LP3971 Datasheet, PDF (9/42 Pages) National Semiconductor (TI) – POWER MANAGEMENT UNIT FOR ADVANCED APPLICATION PROCESSORS

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. (Notes 2, 6, 7, 10, 11, 15) and (Note 16).
Symbol
V_OUT
Accuracy
∆V_OUT
Parameter
Output Voltage Accuracy (Default
V_OUT)
Line Regulation
Load Regulation
I_SC
Short Circuit Current Limit
V_IN -
V_OUT
PSRR
I_Q
T_ON
C_OUT
Dropout Voltage
Power Supply Ripple Rejection
Quiescent Current “On”
Quiescent Current “On”
Quiescent Current “Off”
Turn On Time
Output Capacitor
Conditions
Load Current = 1 mA
V_IN =3.1v to 5.0V, (Note 11) 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 (Note 7)
f = 10 kHz, Load Current = I_MAX
I_OUT = 0 mA
I_OUT = I_MAX
EN is de-asserted
Start up from Shut-down
Capacitance for Stability
0˚C ≤ T_J ≤ 125˚C
−40˚C ≤ T_J ≤ 125˚C
ESR
Min
−3
0.33
0.68
5
Typ
Max
Units
3
%
0.15
%/V
0.011 %/mA
400
mA
500
150
mV
45
dB
40
60
µA
0.03
300
µsec
0.47
µF
1.0
500
MΩ
Buck Converters SW1, SW2, SW3
Unless otherwise noted, V_IN = 3.6V, C_IN = 10 µF, C_OUT = 10 µF, L_OUT = 2.2 µH 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 opera-
tion, −40˚C to +125˚C. (Notes 2, 6, 12) and (Note 13).
Symbol
V_OUT
Eff
I_SHDN
Parameter
Output Voltage Accuracy
Efficiency
Shutdown Supply Current
Sync Mode Clock Frequency
f_OSC
I_PEAK
I_Q
Internal Oscillator Frequency
Peak Switching Current Limit
Quiescent Current “On”
R_DSON
(P)
R_DSON
(N)
T_ON
C_IN
C_O
Pin-Pin Resistance PFET
Pin-Pin Resistance NFET
Turn On Time
Input Capacitor
Output Capacitor
Conditions
Min
Typ
Max
Units
Default V_OUT
Load Current = 500 mA
−3
+3
%
90
%
EN is de-asserted
0.1
µA
Synchronized from 13 MHz System 10.4
13
15.6
MHz
Clock
2.0
MHz
2.1
2.4
A
No Load PFM Mode
No Load PWM Mode
21
µA
200
240
mΩ
150
mΩ
Start up from Shut-down
Capacitance for Stability
Capacitance for Stability
500
8
8
µsec
µF
µF
9
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