LP3971 datasheet(11/57 Pages) TI1

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200

400

600

800

1000

1200

LOAD CURRENT (mA)

100

150

200

250

300

REG1 3.3V OUTPUT

200

400

600

800

1000

1200

LOAD CURRENT (mA)

-100

-50

100

150

200

REG1 3.3V OUTPUT

VIN = 3.6V

REG2 2.5V OUTPUT

REG3 1.3V OUTPUT

LP3971

www.ti.com

SNVS432U – JANUARY 2006 – REVISED OCTOBER 2008

LDO 1 to 5

Unless otherwise noted, VIN = 3.6V, CIN = 1.0 μF, COUT = 0.47 µF, COUT (VRTC) = 1.0 μF ceramic. 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,

−40°C to +125°C.

(1) (2) (3) (4) (5) (6) and (7).

Symbol

Parameter

Conditions

Min

Typ

Max

Units

VOUT

Output Voltage Accuracy (Default VOUT)

Load Current = 1 mA

−3

Accuracy

ΔVOUT

Line Regulation

VIN =3.1V to 5.0V,

(5) Load Current = 1 mA

0.15

%/V

Load Regulation

VIN = 3.6V,

0.011

%/mA

Load Current = 1 mA to IMAX

ISC

Short Circuit Current Limit

LDO1–4, VOUT = 0V

400

LDO5, VOUT = 0V

500

VIN - VOUT

Dropout Voltage

Load Current = 50 mA (3)

150

PSRR

Power Supply Ripple Rejection

f = 10 kHz, Load Current = IMAX

Quiescent Current “On”

IOUT = 0 mA

Quiescent Current “On”

IOUT = IMAX

µA

Quiescent Current “Off”

EN is de-asserted

0.03

TON

Turn On Time

Start up from Shut-down

300

μsec

COUT

Output Capacitor

Capacitance for Stability

0.33

0.47

0°C

≤ TJ ≤ 125°C

µF

−40°C ≤ TJ ≤ 125°C

0.68

1.0

ESR

500

Ω

(1)

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

(2)

All limits guaranteed at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits

are production tested, guaranteed through statistical analysis or guaranteed by design. All limits at temperature extremes are

guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing

Quality Level (AOQL).

(3)

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

(4)

LDO_RTC voltage can track LDO1 voltage. LP3971 has a tracking function (nIO_TRACK). When enabled, LDO_RTC voltage will track

LDO1 voltage within 200mV down to 2.8V when LDO1 is enabled

(5)

VIN minimum for line regulation values is 2.7V for LDOs 1–3 and 1.8V for LDOs 4 and 5. Condition does not apply to input voltages

below the minimum input operating voltage.

(6)

An increase in the load current results in a slight decrease in the output voltage and vice versa.

(7)

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 for input voltages below 2.7V for LDOs 1–3 and 1.8V for LDOs 4 and 5.

LDO Dropout Voltage vs. Load Current Collect Data For All LDO’s

Dropout Voltage

Change in Output Voltage

vs.

Load Current

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