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PDF LP3972 Data sheet ( Hoja de datos )
| Número de pieza | LP3972 | |
| Descripción | Power Management Unit | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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www.DataSheet4U.com
September 2006
LP3972
Power Management Unit for Advanced Application
Processors
General Description
The LP3972 is a multi-function, programmable Power Man-
agement Unit, designed especially for advanced application
processors. The LP3972 is optimized for low power hand-
held applications and provides 6 low dropout, low noise
linear regulators, three DC/DC magnetic buck regulators, a
back-up battery charger and two GPIO’s. A high speed serial
interface is included to program individual regulator output
voltages as well as on/off control.
Key Specifications
Buck Regulators
n Programmable VOUT from 0.725 to 3.3V
n Up to 95% efficiency
n Up to 1.6A output current
n ±3% output voltage accuracy
LDO’s
n Programmable VOUT of 1.0V–3.3V
n ±3% output voltage accuracy
n 150/300/400 mA output currents
— LDO RTC 30 mA
— LDO 1 300 mA
— LDO 2 150 mA
— LDO 3 150 mA
— LDO 4 150 mA
— LDO 5 400 mA
n 100 mV (typ) dropout
Features
n Compatible with advanced applications processors
requiring DVM (Dynamic Voltage Management)
n Three buck regulators for powering high current
processor functions or I/O’s
n 6 LDO’s for powering RTC, peripherals, and I/O’s
n Backup battery charger with automatic switch for
lithium-manganese coin cell batteries and Super
capacitors
n I2C compatible high speed serial interface
n Software control of regulator functions and settings
n Precision internal reference
n Thermal overload protection
n Current overload protection
n Tiny 40-pin 5x5 mm LLP package
Applications
n PDA phones
n Smart phones
n Personal Media Players
n Digital cameras
n Application processors
— Intel Xscale
— Freescale
— Samsung
© 2006 National Semiconductor Corporation DS202076
www.national.com
1 page  
Ordering Information
Voltage Option Order Number
Package Type
Voltage A514
Voltage A514
Voltage A413
Voltage A413
Voltage E514
Voltage E514
Voltage I514
Voltage I514
LP3972SQ-A514
LP3972SQX-A514
LP3972SQ-A413
LP3972SQX-A413
LP3972SQ-E514
LP3972SQX-E514
LP3972SQ-I514
LP3972SQX-I514
40 lead LLP
40 lead LLP
40 lead LLP
40 lead LLP
40 lead LLP
40 lead LLP
40 lead LLP
40 lead LLP
NSC Package
Drawing
SQF040A
SQF040A
SQF040A
SQF040A
SQF040A
SQF040A
SQF040A
SQF040A
Package Marking Supplied As
72-A514
72-A514
72-A413
72-A413
72-E514
72-E514
72-I514
72-I514
1000 tape & reel
4500 tape & reel
1000 tape & reel
4500 tape & reel
1000 tape & reel
4500 tape & reel
1000 tape & reel
4500 tape & reel
Default VOUT Coding
Z
0
1
2
3
4
5
6
7
8
9
Default VOUT
1.3
1.8
2.5
2.8
3.0
3.3
1.0
1.4
1.2
1.25
20207605
5 www.national.com
5 Page 
LDO 1 to 5
Unless otherwise noted, VIN = 3.6V, CIN = 1.0 µF, COUT = 0.47 µF, COUT (VRTC) = 1.0 µF ceramic. Typical values and limits
appearing in normal type apply for TJ = 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
VOUT
Accuracy
∆VOUT
Parameter
Output Voltage Accuracy (Default
VOUT)
Line Regulation
Load Regulation
ISC Short Circuit Current Limit
VIN -
VOUT
PSRR
IQ
TON
COUT
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
VIN =3.1V to 5.0V, (Note 11) Load
Current = 1 mA
VIN = 3.6V,
Load Current = 1 mA to IMAX
LDO1–4, VOUT = 0V
LDO5, VOUT = 0V
Load Current = 50 mA (Note 7)
f = 10 kHz, Load Current = IMAX
IOUT = 0 mA
IOUT = IMAX
EN is de-asserted
Start up from Shut-down
Capacitance for Stability
0˚C ≤ TJ ≤ 125˚C
−40˚C ≤ TJ ≤ 125˚C
ESR
Min
−3
0.33
0.68
5
Typ
400
500
45
40
60
0.03
300
0.47
1.0
Max
3
0.15
0.011
Units
%
%/V
%/mA
mA
150 mV
dB
µA
µsec
µF
500 mΩ
LDO dropout voltage vs. Load Current collect data for all LDO’s
Dropout Voltage vs. Load Current
Change in Output Voltage vs. Load Current
20207629
11
20207630
www.national.com
11 Page | ||
| Páginas | Total 59 Páginas | |
| PDF Descargar | [ Datasheet LP3972.PDF ] | |
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