LTM8049 datasheet(4/34 Pages) LINER

4 / 34 page

LTM4651

4651f

For more information www.linear.com/LTM4651

The l denotes the specifications which apply over the specified internal

operating temperature range (Note 2). TA = 25°C, Test Circuit 1, VIN = 24V and electrically connected to SVIN and RUN, ISETa – SVOUT– =

24V, EXTVCC = PGND, CLKIN open circuit, RfSET = 57.6kΩ and RISET = 480kΩ and voltages referred to PGND unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX UNITS

IOUT(OCL)–

IOUT– Output Current Limit

2.45

Control Section

IISETa

Reference Current of ISETa Pin

VISETa – SVOUT– = 0.5V, 3.6V ≤ VIN ≤ 28V

0.1V ≤ VISETa – SVOUT– ≤ VIN – SVOUT– ≤ 58V

49.3

50.7

µA

IGNDSNS

GNDSNS Leakage Current

VIN – SVOUT– = SVIN – SVOUT– = RUN – GND =

ISETa – SVOUT– = 58V

600

μA

tON(MIN)

Minimum On-Time

(Note 4 )

VRUN

RUN Turn-On/-Off Thresholds

RUN Input Turn-On Threshold, RUN Rising

RUN Hysteresis

(RUN Thresholds Measured with Respect to GND)

1.08

1.2

130

1.32

IRUN

RUN Leakage Current

VIN – 48V, RUN – GND = 3.3V

0.1

Oscillator and Phase-Locked Loop (PLL)

fOSC

Oscillator Frequency Accuracy

VIN = 12V, ISETa – SVOUT– = 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 – SVOUT– = 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, with Respect to GND

VCLKIN Falling, with Respect to GND

1.2

0.4

ICLKIN

CLKIN Input Current

VCLKIN = 5V with Respect to GND

VCLKIN = 0V with Respect to GND

–20

230

–5

500

μA

Power Good Feedback Input and Power Good Output

OVPGDFB

Output Overvoltage PGOOD Upper

Threshold

PGDFB Rising, Differential Voltage from PGDFB

to SVOUT–

620

645

675

UVPGDFB

Output Undervoltage PGOOD Lower

Threshold

PGDFB Falling, Differential Voltage from

PGDFB to SVOUT–

525

555

580

∆VPGDFB

PGOOD Hysteresis

PGDFB Returning

RPGDFB

Resistor Between PGDFB and SVOUT–

4.94

4.99

5.04

kΩ

RPGOOD

PGOOD Pull-Down Resistance

VPGOOD = 0.1V with Respect to GND, VPGDFB–SVOUT– <

UVPGDFB or VPGDFB – SVOUT– > OVPGDFB

700

1500

IPGOOD(LEAK)

PGOOD Leakage Current

VPGOOD = 3.3V with Respect to GND, UVPGDFB <

VPGDFB – SVOUT– < 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)

ELECTRICAL CHARACTERISTICS

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