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LP3878-ADJ

www.ti.com

SNVS311B –MAY 2005–REVISED APRIL 2013

LP3878-ADJ Micropower 800mA Low Noise "Ceramic Stable" Adjustable Voltage

Regulator for 1V to 5V Applications

Check for Samples: LP3878-ADJ

FEATURES

DESCRIPTION

The LP3878-ADJ is an 800 mA adjustable output

• 1.0V to 5.5V Output

voltage regulator designed to provide high

• Designed for Use with Low ESR Ceramic

performance and low noise in applications requiring

Capacitors

output voltages as low as 1.0V.

• Very Low Output Noise

Using an optimized VIP™ (Vertically Integrated PNP)

• 8 Lead SO PowerPAD and WSON Surface

process, the LP3878-ADJ delivers superior

Mount Package

performance:

• <10 μA Quiescent Current in Shutdown

Ground Pin Current: Typically 5.5 mA @ 800 mA

• Low Ground Pin Current at all Loads

load, and 180 µA @ 100 µA load.

• Over-Temperature/Oover-Current Protection

Low Power Shutdown: The LP3878-ADJ draws less

• -40°C to +125°C Operating Junction

than 10 μA quiescent current when shutdown pin is

pulled low.

Temperature Range

Precision Output: Ensured output voltage accuracy

APPLICATIONS

is 1% at room temperature.

• ASIC Power Supplies In:

Low Noise: Broadband output noise is only 18 μV

– Desktops, Notebooks and Graphic Cards

(typical) with 10 nF bypass capacitor.

– Set Top Boxes, Printers and Copiers

• DSP and FPGA Power Supplies

• SMPS Post-Regulator

• Medical Instrumentation

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.

2VIP is a trademark of Texas Instruments.

3All other 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)

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LP3878-ADJ www.ti.com SNVS311B – MAY 2005 – REVISED APRIL 2013 LP3878-ADJ Micropower 800mA Low Noise "Ceramic Stable" Adjustable Voltage Regulator for 1V to 5V Applications Check for Samples: LP3878-ADJ FEATURES DESCRIPTION • • The LP3878-ADJ is an 800 mA adjustable output voltage regulator designed to provide high performance and low noise in applications requiring output voltages as low as 1.0V. 1 23 • • • • • • 1.0V to 5.
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LP3878-ADJ SNVS311B – MAY 2005 – REVISED APRIL 2013 www.ti.com Basic Application Circuit OUTPUT CFF 6 4 1 5 *4.7 PF (Ceramic or Tantalum recommended) + *0.01 PF **S/D *10 PF (Ceramic recommended) + - + R1 2 N/C 7 N/C 8 R2 + 1.0V LP3878-ADJ 3 *Capacitance values shown are minimum required to assure stability. Larger output capacitor provides improved dynamic response. Output capacitor must meet ESR requirements (see Application Information).
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LP3878-ADJ www.ti.com SNVS311B – MAY 2005 – REVISED APRIL 2013 PIN DESCRIPTIONS Pin Name Function 1 BYPASS 2 N/C 3 GROUND 4 INPUT 5 OUTPUT 6 ADJ Provides feedback to error amplifier from the resistive divider that sets the output voltage. 7 N/C No internal connection. 8 SHUTDOWN Output is enabled above turn-on threshold voltage. Pull down to turn off regulator output.
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LP3878-ADJ SNVS311B – MAY 2005 – REVISED APRIL 2013 www.ti.com Electrical Characteristics Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the temperature range of -40°C to 125°C. Limits are specified through design, testing, or correlation. The limits are used to calculate TI's Average Outgoing Quality Level (AOQL). Unless otherwise specified: VIN = 3.0V, VOUT = 1V, IL = 1 mA, COUT = 10 µF, CIN = 4.7 µF, VS/D = 2V, CBYPASS = 10 nF.
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LP3878-ADJ www.ti.com SNVS311B – MAY 2005 – REVISED APRIL 2013 Typical Performance Characteristics Unless otherwise specified: VIN = 3.3V, VOUT = 1V, IL = 1 mA, CIN = 4.7 µF, COUT = 10 µF, VS/D = 2V, CBYP = 10 nF, TJ = 25°C. IGND vs Temperature Minimum VIN Over Temperature 10.0 9.0 8.0 IGND (mA) 7.0 IL = 800 mA 6.0 5.0 4.0 3.0 IL = 240 mA 2.0 1.0 IL = 1 mA 0 -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (°C) Figure 3. Figure 4. IGND vs ILoad VOUT vs Temperature 1.020 1.015 VOUT (V) 1.
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LP3878-ADJ SNVS311B – MAY 2005 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified: VIN = 3.3V, VOUT = 1V, IL = 1 mA, CIN = 4.7 µF, COUT = 10 µF, VS/D = 2V, CBYP = 10 nF, TJ = 25°C. Minimum VIN vs VOUT Ripple Rejection 4.0 100 TJ = -40°C 90 IL = 400 mA 3.5 80 RIPPLE REJECTION (dB) IL = 800 mA VIN (V) 3.0 2.5 2.0 IL = 100 mA 70 60 50 40 30 20 1.5 10 1.0 1.0 1.5 2.0 2.5 3.0 3.
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LP3878-ADJ www.ti.com SNVS311B – MAY 2005 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Unless otherwise specified: VIN = 3.3V, VOUT = 1V, IL = 1 mA, CIN = 4.7 µF, COUT = 10 µF, VS/D = 2V, CBYP = 10 nF, TJ = 25°C. Line Transient Response Line Transient Response Figure 15. Figure 16. Line Transient Response Line Transient Response Figure 17. Figure 18. Line Transient Response Line Transient Response Figure 19. Figure 20.
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LP3878-ADJ SNVS311B – MAY 2005 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified: VIN = 3.3V, VOUT = 1V, IL = 1 mA, CIN = 4.7 µF, COUT = 10 µF, VS/D = 2V, CBYP = 10 nF, TJ = 25°C. 8 Line Transient Response Line Transient Response Figure 21. Figure 22. Line Transient Response Line Transient Response Figure 23. Figure 24. Load Transient Response Load Transient Response Figure 25. Figure 26.
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LP3878-ADJ www.ti.com SNVS311B – MAY 2005 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Unless otherwise specified: VIN = 3.3V, VOUT = 1V, IL = 1 mA, CIN = 4.7 µF, COUT = 10 µF, VS/D = 2V, CBYP = 10 nF, TJ = 25°C. Load Transient Response Load Transient Response Figure 27. Figure 28. Turn-On Characteristics 1.2 1 1 25oC 0o C 0.6 0.8 VOUT (V) 0.8 VOUT (V) Turn-Off Characteristics 1.2 25oC 0.4 0.6 125oC 0.4 o 125 C 0.2 0o C 0.2 0 0 0 0.5 1 1.5 2 0 0.
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LP3878-ADJ SNVS311B – MAY 2005 – REVISED APRIL 2013 www.ti.com Block Diagram ADJ BYPASS INPUT OUTPUT 6 1 4 5 Error Amp 2 N/C 8 SHUTDOWN + + 1.0V VREF 7 LP3878-ADJ GROUND N/C 3 APPLICATION INFORMATION PACKAGE INFORMATION The LP3878-ADJ is offered in the 8 lead SO PowerPAD or WSON surface mount packages to allow for increased power dissipation compared to the SO-8 and Mini SO-8.
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LP3878-ADJ www.ti.com SNVS311B – MAY 2005 – REVISED APRIL 2013 10 ESR (:) 1 0.1 STABLE REGION 0.01 0.001 0 200 400 600 800 LOAD CURRENT (mA) Figure 31. Stable Region For Output Capacitor ESR NOTE Important: The output capacitor must maintain its ESR within the stable region over the full operating temperature range of the application to assure stability.
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LP3878-ADJ SNVS311B – MAY 2005 – REVISED APRIL 2013 www.ti.com FEEDFORWARD CAPACITOR The feedforward capacitor designated CFF in the Basic Application circuit is required to increase phase margin and assure loop stability. Improved phase margin also gives better transient response to changes in load or input voltage, and faster settling time on the output voltage when transients occur.
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LP3878-ADJ www.ti.com SNVS311B – MAY 2005 – REVISED APRIL 2013 However, if the output is pulled above the input, this diode will turn ON and current will flow into the regulator output. In such cases, a parasitic SCR can latch which will allow a high current to flow into VIN (and out the ground pin), which can damage the part.
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LP3878-ADJ SNVS311B – MAY 2005 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision A (April 2013) to Revision B • 14 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 12-May-2014 (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-May-2014 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 LP3878MRX-ADJ/NOPB SO Power PAD DDA 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LP3878SD-ADJ/NOPB WSON NGT 8 1000 180.0 12.4 4.3 4.3 1.1 8.0 12.0 Q1 LP3878SDX-ADJ/NOPB WSON NGT 8 4500 180.0 12.4 4.3 4.3 1.1 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-May-2014 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LP3878MRX-ADJ/NOPB SO PowerPAD DDA 8 2500 367.0 367.0 35.0 LP3878SD-ADJ/NOPB WSON NGT 8 1000 203.0 203.0 35.0 LP3878SDX-ADJ/NOPB WSON NGT 8 4500 346.0 346.0 35.
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MECHANICAL DATA DDA0008B MRA08B (Rev B) www.ti.
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MECHANICAL DATA NGT0008A SDC08A (Rev A) www.ti.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.