LTC3374A

4

3374af

For more information www.linear.com/LTC3374A

elecTrical characTerisTics

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 LTC3374A is tested under pulsed load conditions such that

0°C to 85°C 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

LTC3374AI is guaranteed over the –40°C to 125°C operating junction

temperature range and the LTC3374AH 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. The junction

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Temperature Monitor

TEMP Voltage at 25°C

200

220

7

240

mV

mV/°C

OT

Overtemperature Shutdown (Note 3)

Temperature Rising

Hysteresis

170

10

°C

°C

Interface Logic Pins

Output High Leakage Current

5.5V at the PGOOD_ALL Pin

–1

0

1

µA

Output Low Voltage

3mA into the PGOOD_ALL Pin

0.1

0.4

V

Input High Threshold

MODE Pin

l

1.2

V

Input Low Threshold

MODE Pin

l

0.4

V

Input High Leakage Current

–100

0

100

nA

Input Low Leakage Current

–100

0

100

nA

EN Rising Threshold

First Regulator Turning On

One Regulator Already in Use

l

l

400

380

730

400

1200

420

mV

mV

EN Falling Threshold

l

300

320

340

mV

Note 3: The LTC3374A includes overtemperature protection which

protects 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 4: Static current, switches not switching. Actual current may be

higher due to gate charge losses at the switching frequency.

Note 5: The current limit features of this part are intended to protect the

IC from short term or intermittent fault conditions. Continuous operation

above the maximum specified pin current rating may result in device

degradation over time.

Note 6: The Soft-Start Time is the time from the start of switching until the

FB pin reaches 775mV. When a buck is enabled there is a 100μs (typical)

delay before switching commences.