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PDF LP2992AIM5X-1.5 Data sheet ( Hoja de datos )
| Número de pieza | LP2992AIM5X-1.5 | |
| Descripción | Micropower 250 mA Low-Noise Ultra Low-Dropout Regulator in SOT-23 and LLP Packages Designed for Use with Very Low ESR Output Capacitors | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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June 2002
LP2992
Micropower 250 mA Low-Noise Ultra Low-Dropout
Regulator in SOT-23 and LLP Packages
Designed for Use with Very Low ESR Output Capacitors
General Description
The LP2992 is a 250 mA, fixed-output voltage regulator
designed to provide ultra low-dropout and low noise in bat-
tery powered applications.
Using an optimized VIP™ (Vertically Integrated PNP) pro-
cess, the LP2992 delivers unequalled performance in all
specifications critical to battery-powered designs:
Dropout Voltage: Typically 450 mV @ 250 mA load, and
5 mV @ 1 mA load.
Ground Pin Current: Typically 1500 µA @ 250 mA load, and
75 µA @ 1 mA load.
Enhanced Stability: The LP2992 is stable with output ca-
pacitor ESR as low as 5 mΩ, which allows the use of ceramic
capacitors on the output.
Sleep Mode: Less than 1 µA quiescent current when
ON/OFF pin is pulled low.
Smallest Possible Size: SOT-23 and LLP packages use
absolute minimum board space.
Precision Output: 1% tolerance output voltages available
(A grade).
Low Noise: By adding a 10 nF bypass capacitor, output
noise can be reduced to 30 µV (typical).
Multiple voltage options, from 1.5V to 5.0V, are available as
standard products. Consult factory for custom voltages.
Features
n Ultra low dropout voltage
n Guaranteed 250 mA output current
n Smallest possible size (SOT-23, LLP package)
n Requires minimum external components
n Stable with low-ESR output capacitor
n <1 µA quiescent current when shut down
n Low ground pin current at all loads
n Output voltage accuracy 1% (A Grade)
n High peak current capability
n Wide supply voltage range (16V max)
n Low ZOUT: 0.3Ω typical (10 Hz to 1 MHz)
n Overtemperature/overcurrent protection
n −40˚C to +125˚C junction temperature range
n Custom voltages available
Applications
n Cellular Phone
n Palmtop/Laptop Computer
n Personal Digital Assistant (PDA)
n Camcorder, Personal Stereo, Camera
Block Diagram
VIP™ is a trademark of National Semiconductor Corporation.
© 2002 National Semiconductor Corporation DS200294
20029401
www.national.com
1 page  
Electrical Characteristics (Continued)
Limits in standard typeface are for TJ = 25˚C. and limits in boldface type apply over the full operating temperature range. Un-
less otherwise specified: VIN = VO(NOM) + 1V, IL = 1 mA, CIN = 1 µF, COUT = 4.7 µF, VON/OFF = 2V.
LP2992AI-X.X
LP2992I-X.X
Symbol
Parameter
Conditions
Typ (Note 6)
(Note 6)
Units
Min Max Min Max
ION/OFF
en
ON/OFF Input Current
Output Noise
Voltage (RMS)
Ripple Rejection
VON/OFF = 0
VON/OFF = 5V
BW = 300 Hz to 50 kHz,
COUT = 10 µF
CBYPASS = 10 nF
f = 1 kHz, CBYPASS = 10 nF
COUT = 10 µF
0.01
5
30
45
−2
15
−2
µA
15
µV
dB
IO(SC)
Short Circuit Current
RL = 0 (Steady State)
(Note 9)
400
mA
IO(PK)
Peak Output Current VOUT ≥ Vo(NOM) −5%
350
mA
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the
device outside of its rated operating conditions.
Note 2: The ESD rating of pins 3 and 4 for the SOT-23 package, or pins 1 and 3 for the LLP package, is 1 kV.
Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, θJ-A,
and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperture is calculated using:
Where the value of θJ-A for the SOT-23 package is 220˚C/W in a typical PC board mounting and the LLP package is 65˚C/W. Exceeding the maximum allowable
dissipation will cause excessive 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 LP2992 output must be diode-clamped to ground.
Note 5: The output PNP structure contains a diode between the VIN to VOUT terminals that is normally reverse-biased. Reversing the polarity from VIN to VOUT will
turn on this diode.
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: VIN must be the greater of 2.2V or VOUT(nom) + Dropout Voltage to maintain output regulation. Dropout voltage is defined as the input to output differential
at which the output voltage drops 2% below the value measured with a 1V differential.
Note 8: The ON/OFF input must be properly driven to prevent possible misoperation. For details, refer to Application Hints.
Note 9: The LP2992 has foldback current limiting which allows a high peak current when VOUT > 0.5V, and then reduces the maximum output current as VOUT is
forced to ground (see Typical Performance Characteristics curves).
5 www.national.com
5 Page 
Typical Performance Characteristics Unless otherwise specified: CIN = 1µF, COUT = 4.7µF, VIN =
VOUT(NOM) +1, TA = 25˚C, ON/OFF pin is tied to VIN. (Continued)
Turn-On Time
Turn-On Time
Turn-On Time
20029440
20029441
20029442
11 www.national.com
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet LP2992AIM5X-1.5.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LP2992AIM5X-1.5 | Micropower 250 mA Low-Noise Ultra Low-Dropout Regulator in SOT-23 and LLP Packages Designed for Use with Very Low ESR Output Capacitors | National Semiconductor |
| LP2992AIM5X-1.5 | Micropower 250 mA Low-Noise Ultra Low-Dropout Regulator in SOT-23 and LLP Packages Designed for Use with Very Low ESR Output Capacitors | National Semiconductor |
| LP2992AIM5X-1.8 | Micropower 250 mA Low-Noise Ultra Low-Dropout Regulator in SOT-23 and LLP Packages Designed for Use with Very Low ESR Output Capacitors | National Semiconductor |
| LP2992AIM5X-1.8 | Micropower 250 mA Low-Noise Ultra Low-Dropout Regulator in SOT-23 and LLP Packages Designed for Use with Very Low ESR Output Capacitors | National Semiconductor |
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