LP3941 Datasheet, PDF (13/34 Pages) Texas Instruments – Cellular Phone Power Management Unit

V_RTC LDO Electrical Characteristics
Unless otherwise noted, 2.5V < V_{BU_BAT} < 3.3V. 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 to +125°C. (Note 2, Note 8, Note
9)
Symbol
Parameter
Condition
Min
Typ
Max
Units
V_OUT
Output Voltage
Accuracy
I_Q
I_OUT
V_IN–V_RTC
PSRR
Quiescent Current
Output Current
Output Current Limit
Dropout Voltage
Power Supply Ripple
Rejection Ratio
I_OUT ≤ 50 µA, V_OUT = 1.8V
2.15V ≤ V_BU-BAT ≤ 3.3V
I_OUT = 6 µA
2.15V ≤ V_BU-BAT ≤ 3.3V
V_OUT = 0V
I_OUT = 50 mA
f = 100 Hz, C_OUT = 1.0 µF
1.6
1.8
2.0
V
2.6
6
µA
10
50
µA
1000
2000 10000
150
190
mV
20
dB
C_OUT
Output Capacitance
Output Capacitor ESR
1 mA ≤ I_OUT ≤ 200 mA
0.75
1.0
2.2
µF
5
500
mΩ
Note: The RTC_LDO can be disabled via the I²C compatible interface by setting the corresponding disable bit. See Table 1 for further details.
Back-Up Charger Electrical Characteristics
Unless otherwise noted, V_IN = V_BATT = 3.6V. 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 to +125°C. (Note 2, Note 8, Note 9)
Symbol
Parameter
Condition
Min
Typ
Max
Units
V_IN
Operational Voltage Range
V_OUT +
5.5
V
0.4
V_OUT
Output Voltage
Accuracy
I_Q
Quiescent Current
I_OUT
Output Current
Output Current Limit
PSRR
Power Supply Ripple
Rejection Ratio
I_OUT ≤ 50 µA, V_OUT = 3.15V
V_OUT + 0.4 ≤ V_BATT ≤ 5.5V
I_OUT < 50 µA
V_OUT + 0.4 ≤ V_BATT = V_IN ≤ 5.5V,
V_OUT = 3.0V
3.2V ≤ V_BATT = V_IN ≤ 5.5V
V_OUT = 0V
I_OUT ≤ 50 µA, V_OUT = 3.15V
V_OUT + 0.4 ≤ V_BATT = V_IN ≤ 5.5V
f < 10 kHz
3.0
3.15
3.3
V
25
µA
70
150
µA
mA
0.7
1.5
2
15
dB
C_OUT
Output Capacitance
Output Capacitor ESR
0 µA ≤ I_OUT ≤ 100 µA
0.1
µF
5
500
mΩ
Note: The back-up battery charger can be disabled by setting the corresponding enable bit ‘0’ via the I²C interface. See Table 1 for further details.
Comparators' Electrical Characteristics
Unless otherwise noted, V_BATT = +2.5V to 5.5V, V_O3 = 3.0V, V_CM = 0.27V. 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 to +125°C.
(Note 2, Note 8, Note 9)
Symbol
Parameter
Condition
Min
Typ
Max
Units
V_T
I_B
I_OS
PSRR
V_OL
V_OH
t_PLH
t_PHL
Comparator Trip Voltage
Input Bias Current
Input Offset Current
Power Supply Rejection Ratio
Output Voltage Low
Output Voltage High
Propagation Delay Low to High
Propagation Delay High to Low
V_INV = 1.3V
2.7V ≤ V_BATT ≤ 5.5V
I_SINK = 1 mA
I_SOURCE = 1 mA
Overdrive = 100 mV (Note 10)
Overdrive = 100 mV (Note 10)
230
270
300
mV
0.01
0.15
µA
1
nA
50
dB
0.24
0.37
V
2.57 V_O3–0.25
3
V
5
µs
5
µs
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200945 Version 4 Revision 2 Print Date/Time: 2011/10/25 13:09:13