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3507

Triple Monolithic Step-Down Regulator with LDO

Linear Technology 

LT3507

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

temperature range, otherwise specifications are at TA = 25°C. VIN1, VIN2, VIN3 = 12V, VBOOST1, VBOOST2, VBOOST3 = 17V, unless

otherwise noted (Note 2)

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

Load Regulation

DRIVE Output Current Limit

IDRIVE from 0.1mA to 10mA

l 10

0.005

15

22.5

%/mA

mA

Dropout Voltage, VIN1 to DRIVE

Dropout Voltage, BIAS to DRIVE

Over/Undervoltage Lockout

IDRIVE = 10mA

IDRIVE = 10mA

1.7

2.0

V

0.5

0.8

V

Undervoltage Lockout Threshold

1.15 1.20 1.25

V

Overvoltage Lockout Threhold

1.15 1.20 1.25

V

Undervoltage Lockout Hysteresis Current

V(UVLO) < 1.2V

7

10

13

μA

Overvoltage Lockout Hysteresis Current

V(OVLO) > 1.2V

–7

–10

–13

μA

Input Bias Current (OVLO and UVLO)

–100 –200

nA

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 LT3507E 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

LT3507I is guaranteed to meet performance specifications from –40°C

to 125°C junction temperature. The LT3507H is guaranteed over the full

–40°C to 150°C operating junction temperature range. High junction

temperatures degrade operating lifetimes. Operating lifetime is derated at

junction temperatures greater than 125°C.

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.

3507f

4

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