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PDF LP3981ILD-3.3 Data sheet ( Hoja de datos )
| Número de pieza | LP3981ILD-3.3 | |
| Descripción | Micropower/ 300mA Ultra Low-Dropout CMOS Voltage | |
| Fabricantes | National Semiconductor | |
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March 2003
LP3981
Micropower, 300mA Ultra Low-Dropout CMOS Voltage
Regulator
General Description
The LP3981’s performance is optimized for battery powered
systems to deliver ultra low noise, extremely low dropout
voltage and low quiescent current. Regulator ground current
increases only slightly in dropout, further prolonging the
battery life.
Power supply rejection is better than 60 dB at low frequen-
cies. This high power supply rejection is maintained down to
lower input voltage levels common to battery operated cir-
cuits.
The device is ideal for mobile phone and similar battery
powered wireless applications. It provides up to 300 mA,
from a 2.5V to 6V input, consuming less than 1µA in disable
mode.
The LP3981 is available in MSOP-8 package. For LP3981 in
LLP-6 package, contact NSC sales offices. Performance is
specified for −40˚C to +125˚C temperature range. The de-
vice available in the following output voltages; 2.5V, 2.7V,
2.8V, 2.83V, 3.0V, 3.03V and 3.3V as standard. Other output
options can be made available, please contact your local
NSC sales office.
Key Specifications
n 2.5 to 6.0V input range
n 300mA guaranteed output
n 60dB PSRR at 1kHz
n ≤1µA quiescent current when shut down
n Fast Turn-On time: 120 µs (typ.) with CBYPASS = 0.01uF
n 132mV typ dropout with 300mA load
n 35µVrms output noise over 10Hz to 100kHz
n −40 to +125˚C junction temperature range for operation
n 2.5V, 2.7V, 2.8V, 2.83V, 3.0V, 3.03V, and 3.3V outputs
standard
Features
n Small, space saving MSOP-8
n Low Thermal Resistance in LLP-6 package gives
excellent power capability
n Logic controlled enable
n Stable with ceramic and high quality tantalum capacitors
n Fast turn-on
n Thermal shutdown and short-circuit current limit
Applications
n CDMA cellular handsets
n Wideband CDMA cellular handsets
n GSM cellular handsets
n Portable information appliances
n Tiny 3.3V ± 5% to 2.5V, 300mA converter
Typical Application Circuit
Note: Pin Numbers in parenthesis indicate LLP-6 package.
20020302
© 2003 National Semiconductor Corporation DS200203
www.national.com
1 page  
Electrical Characteristics (Continued)
Unless otherwise specified: VEN = 1.2V, VIN = VOUT + 0.5V, CIN = 2.2 µF, CBP = 0.033 µF, IOUT = 1mA, COUT = 2.2 µF. Typi-
cal values and imits appearing in standard typeface are for TJ = 25˚C. Limits appearing in boldface type apply over the entire
junction temperature range for operation, −40˚C to +125˚C. (Notes 6, 7)
Symbol
Parameter
Conditions
Limit
Typ Units
Min Max
TON Turn-On Time
(Note 10) (Note 11)
CBYPASS = 0.033 µF
µs
240 350
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may 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: The figures given for Absolute Maximum Power disipation for the device are calculated using the following equations:
where TJ(MAX) is the maximum junction temperature, TA is the ambient temperature, and θ JA is the junction-to-ambient thermal resistance.
E.g. for the LLP package θ JA=50˚C/W, TJ(MAX)=150˚C and using TA=25˚C the maximum power dissipation is found to be 2.5W. The derating factor (−1/θJA) =
−20mW/˚C, thus below 25˚C the power dissipation figure can be increased by 20W per degree, and similarity decreased by this factor for temperatures above 25˚C
Note 4: The human body model is 100pF discharged through 1.5kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged directly into each
pin.
Note 5: As for the Maximum Power dissipation, the maximum power in operation is dependant on the ambient temperature. This can be calculated in teh same way
using TJ=125˚C, giving 2W as the maximum power dissipation for the LLP package in operation. The same derating factor applies.
Note 6: All limits are guaranteed. All electrical characteristics having room-temperature limits are tested during production with TJ = 25˚C or correlated using
Statistical Quality Control (SQC) methods. All hot and cold limits are guaranteed by correlating the electrical characteristics to process and temperature variations
and applying statistical process control.
Note 7: The target output voltage, which is labeled VOUT(nom), is the desired voltage option.
Note 8: An increase in the load current results in a slight decrease in the output voltage and vice versa.
Note 9: Dropout voltage is the input-to-output voltage difference at which the output voltage is 100mV below its nominal value. This specification does not apply for
input voltages below 2.5V.
Note 10: Guaranteed by design.
Note 11: Turn-on time is time measured between the enable input just exceeding VIH and the output voltage just reaching 95% of its nominal value.
Note 12: For VOUT > 2.5C, Increase IQ(MAX) by 2.5µA for every 0.1V increase in VOUT(NOM).
i.e. IQ(MAX) = 210 + ((VOUT(NOM) - 2.5) * 25)µA
Output Capacitor, Recommended Specification
Symbol
COUT
Parameter
Output Capacitor
Conditions
Capacitance
ESR
Limit
Typ Units
Min Max
2.2 22
µF
5 500 mΩ
FIGURE 1. Line Transient Response Input Perturbation
20020308
5 www.national.com
5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
NS Package Number LDC06D
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.
National Semiconductor
Americas Customer
Support Center
Email: [email protected]
Tel: 1-800-272-9959
www.national.com
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Fax: +49 (0) 180-530 85 86
Email: [email protected]
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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 LP3981ILD-3.3.PDF ] | |
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