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參數(shù)資料
| 型號： | LP3971SQ-A514 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | POWER MANAGEMENT UNIT FOR ADVANCED APPLICATION PROCESSORS |
| 中文描述： | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC40 |
| 封裝： | 5 X 5 MM, LLP-40 |
| 文件頁數(shù)： | 9/42頁 |
| 文件大?。?/td> | 1350K |
| 代理商： | LP3971SQ-A514 |
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LDO 1 to 5
Unless otherwise noted, V
IN
= 3.6V, C
IN
= 1.0 μF, C
OUT
= 0.47 μF, C
(V
RTC
) = 1.0 μF ceramic. 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, 40C to +125C. (Notes 2, 6, 7, 10, 11, 15) and (Note 16).
Symbol
V
OUT
Accuracy
V
OUT
Parameter
Conditions
Min
3
Typ
Max
3
Units
%
Output Voltage Accuracy (Default
V
OUT
)
Line Regulation
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)
0.15
%/V
Load Regulation
0.011
%/mA
I
SC
Short Circuit Current Limit
400
500
mA
V
IN
-
V
OUT
PSRR
I
Q
Dropout Voltage
150
mV
Power Supply Ripple Rejection
Quiescent Current “On”
Quiescent Current “On”
Quiescent Current “Off”
Turn On Time
Output Capacitor
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
0C
≤
T
J
≤
125C
40C
≤
T
J
≤
125C
ESR
45
40
60
0.03
300
0.47
dB
μA
T
ON
C
OUT
μsec
0.33
μF
0.68
5
1.0
500
M
Buck Converters SW1, SW2, SW3
Unless otherwise noted, V
= 3.6V, C
= 10 μF, C
OUT
= 10 μF, L
= 2.2 μH ceramic. Typical values and limits appearing in
normal type apply for T
= 25C. Limits appearing in
type apply over the entire junction temperature range for opera-
tion, 40C to +125C. (Notes 2, 6, 12) and (Note 13).
Symbol
V
OUT
Eff
I
SHDN
Parameter
Conditions
Min
3
Typ
Max
+3
Units
%
%
μA
MHz
Output Voltage Accuracy
Efficiency
Shutdown Supply Current
Sync Mode Clock Frequency
Default V
OUT
Load Current = 500 mA
EN is de-asserted
Synchronized from 13 MHz System
Clock
90
0.1
13
10.4
15.6
f
OSC
I
PEAK
I
Q
Internal Oscillator Frequency
Peak Switching Current Limit
Quiescent Current “On”
2.0
2.1
21
200
240
MHz
A
2.4
No Load PFM Mode
No Load PWM Mode
μA
R
DSON
(P)
R
DSON
(N)
T
ON
C
IN
C
O
Pin-Pin Resistance PFET
m
Pin-Pin Resistance NFET
150
m
Turn On Time
Input Capacitor
Output Capacitor
Start up from Shut-down
Capacitance for Stability
Capacitance for Stability
500
μsec
μF
μF
8
8
L
www.national.com
9
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