LTM8049 datasheet(4/32 Pages) LINER

4 / 32 page

LTM4653

Rev 0

For more information www.analog.com

The l denotes the specifications which apply over the specified internal

operating temperature range (Note 2). TA = 25°C, Test Circuit, VIN = SVIN = 48V, EXTVCC = 24V, RUN = 3.3V, RISET = 480k,

RfSET = 57.6kΩ, fSW = 1.5MHz (CLKIN driven with 1.2MHz clock signal) unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX UNITS

VRUN

RUN Turn-On/-Off Thresholds

RUN Input Turn-On Threshold, RUN Rising

RUN Hysteresis

1.08

1.2

130

1.32

IRUN

RUN Leakage Current

RUN = 3.3V

0.1

Oscillator and Phase-Locked Loop (PLL)

fOSC

Oscillator Frequency Accuracy

VIN = 12V, ISETa = 5V, and:

fSET Open Circuit

RfSET = 57.6kΩ (See fs Specification)

360

400

1.95

440

kHz

MHz

fSYNC

PLL Synchronization Capture Range

VIN = 12V, ISETa = 5V, CLKIN Driven with a GND-

Referred Clock Toggling from 0.4V to 1.2V and Having

a Clock Duty Cycle:

From 10% to 90%; fSET Open Circuit

From 40% to 60%; RfSET = 57.6kΩ

250

1.3

550

kHz

MHz

VCLKIN

CLKIN Input Threshold

VCLKIN Rising

VCLKIN Falling

1.2

0.4

ICLKIN

CLKIN Input Current

VCLKIN = 5V

VCLKIN = 0V

–20

230

–5

500

μA

Power Good Feedback Input and Power Good Output

OVPGDFB

Output Overvoltage PGOOD Upper

Threshold

PGDFB Rising

620

645

675

UVPGDFB

Output Undervoltage PGOOD Lower

Threshold

PGDFB Falling

525

555

580

∆VPGDFB

PGOOD Hysteresis

PGDFB Returning

RPGDFB

Resistor Between PGDFB and SGND

4.94

4.99

5.04

kΩ

RPGOOD

PGOOD Pull-Down Resistance

VPGOOD = 0.1V, VPGDFB < UVPGDFB or

VPGDFB > OVPGDFB

700

1500

IPGOOD(LEAK)

PGOOD Leakage Current

VPGOOD = 3.3V, UVPGDFB < VPGDFB < OVPGDFB

0.1

μA

tPGOOD(DELAY)

PGOOD Delay

PGOOD Low to High (Note 4)

PGOOD High to Low (Note 4)

16/fSW(HZ)

64/fSW(HZ)

Current Monitor and Input Voltage Regulation Pins

hIMONa

IOUT/IIMONa

Ratio of VOUT Output Current to IIMONa Current, IOUT = 4A l

IOS(IMON)

IMONa Offset Current

IIMONa at IOUT = 0A

–5

µA

IMONb Resistor

Resistor Between IMONb and SGND

9.8

10.2

kΩ

VIMONa

IMONa Servo Voltage

IMONa Voltage During Output Current Regulation

1.9

2.0

2.1

VVINREG

VINREG Servo Voltage

VINREG Voltage During Output Current Regulation

1.8

2.0

2.2

IVINREG

VINREG Leakage Current

VINREG = 2V

INTVCC Regulator

VINTVCC

Channel Internal VCC Voltage, No

INTVCC Loading (IINTVCC = 0mA)

3.6V ≤ SVIN ≤ 58V, EXTVCC = Open Circuit

5V ≤ SVIN ≤ 58V, 3.2V ≤ EXTVCC ≤ 26.5V

3.15

2.85

3.4

3.0

3.65

3.15

VEXTVCC(TH)

EXTVCC Switchover Voltage

(Note 4)

3.15

∆VINTVCC(LOAD)/

VINTVCC

INTVCC Load Regulation

0mA ≤ IINTVCC ≤ 30mA

–2

0.5

ELECTRICAL CHARACTERISTICS

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