LP3921

www.ti.com

SNVS580A – AUGUST 2008 – REVISED MAY 2013

LDO1 (CORE) Electrical Characteristics (continued)

Unless otherwise noted, VIN (=VIN1=VIN2=BATT=VDD) = 3.6V, GND = 0V, CVIN1-2=10 µF, CLDOX=1 µF. Note VINMIN is the

greater of 3.0V or VOUT1+ 0.5V. Typical values and limits appearing in normal type apply for TJ = 25°C. Limits appearing in

boldface type apply over the entire junction temperature range for operation, TA = TJ = −40°C to +125°C.

(1)

Limit

Symbol

Parameter

Condition

Typ

Units

Min

Max

IOUT1

Output Current

VINMIN ≤ VIN ≤ 5.5V

300

mA

Output Current Limit

VOUT1 = 0V

600

VDO1

Dropout Voltage

IOUT1 = 300 mA

(2)

220

310

mV

ΔVOUT1

Line Regulation

VINMIN ≤ VIN ≤ 5.5V

2

mV

IOUT1 = 1 mA

Load Regulation

1 mA

≤ IOUT1 ≤ 300 mA

10

mV

en1

Output Noise Voltage

10 Hz

≤ f≤ 100 kHz,

45

µVRMS

COUT = 1 µF

(3)

PSRR

Power Supply

F = 10 kHz, COUT = 1 µF

65

dB

Rejection Ratio

IOUT1 = 20 mA

(3)

tSTART-UP

Start-Up Time from

COUT = 1 µF, IOUT1 = 300 mA

60

170

µs

Internal Enable

(4)

TTransient

Start-Up Transient

COUT = 1 µF,

60

120

mV

Overshoot

IOUT1 = 300 mA

(3)

(2)

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

specification does not apply in cases it implies operation with an input voltage below the 3.0V minimum appearing under Operating

Ratings. For example, this specification does not apply for devices having 1.5V outputs because the specification would imply operation

with an input voltage at or about 1.5V.

(3)

Specified by design.

(4)

Specified by design.

LDO2 (DIGI) Electrical Characteristics

Unless otherwise noted, VIN (=VIN1=VIN2=BATT=VDD) = 3.6V, GND = 0V, CVIN1-2=10 µF, CLDOX=1 µF. Note VINMIN is the

greater of 3.0V or VOUT2+ 0.5V. Typical values and limits appearing in normal type apply for TJ = 25°C. Limits appearing in

boldface type apply over the entire junction temperature range for operation, TA = TJ = −40°C to +125°C.

(1)

Limit

Symbol

Parameter

Condition

Typ

Units

Min

Max

VOUT2

Output Voltage

IOUT2 = 1 mA, VOUT2= 3.0V

−2

+2

%

Accuracy

−3

+3

Output Voltage

Default

3

V

IOUT2

Output Current

VINMIN ≤ VIN ≤ 5.5V

300

mA

Output Current Limit

VOUT2 = 0V

600

VDO2

Dropout Voltage

IOUT2 = 300 mA

(2)

220

310

mV

ΔVOUT2

Line Regulation

VINMIN ≤ VIN ≤ 5.5V

2

mV

IOUT2 = 1mA

Load Regulation

1 mA

≤ IOUT2 ≤ 300 mA

10

mV

en2

Output Noise Voltage

10 Hz

≤ f≤ 100 kHz,

45

µVRMS

COUT = 1 µF

(3)

PSRR

Power Supply

F = 10 kHz, COUT = 1 µF

65

dB

Rejection Ratio

IOUT2 = 20 mA

(3)

(1)

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

cold limits are specified by correlating the electrical characteristics to process and temperature variations and applying statistical process

control.

(2)

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

specification does not apply in cases it implies operation with an input voltage below the 3.0V minimum appearing under Operating

Ratings. For example, this specification does not apply for devices having 1.5V outputs because the specification would imply operation

with an input voltage at or about 1.5V.

(3)

Specified by design.

Copyright © 2008–2013, Texas Instruments Incorporated

Submit Documentation Feedback

9

Product Folder Links: LP3921