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LT3694EFE

36V, 2.6A Monolithic Buck Regulator With Dual LDO

Linear Technology 

LT3694/LT3694-1

ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C, VIN = 12V, VBIAS = 3V, unless otherwise noted. (Notes 2, 9)

PARAMETER

LDO Regulator

Feedback Pin Voltage

Feedback Pin Bias Current

Error Amplifier Voltage Gain

TRK/SS Pull-Up Current

TRK/SS Threshold to Shut Down LDO

Line Regulation

Load Regulation

Base Drive

Current Limit Threshold

Short-Circuit Current Limit Threshold

Minimum BIAS to DRV Voltage (Note 7)

Minimum VIN to DRV Voltage

CONDITIONS

5V < VIN < 36V

IDRV From 0.1mA to 10mA

VFB = 0

IDRV = 10mA

IDRV = 10mA

MIN TYP MAX UNITS

l 735

l

–2

35

l 10

l 47

22

l

l

750

–50

2800

–3

50

0.025

0.5

15

60

26

0.3

2.0

765

mV

–500

nA

–4

µA

70

mV

%/V

mV/mA

20

mA

70

mV

30

mV

0.9

V

2.3

V

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 LT3694E is guaranteed to meet performance specifications

from 0°C to 125°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

LT3694I is guaranteed to meet performance specifications from –40°C to

125°C junction temperature.

Note 3: Current limit is guaranteed by design and/or correlation to static

test. Slope compensation reduces current limit at higher duty cycles.

Note 4: This is the minimum voltage across the boost capacitor needed to

guarantee full saturation of the internal power switch.

Note 5: This IC includes overtemperature protection that is intended

to protect the device during momentary overload conditions.

Junction temperature will exceed the maximum operating range when

overtemperature protection is active. Continuous operation above the

specified maximum operating junction temperature may impair

device reliability.

Note 6: Absolute Maximum Voltage at VIN and EN/UVLO pins is 70V for

non-repetitive, 1 second transients and 36V for continuous operation.

Note 7: The LDO will function if the BIAS to DRV differential is not met,

but the base drive current will be drawn from VIN instead of BIAS.

Note 8: The PGOOD pin will pull low when the voltage on any of the three

FB pins is lower than the PGOOD threshold value.

Note 9: Positive currents flow into pins, negative currents flow out of pins.

Minimum and maximum values refer to absolute values.

36941fb

4

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