lp38512tsx-1.8 National Semiconductor Corporation, lp38512tsx-1.8 Datasheet

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lp38512tsx-1.8

Manufacturer Part Number
lp38512tsx-1.8
Description
1.5a Fast-transient Response Low-dropout Linear Voltage Regulator With Error Flag
Manufacturer
National Semiconductor Corporation
Datasheet
© 2007 National Semiconductor Corporation
LP38512-1.8
1.5A Fast-Transient Response Low-Dropout Linear
Voltage Regulator with Error Flag
General Description
The LP38512-1.8 Fast-Transient Response Low-Dropout
Voltage Regulator offers the highest-performance in meeting
AC and DC accuracy requirements for powering Digital
Cores. The LP38512-1.8 uses a proprietary control loop that
enables extremely fast response to change in line conditions
and load demands. Output Voltage DC accuracy is guaran-
teed at 2.5% over line, load and full temperature range from
-40°C to +125°C. The LP38512-1.8 is designed for inputs
from the 2.5V, 3.3V, and 5.0V rail, is stable with 10 μF ceramic
capacitors, and has a fixed 1.8V output. An Error Flag feature
monitors the output voltage and notifies the system processor
when the output voltage falls more than 15% below the nom-
inal value. The LP38512-1.8 provides excellent transient per-
formance to meet the demand of high performance digital
core ASICs, DSPs, and FPGAs found in highly-intensive ap-
plications such as servers, routers/switches, and base sta-
tions.
Typical Application Circuit
201830
Features
Applications
2.25V to 5.5V Input Voltage Range
1.8V Fixed Output Voltage
1.5A Output Load Current
±2.5% Accuracy over Line, Load, and Full-Temperature
Range from -40°C to +125°C
Stable with tiny 10 µF ceramic capacitors
0.20% Output Voltage Load Regulation from 10 mA to
1.5A
Enable pin
Error Flag Indicates Status of Output Voltage
1uA of Quiescent current in Shutdown
40dB of PSRR at 100 kHz
Over-Temperature and Over-Current Protection
TO263-5 Package
Digital Core ASICs, FPGAs, and DSPs
Servers
Routers and Switches
Base Stations
Storage Area Networks
DDR2 Memory
November 27, 2007
20183001
www.national.com

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lp38512tsx-1.8 Summary of contents

Page 1

... The LP38512-1.8 provides excellent transient per- formance to meet the demand of high performance digital core ASICs, DSPs, and FPGAs found in highly-intensive ap- plications such as servers, routers/switches, and base sta- tions. Typical Application Circuit © 2007 National Semiconductor Corporation Features ■ 2.25V to 5.5V Input Voltage Range ■ 1.8V Fixed Output Voltage ■ ...

Page 2

... Ordering Information Output Order Number Voltage LP38512TS-1.8 1.8 LP38512TSX-1.8 Connection Diagram Pin Descriptions for TO-263 Package Pin # TO263 GND 4 OUT 5 ERROR TAB TAB www.national.com TABLE 1. Package Marking and Ordering Information Package Type TO263-5 TO263-5 Top View TO-263 5 Pin Package Function Enable ...

Page 3

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 Soldering Temperature (Note 3) TO-220, Wave TO-263 ESD Rating (Note 2) Power Dissipation(Note 4) Input Pin ...

Page 4

Symbol Parameter ERROR Flag Error Flag Threshold V TH (Note 9) ERROR Flag Saturation V ERROR(SAT) Voltage ERROR Flag Pin Leakage I lk Current t ERROR Flag Delay time d AC Parameters PSRR Ripple Rejection Output Noise Density e n ...

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Typical Performance Characteristics µ µ mA. IN OUT OUT V vs Temperature OUT Ground Pin Current (I GND Ground Pin Current Temperature, V GND Unless otherwise specified: T 20183011 ...

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OUT EN V ERROR Flag Threshold vs Temperature OUT Load regulation vs Temperature www.national.com (t ) d(ON) 20183032 20183017 20183020 OUT EN d(OFF) 20183030 ERROR Flag Low vs Temperature 20183018 Line ...

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Current Limit vs Temperature Load Transient 1. µF Ceramic + 100 µF Aluminum OUT Load Transient, 500 μF Ceramic + 100 µF Aluminum C OUT Load Transient ...

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PSRR, 10Hz to 1MHz www.national.com 20183029 8 Noise 20183031 ...

Page 9

Block Diagram Application Information 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 A ceramic input capacitor of at least 10 µF is required. ...

Page 10

Please refer to the POW- ER DISSIPATION/HEATSINKING section for power dissipa- tion calculations. ENABLE OPERATION The Enable ON threshold is typically 1.2V, and the OFF threshold is typically 1.0V. To ensure reliable operation the ...

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FIGURE 2. ERROR Flag Operation, biased from V POWER DISSIPATION/HEATSINKING A heatsink may be required depending on the maximum pow- er dissipation (P ), maximum ambient temperature D(MAX the application, and the thermal resistance (θ A(MAX) of ...

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Physical Dimensions www.national.com inches (millimeters) unless otherwise noted TO-263 5-Lead, Molded, Surface Mount Package NS Package Number TS5B 12 ...

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Notes 13 www.national.com ...

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... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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