LP3972_14 datasheet(9/59 Pages) TI1

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LP3972

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SNVS468J – SEPTEMBER 2006 – REVISED AUGUST 2011

LDO RTC (continued)

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) and (4)

Symbol

Parameter

Test Conditions

Min

Typ

Max

Unit

ΔVOUT

Line Regulation

VIN = (VOUT nom + 1.0V) to 5.5V

(5) Load

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

VIN = 3.0V

Load Current = 1 mA to 10 mA

ISC

Short Circuit Current Limit

From Main Battery

100

VIN = VOUT +0.3V to 5.5V

From Backup Battery

VIN - VOUT

Dropout Voltage

Load Current = 10 mA

375

IQ_Max

Maximum Quiescent Current

IOUT = 0 mA

µA

TP1

RTC LDO Input Switched from

VIN Falling

2.9

Main Battery to Backup Battery

TP2

RTC LDO Input Switched from

VIN Rising

3.0

Backup Battery to Main Battery

Output Capacitor

Capacitance for Stability

0.7

1.0

µF

ESR

500

Ω

(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.

LDOs 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

Test Conditions

Min

Typ

Max

Unit

VOUT Accuracy Output Voltage Accuracy

Load Current = 1 mA

−3

(Default VOUT)

ΔVOUT

Line Regulation

VIN =3.1V to 5.0V,

(5),

0.15

%/V

Load Current = 1 mA

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

(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 LDO3 voltage. LP3972 has a tracking function (nIO_TRACK). When enabled, LDO_RTC voltage will track

LDO3 voltage within 200mV down to 2.8V when LDO3 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.

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