LT3045-1 datasheet(4/36 Pages) LINER

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LT3045-1

30451fa

For more information www.linear.com/LT3045-1

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

EN/UV Pin Current

VEN/UV = 0V, VIN = 20V

VEN/UV = 1.24V, VIN = 20V

VEN/UV = 20V, VIN = 0V

0.03

±1

µA

Quiescent Current in

Shutdown (VEN/UV = 0V)

VIN = 6V

0.3

µA

Internal Current Limit

(Note 12)

VIN = 2V, VOUT = 0V

VIN = 12V, VOUT = 0V

VIN = 20V, VOUT = 0V

570

230

710

700

330

850

430

Programmable

Current Limit

Programming Scale Factor: 2V < VIN < 20V (Note 11)

VIN = 2V, VOUT = 0V, RILIM = 300Ω

VIN = 2V, VOUT = 0V, RILIM = 1.5kΩ

450

150

500

100

550

110

mA • kΩ

PGFB Trip Point

PGFB Trip Point Rising

291

300

309

PGFB Hysteresis

PGFB Trip Point Hysteresis

PGFB Pin Current

VIN = 2V, VPGFB = 300mV

PG Output Low Voltage

IPG = 100µA

100

PG Leakage Current

VPG = 20V

µA

Reverse Input Current

VIN = –20V, VEN/UV = 0V, VOUT = 0V, VSET = 0V

100

µA

Reverse Output Current

VIN = 0, VOUT = 5V, SET = Open

µA

Minimum Load Required

(Note 13)

VOUT < 1V

µA

Thermal Shutdown

TJ Rising

Hysteresis

165

°C

Start-Up Time

VOUT(NOM) = 5V, ILOAD = 500mA, CSET = 0.47µF, VIN = 6V, VPGFB = 6V

VOUT(NOM) = 5V, ILOAD = 500mA, CSET = 4.7µF, VIN = 6V, VPGFB = 6V

VOUT(NOM) = 5V, ILOAD = 500mA, CSET = 4.7µF, VIN = 6V, RPG1 = 50kΩ,

RPG2 = 700kΩ (with Fast Start-Up to 90% of VOUT)

550

Thermal Regulation

10ms Pulse

–0.01

%/W

Input-to-Output

Differential Voltage

Control (VIOC) (Note 15)

VIOC Amplifier Gain

V/V

VIOC Pin Voltage Range: VOUT > VVIOC + 0.5V

VIOC Pin Voltage: VOUT ≤ 1.5V, VIN = 2.5V

VIOC Pin Source Current

200

µA

VIOC Pin Sink Current: VIN ≥ 2.5V

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: The EN/UV pin threshold must be met to ensure device operation.

Note 3: Maximum junction temperature limits operating conditions. The

regulated output voltage specification does not apply for all possible

combinations of input voltage and output current, especially due to the

internal current limit foldback which starts to decrease current limit at

VIN – VOUT > 12V. If operating at maximum output current, limit the input

voltage range. If operating at the maximum input voltage, limit the output

current range.

Note 4: OUTS ties directly to OUT.

Note 5: Dropout voltage is the minimum input-to-output differential

voltage needed to maintain regulation at a specified output current. The

dropout voltage is measured when output is 1% out of regulation. This

definition results in a higher dropout voltage compared to hard dropout —

which is measured when VIN = VOUT(NOMINAL). For lower output voltages,

below 1.5V, dropout voltage is limited by the minimum input voltage

specification. Please consult the Typical Performance Characteristics

for curves of dropout voltage as a function of output load current and

temperature measured in a typical application circuit.

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