LP3988 datasheet(4/15 Pages) TI1

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LP3988-Q1

SLAS928A – MARCH 2013 – REVISED JULY 2013

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Electrical Characteristics

Unless otherwise specified: VEN = 1.8 V, VIN = VOUT + 0.5 V, CIN = 1 µF, IOUT = 1 mA, COUT = 1 µF. Typical values and limits

appearing in standard typeface are for TA = 25°C. Limits appearing in boldface type apply over the entire operating

temperature range for operation,

−40°C to 125°C.

(1) (2)

Limit

Symbol

Parameter

Conditions

Units

Min

Typ

Max

Output voltage

−2

% of

tolerance

−40°C ≤ TA ≤ 125°C, SOT-23-5

−3.5

3.5

VOUT(nom)

−0.15

0.15

ΔVOUT

Line-regulation error

VIN = VOUT (NOM) + 0.5 V to 6 V

%/V

−0.2

0.2

0.005

Load-regulation error (3)

IOUT = 1 mA to 150 mA

%/mA

0.007

VIN = VOUT(nom) + 1 V,

f = 1 kHz,

IOUT = 50 mA (Figure 3)

PSRR

Power-supply rejection ratio

VIN = VOUT(nom) + 1 V,

f = 10 kHz,

IOUT = 50 mA (Figure 3)

VEN = 1.4 V, IOUT = 0 mA

120

Quiescent current

VEN = 1.4 V, IOUT = 0 to 150 mA

140

200

µA

VEN = 0.4V

0.003

1.0

IOUT = 1 mA

Dropout Voltage (4)

115

IOUT = 150 mA

150

ISC

Short Circuit Current Limit

See (5)

600

BW = 10 Hz to 100 kHz,

Output Noise Voltage

220

µVrms

COUT = 1 µF

Capacitance (6)

µF

COUT

Output Capacitor

ESR (6)

500

Ω

Thermal Shutdown Temperature

160

°C

TSD

Thermal Shutdown Hysteresis

°C

Enable Control Characteristics (7)

IEN

Maximum Input Current at EN

VEN = 0 and VIN = 6 V

0.1

µA

VIL

Logic Low Input threshold

VIN = 2.5 V to 6 V

0.5

VIH

Logic High Input threshold

VIN = 2.5 V to 6 V

1.2

Power Good

VTHL

Low threshold

% of VOUT (PG ON) Figure 2

VTHH

High Threshold

% of VOUT (PG OFF) Figure 2

(8)

VOL

PG Output Logic Low Voltage

IPULL-UP = 100 µA, fault condition

0.02

0.1

IPGL

PG Output Leakage Current

PG off, VPG = 6 V

0.02

µA

tON

Power Good Turn On time, (4)

VIN = 4.2V

µs

tOFF

Power Good Turn Off time, (4)

VIN = 4.2V

µs

(1)

All limits are specified. All electrical characteristics having room-temperature limits are tested during production with TA = 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 100 mV below its nominal value.

(5)

Short-circuit current is measured on input supply line after pulling down VOUT to 95% VOUT(nom).

(6)

Specified by design. The capacitor tolerance should be ±30% or better over the full temperature range. The full range of operating

conditions such as temperature, dc bias and even capacitor case size for the capacitor in the application should be considered during

device selection to ensure this minimum capacitance specification is met. X7R capacitor types are recommended to meet the full device

temperature range.

(7)

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

value.

(8)

The low and high thresholds are generated together. Typically a 2.6% difference is seen between these thresholds.

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