LTC4232 datasheet(3/16 Pages) LINER

3 / 16 page

LTC4232

4232fb

For more information www.linear.com/LTC4232

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Inputs

IIN

OV, UV, FB Pin Input Current

V = 1.2V

±1

µA

VTH

OV, UV, FB Pin Threshold Voltage

VPIN Rising

1.21

1.235

1.26

∆VOV(HYST)

OV Pin Hysteresis

∆VUV(HYST)

UV Pin Hysteresis

110

VUV(RTH)

UV Pin Reset Threshold Voltage

VUV Falling

0.55

0.62

0.7

∆VFB(HYST)

FB Pin Power Good Hysteresis

RISET

ISET Pin Internal Resistor

kΩ

Outputs

VINTVCC

INTVCC Output Voltage

VDD = 5V, 15V, ILOAD = 0mA, –10mA

2.8

3.1

3.3

VOL

PG, FLT Pin Output Low Voltage

I = 2mA

0.4

0.8

IOH

PG, FLT Pin Input Leakage Current

V = 30V

±10

µA

VTIMER(H)

TIMER Pin High Threshold

VTIMER Rising

1.2

1.235

1.28

VTIMER(L)

TIMER Pin Low Threshold

VTIMER Falling

0.1

0.21

0.3

ITIMER(UP)

TIMER Pin Pull-Up Current

VTIMER = 0V

–80

–100

–120

µA

ITIMER(DN)

TIMER Pin Pull-Down Current

VTIMER = 1.2V

1.4

2.6

µA

ITIMER(RATIO) TIMER Pin Current Ratio ITIMER(DN)/ITIMER(UP)

1.6

2.7

AIMON

IMON Pin Current Gain

IOUT = 2.5A

18.5

21.5

µA/A

IOFF(IMON)

IMON Pin Offset Current

IOUT = 150mA

±4.5

µA

IGATE(UP)

Gate Pull-Up Current

Gate Drive On, VGATE = VOUT = 12V

–18

–24

–29

µA

IGATE(DN)

Gate Pull-Down Current

Gate Drive Off, VGATE = 18V, VOUT = 12V

180

250

400

µA

IGATE(FST)

Gate Fast Pull-Down Current

Fast Turn Off, VGATE = 18V, VOUT = 12V

140

AC Characteristics

tPHL(GATE)

Input High (OV), Input Low (UV) to Gate Low

Propagation Delay

VGATE < 16.5V Falling

µs

tPHL(ILIM)

Short-Circuit to Gate Low

VFB = 0, Step ISENSE to 6A,

VGATE < 15V Falling

µs

tD(ON)

Turn-On Delay

Step VUV to 2V, VGATE > 13V

100

150

tD(CB)

Circuit Breaker Filter Delay Time (Internal)

VFB = 0V, Step ISENSE to 3A

1.3

2.7

tD(AUTO-RETRY) Auto-Retry Turn-On Delay (Internal)

100

150

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: All currents into pins are positive, all voltages are referenced to

GND unless otherwise specified.

Note 3: An internal clamp limits the GATE pin to a maximum of 6.5V

above OUT. Driving this pin to voltages beyond the clamp may damage the

device.

Note 4: This IC includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed 125°C when overtemperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

Note 5: TJ is calculated from the ambient temperature, TA, and power

dissipation, PD, according to the formula:

TJ = TA + (PD • 46°C/W)

ELECTRICAL CHARACTERISTICS The

denotes those specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VDD = 12V unless otherwise noted.

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