input DC Voltage

l

3.1

20

V

VOUT

Output Voltage Range

l

0.6

5.5

V

VOUT(DC)

Output Voltage, Total

Variation with Line and Load

(Note 6)

CIN = 22µF, COUT = 100µF Ceramic, RFB = 40.2k,

MODE = INTVCC, IOUT = 0A to 15A (Note 3)

–40°C to 125°C

l

1.477

1.50

1.523

V

VRUN

RUN Pin On Threshold

VRUN Rising

1.1

1.25

1.35

V

IQ(VIN)

Input Supply Bias Current

VIN = 12V, VOUT = 1.5V, MODE = INTVCC

VIN = 12V, VOUT = 1.5V, MODE = GND

Shutdown, RUN = 0, VIN = 12V

100

18

20

mA

mA

µA

IS(VIN)

Input Supply Current

VIN = 12V, VOUT = 1.5V, IOUT = 15A

2.3

A

IOUT(DC)

Output Continuous Current

Range

VIN = 12V, VOUT = 1.5V

0

15

A

ΔVOUT (Line)/VOUT Line Regulation Accuracy

VOUT = 1.5V, VIN = 3.1V to 20V, IOUT = 0A

l

0.04

0.15

%/V

ΔVOUT (Load)/VOUT Load Regulation Accuracy

VOUT = 1.5V, IOUT = 0A to 15A

l

0.5

1.2

%

VOUT(AC)

Output Ripple Voltage

IOUT = 0A, COUT = 100µF Ceramic, VIN = 12V,

VOUT = 1.5V

5

mV

ΔVOUT(START)

Turn-On Overshoot

IOUT = 0A, COUT = 100µF Ceramic, VIN = 12V,

VOUT = 1.5V

30

mV

tSTART

Turn-On Time

COUT = 100µF Ceramic, No Load, TRACK/SS = 0.01µF,

VIN = 12V, VOUT = 1.5V

2.5

ms

ΔVOUTLS

Peak Deviation for Dynamic

Load

Load: 0% to 50% to 0% of Full Load, COUT = 47µF

Ceramic, VIN = 12V, VOUT = 1.5V

160

mV

tSETTLE

Settling Time for Dynamic

Load Step

Load: 0% to 50% to 0% of Full Load, COUT = 47µF

Ceramic, VIN = 12V, VOUT = 1.5V

40

µs

IOUTPK

Output Current Limit

VIN = 12V, VOUT = 1.5V

18

A

VFB

Voltage at FB Pin

IOUT = 0A, VOUT = 1.5V

l

0.594

0.60

0.606

V

IFB

Current at FB Pin

(Note 4)

±30

nA

RFBHI

Resistor Between VOUT and

FB Pins

60.05

60.40

60.75

kΩ

ITRACK/SS

Track Pin Soft-Start Pull-Up

Current

TRACK/SS = 0V

6

10

µA

VIN(UVLO)

VIN Undervoltage Lockout

VIN Falling

VIN Hysteresis

2.5

2.6

250

2.7

V

mV

tON(MIN)

Minimum On-Time

(Note 4)

25

ns

tOFF(MIN)

Minimum Off-Time

(Note 4)

50

ns

VPGOOD

PGOOD Trip Level

VFB With Respect to Set Output

VFB Ramping Negative

VFB Ramping Positive

–12

5

–8

8

–5

12

%

%

IPGOOD

PGOOD Leakage

2

µA

VPGL

PGOOD Voltage Low

IPGOOD = 1mA

0.02

0.1

V