LP38511TS-1.8EV National Semiconductor, LP38511TS-1.8EV Datasheet

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LP38511TS-1.8EV

Manufacturer Part Number
LP38511TS-1.8EV
Description
BOARD EVAL FOR LP38511TS-1.8
Manufacturer
National Semiconductor
Datasheets

Specifications of LP38511TS-1.8EV

Channels Per Ic
1 - Single
Voltage - Output
1.8V
Current - Output
800mA
Voltage - Input
2.25 ~ 5.5V
Regulator Type
Positive Fixed
Operating Temperature
-40°C ~ 125°C
Board Type
Fully Populated
Utilized Ic / Part
LP38511
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
© 2009 National Semiconductor Corporation
800 mA Fast-Transient Response Low-Dropout Linear
Voltage Regulator with Error Flag
General Description
The LP38511-1.8 Fast-Transient Response Low-Dropout
Voltage Regulator offers the highest-performance in meeting
AC and DC accuracy requirements for powering Digital
Cores. The LP38511-1.8 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 LP38511-1.8 is designed for inputs
from the 2.5V, 3.3V, and 5.0V rail, is stable with 10uF 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 LP38511-1.8 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
201829
LP38511-1.8
Features
Applications
2.25V to 5.5V Input Voltage Range
1.8V Fixed Output Voltage
800 mA Output Load Current
+/- 2.5% V
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 800
mA
Enable pin
Error Flag Indicates Status of Output Voltage
1 µA of Quiescent current in Shutdown
40dB of PSRR at 100 kHz
Over-Temperature and Over-Current Protection
TO263 and TO-263 THIN Surface Mount Packages
Digital Core ASICs, FPGAs, and DSPs
Servers
Routers and Switches
Base Stations
Storage Area Networks
DDR2 Memory
OUT
Accuracy over Line, Load, and Full-
20182901
March 6, 2009
www.national.com

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LP38511TS-1.8EV Summary of contents

Page 1

... The LP38511-1.8 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 © 2009 National Semiconductor Corporation LP38511-1.8 Features ■ 2.25V to 5.5V Input Voltage Range ■ ...

Page 2

... The TAB/DAP is internally connected to device pin 3, and is electrical ground connection. 2 Package Marking Supplied As: LP38511TJ-1.8 Tape and Reel LP38511TS-1.8 Rail LP38511TS-1.8 Tape and Reel 20182905 Top View TO-263 THIN 5 Pin Package is within 15% (V falling) of the nominal OUT OUT ...

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 Peak Reflow Temperature (Note 3) PSOP-8 TO-263 ESD Rating (Note 2) Power Dissipation(Note 4) Input Pin Voltage (Survival) Enable Pin Voltage (Survival) ...

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 ...

Page 5

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 20182911 ...

Page 6

OUT EN V ERROR Flag Threshold vs Temperature OUT Load regulation vs Temperature www.national.com (t ) d(ON) 20182932 20182917 20182920 OUT EN d(OFF) 20182930 ERROR Flag Low vs Temperature 20182918 Line ...

Page 7

Current Limit vs Temperature Load Transient 800 µF Ceramic + 100 µF Aluminum OUT Load Transient, 250 mA to 800 μF Ceramic + 100 μF Aluminum C OUT Load Transient, ...

Page 8

PSRR, 10Hz to 1MHz www.national.com 20182929 8 Noise 20182931 ...

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 ...

Page 11

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 D(MAX) temperature ( the application, and the thermal re- A(MAX) sistance (θ ) ...

Page 12

Physical Dimensions TO-263, Molded, 5 Lead, 0.067in (1.7mm) Pitch, Surface Mount Package TO-263 THIN, Molded, 5 Lead, 1.7mm Pitch, Surface Mount Package www.national.com inches (millimeters) unless otherwise noted NS Package Number TS5B NS Package Number TJ5A 12 ...

Page 13

Notes 13 www.national.com ...

Page 14

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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