LP3985 datasheet(6/29 Pages) TI

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LP3985

SNVS087AC – OCTOBER 2000 – REVISED MAY 2013

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Electrical Characteristics

Unless otherwise specified: VIN = VOUT(nom) + 0.5V, CIN = 1 µF, IOUT = 1mA, COUT = 1 µF, CBYPASS = 0.01µF. Typical values and

limits 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

IOUT = 1mA

−2

% of

Tolerance

−3

VOUT(nom)

Line Regulation Error

VIN = (VOUT(nom) + 0.5V) to 6.0V,

For 4.7 to 5.0 options

−0.19

0.19

%/V

ΔVOUT

For all other options

−0.1

0.1

Load Regulation Error(3)

IOUT = 1 mA to 150 mA

0.0025

0.005

LP3985IM5 (SOT23-5)

%/mA

LP3985 (DSBGA)

0.0004

0.002

Output AC Line Regulation

VIN = VOUT(nom) + 1V,

1.5

mVP-P

IOUT = 150 mA (Figure 5)

VIN = VOUT(nom) + 0.2V,

f = 1 kHz,

IOUT = 50 mA (Figure 6)

PSRR

Power Supply Rejection Ratio

VIN = VOUT(nom) + 0.2V,

f = 10 kHz,

IOUT = 50 mA (Figure 6)

Quiescent Current

VEN = 1.4V, IOUT = 0 mA

For 4.7 to 5.0 options

100

165

For all other options

150

VEN = 1.4V, IOUT = 0 to 150 mA

µA

For 4.7 to 5.0 options

155

250

For all other options

140

200

VEN = 0.4V

0.003

1.5

Dropout Voltage(4)

IOUT = 1 mA

0.4

IOUT = 50 mA

IOUT = 100 mA

IOUT = 150 mA

100

ISC

Short Circuit Current Limit

Output Grounded

600

(Steady State)

IOUT(PK)

Peak Output Current

VOUT ≥ VOUT(nom) - 5%

550

300

TON

Turn-On Time(5)

CBYPASS = 0.01 µF

200

µs

Output Noise Voltage(6)

BW = 10 Hz to 100 kHz,

µVrms

COUT = 1µF

Output Noise Density

CBP = 0

230

nV/

√Hz

IEN

Maximum Input Current at EN

VEN = 0.4 and VIN = 6.0

±1

VIL

Maximum Low Level Input Voltage VIN = 2.5 to 6.0V

0.4

at EN

VIH

Minimum High Level Input Voltage VIN = 2.5 to 6.0V

1.4

at EN

Thermal Shutdown Temperature

160

°C

TSD

Thermal Shutdown Hysteresis

°C

(1)

All limits are verified. All electrical characteristics having room-temperature limits are tested during production with TJ = 25°C or

correlated using Statistical Quality Control (SQC) methods. All hot and cold limits are specified by correlating the electrical

characteristics to process and temperature variations and applying statistical process control.

(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)

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.

(5)

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

value.

(6)

The output noise varies with output voltage option. The 30µVrms is measured with 2.5V voltage option. To calculate an approximated

output noise for other options, use the equation: (30µVrms)(X)/2.5, where X is the voltage option value.

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