LTM4650-1 datasheet(3/34 Pages) LINER

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LTM4645

4645f

For more information www.linear.com/LTM4645

elecTrical characTerisTics The

denotes the specifications which apply over the specified internal

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

VIN

Input DC Voltage

4.7

VOUT(RANGE)

Output Voltage Range

VIN = 4.7V to 15V

0.6

1.8

VOUT(DC)

Output Voltage, Total Variation

with Line and Load

CIN = 22µF × 4, COUT = 100µF Ceramic, 470µF POSCAP,

RFB = 60.4k, MODE = GND,VIN = 4.7V to 15V, IOUT = 0A to 25A l 1.186 1.200 1.214

Input Specifications

IQ(VIN)

Input Supply Bias Current

VIN = 12V, VOUT = 1.2V, Burst Mode Operation, IOUT = 0A

VIN = 12V, VOUT = 1.2V, Pulse-Skipping Mode, IOUT = 0A

VIN = 12V, VOUT = 1.2V, Switching Continuous, IOUT = 0A

Shutdown, RUN = 0, VIN = 12V

170

µA

IS(VIN)

Input Supply Current

VIN = 12V, VOUT = 1.2V, IOUT = 25A

3.0

Output Specifications

IOUT(DC)

Output Continuous Current

Range

VIN = 12V, VOUT = 1.2V (Note 4)

∆VOUT(LINE)/VOUT Line Regulation Accuracy

VOUT = 1.2V, VIN from 4.7V to 15V, IOUT = 0A

0.005

0.05

%/V

∆VOUT(LOAD)/ VOUT Load Regulation Accuracy

VOUT = 1.2V, IOUT = 0A to 25A, VIN = 12V (Note 4)

0.1

0.3

VOUT(AC)

Output Ripple Voltage

COUT = 100µF Ceramic × 6,

VIN = 12V, VOUT = 1.2V, IOUT = 0A

∆VOUT(START)

Turn-On Overshoot

COUT = 100µF Ceramic × 6,

VIN = 12V, VOUT = 1.2V, IOUT = 0A

tSTART

Turn-On Time

COUT = 100µF Ceramic × 6

VIN = 12V, VOUT = 1.2V, No Load, TRACK/SS = 0.01µF

∆VOUTLS

Peak Deviation for Dynamic

Load

Load: 0% to 50% to 0% of Full Load,

COUT = 100µF Ceramic × 6, VIN = 12V, VOUT = 1.2V

tSETTLE

Settling Time for Dynamic

Load Step

Load: 0% to 50% to 0% of Full Load,

COUT = 100µF Ceramic × 6, VIN = 12V, VOUT = 1.2V

µs

IOUTPK

Output Current Limit

VIN = 12V, VOUT = 1.2V

Control Specifications

VFB

Voltage at VFB Pin

IOUT = 0A, VOUT = 1.2V

594

600

606

IFB

Current at VFB Pin

(Note 7)

–30

–100

ITRACK/SS

Track Pin Soft-Start Pull-Up

Current

TRACK/SS = 0V

1.25

µA

tON(MIN)

Minimum On-Time

(Note 3)

RFBHI

Resistor Between VOUT_LCL

and VFB Pins

60.05

60.40

60.75

kΩ

VRUN

RUN Pin On Threshold

VRUN Rising

1.2

1.35

1.45

VRUNHYS

RUN Pin On Hysteresis

180

UVLO

Undervoltage Lockout

VINTVCC Falling

UVLOHYS

UVLO Hysteresis

400

VHIZB

HIZB Pin On Threshold

VHIZB Rising

2.3

VHIZBHYS

HIZB Pin On Hysteresis

800

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