LTC7825

3

Rev. A

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ELECTRICAL CHARACTERISTICS The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC = 12V, VRUN = 5V, unless otherwise specified. (Note 2)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

INPUT/OUTPUT VOLTAGE

VCC

IC Bias Voltage Range

4.5

40

V

VVHIGH

VHIGH Voltage Range

0

25

V

VVLOW

VLOW Voltage Range

0

12.5

V

IQ

VCC Supply Current

Normal Operation

VRUN = 0V

VRUN = 5V, No Switching

20

3

μA

mA

VUVLO

Undervoltage Lockout Threshold

VINTVCC Falling

VINTVCC Rising

3.9

4.2

V

V

Gate Drivers

RDS(ON)1,2

Top Two MOSFETs On-Resistance

8

mΩ

RDS(ON)3,4

Bottom Two MOSFETs On-Resistance

6

mΩ

RDS(ON)5

VOUT MOSFETs On-Resistance

2.5

mΩ

RUN Pin

VRUN

RUN Pin on Threshold

VRUN Rising

1.1

1.22

1.35

V

VRUN,HYS

RUN Pin on Hysteresis

80

mV

INTVCC Regulator

VINTVCC_VCC

VCC LDO Voltage No Load

VCC = 12V, VEXTVCC = 0V

4.25

4.5

4.75

V

VINTVCC_EXT

EXTVCC LDO Voltage No Load

VEXTVCC = 8V, VCC = 12V (Note 5)

4.25

4.5

4.75

V

VEXTVCC

EXTVCC Switchover Voltage

VEXTVCC Ramping Positive (Note 6)

5.1

V

VLDOHYS

EXTVCC Hysteresis

300

mV

VHIGH and VLOW Resistance

RVHIGH

VHIGH to GND Resistance

1.2

MegΩ

RVLOW

VLOW to GND Resistance

0.6

MegΩ

VLOW Balance Current

ISOURCE

Source Current to VLOW Pin

VHIGH = 12V, VLOW = 5V, TIMER = 0.8V

200

mA

ISINK (LTC7825)

Sink Current from VLOW Pin

VHIGH = 12V, VLOW = 7V, TIMER = 0.8V

50

mA

Oscillator

fS

Oscillator Frequency Range

100

1200

kHz

fNOM

Nominal Frequency

VFREQ = 0V

VFREQ = 1.02V

VFREQ = INTVCC

300

400

600

kHz

kHz

kHz

IFREQ

FREQ Setting Current

9

10

11

μA

FAULT and HYS_PRGM

RFAULT

FAULT Open-Drain Pull-Down

Resistance

180

Ω

IFAULT_LEAK

FAULT Leakage Current

VFAULT = 29V

±1

µA