LP38502A-ADJ National Semiconductor, LP38502A-ADJ Datasheet

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LP38502A-ADJ

Manufacturer Part Number
LP38502A-ADJ
Description
(LP38500-ADJ / LP38502-ADJ) 1.5A FlexCap Low Dropout Linear Regulator
Manufacturer
National Semiconductor
Datasheet
1.LP38502A-ADJ.pdf (16 pages)
© 2008 National Semiconductor Corporation
LP38500/2-ADJ, LP38500A/2A-ADJ
1.5A FlexCap Low Dropout Linear Regulator for 2.7V to
5.5V Inputs
General Description
National's FlexCap LDO's feature unique compensation that
allows the use of any type of output capacitor with no limits
on minimum or maximum ESR. The LP38500/2 series of low-
dropout linear regulators operates from a +2.7V to +5.5V input
supply. These ultra low dropout linear regulators respond very
quickly to step changes in load, which makes them suitable
for low voltage microprocessor applications. Developed on a
CMOS process, (utilizing a PMOS pass transistor), the
LP38500/2 has low quiescent current that changes little with
load current.
Ground Pin Current: Typically 2 mA at 1.5A load current.
Disable Mode: Typically 25 nA quiescent current when the
Enable pin is pulled low.
Simplified Compensation: Stable with any type of output
capacitor, regardless of ESR.
Precision Output: "A" grade versions available with 1.5%
V
ture.
Typical Application Circuit
ADJ
tolerance (25°C) and 3% over line, load and tempera-
300361
Features
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Applications
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www.DataSheet.co.kr
FlexCap: Stable with ceramic, tantalum, or aluminum
capacitors
Stable with 10 µF input/output capacitor
Adjustable output voltage from 0.6V to 5V
Low ground pin current
25 nA quiescent current in shutdown mode
Guaranteed output current of 1.5A
Available in TO-263, TO-263 THIN, and LLP-8 packages
Guaranteed V
Guaranteed accuracy of ±3.5% @ 25°C (STD)
Over-Temperature and Over-Current protection
−40°C to +125°C operating T
Enable pin (LP38502)
ASIC Power Supplies In:
DSP and FPGA Power Supplies
SMPS Regulator
Conversion from 3.3V or 5V Rail
Printers, Graphics Cards, DVD Players
Set Top Boxes, Copiers, Routers
ADJ
accuracy of ±1.5% @ 25°C (A Grade)
30036119
J
range
www.national.com
May 19, 2008
Datasheet pdf - http://www.DataSheet4U.net/

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LP38502A-ADJ Summary of contents

Page 1

... Precision Output: "A" grade versions available with 1.5% V tolerance (25°C) and 3% over line, load and tempera- ADJ ture. Typical Application Circuit © 2008 National Semiconductor Corporation Features ■ FlexCap: Stable with ceramic, tantalum, or aluminum capacitors ■ Stable with 10 µF input/output capacitor ■ ...

Page 2

... DAP DAP www.national.com 30036121 30036163 Top View (LP38502TJ-ADJ, LP38502ATJ-ADJ) www.DataSheet.co.kr Function Enable (LP38502 only). Pull high to enable the output, low to disable the output. This pin has no internal bias and must be either tied to the input voltage, or actively driven. In the LP38500, this pin has no internal connections. It can be left floating or used for trace routing ...

Page 3

... LP38502SDX-ADJ LP38502SD-ADJ ADJ LP38500ASDX-ADJ LP38500ASD-ADJ LP38502ASDX-ADJ LP38502ASD-ADJ LP38500TSX-ADJ LP38500TS-ADJ ADJ LP38502TSX-ADJ LP38502TS-ADJ LP38500TJ-ADJ LP38502TJ-ADJ ADJ LP38500ATJ-ADJ LP38502ATJ-ADJ 30036159 Top View (LP38502SD-ADJ, LP38502ASD-ADJ) www.DataSheet.co.kr Package Type Package Marking LP38500SD-ADJ LP38500SD-ADJ LP38502SD-ADJ LP38502SD-ADJ LLP-8 LP38500ASD-ADJ LP38500ASD-ADJ LP38502ASD-ADJ LP38502ASD-ADJ LP38500TS-ADJ LP38500TS-ADJ TO-263 LP38502TS-ADJ LP38502TS-ADJ ...

Page 4

... 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 2) Power Dissipation(Note 3) Input Pin Voltage (Survival) Enable Pin Voltage (Survival) Output Pin Voltage (Survival) ...

Page 5

Symbol Parameter AC Parameters PSRR Ripple Rejection ρ Output Noise Density n(l/f) e Output Noise Voltage n Thermal Characteristics T Thermal Shutdown SD ΔT Thermal Shutdown Hysteresis T SD Thermal Resistance Junction to Ambient θ J-A Thermal Resistance Junction to ...

Page 6

Typical Performance Characteristics µ µ mA OUT OUT Noise Density I vs Load Current GND V vs Temperature ADJ www.national.com Unless otherwise specified 1.8V OUT 30036110 I ...

Page 7

V vs Temperature EN 30036116 Turn-on Time 30036155 Turn-on Characteristics Turn-on Time www.DataSheet.co.kr 7 30036117 30036156 www.national.com Datasheet pdf - http://www.DataSheet4U.net/ ...

Page 8

Block Diagrams (TO-263, TO-263 THIN) Block Diagrams (LLP-8) www.national.com LP38500-ADJ TO-263 Block Diagram LP38502-ADJ TO-263 Block Diagram LP38500-ADJ LLP-8 Block Diagram www.DataSheet.co.kr LP38502-ADJ LLP-8 Block Diagram 8 30036150 30036151 30036158 30036151 Datasheet pdf - http://www.DataSheet4U.net/ ...

Page 9

Application Information EXTERNAL CAPACITORS The LP3850X requires that at least 10 µF (±20%) capacitors be used at the input and output pins located within one cm of the IC. Larger capacitors may be used without limit on size for both ...

Page 10

FIGURE 3. Gain-Bandwidth Plot for No Load The reduction in unity-gain bandwidth as load current is re- duced is normal for any LDO regulator using a P-FET or PNP pass transistor, because they have a pole in the loop gain ...

Page 11

RFI/EMI SUSCEPTIBILITY RFI (Radio Frequency Interference) and EMI (Electro-Mag- netic Interference) can degrade any integrated circuit's per- formance because of the small dimensions of the geometries inside the device. In applications where circuit sources are present which generate signals with ...

Page 12

The LP38500/2-ADJ is available in the TO-263 and LLP-8 packages. The thermal resistance depends on the amount of copper area allocated to heat transfer. HEATSINKING TO-263 and TO-263 THIN PACKAGES The TO-263 package and TO-263 THIN package use the copper ...

Page 13

Physical Dimensions inches (millimeters) unless otherwise noted TO-263 5-Lead, Molded, Surface Mount Package TO-263 THIN 5-Lead, Molded, Surface Mount Package NS Package Number TS5B www.DataSheet.co.kr NS Package Number TJ5A 13 www.national.com Datasheet pdf - http://www.DataSheet4U.net/ ...

Page 14

LLP Package NS Package Number SDA08C www.DataSheet.co.kr 14 Datasheet pdf - http://www.DataSheet4U.net/ ...

Page 15

Notes www.DataSheet.co.kr 15 www.national.com Datasheet pdf - http://www.DataSheet4U.net/ ...

Page 16

... 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 Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www ...

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