LTC4232 datasheet(3/20 Pages) LINER

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LTC4234

4234fa

For more information www.linear.com/LTC4234

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the full operating

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

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

DC Characteristics

VDD

Input Supply Range

2.9

IDD

Input Supply Current

MOSFET On, No Load

1.6

VDD(UVL)

Input Supply Undervoltage Lockout

VDD Rising

2.63

2.73

2.85

IOUT

OUT Leakage Current

VOUT = VGATE = 0V, VDD = 15V

VOUT = VGATE = 12V

±700

µA

dVGATE/dt

OUT Turn-On Ramp Rate

GATE Open

0.15

0.35

0.6

V/ms

RON

MOSFET + Sense Resistor On-Resistance

C-Grade, I-Grade

H-Grade

2.3

4.0

7.2

8.2

mΩ

ILIM(TH)

Current Limit Threshold

VFB = 1.35V, ISET Open

VFB = 0V, ISET Open

VFB = 1.35V, RSET = 20k

9.4

22.5

5.7

11.1

7.4

12.8

SOA

MOSFET Safe Operating Area

13.5V, 6A Folded Back, 200W2s (Note 6)

7.5V, 22A Onset of Foldback, 200W2s (Note 7)

Inputs

IIN

OV, UV, FB Input Current

V = 1.2V

±1

µA

ISENSE−(IN)

SENSE− Input Current

VSENSE− = 12V

±10

µA

VTH

OV, UV, FB Threshold Voltage

VPIN Rising

1.205

1.235

1.265

∆VOV(HYST)

OV Hysteresis

∆VUV(HYST)

UV Hysteresis

110

VUV(RTH)

UV Reset Threshold Voltage

VUV Falling

0.55

0.62

0.7

∆VFB(HYST)

FB Power Good Hysteresis

RISET

ISET Internal Resistor

kΩ

Outputs

VINTVCC

INTVCC Output Voltage

VDD = 5V,15V, ILOAD = 0mA, –10mA

2.8

3.1

3.3

VOL

PG, FLT Output Low Voltage

I = 2mA

0.4

0.8

IOH

PG , FLT Input Leakage Current

V = 30V

±10

µA

VTIMER(H)

TIMER High Threshold

VTIMER Rising

1.2

1.235

1.28

VTIMER(L)

TIMER Low Threshold

VTIMER Falling

0.1

0.21

0.3

ITIMER(UP)

TIMER Pull-Up Current

VTIMER = 0V

–80

–100

–120

µA

ITIMER(DN)

TIMER Pull-Down Current

VTIMER = 1.2V

1.4

2.6

µA

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

1.6

2.7

AIMON

IMON Current Gain

4.5

5.25

µA/A

BWIMON

IMON Bandwidth

250

kHz

IOFF(IMON)

IMON Offset Current

IOUT = 600mA

±9

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

500

µA

IGATE(FST)

Gate Fast Pull-Down Current

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

140

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