LTC3255 datasheet(3/16 Pages) LINER

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LTC3255

3255f

For more information www.linear.com/LTC3255

The l denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V unless otherwise noted. (Notes 2, 3)

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN

Input Voltage Range (Note 7)

VOUT

Output Voltage Range

2.4

12.5

VUVLO_BK

VIN Undervoltage Lockout Threshold

with Shunt Disabled

VIN Rising, SHUNT = GND

Hysteresis, SHUNT = GND

2.4

2.7

VUVLO_SH

VIN Undervoltage Lockout Threshold

with Shunt Enabled

VIN Rising, SHUNT= BIAS

Hysteresis, SHUNT= BIAS

200

5.7

IVIN

VIN Quiescent Current

EN Low

EN High, SHUNT = GND

EN High, SHUNT = BIAS

Shutdown

Enabled, Output in Regulation

µA

IVOUT

Available Output Current

Shunt Disabled

Shunt Enabled

SHUNT = GND

SHUNT = BIAS, IVIN = 4mA, VOUT = 3.3V

7.4

7.8

VFB

Regulated Feedback Voltage

1.176

1.200

1.224

IFB

FB Pin Leakage

VFB = 1.3V

±10

VEN_VIH

EN High Level Input Voltage

1.4

VEN_VIL

EN Low Level Input Voltage

0.4

IEN

EN Pin Input Current

VEN = 12V

VEN = 0V

±1

µA

ILIM

VOUT Current Limit

120

fOSC

Oscillator Frequency

500

kHz

VPGTHRESH

PGOOD Rising Threshold

% of Final Regulation Voltage

VPG(LOW)

PGOOD Output Low Voltage

IPGOOD = 200µA

0.1

0.4

PGOOD High Impedance Leakage

VPGOOD = 12V

µA

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 voltages are referenced to GND unless otherwise specified.

Note 3: The LTC3255E is guaranteed to meet performance specifications

from 0°C to 85°C operating junction temperature. Specifications over

the –40°C to 125°C operating junction temperature range are assured by

design, characterization and correlation with statistical process controls.

The LTC3255I is guaranteed over the –40°C to 125°C operating junction

temperature range. The LTC3255H is guaranteed over the –40°C to 150°C

operating junction temperature range. The LTC3255MP is guaranteed over

the –55°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 resistance and other environmental factors.

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 (in °C/W) is the package thermal impedance.

Note 4: The LTC3255 has an internal diode that conducts whenever VOUT

is pulled below GND. When so pulled, absolute maximum current out of

VOUT is 50mA.

Note 5: The LTC3255 has an internal diode that conducts whenever

PGOOD is pulled below GND. When so pulled, absolute maximum current

out of PGOOD is 100µA.

Note 6: This IC has overtemperature protection that is intended to protect

the device during momentary overload conditions. Junction temperatures

will exceed 150°C when overtemperature protection is active. Continuous

operation above the specified maximum operating junction temperature

may impair device reliability.

Note 7: This IC has input overvoltage protection that shuts down the

device whenever VIN exceeds the specified input voltage range. Shutdown

typically occurs when VIN exceeds 52V. VIN subsequently must fall below

50V (typical) for the IC to re-enable.

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