LTC7813 datasheet(4/32 Pages) LINER

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LTC7800

7800f

For more information www.linear.com/LTC7800

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the specified

operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2), VIN = 12V, VRUN = 5V, EXTVCC = 0V unless

otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

tON(MIN)

Minimum TG On-Time

(Note 7)

INTVCC Linear Regulator

VINTVCCVIN

Internal VCC Voltage

6V < VIN < 60V, VEXTVCC = 0V

4.85

5.1

5.35

VLDOVIN

INTVCC Load Regulation

ICC = 0mA to 50mA, VEXTVCC = 0V

0.7

1.1

VINTVCCEXT

Internal VCC Voltage

6V < VEXTVCC < 13V

4.85

5.1

5.35

VLDOEXT

INTVCC Load Regulation

ICC = 0mA to 50mA,

VEXTVCC = 8.5V

0.6

1.1

VEXTVCC

EXTVCC Switchover Voltage

ICC = 0mA to 50mA,

EXTVCC Ramping Positive

4.5

4.7

4.9

VLDOHYS

EXTVCC Hysteresis

250

Oscillator and Phase-Locked Loop

f25kΩ

Programmable Frequency

RFREQ = 25k;

PLLIN/MODE = DC Voltage

0.27

0.32

0.36

MHz

f65kΩ

Programmable Frequency

RFREQ = 65k;

PLLIN/MODE = DC Voltage

1.18

MHz

f100kΩ

Programmable Frequency

RFREQ =100k;

PLLIN/MODE = DC Voltage

1.75

2.1

2.4

MHz

fLOW

Low Fixed Frequency

VFREQ = 0V;

PLLIN/MODE = DC Voltage

0.79

0.94

1.08

MHz

fHIGH

High Fixed Frequency

VFREQ = INTVCC;

PLLIN/MODE = DC Voltage

1.2

1.44

1.7

MHz

fSYNC

Synchronizable Frequency

PLLIN/MODE = External Clock

0.32

2.25

MHz

PLLIN VIH

PLLIN/MODE Input High Level

PLLIN/MODE = External Clock

2.5

PLLIN VIL

PLLIN/MODE Input Low Level

PLLIN/MODE = External Clock

0.5

PGOOD1 Output

VPGL

PGOOD Voltage Low

IPGOOD = 2mA

0.2

0.4

IPGOOD

PGOOD Leakage Current

VPGOOD = 5V

±1

µA

VPG

PGOOD Trip Level

VFB with Respect to Set Regulated Voltage

VFB Ramping Negative

–13

–10

–7

Hysteresis

2.5

VFB Ramping Positive

Hysteresis

2.5

tPG

Delay for Reporting a Fault

µs

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LTC7800 is tested under pulsed load conditions such that

TJ ≈ TA. The LTC7800E is guaranteed to meet performance specifications

from 0°C to 85°C. Specifications over the –40°C to 125°C operating

junction temperature range are assured by design, characterization and

correlation with statistical process controls. The LTC7800I is guaranteed

over the –40°C to 125°C operating junction temperature range, the

LTC7800H is guaranteed over the –40°C to 150°C operating junction

temperature range. High junction temperatures degrade operating

lifetimes; operating lifetime is derated for junction temperatures greater

than 125°C. Note that the maximum ambient temperature consistent with

these specifications is determined by specific operating conditions in

conjunction with board layout, the rated package thermal impedance and

other environmental factors.

Note 3: The junction temperature (TJ, in °C) is calculated from the ambient

temperature (TA, in °C) and power dissipation (PD, in Watts) according to

the formula:

TJ = TA + (PD • θJA), where θJA is 52°C/W.

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