Datasheet

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LP3872, LP3875

www.ti.com

SNVS227F –FEBRUARY 2003–REVISED APRIL 2013

LP3872/LP3875 1.5A Fast Ultra Low Dropout Linear Regulators

Check for Samples: LP3872, LP3875

FEATURES

DESCRIPTION

The LP3872/LP3875 series of fast ultra low-dropout

• Ultra Low Dropout Voltage

linear regulators operate from a +2.5V to +7.0V input

• Low Ground Pin Current

supply. Wide range of preset output voltage options

• Load Regulation of 0.06%

are available. These ultra low dropout linear

regulators respond very quickly to step changes in

• 10nA Quiescent Current in Shutdown Mode

load, which makes them suitable for low voltage

• Ensured Output Current of 1.5A DC

microprocessor applications. The LP3872/LP3875 are

• Available in DDPAK/TO-263, TO-220 and

developed on a CMOS process which allows low

SOT-223 Packages

quiescent current operation independent of output

load current. This CMOS process also allows the

• Output Voltage Accuracy ± 1.5%

LP3872/LP3875 to operate under extremely low

• Error Flag Indicates Output Status

dropout conditions.

• Sense Option Improves Load Regulation

Dropout Voltage: Ultra low dropout voltage; typically

• Minimum Output Capacitor Requirements

38mV at 150mA load current and 380mV at 1.5A load

• Overtemperature/Overcurrent Protection

current.

• −40°C to +125°C Junction Temperature Range

Ground Pin Current: Typically 6mA at 1.5A load

current.

APPLICATIONS

Shutdown Mode: Typically 10nA quiescent current

• Microprocessor Power Supplies

when the shutdown pin is pulled low.

• GTL, GTL+, BTL, and SSTL Bus Terminators

Error Flag: Error flag goes low when the output

• Power Supplies for DSPs

voltage drops 10% below nominal value.

• SCSI Terminator

SENSE: Sense pin improves regulation at remote

• Post Regulators

loads.

• High Efficiency Linear Regulators

Precision Output Voltage: Multiple output voltage

• Battery Chargers

options are available ranging from 1.8V to 5.0V with a

specified accuracy of ±1.5% at room temperature,

• Other Battery Powered Applications

and ±3.0% over all conditions (varying line, load, and

temperature).

TYPICAL APPLICATION CIRCUITS

*SD and ERROR pins must be pulled high through a 10kΩ pull-up resistor. Connect the ERROR pin to ground if this

function is not used. See application hints for more information.

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 (25 pages)

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LP3872, LP3875 www.ti.com SNVS227F – FEBRUARY 2003 – REVISED APRIL 2013 LP3872/LP3875 1.5A Fast Ultra Low Dropout Linear Regulators Check for Samples: LP3872, LP3875 FEATURES DESCRIPTION • • • • • • The LP3872/LP3875 series of fast ultra low-dropout linear regulators operate from a +2.5V to +7.0V input supply. Wide range of preset output voltage options are available.
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LP3872, LP3875 SNVS227F – FEBRUARY 2003 – REVISED APRIL 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. *SD must be pulled high through a 10kΩ pull-up resistor. See application hints for more information. CONNECTION DIAGRAM Figure 1. 5-Pin TO-220 (Top View) See NDH0005D Package Figure 2.
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LP3872, LP3875 www.ti.com SNVS227F – FEBRUARY 2003 – REVISED APRIL 2013 Table 2. Pin Descriptions for SOT-223 Package (continued) Pin # 5 LP3872 Name GND LP3875 Function Ground Name GND Function Ground BLOCK DIAGRAM Figure 4. LP3872 Figure 5.
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LP3872, LP3875 SNVS227F – FEBRUARY 2003 – REVISED APRIL 2013 ABSOLUTE MAXIMUM RATINGS www.ti.com (1) If Military/Aerospace specified devices are required, contact the Texas Instruments Sales Office/Distributors for availability and specifications. VALUE / UNITS −65°C to +150°C Storage Temperature Range Lead Temperature (Soldering, 5 sec.) ESD Rating 260°C (2) Power Dissipation 2 kV (3) Internally Limited Input Supply Voltage (Survival) −0.3V to +7.5V Shutdown Input Voltage (Survival) −0.
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LP3872, LP3875 www.ti.com SNVS227F – FEBRUARY 2003 – REVISED APRIL 2013 ELECTRICAL CHARACTERISTICS – LP3872/LP3875 Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range. Unless otherwise specified: VIN = VO(NOM) + 1V, IL = 10 mA, COUT = 10µF, VSD = 2V. Symbol Parameter Output Voltage Tolerance VO ΔV OL ΔVO/ ΔIOUT Conditions Typ (1) (3) Output Voltage Line Regulation VOUT +1V ≤ VIN ≤ 7.0V, 10 mA ≤ IL ≤ 1.
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LP3872, LP3875 SNVS227F – FEBRUARY 2003 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise specified: TJ = 25°C, COUT = 10µF, CIN = 10µF, S/D pin is tied to VIN, VOUT = 2.5V, VIN = VO(NOM) + 1V, IL = 10mA Ground Current vs Output Voltage IL = 1.5A Dropout Voltage vs Output Load Current 6 500 12 400 o 5C C o 25 300 oC 200 - 40 100 5 GROUND PIN CURRENT (mA)_ DROPOUT VOLTAGE (mV) 600 4 3 2 1 0 0 0.5 0 1.8 1.5 1 2.3 2.8 3.3 3.8 4.3 5.
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LP3872, LP3875 www.ti.com SNVS227F – FEBRUARY 2003 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified: TJ = 25°C, COUT = 10µF, CIN = 10µF, S/D pin is tied to VIN, VOUT = 2.5V, VIN = VO(NOM) + 1V, IL = 10mA Load Transient Response CIN = COUT = 10µF, OSCON Noise vs Frequency 3.000 VOUT 100mV/DIV 2.500 MAGNITUDE NOISE (PV/ Hz ( IL = 100mA CIN = COUT = 10PF 2.000 1.500 1.000 ILOAD 1A/DIV 0.500 0.
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LP3872, LP3875 SNVS227F – FEBRUARY 2003 – REVISED APRIL 2013 www.ti.com Application Hints 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: An input capacitor of at least 10µF is required. Ceramic, Tantalum, or Electrolytic capacitors may be used, and capacitance may be increased without limit OUTPUT CAPACITOR: An output capacitor is required for loop stability.
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LP3872, LP3875 www.ti.com SNVS227F – FEBRUARY 2003 – REVISED APRIL 2013 TANTALUM: Solid Tantalum capacitors are recommended for use on the output because their typical ESR is very close to the ideal value required for loop compensation. They also work well as input capacitors if selected to meet the ESR requirements previously listed.
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LP3872, LP3875 SNVS227F – FEBRUARY 2003 – REVISED APRIL 2013 www.ti.com If a load is connected to the IC output which switches at high speed (such as a clock), the high-frequency current pulses required by the load must be supplied by the capacitors on the IC output. Since the bandwidth of the regulator loop is less than 100 kHz, the control circuitry cannot respond to load changes above that frequency.
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LP3872, LP3875 www.ti.com SNVS227F – FEBRUARY 2003 – REVISED APRIL 2013 Figure 19. Error Flag Operation SENSE PIN In applications where the regulator output is not very close to the load, LP3875 can provide better remote load regulation using the SENSE pin. Figure 20 depicts the advantage of the SENSE option. LP3872 regulates the voltage at the output pin. Hence, the voltage at the remote load will be the regulator output voltage minus the drop across the trace resistance. For example, in the case of a 3.
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LP3872, LP3875 SNVS227F – FEBRUARY 2003 – REVISED APRIL 2013 www.ti.com DROPOUT VOLTAGE The dropout voltage of a regulator is defined as the minimum input-to-output differential required to stay within 2% of the nominal output voltage. For CMOS LDOs, the dropout voltage is the product of the load current and the Rds(on) of the internal MOSFET. REVERSE CURRENT PATH The internal MOSFET in LP3872 and LP3875 has an inherent parasitic diode.
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LP3872, LP3875 www.ti.com SNVS227F – FEBRUARY 2003 – REVISED APRIL 2013 Figure 21. θJA vs Copper (1 Ounce) Area for DDPAK/TO-263 package As shown in the figure, increasing the copper area beyond 1 square inch produces very little improvement. The minimum value for θJA for the DDPAK/TO-263 package mounted to a PCB is 32°C/W.
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LP3872, LP3875 SNVS227F – FEBRUARY 2003 – REVISED APRIL 2013 www.ti.com Figure 24. SCENARIO A, θJA = 148°C/W 14 Figure 25.
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LP3872, LP3875 www.ti.com SNVS227F – FEBRUARY 2003 – REVISED APRIL 2013 REVISION HISTORY Changes from Revision E (April 2013) to Revision F • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LP3872EMP-1.8/NOPB ACTIVE SOT-223 NDC 5 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 LHAB LP3872EMP-2.5/NOPB ACTIVE SOT-223 NDC 5 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 LHBB LP3872EMP-3.
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PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 1-Nov-2013 Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LP3872ESX-3.3/NOPB ACTIVE DDPAK/ TO-263 KTT 5 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LP3872ES -3.3 LP3872ESX-5.0/NOPB ACTIVE DDPAK/ TO-263 KTT 5 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LP3872ES -5.0 LP3875EMP-1.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-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 LP3872EMP-1.8/NOPB SOT-223 NDC 5 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3 LP3872EMP-2.5/NOPB SOT-223 NDC 5 1000 330.0 LP3872EMP-3.3 SOT-223 NDC 5 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3 16.4 7.0 7.5 2.2 12.0 16.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 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 LP3875EMP-5.0 SOT-223 NDC 5 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3 LP3875EMP-5.0/NOPB SOT-223 NDC 5 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3 LP3875ESX-1.8/NOPB DDPAK/ TO-263 KTT 5 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 LP3875ESX-2.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LP3872ESX-3.3/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LP3872ESX-5.0/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LP3875EMP-1.8/NOPB SOT-223 NDC 5 1000 367.0 367.0 35.0 LP3875EMP-2.5/NOPB SOT-223 NDC 5 1000 367.0 367.0 35.0 LP3875EMP-3.3/NOPB SOT-223 NDC 5 1000 367.0 367.0 35.0 LP3875EMP-5.0 SOT-223 NDC 5 1000 367.
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MECHANICAL DATA NDH0005D www.ti.
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MECHANICAL DATA NDC0005A www.ti.
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MECHANICAL DATA KTT0005B TS5B (Rev D) BOTTOM SIDE OF PACKAGE 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.