LP38512MRX-ADJ/NOPB National Semiconductor, LP38512MRX-ADJ/NOPB Datasheet

IC REG LDO 1.5A ADJ 8-PSOP

LP38512MRX-ADJ/NOPB

Manufacturer Part Number
LP38512MRX-ADJ/NOPB
Description
IC REG LDO 1.5A ADJ 8-PSOP
Manufacturer
National Semiconductor
Datasheet

Specifications of LP38512MRX-ADJ/NOPB

Regulator Topology
Positive Adjustable
Voltage - Output
0.5 ~ 4.5 V
Voltage - Input
2.25 ~ 5.5 V
Number Of Regulators
1
Current - Output
1.5A (Max)
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-PSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Dropout (typical)
-
Current - Limit (min)
-
Other names
LP38512MRX-ADJ

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LP38512MRX-ADJ/NOPB
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© 2009 National Semiconductor Corporation
1.5A Fast-Transient Response Adjustable Low-Dropout
Linear Voltage Regulator
General Description
The LP38512-ADJ Fast-Transient Response Low-Dropout
Voltage Regulator offers the highest-performance in meeting
AC and DC accuracy requirements for powering Digital
Cores. The LP38512-ADJ 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-ADJ is designed for inputs
from the 2.5V, 3.3V, and 5.0V rail, is stable with 10 μF ceramic
capacitors, and has an adjustable output voltage. The
LP38512-ADJ provides excellent transient performance to
meet the demand of high performance digital core ASICs,
DSPs, and FPGAs found in highly-intensive applications such
as servers, routers/switches, and base stations.
Typical Application Circuit
300409
LP38512-ADJ
Features
Applications
2.25V to 5.5V Input Voltage Range
Adjustable Output Voltage Range of 0.5V to 4.5V
1.5A Output Load Current
±2.0% Accuracy over Line, Load, and Full-Temperature
Range from -40°C to +125°C
Stable with tiny 10 µF ceramic capacitors
Enable pin
Typically less than 1uA of Ground pin current in when
Enable pin is low
25dB of PSRR at 100 kHz
Over-Temperature and Over-Current Protection
PSOP-8 and TO263 THIN Surface Mount Packages
Digital Core ASICs, FPGAs, and DSPs
Servers
Routers and Switches
Base Stations
Storage Area Networks
DDR2 Memory
30040901
February 12, 2009
www.national.com

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LP38512MRX-ADJ/NOPB Summary of contents

Page 1

... LP38512-ADJ provides excellent transient performance to meet the demand of high performance digital core ASICs, DSPs, and FPGAs found in highly-intensive applications such as servers, routers/switches, and base stations. Typical Application Circuit © 2009 National Semiconductor Corporation LP38512-ADJ Features ■ 2.25V to 5.5V Input Voltage Range ■ ...

Page 2

... Ordering Information Output Order Voltage Number LP38512MR-ADJ ADJ LP38512MRX-ADJ LP38512TJ-ADJ Connection Diagrams Top View TO-263 THIN 5-Pin Package Pin Descriptions for TO-263 THIN (TJ) Package Pin # Pin Name Function Enable. Pull high to enable the output, low to disable the output. This pin has no internal bias and ...

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

Page 4

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 θ Junction to Ambient J-A (Note 4) Thermal Resistance ...

Page 5

Typical Performance Characteristics V = 2.0V µ µ OUT V vs Temperature ADJ Ground Pin Current (I GND Ground Pin Current ( Temperature GND Unless otherwise specified ...

Page 6

OUT Line Regulation vs Temperature Load Transient 1. μF Ceramic OUT ADJ OUT www.national.com EN 30040932 30040921 30040923 6 Load regulation vs Temperature 30040920 Current Limit vs ...

Page 7

Load Transient, 500 μF Ceramic V = 1.20V, C OUT OUT 30040925 Line Transient = 10 μF Ceramic V = 1.20V, C OUT OUT 30040927 PSRR 1.5A OUT = 10 μF Ceramic V ...

Page 8

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 9

Please refer to the POW- ER DISSIPATION/HEAT-SINKING section for power dissi- pation calculations. SETTING THE OUTPUT VOLTAGE The output voltage is set using the ...

Page 10

The maximum allowable junction temperature rise (ΔT pends on the maximum expected ambient temperature ( the application, and the maximum allowable junction (MAX) temperature (T ): J(MAX) Δ − J(MAX) A(MAX) The maximum allowable ...

Page 11

FIGURE 4. θ vs Thermal Via Count for the PSOP-8 JA Package on 2–Layer PCB with Copper Area on Bottom- Side Figure 5 shows thermal performance for a two layer board with the DAP soldered to copper area on the ...

Page 12

Physical Dimensions TO-263 THIN, 5 Lead, Molded, 1.7mm Pitch, Surface Mount www.national.com inches (millimeters) unless otherwise noted NS Package Number TJ5A PSOP, 8-Lead, Molded, 0.050in Pitch, Surface Mount NS Package Number MRA08A 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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