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PDF LP3988IMFX-2.5 Data sheet ( Hoja de datos )
| Número de pieza | LP3988IMFX-2.5 | |
| Descripción | Micropower/ 150mA Ultra Low-Dropout CMOS Voltage Regulator With Power Good | |
| Fabricantes | National Semiconductor | |
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August 2004
LP3988
Micropower, 150mA Ultra Low-Dropout CMOS Voltage
Regulator With Power Good
General Description
The LP3988 is a 150mA low dropout regulator designed
specially to meet requirements of Portable battery-
applications. The LP3988 is designed to work with a space
saving, small 1µF ceramic capacitor. The LP3988 features
an Error Flag output that indicates a faulty output condition.
The LP3988’s performance is optimized for battery powered
systems to deliver low noise, extremely low dropout voltage
and low quiescent current. Regulator ground current in-
creases only slightly in dropout, further prolonging the bat-
tery life.
Power supply rejection is better than 60 dB at low frequen-
cies and starts to roll off at 10 kHz. High power supply
rejection is maintained down to lower input voltage levels
common to battery operated circuits.
The device is ideal for mobile phone and similar battery
powered wireless applications. It provides up to 150 mA,
from a 2.5V to 6V input, consuming less than 1 µA in disable
mode and has fast turn-on time less than 200µs.
The LP3988 is available 5 pin SOT-23 package and 5 bump
thin micro SMD package. Performance is specified for −40˚C
to +125˚C temperature range and is available in 1.85, 2.5,
2.6, 2.85, 3.0 and 3.3V output voltages.
n 40dB PSRR at 10kHz
n ≤1 µA quiescent current when shut down
n Fast Turn-On time: 100 µs (typ.)
n 80 mV typ dropout with 150mA load
n −40 to +125˚C junction temperature range for operation
n 1.85V, 2.5V, 2.6V, 2.85V, 3.0V, and 3.3V
Features
n 5 bump thin micro SMD package
n SOT-23-5 package
n Power-good flag output
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 2.85V, 150mA converter
Key Specifications
n 2.5 to 6.0V input range
n 150mA guaranteed output
Typical Application Circuit
20020502
© 2004 National Semiconductor Corporation DS200205
www.national.com
1 page  
Electrical Characteristics (Continued)
Unless otherwise specified: VEN = 1.8V, VIN = VOUT + 0.5V, CIN = 1 µF, IOUT = 1mA, COUT = 1 µF. Typical values and limits
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. (Note 6) (Note 7)
Symbol
Parameter
Conditions
Limit
Typ Units
Min Max
VIL Logic Low Input threshold
VIH Logic High Input threshold
Power Good
VIN = 2.5V to 6.0V
VIN = 2.5V to 6.0V
0.5
1.2
V
V
VTHL
VTHH
VOL
IPGL
TON
Power Good
Low threshold
High Threshold
% of VOUT (PG ON) Figure 2
% of VOUT (PG OFF) Figure 2 (Note
93
90
95
14) 95 92 98
%
PG Output Logic Low Voltage
PG Output Leakage Current
Power Good Turn On time,
(Note 9)
IPULL-UP = 100µA, fault condition
PG Off, VPG = 6V
VIN = 4.2V
0.02
0.02
10
0.1 V
µA
µs
TOFF
Power Good Turn Off time,
(Note 9)
VIN = 4.2V
10 µs
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 Absolute Maximum power dissipation depends on the ambient temperature and can be calculated using the formula:
PD = (TJ - TA)/θJA
where TJ is the junction temperature, TA is the ambient temperature, and θ JA is the junction-to-ambient thermal resistance. The 364mW rating appearing under
Absolute Maximum Ratings for the SOT23-5 package results from substituting the Absolute Maximum junction temperature, 150˚C, for TJ, 70˚C for TA, and 220˚C/W
for θJA. More power can be dissipated safely at ambient temperatures below 70˚C . Less power can be dissipated safely at ambient temperatures above 70˚C. The
Absolute Maximum power dissipation can be increased by 4.5mW for each degree below 70˚C, and it must be derated by 4.5mW for each degree above 70˚C. Same
principle applies to the micro SMD package.
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: Like the Absolute Maximum power dissipation, the maximum power dissipation for operation depends on the ambient temperature. The 250mW rating
appearing under Operating Ratings for the SOT23-5 package results from substituting the maximum junction temperature for operation, 125˚C, for TJ, 70˚C for TA,
and 220˚C/W for θJA into (Note 3) above. More power can be dissipated at ambient temperatures below 70˚C . Less power can be dissipated at ambient
temperatures above 70˚C. The maximum power dissipation for operation can be increased by 4.5mW for each degree below 70˚C, and it must be derated by 4.5mW
for each degree above 70˚C. Same principle applies to the micro SMD package.
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.
Note 10: Short circuit current is measured on input supply line after pulling down VOUT to 95% VOUT(nom).
Note 11: Guaranteed by design. The capacitor tolerance should be ±30% or better over the full temperature range. The full range of operating conditions such as
temperature, DC bias and even capacitor case size for the capacitor in the application should be considered during device selection to ensure this minimum
capacitance specification is met. X7R capacitor types are recommended to meet the full device temperature range.
Note 12: 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 13: 100V machine model for Power-good flag, pin 4.
Note 14: The low and high thresholds are generated together. Typically a 2.6% difference is seen between these thresholds.
Note 15: The minimum VIN is dependant on the device output option.
For Vout(NOM) < 2.5V, VIN(MIN) will equal 2.5V. For Vout(NOM) >= 2.5V, VIN(MIN) will equal Vout(NOM) + 200mV.
5 www.national.com
5 Page 
Notes
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]
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English Tel: +44 (0) 870 24 0 2171
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Support Center
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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 LP3988IMFX-2.5.PDF ] | |
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