參數(shù)資料
型號： LQA48B
廠商： National Semiconductor Corporation
英文描述： Cellular Phone Power Management Unit
中文描述： 蜂窩電話電源管理單元
文件頁數(shù)： 12/32頁
文件大?。?/td> 761K
代理商： LQA48B
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
= 25C. Limits
appearing in
boldface
type apply over the entire junction temperature range for operation, 40 to +125C. (Notes 2, 8, 9)
Symbol
V
OUT
Accuracy
I
Q
I
OUT
Parameter
Condition
Min
Typ
Max
Units
Output Voltage
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
Quiescent Current
Output Current
Output Current Limit
Dropout Voltage
Power Supply Ripple
Rejection Ratio
Output Capacitance
Output Capacitor ESR
Note:
The RTC_LDO can be disabled via the I
2
C compatible interface by setting the corresponding disable bit. See
Table 1
for further details.
2.6
10
2000
150
6
50
μA
μA
1000
10000
190
V
IN
–V
RTC
PSRR
mV
20
dB
C
OUT
1 mA
≤
I
OUT
≤
200 mA
0.75
5
1.0
2.2
500
μF
m
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
= 25C. Limits ap-
pearing in
boldface
type apply over the entire junction temperature range for operation, 40 to +125C. (Notes 2, 8, 9)
Symbol
V
IN
Parameter
Condition
Min
Typ
V
OUT
+
0.4
Max
Units
Operational Voltage Range
5.5
V
V
OUT
Accuracy
I
Q
I
OUT
Output Voltage
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
0 μA
≤
I
OUT
≤
100 μA
3.0
3.15
3.3
V
Quiescent Current
Output Current
25
μA
70
150
μA
Output Current Limit
0.7
1.5
2
mA
PSRR
Power Supply Ripple
Rejection Ratio
15
dB
C
OUT
Output Capacitance
Output Capacitor ESR
Note:
The back-up battery charger can be disabled by setting the corresponding enable bit ‘0’ via the I
2
C interface. See
Table 1
for further details.
0.1
μF
m
5
500
Comparators’ Electrical Characteristics
Unless otherwise noted, V
= +2.5V to 5.5V, V
= 3.0V, V
= 0.27V. Typical values and limits appearing in normal type
apply for T
= 25C. Limits appearing in
boldface
type apply over the entire junction temperature range for operation, 40 to
+125C. (Notes 2, 8, 9)
Symbol
V
T
I
B
I
OS
PSRR
V
OL
V
OH
t
PLH
t
PHL
t
LH
Parameter
Condition
Min
230
Typ
270
0.01
1
50
0.24
Max
300
0.15
Units
mV
μA
nA
dB
V
V
μs
μs
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
Rise Time Low to High
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)
Overdrive = 100 mV
C
OUT
= 10 pF (Note 10)
Overdrive = 100 mV
C
OUT
= 10 pF (Note 10)
0.37
3
2.57
V
O3
–0.25
5
5
5
ns
t
HL
Fall Time High to Low
5
ns
L
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