LP3971_16 Datasheet, PDF (9/52 Pages) Texas Instruments – Power Management Unit for Advanced Application Processors

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LP3971
SNVS432V – JANUARY 2006 – REVISED MAY 2013
LDO RTC
Unless otherwise noted, V_IN = 3.6V, C_IN = 1.0 μF, C_OUT = 0.47 µF, C_OUT (V_RTC) = 1.0 μF ceramic. Typical values and limits
appearing in normal type apply for T_J = 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
Conditions
Min Typ Max Units
V_OUT
Accuracy
ΔV_OUT
Output Voltage Accuracy
Line Regulation
V_IN Connected, Load Current = 1 mA
V_IN = (V_OUT nom + 1.0V) to 5.5V ⁽⁵⁾ Load
Current = 1 mA
2.632 2.8 2.968 V
0.15 %/V
Load Regulation
From Main Battery
Load Current = 1 mA to 30 mA
From Backup Battery
V_IN = 3.0V
Load Current = 1 mA to 10 mA
0.05
0.5 ^%/mA
I_SC
Short Circuit Current Limit
From Main Battery
V_IN = V_OUT +0.3V to 5.5V
From Backup Battery
100
mA
30
V_IN - V_OUT
I_Q_Max
TP1
Dropout Voltage
Load Current = 10 mA
Maximum Quiescent Current
I_OUT = 0 mA
RTC LDO Input Switched from Main Battery V_IN Falling
to Backup Battery
375 mV
30
μA
2.9
V
TP2
RTC LDO Input Switched from Backup
V_IN Rising
Battery to Main Battery
3.0
V
C_O
Output Capacitor
Capacitance for Stability
ESR
0.7 1.0
μF
5
500 mΩ
(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) V_IN 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.
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