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PDF LP3966ESX-3.3 Data sheet ( Hoja de datos )
| Número de pieza | LP3966ESX-3.3 | |
| Descripción | 3A Fast Ultra Low Dropout Linear Regulators | |
| Fabricantes | National Semiconductor | |
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April 2000
LP3963/LP3966
3A Fast Ultra Low Dropout Linear Regulators
General Description
The LP3963/LP3966 series of fast ultra low-dropout linear
regulators operate from a +2.5V to +7.0V input supply. Wide
range of preset output voltage options are available. These
ultra low dropout linear regulators respond very fast to step
changes in load which makes them suitable for low voltage
microprocessor applications. The LP3963/LP3966 are de-
veloped on a CMOS process which allows low quiescent
current operation independent of output load current.This
CMOS process also allows the LP3963/LP3966 to operate
under extremely low dropout conditions.
Dropout Voltage: Ultra low dropout voltage; typically 80mV
at 300mA load current and 800mV at 3A load current.
Ground Pin Current: Typically 6mA at 3A load current.
Shutdown Mode: Typically 15µA quiescent current when
the shutdown pin is pulled low.
Error Flag: Error flag goes low when the output voltage
drops 10% below nominal value (for LP3963).
SENSE: Sense pin improves regulation at remote loads.
(For LP3966)
Precision Output Voltage: Multiple output voltage options
are available ranging from 1.2V to 5.0V and adjustable, with
a guaranteed accuracy of ±1.5% at room temperature, and
±3.0% over all conditions ( varying line, load, and tempera-
ture).
Features
n Ultra low dropout voltage
n Low ground pin current
n Load regulation of 0.06%
n 15µA quiescent current in shutdown mode
n Guaranteed output current of 3A DC
n Available in TO-263 and TO-220 packages
n Output voltage accuracy ± 1.5%
n Error flag indicates output status (LP3963)
n Sense option improves better load regulation (LP3966)
n Extremely low output capacitor requirements
n Overtemperature/overcurrent protection
n −40˚C to +125˚C junction temperature range
Applications
n Microprocessor power supplies
n GTL, GTL+, BTL, and SSTL bus terminators
n Power supplies for DSPs
n SCSI terminator
n Post regulators
n High efficiency linear regulators
n Battery chargers
n Other battery powered applications
Typical Application Circuits
DS101267-1
# Minimum output capacitance is 10 µF to ensure stability over full load current range. More capacitance provides superior dynamic performance and additional
stability margin.
*SD and ERROR pins must be pulled high through a 10kΩ pull-up resistor. Connect the ERROR pin to ground if this function is not used. See applications sec-
tion for more information.
© 2000 National Semiconductor Corporation DS101267
www.national.com
1 page  
Ordering Information (Continued)
TABLE 1. Package Marking and Ordering Information
Output
Voltage
5.0
5.0
3.3
3.3
2.5
2.5
1.8
1.8
5.0
5.0
3.3
3.3
2.5
2.5
1.8
1.8
ADJ
ADJ
5.0
3.3
2.5
1.8
5.0
3.3
2.5
1.8
ADJ
Order Number
LP3963ES-5.0
LP3963ESX-5.0
LP3963ES-3.3
LP3963ESX-3.3
LP3963ES-2.5
LP3963ESX-2.5
LP3963ES-1.8
LP3963ESX-1.8
LP3966ES-5.0
LP3966ESX-5.0
LP3966ES-3.3
LP3966ESX-3.3
LP3966ES-2.5
LP3966ESX-2.5
LP3966ES-1.8
LP3966ESX-1.8
LP3966ES-ADJ
LP3966ESX-ADJ
LP3963ET-5.0
LP3963ET-3.3
LP3963ET-2.5
LP3963ET-1.8
LP3966ET-5.0
LP3966ET-3.3
LP3966ET-2.5
LP3966ET-1.8
LP3966ET-ADJ
Description
(Current, Option)
3A, Error Flag
3A, Error Flag
3A, Error Flag
3A, Error Flag
3A, Error Flag
3A, Error Flag
3A, Error Flag
3A, Error Flag
3A, SENSE
3A, SENSE
3A, SENSE
3A, SENSE
3A, SENSE
3A, SENSE
3A, SENSE
3A, SENSE
3A, ADJ
3A, ADJ
3A, Error Flag
3A, Error Flag
3A, Error Flag
3A, Error Flag
3A, SENSE
3A, SENSE
3A, SENSE
3A, SENSE
3A, ADJ
Package
Type
TO263-5
TO263-5
TO263-5
TO263-5
TO263-5
TO263-5
TO263-5
TO263-5
TO263-5
TO263-5
TO263-5
TO263-5
TO263-5
TO263-5
TO263-5
TO263-5
TO263-5
TO263-5
TO220-5
TO220-5
TO220-5
TO220-5
TO220-5
TO220-5
TO220-5
TO220-5
TO220-5
Package Marking
LP3963ES-5.0
LP3963ESX-5.0
LP3963ES-3.3
LP3963ES-3.3
LP3963ES-2.5
LP3963ES-2.5
LP3963ES-1.8
LP3963ES-1.8
LP3966ES-5.0
LP3966ESX-5.0
LP3966ES-3.3
LP3966ES-3.3
LP3966ES-2.5
LP3966ES-2.5
LP3966ES-1.8
LP3966ES-1.8
LP3966ES-ADJ
LP3966ES-ADJ
LP3963ET-5.0
LP3963ET-3.3
LP3963ET-2.5
LP3963ET-1.8
LP3966ET-5.0
LP3966ET-3.3
LP3966ET-2.5
LP3966ET-1.8
LP3966ET-ADJ
Supplied As:
Rail
Tape and Reel
Rail
Tape and Reel
Rail
Tape and Reel
Rail
Tape and Reel
Rail
Tape and Reel
Rail
Tape and Reel
Rail
Tape and Reel
Rail
Tape and Reel
Rail
Tape and Reel
Rail
Rail
Rail
Rail
Rail
Rail
Rail
Rail
Rail
5 www.national.com
5 Page 
Applications Information (Continued)
FIGURE 1. Error Flag Operation
DS101267-7
Sense Pin
In applications where the regulator output is not very close to
the load, LP3966 can provide better remote load regulation
using the SENSE pin. Figure 2 depicts the advantage of the
SENSE option. LP3963 regulates the voltage at the output
pin. Hence, the voltage at the remote load will be the regula-
tor output voltage minus the drop across the trace resis-
tance. For example, in the case of a 3.3V output, if the trace
resistance is 100mΩ, the voltage at the remote load will be
3V with 3A of load current, ILOAD. The LP3966 regulates the
voltage at the sense pin. Connecting the sense pin to the re-
mote load will provide regulation at the remote load, as
shown in Figure 2. If the sense option pin is not required, the
sense pin must be connected to the VOUT pin.
FIGURE 2. Improving remote load regulation using LP3966
DS101267-8
11 www.national.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LP3966ESX-3.3.PDF ] | |
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