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PDF LP2980 Data sheet ( Hoja de datos )
| Número de pieza | LP2980 | |
| Descripción | Micropower 50 mA Ultra Low-Dropout Regulator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LP2980 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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April 2000
LP2980
Micropower 50 mA Ultra Low-Dropout Regulator
General Description
The LP2980 is a 50 mA, fixed-output voltage regulator de-
signed specifically to meet the requirements of
battery-powered applications.
Using an optimized VIP™ (Vertically Integrated PNP) pro-
cess, the LP2980 delivers unequaled performance in all
specifications critical to battery-powered designs:
Dropout Voltage. Typically 120 mV @ 50 mA load, and 7 mV
@ 1 mA load.
Ground Pin Current. Typically 375 µA @ 50 mA load, and 80
µA @ 1 mA load.
Sleep Mode. Less than 1 µA quiescent current when ON/
OFF pin is pulled low.
Smallest Possible Size. SOT-23 and micro SMD packages
use an absolute minimum board space.
Minimum Part Count. Requires only 1 µF of external ca-
pacitance on the regulator output.
Precision Output. 0.5% tolerance output voltages available
(A grade).
5.0V, 3.3V, and 3.0V versions available as standard prod-
ucts.
Features
n Ultra low dropout voltage
n Output voltage accuracy 0.5% (A Grade)
n Guaranteed 50 mA output current
n Smallest possible size (SOT-23, micro SMD package)
n Requires only 1 µF external capacitance
n < 1 µA quiescent current when shutdown
n Low ground pin current at all load currents
n High peak current capability (150 mA typical)
n Wide supply voltage range (16V max)
n Fast dynamic response to line and load
n Low ZOUT over wide frequency range
n Overtemperature/overcurrent protection
n −40˚C to +125˚C junction temperature range
Applications
n Cellular Phone
n Palmtop/Laptop Computer
n Personal Digital Assistant (PDA)
n Camcorder, Personal Stereo, Camera
Block Diagram
DS012078-1
Connection Diagram and Ordering Information
5-Lead Small Outline Package (M5)
micro SMD, 5 Bump Package (BPA05)
DS012078-3
Top View
See NS Package Number MF05A
For ordering information see Table 1
VIP™ is a trademark of National Semiconductor Corporation.
© 2000 National Semiconductor Corporation DS012078
DS012078-60
Bottom View
See NS Package Number BPA05
www.national.com
1 page  
Electrical Characteristics (Continued)
Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, θJA, and
the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using:
The value of θJA for the SOT-23 package is 220˚C/W and the micro SMD package is 320˚C/W. Exceeding the maximum allowable power dissipation will cause ex-
cessive die temperature, and the regulator will go into thermal shutdown.
Note 4: If used in a dual-supply system where the regulator load is returned to a negative supply, the LP2980 output must be diode-clamped to ground.
Note 5: The output PNP structure contains a diode between the VIN and VOUT terminals that is normally reverse-biased. Reversing the polarity from VIN to VOUT
will turn on this diode (see Application Hints).
Note 6: Limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control
(SQC) methods. The limits are used to calculate National’s Average Outgoing Quality Level (AOQL).
Note 7: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below the value measured with a 1V differential.
Note 8: The ON/OFF inputs must be properly driven to prevent misoperation. For details, refer to Application Hints.
Note 9: See Typical Performance Characteristics curves.
Basic Application Circuit
DS012078-2
*ON/OFF input must be actively terminated. Tie to VIN if this function is not to be used.
**Minimum Output Capacitance is 1 µF to insure stability over full load current range. More capacitance provides superior dynamic performance and additional
stability margin (see Application Hints).
***Do not make connections to this pin.
5 www.national.com
5 Page 
Typical Performance Characteristics Unless otherwise specified: TA = 25˚C, VIN = VO(NOM) + 1V,
COUT = 2.2 µF, all voltage options, ON/OFF pin tied to VIN. (Continued)
ON/OFF Pin Current vs VON/OFF
DS012078-45
11 www.national.com
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet LP2980.PDF ] | |
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