Product Folder Sample & Buy Support & Community Tools & Software Technical Documents LP2981-28, LP2981-29, LP2981-30 LP2981-33, LP2981-50, LP2981A-28 LP2981A-29, LP2981A-30, LP2981A-33, LP2981A-50 SLVS521G – JULY 2004 – REVISED AUGUST 2016 LP2981 100-mA Ultra-Low Dropout Regulators With Shutdown 1 Features 3 Description • The LP2981 and LP2981A families of fixed-output, low-dropout regulators offer exceptional, costeffective performance for both portable and nonportable applications. Available in fixed voltages of 2.8 V, 3 V, 3.3 V, and 5 V, the family has an output tolerance of 0.75% for the A-grade devices (1.25% for the standard grade) and is capable of delivering 100-mA continuous load current. Standard regulator features, such as overcurrent and overtemperature protection, are included. 1 • • • • • • • • Output Tolerance of – 0.75% (A Grade) – 1.25% (Standard Grade) Ultra-Low Dropout Typically: – 200 mV at Full Load of 100 mA – 7 mV at 1 mA Low IQ: 600 µA Typical at Full Load of 100 mA Shutdown Current: 0.01 µA Typical Fast Transient Response to Line and Load Overcurrent and Thermal Protection High Peak Current Capability Low ZOUT Over Wide Frequency Range −40°C to 125°C Temperature Range The LP2981 and LP2981A have features that make the regulators ideal candidates for a variety of portable applications: • Low dropout: A PNP pass element allows a typical dropout of 200 mV at 100-mA load current and 7 mV at 1-mA load. • Low quiescent current: The use of a vertical PNP process allows for quiescent currents that are considerably lower than those associated with traditional lateral PNP regulators. • Shutdown: A shutdown feature is available, allowing the regulator to consume only 0.01 µA when the ON/OFF pin is pulled low. 2 Applications • • • • • Smart Meters Servo and Motor Control Mobile Phones and Cameras Audio and Portable Speakers Telecommunication and Networking Device Information(1) PART NUMBER LP2981-XXDBV LP2981A-XXDBV PACKAGE (PINS) SOT-23 (5) BODY SIZE (NOM) 2.90 mm × 1.60 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Block Diagram V IN ON/OFF 1.23 V í VREF + R1 VOUT R2 Overcurrent/ Overtemperature Protection GND Copyright © 2016, Texas Instruments Incorporated 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. LP2981-28, LP2981-29, LP2981-30 LP2981-33, LP2981-50, LP2981A-28 LP2981A-29, LP2981A-30, LP2981A-33, LP2981A-50 SLVS521G – JULY 2004 – REVISED AUGUST 2016 www.ti.com Table of Contents 1 2 3 4 5 6 7 Features .................................................................. Applications ........................................................... Description ............................................................. Revision History..................................................... Pin Configuration and Functions ......................... Specifications......................................................... 1 1 1 2 3 3 6.1 6.2 6.3 6.4 6.5 6.6 6.7 3 3 4 4 4 5 6 Absolute Maximum Ratings ...................................... ESD Ratings.............................................................. Recommended Operating Conditions....................... Thermal Information .................................................. Electrical Characteristics: LP2981-xx ...................... Electrical Characteristics: LP2981A-xx ..................... Typical Characteristics .............................................. Detailed Description .............................................. 7 7.1 Overview ................................................................... 7 7.2 Functional Block Diagram ......................................... 7 7.3 Feature Description................................................... 7 7.4 Device Functional Modes.......................................... 9 8 Application and Implementation ........................ 10 8.1 Application Information............................................ 10 8.2 Typical Application ................................................. 10 9 Power Supply Recommendations...................... 12 10 Layout................................................................... 12 10.1 Layout Guidelines ................................................. 12 10.2 Layout Example .................................................... 12 11 Device and Documentation Support ................. 13 11.1 11.2 11.3 11.4 11.5 11.6 Related Links ........................................................ Receiving Notification of Documentation Updates Community Resources.......................................... Trademarks ........................................................... Electrostatic Discharge Caution ............................ Glossary ................................................................ 13 13 13 13 13 13 12 Mechanical, Packaging, and Orderable Information ........................................................... 14 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision F (August 2008) to Revision G Page • Added Device Information table, ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section....................................... 1 • Changed thermal table to align with JEDEC standards ......................................................................................................... 4 2 Submit Documentation Feedback Copyright © 2004–2016, Texas Instruments Incorporated Product Folder Links: LP2981-28 LP2981-29 LP2981-30 LP2981-33 LP2981-50 LP2981A-28 LP2981A-29 LP2981A30 LP2981A-33 LP2981A-50 LP2981-28, LP2981-29, LP2981-30 LP2981-33, LP2981-50, LP2981A-28 LP2981A-29, LP2981A-30, LP2981A-33, LP2981A-50 www.ti.com SLVS521G – JULY 2004 – REVISED AUGUST 2016 5 Pin Configuration and Functions DBV Package 5-Pin SOT-23 Top View VIN 1 GND 2 ON/OFF 3 5 VOUT 4 NC Not to scale Pin Functions PIN NO. I/O NAME DESCRIPTION 1 VIN I 2 GND — Supply input 3 ON/OFF I 4 NC — No connect 5 VOUT O Voltage output Ground Active-low shutdown pin. Tie to VIN if unused. 6 Specifications 6.1 Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted) (1) (2) MIN MAX UNIT VIN Continuous input voltage –0.3 16 V VON/OFF ON/OFF input voltage –0.3 16 V VOUT Output voltage (3) –0.3 9 V IOUT Output current TJ Operating virtual junction temperature Tstg Storage temperature (1) (2) (3) Internally limited (short-circuit protected) –65 150 °C 150 °C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. The PNP pass transistor has a parasitic diode connected between the input and output. This diode normally is reverse-biased (VIN > VOUT), but is forward-biased if the output voltage exceeds the input voltage by a diode drop (see Application and Implementation for more details). If load is returned to a negative power supply, the output must be diode clamped to GND. 6.2 ESD Ratings VALUE V(ESD) (1) (2) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1) ±2000 Charged-device model (CDM), per JEDEC specification JESD22-C101 (2) ±1000 Machine model (MM) ±200 UNIT V JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process. JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process. Copyright © 2004–2016, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: LP2981-28 LP2981-29 LP2981-30 LP2981-33 LP2981-50 LP2981A-28 LP2981A-29 LP2981A30 LP2981A-33 LP2981A-50 3 LP2981-28, LP2981-29, LP2981-30 LP2981-33, LP2981-50, LP2981A-28 LP2981A-29, LP2981A-30, LP2981A-33, LP2981A-50 SLVS521G – JULY 2004 – REVISED AUGUST 2016 www.ti.com 6.3 Recommended Operating Conditions VIN Supply input voltage VON/OFF ON/OFF input voltage VIN – VOUT Input-output differential IOUT Output current TJ Virtual junction temperature (1) MIN MAX 2.2 (1) 16 V 0 VIN V 0.7 11 V 100 mA 125 °C –40 UNIT Minimum VIN of 2.2 V is needed for proper biasing of LDO control circuitry. 6.4 Thermal Information LP2981-XX THERMAL METRIC (1) DBV (SOT-23) UNIT 5 PINS RθJA Junction-to-ambient thermal resistance (2) (3) 205.2 °C/W RθJC(top) Junction-to-case (top) thermal resistance 11.83 °C/W RθJB Junction-to-board thermal resistance 37.7 °C/W ψJT Junction-to-top characterization parameter 12.2 °C/W ψJB Junction-to-board characterization parameter 33.8 °C/W (1) (2) (3) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report. Maximum power dissipation is a function of TJ(max), RθJA , and TA . The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) – TA )/ RθJA . Operating at the absolute maximum TJ of 150°C can affect reliability. The package thermal impedance is calculated in accordance with JESD 51-7. 6.5 Electrical Characteristics: LP2981-xx at specified free-air temperature range, VIN = VOUT(NOM) + 1 V, VON/OFF = 2 V, CIN = 1 µF, IL = 1 mA, COUT = 4.7 µF (unless otherwise noted) PARAMETER TEST CONDITIONS IL = 1 mA Output voltage tolerance ΔVOUT ΔVOUT/ΔVIN Output voltage line regulation IL = 1 mA to 100 mA VIN = (VOUT(NOM) + 1 V) to 16 V IL = 0 IL = 1 mA VIN – VOUT Dropout voltage (1) IL = 25 mA IL = 100 mA (1) 4 TA MIN 25°C TYP –1.25 25°C –40°C to 125°C 25°C –2 2 –3.5 3.5 0.007 1 3 7 10 70 100 15 –40°C to 125°C 25°C %/V mV 150 200 –40°C to 125°C %VNOM 5 –40°C to 125°C 25°C 0.014 0.032 –40°C to 125°C 25°C UNIT 1.25 –40°C to 125°C 25°C MAX 250 375 Dropout voltage is defined as the input-to-output differential at which the output voltage drops 100 mV below the value measured with a 1-V differential. This dropout specification does not apply to the 1.8-V option, as the minimum VIN = 2.2 V must be observed for proper biasing of LDO control circuitry. Submit Documentation Feedback Copyright © 2004–2016, Texas Instruments Incorporated Product Folder Links: LP2981-28 LP2981-29 LP2981-30 LP2981-33 LP2981-50 LP2981A-28 LP2981A-29 LP2981A30 LP2981A-33 LP2981A-50 LP2981-28, LP2981-29, LP2981-30 LP2981-33, LP2981-50, LP2981A-28 LP2981A-29, LP2981A-30, LP2981A-33, LP2981A-50 www.ti.com SLVS521G – JULY 2004 – REVISED AUGUST 2016 Electrical Characteristics: LP2981-xx (continued) at specified free-air temperature range, VIN = VOUT(NOM) + 1 V, VON/OFF = 2 V, CIN = 1 µF, IL = 1 mA, COUT = 4.7 µF (unless otherwise noted) PARAMETER TEST CONDITIONS IL = 0 Ground pin current IL = 25 mA IL = 100 mA VON/OFF < 0.3 V (OFF) VON/OFF < 0.15 V (OFF) High = O/P ON ON/OFF input voltage (2) VON/OFF Low = O/P OFF VON/OFF = 0 ON/OFF input current ION/OFF MIN TYP MAX 65 95 –40°C to 125°C IL = 1 mA IGND TA 25°C VON/OFF = 5 V 125 25°C 80 –40°C to 125°C 110 170 25°C 200 300 600 1000 –40°C to 125°C 550 25°C –40°C to 125°C µA 1700 25°C 0.01 0.8 –40°C to 105°C 0.05 2 –40°C to 125°C 5 25°C –40°C to 125°C UNIT 1.4 1.6 25°C V 0.5 –40°C to 125°C 0.15 25°C 0.01 –40°C to 125°C –1 25°C µA 5 –40°C to 125°C 15 IOUT(PK) Peak output current VOUT ≥ VOUT(NOM) – 5% 25°C 400 mA Vn Output noise voltage BW = 300 Hz to 50 kHz, (RMS) COUT = 10 µF 25°C 160 µV ΔVOUT/ΔVIN Ripple rejection f = 1 kHz, COUT = 10 µF 25°C 63 dB IOUT(MAX) Short-circuit current RL = 0 (steady state) 25°C 150 mA (2) The ON/OFF input must be actively terminated. Connect to VIN if this function is not used (see Application and Implementation). 6.6 Electrical Characteristics: LP2981A-xx at specified free-air temperature range, VIN = VOUT(NOM) + 1 V, VON/OFF = 2 V, CIN = 1 µF, IL = 1 mA, COUT = 4.7 µF (unless otherwise noted) PARAMETER TEST CONDITIONS IL = 1 mA Output voltage tolerance ΔVOUT ΔVOUT/ΔVIN Output voltage line regulation IL = 1 mA to 100 mA VIN = (VOUT(NOM) + 1 V) to 16 V IL = 0 IL = 1 mA VIN – VOUT Dropout voltage (1) IL = 25 mA IL = 100 mA (1) TA MIN TYP MAX 25°C –0.75 0.75 25°C –1 1 –40°C to 125°C 25°C –2.5 1 3 7 10 15 70 –40°C to 125°C 25°C –40°C to 125°C %/V 5 –40°C to 125°C 25°C 0.014 0.032 –40°C to 125°C 25°C %VNOM 2.5 0.007 –40°C to 125°C 25°C UNIT 100 mV 150 200 250 375 Dropout voltage is defined as the input-to-output differential at which the output voltage drops 100 mV below the value measured with a 1-V differential. This dropout specification does not apply to the 1.8-V option, as the minimum VIN = 2.2 V must be observed for proper biasing of LDO control circuitry. Copyright © 2004–2016, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: LP2981-28 LP2981-29 LP2981-30 LP2981-33 LP2981-50 LP2981A-28 LP2981A-29 LP2981A30 LP2981A-33 LP2981A-50 5 LP2981-28, LP2981-29, LP2981-30 LP2981-33, LP2981-50, LP2981A-28 LP2981A-29, LP2981A-30, LP2981A-33, LP2981A-50 SLVS521G – JULY 2004 – REVISED AUGUST 2016 www.ti.com Electrical Characteristics: LP2981A-xx (continued) at specified free-air temperature range, VIN = VOUT(NOM) + 1 V, VON/OFF = 2 V, CIN = 1 µF, IL = 1 mA, COUT = 4.7 µF (unless otherwise noted) PARAMETER TEST CONDITIONS IL = 0 95 80 25°C 200 300 600 1000 –40°C to 125°C 25°C 0.01 0.8 –40°C to 105°C 0.05 2 –40°C to 125°C 5 1.4 –40°C to 125°C 1.6 25°C Low = O/P OFF 0.15 25°C VON/OFF = 0 0.01 –40°C to 125°C –1 25°C VON/OFF = 5 V V 0.5 –40°C to 125°C ON/OFF input current µA 1700 25°C High = O/P ON ON/OFF input voltage (2) 110 550 25°C VON/OFF < 0.15 V (OFF) UNIT 170 –40°C to 125°C VON/OFF < 0.3 V (OFF) ION/OFF MAX 65 –40°C to 125°C IL = 100 mA VON/OFF TYP 125 25°C IL = 25 mA Ground pin current MIN –40°C to 125°C IL = 1 mA IGND TA 25°C 5 –40°C to 125°C µA 15 IOUT(PK) Peak output current VOUT ≥ VOUT(NOM) – 5% 25°C Vn Output noise voltage BW = 300 Hz to 50 kHz, (RMS) COUT = 10 µF 25°C ΔVOUT/ΔVIN Ripple rejection f = 1 kHz, COUT = 10 µF 25°C 63 dB IOUT(MAX) Short-circuit current RL = 0 (steady state) 25°C 150 mA (2) 150 400 mA 160 µV The ON/OFF input must be actively terminated. Connect to VIN if this function is not used (see Application and Implementation). 6.7 Typical Characteristics Output Voltage (V) Unless otherwise specified: TA = 25°C, VIN = VO(NOM) + 1 V, COUT = 10 µF, CIN = 1 µF all voltage options, ON/OFF pin tied to VIN. 3.315 3.3125 3.31 3.3075 3.305 3.3025 3.3 3.2975 3.295 3.2925 3.29 3.2875 3.285 3.2825 3.28 3.2775 0 10 20 30 40 50 60 70 Load Current (mA) 80 90 100 D001 Figure 1. Load Regulation - LP2981-33 6 Submit Documentation Feedback Copyright © 2004–2016, Texas Instruments Incorporated Product Folder Links: LP2981-28 LP2981-29 LP2981-30 LP2981-33 LP2981-50 LP2981A-28 LP2981A-29 LP2981A30 LP2981A-33 LP2981A-50 LP2981-28, LP2981-29, LP2981-30 LP2981-33, LP2981-50, LP2981A-28 LP2981A-29, LP2981A-30, LP2981A-33, LP2981A-50 www.ti.com SLVS521G – JULY 2004 – REVISED AUGUST 2016 7 Detailed Description 7.1 Overview The LP2981 and LP2981A are 100-mA fixed-output, low-dropout regulator. Available in assorted output voltages from 2.5 V to 5 V, the device has an output tolerance of 0.75% for the A grade (1.25% for the non-A version). The low-drop voltage and the ultra-low quiescent current make them suitable for low noise, low-power applications and in battery-powered systems: • Low dropout: A PNP pass element allows a typical dropout of 200 mV at 100-mA load current and 7 mV at 1-mA load. • Low quiescent current: The use of a vertical PNP process allows for quiescent currents that are considerably lower than those associated with traditional lateral PNP regulators. • Shutdown: A shutdown feature is available, allowing the regulator to consume only 0.01 µA when the ON/OFF pin is pulled low. • Small packaging: For the most space-constrained needs, the regulator is available in the SOT-23 package. 7.2 Functional Block Diagram V IN ON/OFF 1.23 V í VREF + R1 VOUT R2 Overcurrent/ Overtemperature Protection GND Copyright © 2016, Texas Instruments Incorporated 7.3 Feature Description 7.3.1 Ultra-Low Dropout Voltage The dropout voltage often refers to the voltage difference between the input and output voltage (VDO = VIN – VOUT), where the main current pass-FET is fully on in the ohmic region of operation and is characterized by the classic RDS(ON) of the FET. VDO indirectly specifies a minimum input voltage above the nominal programmed output voltage at which the output voltage is expected to remain within its accuracy boundary. The LP2981's pass-PNP allows a dropout of 200 mV at full load and 7 mV at 1 mA or lower loads. This allows for small voltage drop regulation and reduces the total power dissipation. 7.3.2 Low Ground Current LP2981 uses a vertical PNP process which allows for quiescent currents that are considerably lower than those associated with traditional lateral PNP regulators, typically 600 µA at 100-mA load and 65 µA at 1-mA load. Copyright © 2004–2016, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: LP2981-28 LP2981-29 LP2981-30 LP2981-33 LP2981-50 LP2981A-28 LP2981A-29 LP2981A30 LP2981A-33 LP2981A-50 7 LP2981-28, LP2981-29, LP2981-30 LP2981-33, LP2981-50, LP2981A-28 LP2981A-29, LP2981A-30, LP2981A-33, LP2981A-50 SLVS521G – JULY 2004 – REVISED AUGUST 2016 www.ti.com Feature Description (continued) 7.3.3 Short-Circuit Protection (Current Limit) The internal current-limit circuit is used to protect the LDO against high-load current faults or shorting events. The LDO is not designed to operate in a steady-state current limit. During a current-limit event, the LDO sources constant current. Therefore, the output voltage falls when load impedance decreases. If a current limit occurs and the resulting output voltage is low, excessive power may be dissipated across the LDO resulting in a thermal shutdown of the output. A foldback feature limits the short-circuit current to protect the regulator from damage under all load conditions. If VOUT is forced below 0 V before ON/OFF goes high and the load current required exceeds the foldback current limit, the device may not start up correctly. 7.3.4 Capacitor Characteristics 7.3.4.1 Ceramic Due to their very low ESR values, ceramic capacitors are not suitable for use as the output capacitor. For instance, a typical 2.2-µF ceramic capacitor has an ESR in the range of 10 mΩ to 20 mΩ and, thus, easily can fall out of minimum ESR requirements under certain operating conditions. If a ceramic capacitor is used at the output, a 1-Ω resistor must be placed in series with the capacitor to raise the ESR seen by the regulator. 7.3.4.2 Tantalum Solid tantalum capacitors are optimal choices for the LP2981, but they still must meet the minimum ESR requirement. Note that the ESR of a tantalum capacitor increases as temperature drops, as much as doubling from 25°C to –40°C. Thus, ESR margins must be maintained over the temperature range to prevent regulator instability. For operation at very low temperatures, paralleling a tantalum capacitor with a ceramic one keeps the combined ESR from increasing near the upper limit of the ESR curve. 7.3.4.3 Aluminum Aluminum capacitors can be used, but use with the LP2981 is impractical due to their large physical dimensions. They also must meet the ESR requirements over the full temperature range. In this regard, aluminium capacitors are at a big disadvantage due to their sharp ESR increase as temperature drops. For example, over a temperature drop from 20°C to –40°C, the ESR of an aluminum electrolytic capacitor can increase by a factor of 50. In addition, some of the electrolytes used in these capacitors can freeze at –25°C, making the capacitor nonoperational. 8 Submit Documentation Feedback Copyright © 2004–2016, Texas Instruments Incorporated Product Folder Links: LP2981-28 LP2981-29 LP2981-30 LP2981-33 LP2981-50 LP2981A-28 LP2981A-29 LP2981A30 LP2981A-33 LP2981A-50 LP2981-28, LP2981-29, LP2981-30 LP2981-33, LP2981-50, LP2981A-28 LP2981A-29, LP2981A-30, LP2981A-33, LP2981A-50 www.ti.com SLVS521G – JULY 2004 – REVISED AUGUST 2016 7.4 Device Functional Modes 7.4.1 ON/OFF Operation The LP2981 allows for a shutdown mode through the ON/OFF pin. If the shutdown feature is not used, ON/OFF must be connected to the input to ensure that the regulator is on at all times. To drive ON/OFF: • A LOW (≤0.3 V) turns the regulator OFF; a HIGH (≥1.6 V) turns it ON. – Use either a totem-pole output or an open-collector output with a pullup resistor tied to VIN (or another logic supply) • The HIGH signal can exceed VIN, but must not exceed the absolute maximum ratings of 20 V for the ON/OFF pin • Apply a signal with a slew rate of ≥40 mV/µs. A slow slew rate can cause the shutdown function to operate incorrectly 7.4.2 Reverse Input-Output Voltage An inherent diode is present across the PNP pass element of the LP2981. VIN VOUT Figure 2. Internal PNP Diode Structure With the anode connected to the output, this diode is reverse-biased during normal operation, because the input voltage is higher than the output. However, if the output is pulled one VBE higher than the input, or if the input is abruptly stepped below the output, this diode is forward-biased and can cause a parasitic silicon-controlled rectifier (SCR) to latch, resulting in current flowing from the output to the input (values in excess of 100 mA can cause damage). Thus, to prevent possible damage to the regulator in any application where the output may be pulled above the input, an external Schottky diode must be connected between the output and input. With the anode on output, this Schottky limits the reverse voltage across the output and input pins to approximately 0.3 V, preventing the regulator's internal diode from forward biasing. Schottky VOUT VIN LP2981 Copyright © 2016, Texas Instruments Incorporated Figure 3. Internal PNP Diode Bypass Copyright © 2004–2016, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: LP2981-28 LP2981-29 LP2981-30 LP2981-33 LP2981-50 LP2981A-28 LP2981A-29 LP2981A30 LP2981A-33 LP2981A-50 9 LP2981-28, LP2981-29, LP2981-30 LP2981-33, LP2981-50, LP2981A-28 LP2981A-29, LP2981A-30, LP2981A-33, LP2981A-50 SLVS521G – JULY 2004 – REVISED AUGUST 2016 www.ti.com 8 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 8.1 Application Information The LP2981 is a linear voltage regulator operating from 2.1 V to 16 V on the input and regulates voltages between 2.5 V to 5 V with 0.75% accuracy and 100-mA maximum output current. Efficiency is defined by the ratio of output voltage to input voltage because the LP2981 is a linear voltage regulator. To achieve high efficiency, the dropout voltage (VIN – VOUT) must be as small as possible, thus requiring a very-low-dropout LDO. Successfully implementing an LDO in an application depends on the application requirements. If the requirements are simply input voltage and output voltage, compliance specifications (such as internal power dissipation or stability) must be verified to ensure a solid design. If timing, start-up, noise, power supply rejection ratio (PSRR), or any other transient specification is required, then the design becomes more challenging. 8.2 Typical Application LP2981 VIN 1 VOUT 5 3.3 …F (see Note A) 1 …F (see Note A) GND ON/OFF (see Note B) 2 3 4 NC (see Note C) Copyright © 2016, Texas Instruments Incorporated A. Minimum COUT value for stability (can be increased without limit for improved stability and transient response) B. ON/OFF must be actively terminated. Connect to VIN if shutdown feature is not used. C. Pin 4 (NC) must be left open. Do not connect anything to this pin. Figure 4. LP2981 Typical Application 8.2.1 Design Requirements Table 1 lists the parameters for this application. Table 1. Design Parameters 10 PARAMETER DESIGN REQUIREMENT Input voltage 5 V ±10%, provided by an external regulator Output voltage 3.3 V ±5% Output current 100 mA (maximum), 1 mA (minimum) RMS noise, 300 Hz to 50kHz < 1 mVRMS PSRR at 1kHz > 40 dB Submit Documentation Feedback Copyright © 2004–2016, Texas Instruments Incorporated Product Folder Links: LP2981-28 LP2981-29 LP2981-30 LP2981-33 LP2981-50 LP2981A-28 LP2981A-29 LP2981A30 LP2981A-33 LP2981A-50 LP2981-28, LP2981-29, LP2981-30 LP2981-33, LP2981-50, LP2981A-28 LP2981A-29, LP2981A-30, LP2981A-33, LP2981A-50 www.ti.com SLVS521G – JULY 2004 – REVISED AUGUST 2016 8.2.2 Detailed Design Procedure 8.2.2.1 External Capacitors Like any low-dropout regulator, the external capacitors used with the LP2981 must be carefully selected to assure regulator loop stability. 8.2.2.1.1 Input Capacitor (Cin) A minimum value of 1 µF (over the entire operating temperature range) is required at the input of the LP2981. In addition, this input capacitor must be placed within 1 cm of the input pin and connected to a clean analog ground. There is no Equivalent Series Resistance (ESR) requirement for this capacitor, and the capacitance can be increased without limit. A good-quality ceramic or tantalum capacitor can be used. 8.2.2.1.2 Output Capacitor (Cout) As a PNP regulator, the LP2981 requires the output capacitor to meet both a minimum capacitance and ESR value. Required ESR values as a function of load current are provided for various output voltages, load currents, and capacitances (see Figure 5 through Figure 8). • Minimum Cout: 3.3 µF (can be increased without limit to improve transient response stability margin) • ESR range: see Figure 5 through Figure 8 It is critical that both the minimum capacitance and ESR requirement be met over the entire operating temperature range. Depending on the type of capacitor used, both of these parameters can vary significantly with temperature (see Capacitor Characteristics). 8.2.3 Application Curves Figure 5. 5-V/3.3-µF ESR Curves Figure 7. 3-V/3.3-µF ESR Curves Copyright © 2004–2016, Texas Instruments Incorporated Figure 6. 5-V/10-µF ESR Curves Figure 8. 3-V/10-µF ESR Curves Submit Documentation Feedback Product Folder Links: LP2981-28 LP2981-29 LP2981-30 LP2981-33 LP2981-50 LP2981A-28 LP2981A-29 LP2981A30 LP2981A-33 LP2981A-50 11 LP2981-28, LP2981-29, LP2981-30 LP2981-33, LP2981-50, LP2981A-28 LP2981A-29, LP2981A-30, LP2981A-33, LP2981A-50 SLVS521G – JULY 2004 – REVISED AUGUST 2016 www.ti.com 9 Power Supply Recommendations The LP2981 is designed to operate from an input voltage supply range between 2.2 V and 16 V. The input voltage range provides adequate headroom for the device to have a regulated output. This input supply must be well regulated. If the input supply is noisy, additional input capacitors with low ESR can help improve the output noise performance. 10 Layout 10.1 Layout Guidelines For best overall performance, place all circuit components on the same side of the printed-circuit board and as near as practical to the respective LDO pin connections. Place ground return connections to the input and output capacitors, and to the LDO ground pin as close to each other as possible, connected by a wide, component-side, copper surface. The use of vias and long traces to create LDO circuit connections is strongly discouraged and negatively affects system performance. This grounding and layout scheme minimizes inductive parasitics, and thereby reduces load-current transients, minimizes noise, and increases circuit stability. A ground reference plane is also recommended and is either embedded in the PCB itself or located on the bottom side of the PCB opposite the components. This reference plane serves to assure accuracy of the output voltage, shield noise, and behaves similar to a thermal plane to spread (or sink) heat from the LDO device. In most applications, this ground plane is necessary to meet thermal requirements. 10.2 Layout Example VIN IN VOUT OUT Input Capacitor GND ON/OFF ON/OFF Output Capacitor LP2981 NC Figure 9. Recommended Layout 12 Submit Documentation Feedback Copyright © 2004–2016, Texas Instruments Incorporated Product Folder Links: LP2981-28 LP2981-29 LP2981-30 LP2981-33 LP2981-50 LP2981A-28 LP2981A-29 LP2981A30 LP2981A-33 LP2981A-50 LP2981-28, LP2981-29, LP2981-30 LP2981-33, LP2981-50, LP2981A-28 LP2981A-29, LP2981A-30, LP2981A-33, LP2981A-50 www.ti.com SLVS521G – JULY 2004 – REVISED AUGUST 2016 11 Device and Documentation Support 11.1 Related Links The table below lists quick access links. Categories include technical documents, support and community resources, tools and software, and quick access to sample or buy. Table 2. Related Links PARTS PRODUCT FOLDER SAMPLE & BUY TECHNICAL DOCUMENTS TOOLS & SOFTWARE SUPPORT & COMMUNITY LP2981-28 Click here Click here Click here Click here Click here LP2981-29 Click here Click here Click here Click here Click here LP2981-30 Click here Click here Click here Click here Click here LP2981-33 Click here Click here Click here Click here Click here LP2981-33 Click here Click here Click here Click here Click here LP2981-50 Click here Click here Click here Click here Click here LP2981A-28 Click here Click here Click here Click here Click here LP2981A-29 Click here Click here Click here Click here Click here LP2981A-30 Click here Click here Click here Click here Click here LP2981A-33 Click here Click here Click here Click here Click here LP2981A-50 Click here Click here Click here Click here Click here 11.2 Receiving Notification of Documentation Updates To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper right corner, click on Alert me to register and receive a weekly digest of any product information that has changed. For change details, review the revision history included in any revised document. 11.3 Community Resources The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use. TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help solve problems with fellow engineers. Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and contact information for technical support. 11.4 Trademarks E2E is a trademark of Texas Instruments. All other trademarks are the property of their respective owners. 11.5 Electrostatic Discharge Caution This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. 11.6 Glossary SLYZ022 — TI Glossary. This glossary lists and explains terms, acronyms, and definitions. Copyright © 2004–2016, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: LP2981-28 LP2981-29 LP2981-30 LP2981-33 LP2981-50 LP2981A-28 LP2981A-29 LP2981A30 LP2981A-33 LP2981A-50 13 LP2981-28, LP2981-29, LP2981-30 LP2981-33, LP2981-50, LP2981A-28 LP2981A-29, LP2981A-30, LP2981A-33, LP2981A-50 SLVS521G – JULY 2004 – REVISED AUGUST 2016 www.ti.com 12 Mechanical, Packaging, and Orderable Information The following pages include mechanical, packaging, and orderable information. This information is the most current data available for the designated devices. This data is subject to change without notice and revision of this document. For browser-based versions of this data sheet, refer to the left-hand navigation. 14 Submit Documentation Feedback Copyright © 2004–2016, Texas Instruments Incorporated Product Folder Links: LP2981-28 LP2981-29 LP2981-30 LP2981-33 LP2981-50 LP2981A-28 LP2981A-29 LP2981A30 LP2981A-33 LP2981A-50 PACKAGE OPTION ADDENDUM www.ti.com 15-Apr-2017 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) LP2981-28DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU | CU SN Level-1-260C-UNLIM -40 to 125 (LP5G ~ LP5L) LP2981-28DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU | CU SN Level-1-260C-UNLIM -40 to 125 (LP5G ~ LP5L) LP2981-28DBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 LP5G LP2981-29DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 (LP3G ~ LP3L) LP2981-30DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU | CU SN Level-1-260C-UNLIM -40 to 125 (LP7G ~ LP7L) LP2981-30DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU | CU SN Level-1-260C-UNLIM -40 to 125 (LP7G ~ LP7L) LP2981-33DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU | CU SN Level-1-260C-UNLIM -40 to 125 (LPBG ~ LPBL) LP2981-33DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU | CU SN Level-1-260C-UNLIM -40 to 125 (LPBG ~ LPBL) LP2981-33DBVTE4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 LPBG LP2981-33DBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 LPBG LP2981-50DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 (LPDG ~ LPDL) LP2981-50DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 (LPDG ~ LPDL) LP2981-50DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 (LPDG ~ LPDL) LP2981-50DBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 (LPDG ~ LPDL) LP2981A-28DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU | CU SN Level-1-260C-UNLIM -40 to 125 (LP6G ~ LP6L) LP2981A-28DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU | CU SN Level-1-260C-UNLIM -40 to 125 (LP6G ~ LP6L) LP2981A-29DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 (LRBG ~ LRBL) Addendum-Page 1 Samples PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 15-Apr-2017 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) LP2981A-29DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 (LRBG ~ LRBL) LP2981A-30DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU | CU SN Level-1-260C-UNLIM -40 to 125 (LP8G ~ LP8L) LP2981A-30DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 LP8G LP2981A-30DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU | CU SN Level-1-260C-UNLIM -40 to 125 (LP8G ~ LP8L) LP2981A-30DBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 LP8G LP2981A-33DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU | CU SN Level-1-260C-UNLIM -40 to 125 (LPCG ~ LPCL) LP2981A-33DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 LPCG LP2981A-33DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU | CU SN Level-1-260C-UNLIM -40 to 125 (LPCG ~ LPCL) LP2981A-33DBVTE4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 LPCG LP2981A-33DBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 LPCG LP2981A-50DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 (LPEG ~ LPEL) LP2981A-50DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 (LPEG ~ LPEL) LP2981A-50DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 (LPEG ~ LPEL) LP2981A-50DBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 (LPEG ~ LPEL) (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. Addendum-Page 2 Samples PACKAGE OPTION ADDENDUM www.ti.com 15-Apr-2017 (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. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (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. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. 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. Addendum-Page 3 PACKAGE MATERIALS INFORMATION www.ti.com 25-Apr-2017 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) LP2981-28DBVR SOT-23 DBV 5 3000 178.0 9.0 LP2981-28DBVTG4 SOT-23 DBV 5 250 178.0 LP2981-30DBVR SOT-23 DBV 5 3000 178.0 LP2981-33DBVR SOT-23 DBV 5 3000 LP2981-33DBVTG4 SOT-23 DBV 5 LP2981A-28DBVR SOT-23 DBV LP2981A-30DBVR SOT-23 DBV LP2981A-30DBVRG4 SOT-23 LP2981A-30DBVTG4 LP2981A-33DBVR 3.23 3.17 1.37 4.0 8.0 Q3 9.0 3.23 3.17 1.37 4.0 8.0 Q3 9.0 3.23 3.17 1.37 4.0 8.0 Q3 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3 250 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3 5 3000 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3 5 3000 178.0 9.0 3.3 3.2 1.4 4.0 8.0 Q3 DBV 5 3000 178.0 9.0 3.3 3.2 1.4 4.0 8.0 Q3 SOT-23 DBV 5 250 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3 SOT-23 DBV 5 3000 178.0 9.0 3.3 3.2 1.4 4.0 8.0 Q3 LP2981A-33DBVRG4 SOT-23 DBV 5 3000 178.0 9.0 3.3 3.2 1.4 4.0 8.0 Q3 LP2981A-33DBVT SOT-23 DBV 5 250 180.0 9.2 3.17 3.23 1.37 4.0 8.0 Q3 LP2981A-33DBVTG4 SOT-23 DBV 5 250 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3 Pack Materials-Page 1 W Pin1 (mm) Quadrant PACKAGE MATERIALS INFORMATION www.ti.com 25-Apr-2017 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LP2981-28DBVR SOT-23 DBV 5 3000 180.0 180.0 18.0 LP2981-28DBVTG4 SOT-23 DBV 5 250 180.0 180.0 18.0 LP2981-30DBVR SOT-23 DBV 5 3000 180.0 180.0 18.0 LP2981-33DBVR SOT-23 DBV 5 3000 180.0 180.0 18.0 LP2981-33DBVTG4 SOT-23 DBV 5 250 180.0 180.0 18.0 LP2981A-28DBVR SOT-23 DBV 5 3000 180.0 180.0 18.0 LP2981A-30DBVR SOT-23 DBV 5 3000 180.0 180.0 18.0 LP2981A-30DBVRG4 SOT-23 DBV 5 3000 180.0 180.0 18.0 LP2981A-30DBVTG4 SOT-23 DBV 5 250 180.0 180.0 18.0 LP2981A-33DBVR SOT-23 DBV 5 3000 180.0 180.0 18.0 LP2981A-33DBVRG4 SOT-23 DBV 5 3000 180.0 180.0 18.0 LP2981A-33DBVT SOT-23 DBV 5 250 205.0 200.0 33.0 LP2981A-33DBVTG4 SOT-23 DBV 5 250 180.0 180.0 18.0 Pack Materials-Page 2 IMPORTANT NOTICE Texas Instruments Incorporated (TI) reserves 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. 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