LTM4644MPY datasheet(3/36 Pages) LINER

3 / 36 page

LTM4644/LTM4644-1

4644fe

For more information www.linear.com/LTM4644

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the full operating

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

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Switching Regulator Section: per Channel

VIN, SVIN

Input DC Voltage

SVIN = VIN

VOUT(RANGE)

Output Voltage Range

0.6

5.5

VOUT(DC)

Output Voltage, Total Variation

with Line and Load

CIN = 22µF, COUT = 100µF Ceramic,

MODE = INTVCC,VIN = 4V to 14V, IOUT = 0A to 4A (Note 4)

LTM4644: RFB(BOT) = 40.2k

LTM4644-1: RFB(TOP) = 60.4k, RFB(BOT) = 40.2k

1.477

1.50

1.523

VRUN

RUN Pin On Threshold

VRUN Rising

1.1

1.2

1.3

IQ(SVIN)

Input Supply Bias Current

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

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

Shutdown, RUN = 0, VIN = 12V

µA

IS(VIN)

Input Supply Current

VIN = 12V, VOUT = 1.5V, IOUT = 4A

0.62

IOUT(DC)

Output Continuous Current Range VIN = 12V, VOUT = 1.5V (Note 4)

ΔVOUT (Line)/VOUT Line Regulation Accuracy

VOUT = 1.5V, VIN = 4V to 14V, IOUT = 0A

0.04

0.15

%/V

ΔVOUT (Load)/VOUT Load Regulation Accuracy

VOUT = 1.5V, IOUT = 0A to 4A

0.5

VOUT(AC)

Output Ripple Voltage

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

VOUT = 1.5V

ΔVOUT(START)

Turn-On Overshoot

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

VOUT = 1.5V

tSTART

Turn-On Time

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

VIN = 12V, VOUT = 1.5V

2.5

ΔVOUTLS

Peak Deviation for Dynamic Load Load: 0% to 50% to 0% of Full Load, COUT = 47µF

Ceramic, VIN = 12V, VOUT = 1.5V

160

tSETTLE

Settling Time for Dynamic Load

Step

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

Ceramic, VIN = 12V, VOUT = 1.5V

µs

IOUTPK

Output Current Limit

VIN = 12V, VOUT = 1.5V

VFB

Voltage at FB Pin

IOUT = 0A, VOUT = 1.5V, 0°C to 125°C

IOUT = 0A, VOUT = 1.5V, –40°C to 125°C

0.594

0.592

0.60

0.606

0.608

IFB

Current at FB Pin

(Note 3)

±30

RFBHI

Resistor Between VOUT and FB

Pins

LTM4644 Only

60.05 60.40 60.75

kΩ

ITRACK/SS

Track Pin Soft-Start Pull-Up

Current

TRACK/SS = 0V

2.5

µA

VIN(UVLO)

VIN Undervoltage Lockout

VIN Falling

VIN Hysteresis

2.4

2.6

350

2.8

tON(MIN)

Minimum On-Time

(Note 3)

tOFF(MIN)

Minimum Off-Time

(Note 3)

VPGOOD

PGOOD Trip Level

VFB With Respect to Set Output

VFB Ramping Negative

VFB Ramping Positive

–13

–10

–7

IPGOOD

PGOOD Leakage

µA

VPGL

PGOOD Voltage Low

IPGOOD = 1mA

0.02

0.1

VINTVCC

Internal VCC Voltage

SVIN = 4V to 14V

3.2

3.3

3.4

VINTVCC Load Reg INTVCC Load Regulation

ICC = 0mA to 20mA

0.5

fOSC

Oscillator Frequency

MHz

CLKIN

CLKIN Threshold

0.7

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