LP3921 datasheet(10/41 Pages) TI1

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LP3921

SNVS580A – AUGUST 2008 – REVISED MAY 2013

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LDO2 (DIGI) 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 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

tSTART-UP

Start-Up Time from

COUT = 1 µF, IOUT2 = 300 mA

(3)

µs

Shutdown

tTransient

Start-Up Transient

COUT = 1 µF, IOUT2 = 300 mA

(3)

Overshoot

LDO3 (ANA), LDO4 (TCXO) Electrical Characteristics

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

VINMIN is the greater of 3.0V or VOUT3/4 + 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

VOUT3, VOUT4

Output Voltage

IOUT3/4 = 1 mA, VOUT3/4= 3.0V

−2

Accuracy

−3

Output Voltage

LDO3 default

LDO4 default

IOUT3, IOUT4

Output Current

VINMIN ≤ VIN ≤ 5.5V

Output Current Limit

VOUT3/4 = 0V

160

VDO3, VDO4

Dropout Voltage

IOUT3/4 = 80 mA

(2)

220

310

ΔVOUT3 , ΔVOUT4

Line Regulation

VINMIN ≤ VIN ≤ 5.5V

IOUT3/4 = 1 mA

Load Regulation

1mA

≤ IOUT3/4 ≤ 80 mA

en3,en4

Output Noise Voltage

10 Hz

≤ f ≤ 100 kHz,

µVRMS

COUT = 1 µF

(3)

PSRR

Power Supply

F = 10 kHz, COUT = 1 µF

Rejection Ratio

IOUT3/4 = 20 mA

(3)

tSTART-UP

Start-Up Time from

COUT = 1 µF, IOUT3/4 = 80mA

µs

Enable(3)

tTransient

Start-Up Transient

COUT = 1µF, IOUT3/4 = 80 mA

Overshoot

(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.

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