LP3966ES-ADJ/NOPB National Semiconductor, LP3966ES-ADJ/NOPB Datasheet

IC REGULATOR ULTR LDO TO-263-5

LP3966ES-ADJ/NOPB

Manufacturer Part Number
LP3966ES-ADJ/NOPB
Description
IC REGULATOR ULTR LDO TO-263-5
Manufacturer
National Semiconductor
Datasheet

Specifications of LP3966ES-ADJ/NOPB

Regulator Topology
Positive Adjustable
Voltage - Output
1.2 ~ 5 V
Voltage - Input
2.5 ~ 7 V
Voltage - Dropout (typical)
0.8V @ 3A
Number Of Regulators
1
Current - Output
3A (Max)
Current - Limit (min)
4A
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
TO-263-5, D²Pak (5 leads + Tab), TO-263BA
Number Of Outputs
1
Polarity
Positive
Input Voltage Max
7 V
Output Voltage
1.2 V to 5 V
Output Type
Adjustable
Dropout Voltage (max)
0.1 V at 300 mA
Output Current
3 A
Line Regulation
0.02 %
Load Regulation
0.06 %
Voltage Regulation Accuracy
+/- 1.5 %
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
*LP3966ES-ADJ
*LP3966ES-ADJ/NOPB
LP3966ES-ADJ
© 2006 National Semiconductor Corporation
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 quickly to
step changes in load which makes them suitable for low
voltage microprocessor applications. The LP3963/LP3966
are developed on a CMOS process which allows low quies-
cent current operation independent of output load current.
This CMOS process also allows the LP3963/LP3966 to op-
erate 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
(LP3966), with a guaranteed accuracy of
temperature, and
load, and temperature).
Typical Application Circuits
*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
section for more information.
** See Application Hints
±
3.0% over all conditions (varying line,
DS101267
±
1.5% at room
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
n Error flag indicates output status (LP3963)
n Sense option improves load regulation (LP3966)
n Minimum 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
±
1.5%
September 2006
www.national.com
10126701

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LP3966ES-ADJ/NOPB Summary of contents

Page 1

... 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 section for more information. ** See Application Hints © 2006 National Semiconductor Corporation Features n Ultra low dropout voltage n Low ground pin current n Load regulation of 0.06% n 15µ ...

Page 2

Typical Application Circuits *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 section for more information. ** See Application Hints Block Diagram ...

Page 3

Block Diagram LP3966 Block Diagram LP3966-ADJ Connection Diagrams Top View TO220-5 Package Bent, Staggered Leads 10126735 10126705 TO263-5 Package 3 10126729 10126706 Top View www.national.com ...

Page 4

... Tape and Reel LP3963ES-1.8 Rail LP3963ES-1.8 Tape and Reel LP3966ES-5.0 Rail LP3966ESX-5.0 Tape and Reel LP3966ES-3.3 Rail LP3966ES-3.3 Tape and Reel LP3966ES-2.5 Rail LP3966ES-2.5 Tape and Reel LP3966ES-1.8 Rail LP3966ES-1.8 Tape and Reel LP3966ES-ADJ Rail LP3966ES-ADJ Tape and Reel LP3963ET-5.0 Rail LP3963ET-3 ...

Page 5

Ordering Information (Continued) TABLE 1. Package Marking and Ordering Information (Continued) Output Voltage Order Number 5.0 LP3966ET-5.0 3.3 LP3966ET-3.3 2.5 LP3966ET-2.5 1.8 LP3966ET-1.8 ADJ LP3966ET-ADJ Description Package (Current, Option) Type 3A, SENSE TO220-5 3A, SENSE TO220-5 3A, SENSE TO220-5 3A, ...

Page 6

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Storage Temperature Range Lead Temperature (Soldering, 5 sec.) ESD Rating (Note 3) Power Dissipation (Note 2) Input Supply Voltage (Survival) Shutdown Input Voltage (Survival) ...

Page 7

Electrical Characteristics LP3963/LP3966 (Continued) Limits in standard typeface are for T J Unless otherwise specified O(NOM) Symbol Parameter SHUTDOWN INPUT V Shutdown Threshold SDT T Turn-off delay dOFF T Turn-on delay dON I SD Input Current ...

Page 8

Typical Performance Characteristics 2.5V 33µ 10mA, C OUT OUT Drop-Out Voltage Vs Temperature for Different Load Currents Ground Pin Current Vs Input Voltage (V Ground Current Vs Temperature (V www.national.com Unless otherwise specified 68µF, ...

Page 9

Typical Performance Characteristics C = 33µ 10mA 68µF, V OUT OUT IN Ground Pin Current Vs Shutdown Pin Voltage Output Noise Density, V OUT Load Transient Response Unless otherwise specified and T ...

Page 10

Typical Performance Characteristics C = 33µ 10mA 68µF, V OUT OUT IN δV vs Temperature OUT Line Transient Response Line Transient Response (I www.national.com Unless otherwise specified and T = 25˚C. (Continued) ...

Page 11

Application Hints EXTERNAL CAPACITORS Like any low-dropout regulator, external capacitors are re- quired to assure stability. these capacitors must be correctly selected for proper performance. INPUT CAPACITOR: The LP3963/6 requires a low source impedance to maintain regulator stability because the ...

Page 12

Application Hints (Continued) the LP396X. Derating must be applied to the manufacturer’s ESR specification, since it is typically only valid at room temperature. Any applications using aluminum electrolytics should be thoroughly tested at the lowest ambient operating tempera- ture where ...

Page 13

Application Hints (Continued) Once the power pass element shuts down, the control loop will rapidly cycle the output on and off until the average power dissipation causes the thermal shutdown circuit to respond to servo the on/off cycling to a ...

Page 14

Application Hints (Continued) FIGURE 2. Improving remote load regulation using LP3966 SHUTDOWN OPERATION A CMOS Logic level signal at the shutdown ( SD) pin will turn-off the regulator. Pin SD must be actively terminated through a 10kΩ pull-up resistor for ...

Page 15

Application Hints (Continued) HEATSINKING TO-263 PACKAGE The TO-263 package uses the copper plane on the PCB as a heatsink. The tab of these packages are soldered to the copper plane for heat sinking. Figure 3 shows a curve for the ...

Page 16

Physical Dimensions TO220 5-lead, Molded, Stagger Bend Package (TO220-5) For Order Numbers, refer to the “Ordering Information” section of this document. TO263 5-Lead, Molded, Surface Mount Package (TO263-5) For Order Numbers, refer to the “Ordering Information” section of this document. ...

Page 17

... BANNED SUBSTANCE COMPLIANCE National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C2) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/quality/green. ...

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