LP3971 Datasheet, PDF (11/57 Pages) National Semiconductor (TI) – POWER MANAGEMENT UNIT FOR ADVANCED APPLICATION PROCESSORS

LP3971
www.ti.com
SNVS432U – JANUARY 2006 – REVISED OCTOBER 2008
LDO 1 to 5
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) (4) (5) (6)} and ⁽⁷⁾.
Symbol
Parameter
Conditions
Min Typ Max Units
V_OUT
Accuracy
ΔV_OUT
I_SC
V_IN - V_OUT
PSRR
I_Q
Output Voltage Accuracy (Default V_OUT)
Line Regulation
Load Regulation
Short Circuit Current Limit
Dropout Voltage
Power Supply Ripple Rejection
Quiescent Current “On”
Quiescent Current “On”
Quiescent Current “Off”
Load Current = 1 mA
−3
3
%
V_IN =3.1V to 5.0V, ⁽⁵⁾ Load Current = 1 mA
V_IN = 3.6V,
Load Current = 1 mA to I_MAX
LDO1–4, V_OUT = 0V
LDO5, V_OUT = 0V
Load Current = 50 mA ⁽³⁾
f = 10 kHz, Load Current = I_MAX
I_OUT = 0 mA
I_OUT = I_MAX
EN is de-asserted
0.15 %/V
0.011 %/mA
400
mA
500
150 mV
45
dB
40
60
µA
0.03
T_ON
C_OUT
Turn On Time
Output Capacitor
Start up from Shut-down
Capacitance for Stability
0°C ≤ T_J ≤ 125°C
−40°C ≤ T_J ≤ 125°C
ESR
300
μsec
0.33 0.47
µF
0.68 1.0
5
500 mΩ
(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) 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.
(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
vs.
Load Current
300
Change in Output Voltage
vs.
Load Current
200
250
150
200
150
100
REG1 3.3V OUTPUT
50
0
0 200 400 600 800 1000 1200
LOAD CURRENT (mA)
100
REG1 3.3V OUTPUT
50
REG2 2.5V OUTPUT
REG3 1.3V OUTPUT
0
-50
V_IN = 3.6V
-100
0 200 400 600 800 1000 1200
LOAD CURRENT (mA)
Copyright © 2006–2008, Texas Instruments Incorporated
Product Folder Links: LP3971
Submit Documentation Feedback
11