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)： 8/32頁
文件大小： 761K
代理商： LQA48B
V
O4
LDO 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
OUT
Accuracy
V
OUT
Range
I
OUT
Parameter
Condition
Min
Typ
Max
Units
Output Voltage
1 mA
≤
I
OUT
≤
50 mA, V
OUT
= 2.2V
3.0V
≤
V
BATT
= V
IN
≤
5.5V
0 μA
≤
I
OUT
≤
50 mA
Programming Resolution = 100 mV
(V
OUT
+ 0.25V, 3.0V)
MAX
≤
V
BATT
V
BATT
= V
IN
≤
5.5V
V
OUT
= 0V
I
OUT
= 25 mA
(V
OUT
+ 0.25V, 3.0V)
MAX
≤
V
BATT
V
BATT
= V
IN
≤
5.5V, I
OUT
= 25 mA
V
IN
= 3.6V, 1 mA
≤
I
OUT
≤
50 mA
10 Hz
≤
f
≤
100 kHz,
C
OUT
= 1.0 μF
f = 217 Hz, C
OUT
= 1.0 μF
3
±
1.0
+3
%
Programmable Output Voltage
Range
Output Current
1.5
3.0
3.0
V
50
mA
Output Current Limit
Dropout Voltage
Line Regulation
140
7
V
IN
–V
OUT
V
OUT
90
mV
3
mV
Load Regulation
Output Noise Voltage
4
31
e
N
27
μV
RMS
PSRR
Power Supply Ripple
Rejection Ratio
Ground Current
Output Capacitance
Output Capacitor ESR
56
dB
I
GND
C
OUT
I
OUT
= 100 μA
0 μA
≤
I
OUT
≤
50 mA
30
μA
μF
m
1
5
20
500
t
START-UP
Start-Up Time from Shutdown
C
OUT
= 1.0 μF, I
OUT
= 50 mA (Note
10)
60
μs
V
O5
LDO Electrical Characteristics
Unless otherwise noted, V
= V
= 3.6V. Typical values and limits appearing in normal type apply for T
= 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
OUT
Accuracy
V
OUT
Range
I
OUT
Parameter
Condition
Min
Typ
Max
Units
Output Voltage
1 mA
≤
I
OUT
≤
50 mA, V
OUT
= 2.2V
3.0V
≤
V
BATT
= V
IN
≤
5.5V
0 μA
≤
I
OUT
≤
50 mA
Programming Resolution = 100 mV
(V
OUT
+ 0.25V, 3.0V)
MAX
≤
V
BATT
V
BATT
= V
IN
≤
5.5V
V
OUT
= 0V
I
OUT
= 25 mA
(V
OUT
+ 0.25V, 3.0V)
MAX
≤
V
BATT
V
BATT
= V
IN
≤
5.5V, I
OUT
= 25 mA
V
IN
= 3.6V, 1 mA
≤
I
OUT
≤
50 mA
10 Hz
≤
f
≤
100 kHz,
C
OUT
= 1.0 μF
f = 217 Hz, C
OUT
= 1.0 μF
3
±
1.0
+3
%
Programmable Output Voltage
Range
Output Current
2.5
2.8
3.2
V
50
mA
Output Current Limit
Dropout Voltage
Line Regulation
160
7
V
IN
–V
OUT
V
OUT
90
mV
3
mV
Load Regulation
Output Noise Voltage
4
31
e
N
27
μV
RMS
PSRR
Power Supply Ripple
Rejection Ratio
Ground Current
Output Capacitance
Output Capacitor ESR
56
dB
I
GND
C
OUT
I
OUT
= 100 μA
0 μA
≤
I
OUT
≤
50 mA
30
μA
μF
m
1
5
20
500
t
START-UP
Start-Up Time from Shutdown
C
OUT
= 1.0 μF, I
OUT
= 50 mA (Note
10)
60
μs
Note:
This LDO will be ON after start-up by default.
Note:
This LDO has an external active high enable pin, V
-EN as well as the internal register enable bit. The LDO is on if either of these is “1” (OR-function). The
enable bit is “1” by default and can be disabled via the register file.
L
www.national.com
8
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