LP3971

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SNVS432V – JANUARY 2006 – REVISED MAY 2013

LDO RTC

range for operation,

−40°C to +125°C.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Output Voltage Accuracy

2.632

2.8

2.968

V

Accuracy

Line Regulation

0.15

%/V

Current = 1 mA

Load Regulation

From Main Battery

0.05

Load Current = 1 mA to 30 mA

%/mA

From Backup Battery

0.5

Load Current = 1 mA to 10 mA

Short Circuit Current Limit

From Main Battery

100

mA

From Backup Battery

30

Dropout Voltage

Load Current = 10 mA

375

mV

Maximum Quiescent Current

30

μA

TP1

2.9

V

to Backup Battery

TP2

RTC LDO Input Switched from Backup

3.0

V

Battery to Main Battery

Output Capacitor

Capacitance for Stability

0.7

1.0

μF

ESR

5

500

m

Ω

(1)

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

(2)

All limits specified at room temperature and at temperature extremes. All room temperature limits are production tested, specified

through statistical analysis or by design. All limits at temperature extremes are specified 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)

below the minimum input operating voltage.

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