Datasheet

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OUT

GND

LP38511-ADJ

OUT

10 PF

Ceramic

OUT

10 PF

Ceramic

GND

OFF

ADJ

LP38511-ADJ

www.ti.com

SNVS545D –JANUARY 2009–REVISED APRIL 2013

LP38511-ADJ 800mA Fast-Transient Response Adjustable Low-Dropout Linear Voltage

Regulator

Check for Samples: LP38511-ADJ

FEATURES

APPLICATIONS

• 2.25V to 5.5V Input Voltage Range

• Digital Core ASICs, FPGAs, and DSPs

• Adjustable Output Voltage Range of 0.5V to • Servers

3.3V

• Routers and Switches

• 800mA Output Load Current

• Base Stations

• ±2.0% Accuracy over Line, Load, and Full-

• Storage Area Networks

Temperature Range from -40°C to +125°C

• DDR2 Memory

• Stable with Tiny 10 uF Ceramic Capacitors

DESCRIPTION

• Enable Pin

The LP38511-ADJ Fast-Transient Response Low-

Dropout Voltage Regulator offers the highest-

• Typically Less than 1uA of Ground Pin Current

performance in meeting AC and DC accuracy

with Enable Pin Low

requirements for powering Digital Cores. The

• 25dB of PSRR at 100 kHz

LP38511-ADJ uses a proprietary control loop that

• Over-Temperature and Over-Current

enables extremely fast response to change in line

Protection

conditions and load demands. Output Voltage DC

accuracy is specified at 2.5% over line, load and full

• 8-Pin SO PowerPad and 5-Pin PFM Surface

temperature range from -40°C to +125°C. The

Mount Packages

LP38511-ADJ is designed for inputs from the 2.5V,

3.3V, and 5.0V rail, is stable with 10 uF ceramic

capacitors, and has an adjustable output voltage. The

LP38511-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

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (21 pages)

PAGE 1
LP38511-ADJ www.ti.com SNVS545D – JANUARY 2009 – REVISED APRIL 2013 LP38511-ADJ 800mA Fast-Transient Response Adjustable Low-Dropout Linear Voltage Regulator Check for Samples: LP38511-ADJ FEATURES APPLICATIONS • • • • • • • • 1 2 • • • • • • • • 2.25V to 5.5V Input Voltage Range Adjustable Output Voltage Range of 0.5V to 3.3V 800mA Output Load Current ±2.
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LP38511-ADJ SNVS545D – JANUARY 2009 – REVISED APRIL 2013 www.ti.com Connection Diagram LP38511TJ-ADJ EN 1 IN 2 GND 3 OUT 4 ADJ 5 Exposed DAP OUT 1 8 IN OUT 2 7 IN ADJ 3 6 EN N/C 4 5 GND DAP Connect to GND Figure 1. 5-Pin PFM, Top View See NDQ0005A Package Figure 2. 8-Pin SO PowerPad, Top View See DDA0008A Package Pin Descriptions for PFM Package Pin # Pin Name Function EN Enable. Pull high to enable the output, low to disable the output.
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LP38511-ADJ www.ti.com SNVS545D – JANUARY 2009 – REVISED APRIL 2013 Absolute Maximum Ratings (1) (2) −65°C to +150°C Storage Temperature Range Soldering Temperature (3) PFM 260°C, 10s SO PowerPad 260°C, 10s ESD Rating (4) ±2 kV Power Dissipation (5) Internally Limited Input Pin Voltage (Survival) -0.3V to +6.0V Enable Pin Voltage (Survival) -0.3V to +6.0V Output Pin Voltage (Survival) -0.3V to +6.0V ADJ Pin Voltage (Survival) -0.3V to +6.
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LP38511-ADJ SNVS545D – JANUARY 2009 – REVISED APRIL 2013 www.ti.com Electrical Characteristics (continued) Unless otherwise specified: VIN= 2.50V, VOUT= VADJ, IOUT= 10 mA, CIN= 10 µF, COUT= 10 µF, VEN= 2.0V. Limits in standard type are for TJ= 25°C only; limits in boldface type apply over the junction temperature (TJ) range of -40°C to +125°C. Minimum and Maximum limits are ensured through test, design, or statistical correlation.
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LP38511-ADJ www.ti.com SNVS545D – JANUARY 2009 – REVISED APRIL 2013 Typical Performance Characteristics Unless otherwise specified: TJ = 25°C, VIN = 2.50V, VOUT= VADJ, VEN = 2.0V, CIN = 10 µF, COUT = 10 µF, IOUT = 10 mA. VADJ vs Temperature VOUT vs VIN Figure 3. Figure 4. Ground Pin Current (IGND) vs VIN Ground Pin Current (IGND) vs Temperature Figure 5. Figure 6. Ground Pin Current (IGND) vs Temperature Enable Threshold vs Temperature Figure 7. Figure 8.
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LP38511-ADJ SNVS545D – JANUARY 2009 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified: TJ = 25°C, VIN = 2.50V, VOUT= VADJ, VEN = 2.0V, CIN = 10 µF, COUT = 10 µF, IOUT = 10 mA. 6 VOUT vs VEN Load regulation vs Temperature Figure 9. Figure 10. Line Regulation vs Temperature Current Limit vs Temperature Figure 11. Figure 12. Load Transient, 10 mA to 800 mA VOUT = VADJ, COUT = 10 μF Ceramic Load Transient, 10 mA to 800 mA VOUT = 1.
PAGE 7
LP38511-ADJ www.ti.com SNVS545D – JANUARY 2009 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Unless otherwise specified: TJ = 25°C, VIN = 2.50V, VOUT= VADJ, VEN = 2.0V, CIN = 10 µF, COUT = 10 µF, IOUT = 10 mA. Load Transient, 250 mA to 800 mA VOUT = 1.20V, COUT = 10 μF Ceramic Line Transient VOUT = VADJ, COUT = 10 μF Ceramic Figure 15. Figure 16. Line Transient VOUT = 1.20V, COUT = 10 μF Ceramic PSRR, IOUT = 100 mA VOUT = VADJ, COUT = 10 μF Ceramic Figure 17. Figure 18.
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LP38511-ADJ SNVS545D – JANUARY 2009 – REVISED APRIL 2013 www.ti.
PAGE 9
LP38511-ADJ www.ti.com SNVS545D – JANUARY 2009 – REVISED APRIL 2013 APPLICATION INFORMATION EXTERNAL CAPACITORS Like any low-dropout regulator, external capacitors are required 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. For general usage across all load currents and operating conditions, a 10 µF ceramic input capacitor will provide satisfactory performance.
PAGE 10
LP38511-ADJ SNVS545D – JANUARY 2009 – REVISED APRIL 2013 www.ti.com SETTING THE OUTPUT VOLTAGE The output voltage is set using the external resistive divider R1 and R2. The output voltage is given by the formula: VOUT = VADJ x (1 + (R1/R2)) (1) The resistors used for R1 and R2 should be high quality, tight tolerance, and with matching temperature coefficients. It is important to remember that, although the value of VADJ is specified, the final value of VOUT is not.
PAGE 11
LP38511-ADJ www.ti.com SNVS545D – JANUARY 2009 – REVISED APRIL 2013 Please refer to Application Note AN-1378 Method For Calculating Output Voltage Tolerances in Adjustable Regulators SNVA112 for additional information on how resistor tolerances affect the calculated VOUT value. ENABLE OPERATION The Enable ON threshold is typically 1.2V, and the OFF threshold is typically 1.0V.
PAGE 12
LP38511-ADJ SNVS545D – JANUARY 2009 – REVISED APRIL 2013 www.ti.com Figure 21. θJA vs Thermal Via Count for the PFM Package on 4–Layer PCB Figure 22 shows the thermal performance when the PFM is mounted to a two layer PCB where the copper area is predominately directly under the exposed DAP. As shown in the figure, increasing the copper area beyond 1 square inch produces very little improvement. Figure 22.
PAGE 13
LP38511-ADJ www.ti.com SNVS545D – JANUARY 2009 – REVISED APRIL 2013 Figure 23. θJA vs Thermal Via Count for the SO PowerPad Package on 4–Layer PCB Figure 24 shows thermal performance for a two layer board using thermal vias to a copper area on the bottom of the PCB. The copper area on the top of the PCB, which is soldered to the exposed DAP, is 0.10in x 0.20in, which is approximately the same dimensions as the body of the SO PowerPad package.
PAGE 14
LP38511-ADJ SNVS545D – JANUARY 2009 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision C (April 2013) to Revision D • 14 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
PAGE 15
PACKAGE OPTION ADDENDUM www.ti.
PAGE 16
PACKAGE OPTION ADDENDUM www.ti.com 21-May-2013 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
PAGE 17
PACKAGE MATERIALS INFORMATION www.ti.com 29-May-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LP38511MRX-ADJ/NOPB SO Power PAD DDA 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LP38511TJ-ADJ/NOPB TO-263 NDQ 5 1000 330.0 24.4 10.6 15.4 2.45 12.0 24.
PAGE 18
PACKAGE MATERIALS INFORMATION www.ti.com 29-May-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LP38511MRX-ADJ/NOPB LP38511TJ-ADJ/NOPB SO PowerPAD DDA 8 2500 367.0 367.0 35.0 TO-263 NDQ 5 1000 367.0 367.0 35.
PAGE 19
MECHANICAL DATA NDQ0005A TJ5A (Rev F) www.ti.
PAGE 20
MECHANICAL DATA DDA0008A MRA08A (Rev D) www.ti.
PAGE 21
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