LP3981 datasheet(5/21 Pages) TI

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LP3981

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SNVS159G – OCTOBER 2001 – REVISED MAY 2013

Electrical Characteristics

Unless otherwise specified: VEN = 1.2V, VIN = VOUT + 0.5V, CIN = 2.2 µF, CBP = 0.033 µF, IOUT = 1mA, COUT = 2.2 µF. Typical

values and imits appearing in standard typeface are for TJ = 25°C. Limits appearing in boldface type apply over the entire

junction temperature range for operation,

−40°C to +125°C.

(1) (2)

Limit

Symbol

Parameter

Conditions

Typ

Units

Min

Max

Output Voltage

−2

% of

Tolerance

−3

VOUT(nom)

VIN = VOUT + 0.5V to 6.0V, TA < +85°C

0.005

−0.1

0.1

%/V

ΔVOUT

Line Regulation Error

VIN = VOUT + 0.5V to 6.0V, TJ ≤125°C

−0.2

0.2

%/V

Load Regulation Error

IOUT = 1 mA to 300 mA

0.0003

0.005

%/mA

(3)

VIN = VOUT(nom) + 1V,

f = 1 kHz,

IOUT = 50 mA (Figure 4)

PSRR

Power Supply Rejection Ratio (4)

VIN = VOUT(nom) + 1V,

f = 10 kHz,

IOUT = 50 mA (Figure 4)

Quiescent Current

VEN = 1.2V, IOUT = 1 mA

120

VEN = 1.2V, IOUT = 1 to 300 mA,

170

210

µA

VOUT = 2.5V

(5)

VEN = 0.4V

0.003

1.5

IOUT = 1 mA

0.5

Dropout Voltage (6)

IOUT = 200 mA

133

IOUT = 300 mA

132

200

ISC

Short Circuit Current Limit

Output Grounded

600

(Steady State)

Output Noise Voltage

BW = 10 Hz to 100 kHz,

µVrms

CBP = 0.033µF

Thermal Shutdown Temperature

160

°C

TSD

Thermal Shutdown Hysteresis

°C

IOUT(PK)

Peak Output Current

VOUT ≥ VOUT (nom) - 5%

455

300

IEN

Maximum Input Current at VEN

VEN = 0 and VIN

0.001

µA

VIL

Logic Low Input threshold

VIN = 2.7 to 6.0V

0.4

VIH

Logic High Input threshold

VIN = 2.7 to 6.0V

1.4

TON

Turn-On Time (4) (7)

CBYPASS = 0.033 µF

240

350

µs

(1)

Min and Max Limits are specified by design, test, or statistical analysis. Typical (Typ.) numbers are not verified, but do represent the

most likely norm.

(2)

The target output voltage, which is labeled VOUT(nom), is the desired voltage option.

(3)

An increase in the load current results in a slight decrease in the output voltage and vice versa.

(4)

Specified by design. Not production tested.

(5)

For VOUT > 2.5C, Increase IQ(MAX) by 2.5µA for every 0.1V increase in VOUT(NOM).i.e. IQ(MAX) = 210 + ((VOUT(NOM) - 2.5) * 25)µA

(6)

Dropout voltage is the input-to-output voltage difference at which the output voltage is 100mV below its nominal value. This specification

does not apply for input voltages below 2.5V.

(7)

Turn-on time is time measured between the enable input just exceeding VIH and the output voltage just reaching 95% of its nominal

value.

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