LP3986

SNVS142U – AUGUST 2001 – REVISED FEBRUARY 2013

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Operating Ratings

(1) (2)

VIN

2.7 to 6V

VEN

0 to (VIN+ 0.3V) ≤ 6V

Junction Temperature

−40°C to +125°C

Thermal Resistance

θJA

220°C/W

Maximum Power Dissipation (3)

250mW

(1)

Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which

operation of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits

and associated test conditions, see Electrical Characteristics.

(2)

All voltages are with respect to the potential at the GND pin.

(3)

Like the Absolute Maximum power dissipation, the maximum power dissipation for operation depends on the ambient temperature. The

250mW rating appearing under Operating Ratings results from substituting the maximum junction temperature for operation, 125°C, for

TJ, 70°C for TA, and 220°C/W for θJA into (1) above. More power can be dissipated at ambient temperatures below 70°C . Less power

can be dissipated at ambient temperatures above 70°C. The maximum power dissipation for operation can be increased by 4.5mW for

each degree below 70°C, and it must be derated by 4.5mW for each degree above 70°C.

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

−2.5

2.5

% of

Tolerance

−3.0

3.0

VOUT(nom)

Line Regulation Error(3)

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

0.006

0.092

ΔVOUT

%/V

IOUT = 1 mA

0.128

Load Regulation Error(4)

IOUT = 1mA to 150 mA

0.003

0.006

%/mA

0.01

Output AC Line Regulation

VIN = VOUT(nom) + 1V,

1.5

mVP-P

IOUT = 150 mA (Figure 1)

VIN = 3.1V,

60

f = 1 kHz,

IOUT = 50 mA (Figure 2)

PSRR

Power Supply Rejection Ratio

dB

VIN = 3.1V,

50

f = 10 kHz,

IOUT = 50 mA (Figure 2)

IQ

Quiescent Current

Both Regulators ON

115

200

VEN = 1.4V, IOUT = 0 mA

Both Regulators ON

220

320

VEN = 1.4V, IOUT = 0 to 150 mA

One Regulator ON

75

130

µA

VEN = 1.4V IOUT = 0 mA

One Regulator ON

130

200

VEN = 1.4V IOUT = 0 to 150 mA

VEN = 0.4V, Both Regulators OFF

0.001

2

(shutdown)

4

Dropout Voltage(5)

IOUT = 1 mA

0.4

2

mV

IOUT = 150 mA

60

100

ISC

Short Circuit Current Limit

Output Grounded

600

mA

(1)

All limits are guaranteed. 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 guaranteed 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)

The output voltage changes slightly with line voltage. An increase in the line voltage results in a slight increase in the output voltage and

vice versa.

(4)

The output voltage changes slightly with load current. An increase in the load current results in a slight decrease in the output voltage

and vice versa. Tested limit applies to Vout 's of 2.5V and greater.

(5)

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

4

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