LT3042_15 datasheet(4/30 Pages) LINER

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LT3042

3042fa

For more information www.linear.com/LT3042

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

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

220

130

270

300

180

320

250

Programmable

Current Limit

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

VIN = 2V, VOUT = 0V, RILIM = 625Ω

VIN = 2V, VOUT = 0V, RILIM = 2.5kΩ

180

125

200

220

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

µA

Reverse Output Current

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

µA

Minimum Load Required

(Note 13)

VOUT < 1V

µA

Thermal Shutdown

TJ Rising

Hysteresis

162

°C

Start-Up Time

VOUT(NOM) = 5V, ILOAD = 200mA, CSET = 0.47µF, VIN = 6V, VPGFB = 6V

VOUT(NOM) = 5V, ILOAD = 200mA, CSET = 4.7µF, VIN = 6V, VPGFB = 6V

VOUT(NOM) = 5V, ILOAD = 200mA, CSET = 4.7µF, VIN = 6V, RPG1 = 50kΩ,

RPG2 = 400kΩ (with Fast Start-Up to 90% of VOUT)

550

Thermal Regulation

10mS Pulse

–0.01

%/W

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. Linear Technology is unable to guarantee maximum

dropout voltage specifications at high currents due to production test

limitations with Kelvin-sensing the package pins. 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.

Note 6: GND pin current is tested with VIN = VOUT(NOMINAL) and a current

source load. Therefore, the device is tested while operating in dropout. This

is the worst-case GND pin current. GND pin current decreases at higher

input voltages. Note that GND pin current does not include SET pin or ILIM

pin current but Quiescent current does include them.

Note 7: SET and OUTS pins are clamped using diodes and two 25Ω series

resistors. For less than 5ms transients, this clamp circuitry can carry

more than the rated current. Refer to Applications Information for more

information.

Note 8: Adding a capacitor across the SET pin resistor decreases output

voltage noise. Adding this capacitor bypasses the SET pin resistor’s

thermal noise as well as the reference current’s noise. The output noise

then equals the error amplifier noise. Use of a SET pin bypass capacitor

also increases start-up time.

Note 9: The LT3042 is tested and specified under pulsed load conditions

such that TJ ≈ TA. The LT3042E is 100% tested at 25°C and performance

is guaranteed from 0°C to 125°C. Specifications over the –40°C to 125°C

operating temperature range are assured by design, characterization, and

correlation with statistical process controls. The LT3042I is guaranteed

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