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PDF LP3997MM-3.3 Data sheet ( Hoja de datos )
| Número de pieza | LP3997MM-3.3 | |
| Descripción | Micropower 250mA CMOS LDO Regulator with Error Flag / Power-On-Reset | |
| Fabricantes | National Semiconductor | |
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PRELIMINARY
May 2004
LP3997
Micropower 250mA CMOS LDO Regulator with Error
Flag / Power-On-Reset
General Description
The LP3997 regulator is designed to meet the requirements
of portable, battery-powered systems, providing accurate
output voltage, low noise, and low quiescent current. The
LP3997 provides 3.3V output at up to 250mA load current.
When switched in shutdown mode, the power consumption
is virtually zero.
The LP3997 is designed to be stable with space saving
ceramic capacitors as small as 1µF.
The LP3997 also includes an out-of-regulation error flag.
When the output is more than 5% below its nominal voltage,
the error flag sets to low. If a capacitor is connected to
device’s delay pin, a delayed power-on reset signal will be
generated.
Features
n Low, 140mV, Dropout at 250mA Load.
n Stable with Ceramic Capactor.
n Low Noise, with Bypass Capacitor.
n Less than 70µA Typical IQ at 250mA.
n Virtually Zero IQ (Disabled).
n Themal and Short Circuit Protection.
n 3.3V Output.
n For other voltage options, please contact your local NSC
sales office.
Package
8 Lead MSOP
For other package options contact your NSC sales office.
Applications
n Portable Consumer Electronics
n Cellular Handsets
n Laptop and Palm Computers
n PDA’s
n Digital Cameras
Typical Application Circuit
© 2004 National Semiconductor Corporation DS200929
20092901
www.national.com
1 page  
Electrical Characteristics (Continued)
Unless otherwise noted, VSD =950mV, VIN = VOUT + 1.0V, CIN = 2.2 µF, IOUT = 1 mA, COUT =2.2 µF and CNOISE = 0.1 µF.
Typical values and limits appearing in normal type apply for TJ = 27˚C. Limits appearing in boldface type apply over the full
temperature range for operation, −40 to +125˚C. (Note 11)
Symbol
Parameter
Conditions
Limit
Typ Units
Min Max
VHYST
Hysteresis
VOL ErrorOutput low Voltage
IOFF Error Output High Leakage
IDELAY
Delay Pin Current Source
Timing Characteristics
VIN Rising or Falling
ISINK = 2mA
ERROR = VOUT(NOM)
>VOUT 95% VOUT(NOM)
2 %VOUT
0.4 V
2 µA
2.2 µA
tON
Transient
Response
Turn On Time (Note 8)
To 95% Level
w/o CNOISE
CNOISE = 0.1µF
Line Transient Response |δVOUT| Trise = Tfall = 30µs (Note 8)
δVIN = 600mV
Load Transient Response
|δVOUT|
Trise = Tfall = 1µs (Note 8)
IOUT = 1mA to 150mA
150
2
8
70
250
TBA
80
µs
ms
mV
(pk - pk)
mV
Note 1: Absolute Maximum Ratings are limits beyond which damage can occur. Operating Ratings are conditions under which operation of the device is
guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical
Characteristics tables.
Note 2: All Voltages are with respect to the potential at the GND pin.
Note 3: Internal thermal shutdown circuitry protects the device from permanent damage.
Note 4: The human body model is 100pF discharged through a 1.5kΩ resistor into each pin. The machine model is a 200pF capacitor discharged directly into each
pin.
Note 5: The maximum ambient temperature (TA(max)) is dependant on the maximum operating junction temperature (TJ(max-op) = 125˚C), the maximum power
dissipation of the device in te application (PD(max)), and the junction to ambient thermal resistance of the part/package in the application (θJA), as given by the
following equation: TA(max) = TJ(max-op) - (θJA x PD(max)).
Note 6: Junction to ambient thermal resistance is dependant on the application and board layout. In applications where high maximum power dissipation is possible,
special care must be paid to thermal dissipation issues in board design.
Note 7: The device maintains the regulated output voltage without the load.
Note 8: This electrical specification is guaranteed by design.
Note 9: Short circuit current is measured on the input supply line at the point when the short circuit condition reduces the output voltage to 5% of its nominal value.
Note 10: Enable Pin has 6MΩ typical, resistor connected to GND.
Note 11: All limits are guaranteed. All electrical characteristics having room-temperature limits are tested during production at TJ = 25˚C or correlated using
Statistical Quality Control methods. Operation over the temperature specification is guaranteed by correlating the electrical characteristics to process and
temperature variations and applying statistical process control.
Output Capacitor, Recommended Specifications
Symbol
Parameter
Co Output Capacitor
Conditions
Capacitance(Note 12)
ESR
Typ
1.0
Limit
Min Max
0.7
5 500
Units
µF
mΩ
Note 12: The capacitor tolerance should be 30% or better over temperature. The full operating conditions for the application should be considered when selecting
a suitable capacitor to ensure that the minimum value of capacitance is always met. Recommended capacitor type is X7R. However, dependent on application, X5R,
Y5V, and Z5U can also be used. (See capacitor characteristics section in Application Hints)
5 www.national.com
5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
BANNED SUBSTANCE COMPLIANCE
National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products
Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification
(CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2.
National Semiconductor
Americas Customer
Support Center
Email: [email protected]
Tel: 1-800-272-9959
www.national.com
National Semiconductor
Europe Customer Support Center
Fax: +49 (0) 180-530 85 86
Email: [email protected]
Deutsch Tel: +49 (0) 69 9508 6208
English Tel: +44 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
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Asia Pacific Customer
Support Center
Email: [email protected]
National Semiconductor
Japan Customer Support Center
Fax: 81-3-5639-7507
Email: [email protected]
Tel: 81-3-5639-7560
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LP3997MM-3.3.PDF ] | |
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