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LP2985A-30DBVTG4

LP2985A-30DBVTG4

  • 厂商:

    BURR-BROWN(德州仪器)

  • 封装:

    SOT23-5

  • 描述:

    IC REG LDO 3V 0.15A SOT23-5

  • 数据手册
  • 价格&库存
LP2985A-30DBVTG4 数据手册
LP2985 SLVS522P – JULY 2004 – REVISED FEBRUARY 2022 LP2985 150-mA, Low-Noise, Low-Dropout Regulator With Shutdown 1 Features 3 Description • The LP2985 family of fixed-output, low-dropout regulators offers exceptional, cost-effective performance for both portable and nonportable applications. Available in voltages of 1.8 V, 2.5 V, 2.8 V, 2.9 V, 3 V, 3.1 V, 3.3 V, 5 V, and 10 V, the family has an output tolerance of 1% for the A version (1.5% for the non-A version) and is capable of delivering 150-mA continuous load current. Standard regulator features, such as overcurrent and overtemperature protection, are included. • • • • • • • • • Output tolerance of: – 1% (A grade) – 1.5% (standard grade) Ultra-low dropout, typically: – 280 mV at full load of 150 mA – 7 mV at 1 mA Wide VIN range: 16 V max Low IQ: 850 μA at full load at 150 mA Shutdown current: 0.01 μA typ Low noise: 30 μVRMS with 10-nF bypass capacitor Stable with low-ESR capacitors, including ceramic Overcurrent and thermal protection High peak-current capability ESD protection exceeds JESD 22 : – 2000-V human-body model (A114-A) – 200-V machine model (A115-A) Device Information(1) PART NUMBER LP2985 (1) PACKAGE SOT-23 (5) BODY SIZE (NOM) 2.90 mm × 1.60 mm For all available packages, see the orderable addendum at the end of the data sheet. 2 Applications • • • • Washer and dryer Land mobile radio Active antenna system mMIMO Cordless power tool Dropout Voltage vs Temperature 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. LP2985 www.ti.com SLVS522P – JULY 2004 – REVISED FEBRUARY 2022 Table of Contents 1 Features............................................................................1 2 Applications..................................................................... 1 3 Description.......................................................................1 4 Revision History.............................................................. 2 5 Pin Configuration and Functions...................................3 6 Specifications.................................................................. 4 6.1 Absolute Maximum Ratings........................................ 4 6.2 ESD Ratings............................................................... 4 6.3 Recommended Operating Conditions.........................4 6.4 Thermal Information....................................................4 6.5 Electrical Characteristics.............................................5 6.6 Typical Characteristics................................................ 7 7 Detailed Description...................................................... 11 7.1 Overview................................................................... 11 7.2 Functional Block Diagram......................................... 11 7.3 Feature Description...................................................11 7.4 Device Functional Modes..........................................11 8 Application and Implementation.................................. 13 8.1 Application Information............................................. 13 8.2 Typical Application.................................................... 15 9 Power Supply Recommendations................................18 10 Layout...........................................................................18 10.1 Layout Guidelines................................................... 18 10.2 Layout Example...................................................... 18 11 Device and Documentation Support..........................19 11.1 Receiving Notification of Documentation Updates.. 19 11.2 Support Resources................................................. 19 11.3 Trademarks............................................................. 19 11.4 Electrostatic Discharge Caution.............................. 19 11.5 Glossary.................................................................. 19 12 Mechanical, Packaging, and Orderable Information.................................................................... 19 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision O (January 2015) to Revision P (February 2022) Page • Changed Applications section............................................................................................................................ 1 • Changed Thermal Information table: changed RθJA value from 206°C/W to 205.4°C/W and added RθJC(top), RθJB, ΨJT, and ΨJB rows.....................................................................................................................................4 • Changed Application Information section......................................................................................................... 13 • Changed Typical Application section to follow current standards.....................................................................15 Changes from Revision N (June 2011) to Revision O (January 2015) Page • Added Applications, Device Information table, Pin Functions table, ESD Ratings table, Thermal Information 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 • Deleted Ordering Information table.....................................................................................................................1 2 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: LP2985 LP2985 www.ti.com SLVS522P – JULY 2004 – REVISED FEBRUARY 2022 5 Pin Configuration and Functions DBV (SOT-23) PACKAGE (TOP VIEW) VIN GND ON/OFF 1 5 VOUT 4 BYPASS 2 3 Table 5-1. Pin Functions PIN NAME NO. TYPE DESCRIPTION BYPASS 4 I/O Attach a 10-nF capacitor to improve low-noise performance. GND 2 — Ground ON/OFF 3 I Active-low shutdown pin. Tie to VIN if unused. VIN 1 I Supply input VOUT 5 O Voltage output Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: LP2985 3 LP2985 www.ti.com SLVS522P – JULY 2004 – REVISED FEBRUARY 2022 6 Specifications 6.1 Absolute Maximum Ratings over virtual junction temperature range (unless otherwise noted)(1) MIN MAX VIN Continuous input voltage range(3) –0.3 16 V VON/OFF ON/OFF input voltage range –0.3 16 V Output voltage range(2) –0.3 9 V Internally limited (short-circuit protected) IO Output current(4) RθJA Package thermal impedance(4) (5) TJ Operating virtual junction temperature Tstg Storage temperature range (1) (2) (3) (4) (5) –65 UNIT — 206 °C/W 150 °C 150 °C Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. If load is returned to a negative power supply in a dual-supply system, the output must be diode clamped to GND. 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 the Application and Implementation section for more details). 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. 6.2 ESD Ratings VALUE V(ESD) (1) (2) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins(1) 2000 Charged device model (CDM), per JEDEC specification JESD22-C101, all pins(2) 1000 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. 6.3 Recommended Operating Conditions VIN Supply input voltage VON/OFF ON/OFF input voltage IOUT Output current TJ Virtual junction temperature (1) MIN MAX 2.2(1) 16 0 –40 UNIT V VIN V 150 mA 125 °C Recommended minimum VIN is the greater of 2.5 V or VOUT(max) + rated dropout voltage (max) for operating IL. 6.4 Thermal Information LP2985 THERMAL METRIC(1) DBV UNIT 5 PINS RθJA Junction-to-ambient thermal resistance 205.4 °C/W RθJC(top) Junction-to-case (top) thermal resistance 78.8 °C/W RθJB Junction-to-board thermal resistance 46.7 °C/W ΨJT Junction-to-top characterization parameter 8.3 °C/W ΨJB Junction-to-board characterization parameter 46.3 °C/W (1) 4 For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report. Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: LP2985 LP2985 www.ti.com SLVS522P – JULY 2004 – REVISED FEBRUARY 2022 6.5 Electrical Characteristics at specified virtual junction temperature range, VIN = VOUT(NOM) + 1 V, VON/OFF = 2 V, CIN = 1 μF, and IL = 1 mA, COUT = 4.7 μF (unless otherwise noted) PARAMETER TEST CONDITIONS IL = 1 mA ΔVOUT Output voltage tolerance 1 mA ≤ IL ≤ 50 mA 1 mA ≤ IL ≤ 150 mA Line regulation VIN = [VOUT(NOM) + 1 V] to 16 V LP2985A-xx MIN TYP 1 –1.5 1.5 1.5 –2.5 2.5 –40°C to 125°C –2.5 2.5 –3.5 3.5 25°C –2.5 2.5 –3 3 –40°C to 125°C –3.5 3.5 –4 25°C 0.007 –40°C to 125°C 1 7 120 –40°C to 125°C 280 –40°C to 125°C 65 75 120 VON/OFF VON/OFF = LOW → output OFF VON/OFF = 0 V ION/OFF ON/OFF input current VON/OFF = 5 V 225 350 280 350 575 95 65 95 110 75 110 140 140 170 170 220 120 220 25°C (LP2985-10) 250 250 –40°C to 125°C 400 400 350 600 350 650 1800 –40°C to 125°C 2500 600 1000 1500 25°C (LP2985-10) 850 1500 1800 2500 25°C 0.01 0.8 0.01 0.8 –40°C to 105°C 0.05 2 0.05 2 5 25°C –40°C to 125°C 25°C 25°C –40°C to 125°C 1.4 1.6 1.6 0.55 V 0.55 0.15 0.01 –40°C to 125°C 25°C 5 1.4 –40°C to 125°C μA 650 1000 850 mV 150 160 –40°C to 125°C VON/OFF = HIGH → output ON 120 160 25°C ON/OFF input voltage(2) 150 125 –40°C to 125°C VON/OFF < 0.15 V (OFF) 90 125 25°C VON/OFF < 0.3 V (OFF) 60 –40°C to 125°C (LP2985-10) 25°C (LP2985-10) IL = 150 mA 40 –40°C to 125°C 25°C IL = 50 mA 15 60 125 –40°C to 125°C GND pin current 10 125 25°C (LP2985-10) %/V 3 25°C (LP2985-10) 25°C IGND 7 575 25°C IL = 10 mA 10 225 25°C %VNOM 5 90 25°C IL = 1 mA 1 15 40 0.014 0.032 3 UNIT 4 0.007 5 –40°C to 125°C IL = 0 mA 0.014 0.032 25°C IL = 150 mA MAX –1 25°C IL = 50 mA TYP –1.5 –40°C to 125°C IL = 10 mA MIN 25°C –40°C to 125°C IL = 1 mA LP2985-xx MAX 25°C 25°C IL = 0 VIN – VOUT Dropout voltage(1) TJ 0.15 0.01 –2 5 –2 5 15 μA 15 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: LP2985 5 LP2985 www.ti.com SLVS522P – JULY 2004 – REVISED FEBRUARY 2022 6.5 Electrical Characteristics (continued) at specified virtual junction temperature range, VIN = VOUT(NOM) + 1 V, VON/OFF = 2 V, CIN = 1 μF, and IL = 1 mA, COUT = 4.7 μF (unless otherwise noted) PARAMETER TJ LP2985A-xx MIN TYP LP2985-xx MAX MIN TYP MAX UNIT Vn Output noise (RMS) BW = 300 Hz to 50 kHz, COUT = 10 μF, CBYPASS = 10 nF 25°C 30 30 μV ΔVOUT/ ΔVIN Ripple rejection f = 1kHz, COUT = 10 μF, CBYPASS = 10 nF 25°C 45 45 dB IOUT(PK) Peak output current VOUT ≥ VO(NOM) – 5% 25°C 350 350 mA 25°C 400 400 mA IOUT(SC) (1) (2) (3) 6 TEST CONDITIONS Short-circuit current RL = 0 (steady state)(3) 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. The ON/OFF input must be driven properly for reliable operation (see the Application and Implementation section). See Figure 6-6 in the Typical Characteristics section. Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: LP2985 LP2985 www.ti.com SLVS522P – JULY 2004 – REVISED FEBRUARY 2022 6.6 Typical Characteristics CIN = 1 μF, COUT = 4.7 μF, VIN = VOUT(NOM) + 1 V, TA = 25°C, and ON/OFF pin tied to VIN (unless otherwise specified) 3.345 10.20 VI = 4.3 V VO = 3.3 V Ci = 1 mF Co = 4.7 mF IO = 1 mA VI = 11 V 10.15 VO = 10 V 10.10 3.335 CO = 4.7 µF Output Voltage − (V) Output Voltage – V CI = 1 µF IO = 1 mA 10.05 10.00 9.95 3.315 3.305 9.90 9.85 -50 3.325 -25 0 25 50 75 100 125 150 3.295 −50 −25 0 Temperature – °C 25 50 75 100 125 150 Temperature − (°C) Figure 6-1. Output Voltage vs Temperature Figure 6-2. Output Voltage vs Temperature 0.5 Short-Circuit Current − (A) 0.45 0.4 VI = 6 V VO = 3.3 V Ci = 1 mF Cbyp = 0.01 mF 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 −500 0 500 1000 Time − (ms) 1500 2000 Figure 6-4. Short-Circuit Current vs Time Figure 6-3. Dropout Voltage vs Temperature Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: LP2985 7 LP2985 www.ti.com SLVS522P – JULY 2004 – REVISED FEBRUARY 2022 6.6 Typical Characteristics (continued) CIN = 1 μF, COUT = 4.7 μF, VIN = VOUT(NOM) + 1 V, TA = 25°C, and ON/OFF pin tied to VIN (unless otherwise specified) 0.5 0.4 VO = 3.3 V 300 0.35 ISC − (mA) Short-Circuit Current − (A) 320 VI = 16 V VO = 3.3 V Ci = 1 mF Cbyp = 0.01 mF 0.45 0.3 0.25 280 260 0.2 240 0.15 0.1 220 0.05 0 −100 100 300 500 Time − (ms) 200 700 0 Figure 6-5. Short-Circuit Current vs Time 1.5 2 2.5 Output Voltage − (V) 3 3.5 100 VO = 3.3 V Cbyp = 10 nF 1100 VI = 5 V VO = 3.3 V Co = 10 mF Cbyp = 0 nF 90 1000 Ripple Rejection − (dB) 80 900 Ground Pin Current − mA 1 Figure 6-6. Short-Circuit Current vs Output Voltage 1200 800 700 600 500 400 70 50 mA 1 mA 60 50 40 150 mA 30 300 20 200 10 100 0 0 20 0 40 60 80 100 Load Current − mA 120 160 140 10 100k 1M VI = 5 V VO = 3.3 V Co = 4.7 mF Cbyp = 10 nF 90 80 Ripple Rejection − (dB) 80 Ripple Rejection − (dB) 10k 100 VI = 3.7 V VO = 3.3 V Co = 10 mF Cbyp = 0 nF 90 70 1 mA 60 50 mA 40 30 1k Figure 6-8. Ripple Rejection vs Frequency 100 50 100 Frequency − (Hz) Figure 6-7. Ground Pin Current vs Load Current 150 mA 70 60 1 mA 50 40 50 mA 30 20 20 10 10 0 150 mA 0 10 100 1k 10k 100k 1M 10 Frequency − (Hz) 100 1k 10k 100k 1M Frequency − (Hz) Figure 6-9. Ripple Rejection vs Frequency 8 0.5 Figure 6-10. Ripple Rejection vs Frequency Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: LP2985 LP2985 www.ti.com SLVS522P – JULY 2004 – REVISED FEBRUARY 2022 6.6 Typical Characteristics (continued) CIN = 1 μF, COUT = 4.7 μF, VIN = VOUT(NOM) + 1 V, TA = 25°C, and ON/OFF pin tied to VIN (unless otherwise specified) 100 10 Ripple Rejection − (dB) 80 70 Output Impedance − (W) VI = 5 V VO = 3.3 V Co = 4.7 mF Cbyp = 10 nF 90 1 mA 60 10 mA 50 40 100 mA 30 Ci = 1 mF Co = 10 mF VO = 3.3 V 1 1 mA 10 mA 100 mA 0.1 0.01 20 10 0 10 100 1k 10k Frequency − (Hz) 100k Noise Density − (mV/ Hz) Output Impedance − (W) 100k 1M ILOAD = 150 mA 10 mA 100 mA 0.1 0.01 1 Cbyp = 100 pF Cbyp = 1 nF 0.1 Cbyp = 10 nF 0.01 100 1k 10k 100k 100 1M 1k 10k 100k Frequency − (Hz) Frequency − (Hz) Figure 6-13. Output Impedance vs Frequency Figure 6-14. Output Noise Density vs Frequency 1.8 10 ILOAD = 1 mA VO = 3.3 V Cbyp = 10 nF 1.6 RL = 3.3 kW 1.4 1 Input Current − (mA) Noise Density − (mV/ Hz) 10k 10 1 mA 0.001 10 1k Figure 6-12. Output Impedance vs Frequency Ci = 1 mF Co = 4.7 mF VO = 3.3 V 1 100 Frequency − (Hz) Figure 6-11. Ripple Rejection vs Frequency 10 0.001 10 1M Cbyp = 100 pF Cbyp = 1 nF 0.1 1.2 1 0.8 RL = Open 0.6 Cbyp = 10 nF 0.4 0.2 0.01 0 100 1k 10k Frequency − (Hz) 100k 0 1 2 3 4 5 6 Input Voltage − (V) Figure 6-15. Output Noise Density vs Frequency Figure 6-16. Input Current vs Input Voltage Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: LP2985 9 LP2985 www.ti.com SLVS522P – JULY 2004 – REVISED FEBRUARY 2022 6.6 Typical Characteristics (continued) CIN = 1 μF, COUT = 4.7 μF, VIN = VOUT(NOM) + 1 V, TA = 25°C, and ON/OFF pin tied to VIN (unless otherwise specified) 1400 Ground Current − (C) 1200 VO = 3.3 V Cbyp = 10 nF 150 mA 1000 800 600 1 mA 400 50 mA 0 mA 200 10 mA 0 −50 −25 0 25 50 75 100 125 150 Temperature − (°C) Figure 6-17. Ground-Pin Current vs Temperature Figure 6-18. 2.2-μF Stable ESR Range for Output Voltage ≤ 2.3 V Figure 6-19. 4.7-μF Stable ESR Range for Output Voltage ≤ 2.3 V Figure 6-20. 2.2-μF, 3.3-μF Stable ESR Range for Output Voltage ≥ 2.5 V 10 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: LP2985 LP2985 www.ti.com SLVS522P – JULY 2004 – REVISED FEBRUARY 2022 7 Detailed Description 7.1 Overview The LP2985 family of fixed-output, low-dropout regulators offers exceptional, cost-effective performance for both portable and nonportable applications. Available in voltages of 1.8 V, 2.5 V, 2.8 V, 2.9 V, 3 V, 3.1 V, 3.3 V, 5 V, and 10 V, the family has an output tolerance of 1% for the A version (1.5% for the non-A version) and is capable of delivering 150-mA continuous load current. Standard regulator features, such as overcurrent and overtemperature protection, are included. 7.2 Functional Block Diagram 7.3 Feature Description The LP2985 has a host of features that makes the regulator an ideal candidate for a variety of portable applications: • • • • • • Low dropout: A PNP pass element allows a typical dropout of 280 mV at 150-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. Low-ESR-capacitor friendly: The regulator is stable with low-ESR capacitors, allowing the use of small, inexpensive, ceramic capacitors in cost-sensitive applications. Low noise: A BYPASS pin allows for low-noise operation, with a typical output noise of 30 μVRMS, with the use of a 10-nF bypass capacitor. Small packaging: For the most space-constrained needs, the regulator is available in the SOT-23 package. 7.4 Device Functional Modes 7.4.1 Normal Operation In normal operation, the device will output a fixed voltage corresponding with the orderable part number. The device can deliver 150 mA of continuous load current. Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: LP2985 11 LP2985 www.ti.com SLVS522P – JULY 2004 – REVISED FEBRUARY 2022 7.4.2 Shutdown Mode Set the ON/OFF pin low to shut down the device when VIN is still present. If a shutdown mode is not needed, tie the pin to VIN. For proper operation, do not leave ON/OFF unconnected, and apply a signal with a slew rate of ≥ 40 mV/μs. 12 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: LP2985 LP2985 www.ti.com SLVS522P – JULY 2004 – REVISED FEBRUARY 2022 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, as well as validating and testing their design implementation to confirm system functionality. 8.1 Application Information 8.1.1 Capacitors 8.1.1.1 Input Capacitor (CIN) A minimum value of 1 μF (over the entire operating temperature range) is required at the input of the LP2985. In addition, this input capacitor must be located within 1 cm of the input pin and connected to a clean analog ground. There are no equivalent series resistance (ESR) requirements for this capacitor, and the capacitance can be increased without limit. 8.1.1.2 Output Capacitor (COUT) As an advantage over other regulators, the LP2985 permits the use of low-ESR capacitors at the output, including ceramic capacitors that can have an ESR as low as 5 mΩ. Tantalum and film capacitors also can be used if size and cost are not issues. The output capacitor must be located within 1 cm of the output pin and be returned to a clean analog ground. As with other PNP LDOs, stability conditions require the output capacitor to have a minimum capacitance and an ESR that falls within a certain range. • • Minimum COUT: 2.2 μF (can be increased without limit to improve transient response stability margin) ESR range: see Figure 6-18 through Figure 6-20 Both the minimum capacitance and ESR requirement are critical to be met over the entire operating temperature range. Depending on the type of capacitors used, both these parameters can vary significantly with temperature (see the Capacitor Characteristics section). 8.1.1.3 Noise Bypass Capacitor (CBYPASS) The LP2985 allows for low-noise performance with the use of a bypass capacitor that is connected to the internal band-gap reference via the BYPASS pin. This high-impedance band-gap circuitry is biased in the microampere range and, thus, cannot be loaded significantly, otherwise, its output (and, correspondingly, the output of the regulator) changes. Thus, for best output accuracy, dc leakage current through CBYPASS must be minimized as much as possible and must never exceed 100 nA. A 10-nF capacitor is recommended for CBYPASS. Ceramic and film capacitors are well suited for this purpose. 8.1.1.4 Capacitor Characteristics 8.1.1.4.1 Ceramics Ceramic capacitors are ideal choices for use on the output of the LP2985 for several reasons. For capacitances in the range of 2.2 μF to 4.7 μF, ceramic capacitors have the lowest cost and the lowest ESR, making them choice candidates for filtering high-frequency noise. For instance, a typical 2.2-μF ceramic capacitor has an ESR in the range of 10 mΩ to 20 mΩ and, thus, satisfies minimum ESR requirements of the regulator. Ceramic capacitors have one major disadvantage that must be taken into account—a poor temperature coefficient, where the capacitance can vary significantly with temperature. For instance, a large-value ceramic capacitor (≥ 2.2 μF) can lose more than half of its capacitance as the temperature rises from 25°C to 85°C. Thus, a 2.2-μF capacitor at 25°C drops well below the minimum COUT required for stability, as ambient temperature rises. For this reason, select an output capacitor that maintains the minimum 2.2 μF required for Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: LP2985 13 LP2985 www.ti.com SLVS522P – JULY 2004 – REVISED FEBRUARY 2022 stability over the entire operating temperature range. There are some ceramic capacitors that can maintain a ±15% capacitance tolerance over temperature. 8.1.1.4.2 Tantalum Tantalum capacitors can be used at the output of the LP2985, but there are significant disadvantages that can prohibit their use: • • • In the 1-μF to 4.7-μF range, tantalum capacitors are more expensive than ceramics of the equivalent capacitance and voltage ratings. Tantalum capacitors have higher ESRs than their equivalent-sized ceramic counterparts. Thus, to meet the ESR requirements, a higher-capacitance tantalum may be required, at the expense of larger size and higher cost. The ESR of a tantalum capacitor increases as temperature drops, as much as double from +25°C to –40°C. Thus, ESR margins must be maintained over the temperature range to prevent regulator instability. 8.1.2 Reverse Input-Output Voltage As shown in Figure 8-1, there is an inherent diode present across the PNP pass element of the LP2985. VIN VOUT Figure 8-1. Inherent PNP Body Diode With the anode connected to the output, this diode is reverse biased during normal operation, since the input voltage is higher than the output. However, if the output is pulled higher than the input for any reason, this diode is forward biased and can cause a parasitic silicon-controlled rectifier (SCR) to latch, resulting in high current flowing from the output to the input. Thus, to prevent possible damage to the regulator in any application where the output may be pulled above the input, or the input may be shorted to ground, connect an external Schottky diode between the output and input. With the anode on the output, this Schottky diode limits the reverse voltage across the output and input pins to approximately 0.3 V (as shown in Figure 8-2), preventing the regulator internal diode from forward biasing. Schottky VIN VOUT LP2985 Figure 8-2. External Schottky Diode to Prevent Reverse Current Through the Device 14 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: LP2985 LP2985 www.ti.com SLVS522P – JULY 2004 – REVISED FEBRUARY 2022 8.2 Typical Application Figure 8-3 shows the standard usage of the LP2985 as a low-dropout regulator. LP2985 VIN 1 VOUT 5 2.2 µF 1 µF GND ON/OFF 2 3 4 BYPASS 10 nF Figure 8-3. LP2985 Typical Application 8.2.1 Design Requirements Minimum COUT value for stability (can be increased without limit for improved stability and transient response) ON/OFF must be actively terminated. Connect to VIN if shutdown feature is not used. Optional BYPASS capacitor for low-noise operation. 8.2.2 Detailed Design Procedure 8.2.2.1 ON/OFF Operation The LP2985 allows for a shutdown mode via the ON/OFF pin. Driving the pin LOW (≤ 0.3 V) turns the device OFF; conversely, a HIGH (≥ 1.6 V) turns the device ON. If the shutdown feature is not used, connect ON/OFF to the input to ensure that the regulator is on at all times. For proper operation, do not leave ON/OFF unconnected, and apply a signal with a slew rate of ≥ 40 mV/μs. Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: LP2985 15 LP2985 www.ti.com SLVS522P – JULY 2004 – REVISED FEBRUARY 2022 3.4 200 3.38 150 3.38 150 3.36 100 3.36 100 3.3 0 −50 VO 3.28 −100 3.26 −150 3.24 −200 −250 3.22 IL 3.34 3.32 3.3 VO = 3.3 V Cbyp = 10 nF DIL = 150 mA 3.4 200 3.38 150 3.36 100 3.28 −100 3.26 −150 3.24 −200 3.22 −250 Figure 8-5. Load Transient Response 3.41 5.5 3.39 5 VI VO = 3.3 V Cbyp = 0 nF DIL = 150 mA 0 −50 VO 3.28 −100 3.26 −150 3.24 −200 Output Voltage − (V) 50 IL Load Current − (mA) Output Voltage − (V) 3.37 3.3 −50 20 ms/div→ Figure 8-4. Load Transient Response 3.32 0 VO 20 ms/div→ 3.34 50 3.35 4.5 VO = 3.3 V Cbyp = 0 nF IO = 150 mA 4 3.5 3.33 3.31 VO 3 2.5 3.29 3.27 −250 3.22 2 20 ms/div→ 20 ms/div→ Figure 8-7. Line Transient Response 5.5 3.41 5.5 3.39 5 3.39 5 4.5 3.37 VI 3.35 VO = 3.3 V Cbyp = 10 nF IO = 150 mA 4 3.33 3.5 3.31 3.29 VO 3.27 Output Voltage − (V) 3.41 Input Voltage − (V) Output Voltage − (V) Figure 8-6. Load Transient Response 3.37 3.35 VI VO = 3.3 V Cbyp = 0 nF IO = 1 mA 4.5 4 3.33 3.5 3 3.31 3 2.5 3.29 2.5 VO 2 3.27 2 20 ms/div→ 20 ms/div→ Figure 8-8. Line Transient Response 16 Input Voltage − (V) 3.32 50 IL VO = 3.3 V Cbyp = 10 nF DIL = 100 mA Input Voltage − (V) 3.34 Load Current − (mA) 200 Output Voltage − (V) 3.4 Load Current − (mA) Output Voltage − (V) 8.2.3 Application Curves Figure 8-9. Line Transient Response Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: LP2985 LP2985 www.ti.com SLVS522P – JULY 2004 – REVISED FEBRUARY 2022 5.5 3.41 4 10 VO 3 5 3.39 8 3.5 3.31 3 VO 1 6 0 VO = 3.3 V Cbyp = 0 IO = 150 mA −1 4 −2 VON/OFF 3.29 3.27 2.5 −3 2 −4 0 100 ms/div→ 100 ms/div→ Figure 8-10. Line Transient Response Figure 8-11. Turn-On Time 10 4 2 10 4 VO VO 3 3 8 8 2 6 0 −1 VO = 3.3 V Cbyp = 100 pF ILOAD = 150 mA 4 −2 VON/OFF Output Voltage − (V) 1 VON/OFF − (V) Output Voltage − (V) 2 1 6 0 VO = 3.3 V Cbyp = 1 nF ILOAD = 150 mA −1 4 VON/OFF − (V) 3.33 VO = 3.3 V Cbyp = 10 nF IO = 1 mA VON/OFF − (V) 4 3.35 2 Output Voltage − (V) Output Voltage − (V) 4.5 Input Voltage − (V) VIN 3.37 VON/OFF −2 2 2 −3 −3 0 −4 0 −4 2 ms/div→ 200 ms/div→ Figure 8-13. Turn-On Time Figure 8-12. Turn-On Time 4 Input 10 3 8 1 6 0 −1 4 VO = 3.3 V Cbyp = 10 nF ILOAD = 150 mA VON/OFF − (V) Output Voltage − (V) 2 Output −2 2 −3 0 −4 20 ms/div→ Figure 8-14. Turn-On Time Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: LP2985 17 LP2985 www.ti.com SLVS522P – JULY 2004 – REVISED FEBRUARY 2022 9 Power Supply Recommendations A power supply can be used at the input voltage within the ranges given in the Recommended Operating Conditions table. Use bypass capacitors as described in the Layout Guidelines section. 10 Layout 10.1 Layout Guidelines • • • Bypass the input pin to ground with a bypass-capacitor. The optimum placement of the bypass capacitor is closest to the VIN of the device and GND of the system. Care must be taken to minimize the loop area formed by the bypass-capacitor connection, the VIN pin, and the GND pin of the system. For operation at full-rated load, use wide trace lengths to eliminate IR drop and heat dissipation. 10.2 Layout Example VIN VOUT 1 5 1 F 2.2 F 2 LP2985 3 4 ON/OFF tied to VIN if not used 10 nF Figure 10-1. Layout Diagram 18 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: LP2985 LP2985 www.ti.com SLVS522P – JULY 2004 – REVISED FEBRUARY 2022 11 Device and Documentation Support 11.1 Receiving Notification of Documentation Updates To receive notification of documentation updates, navigate to the device product folder on ti.com. Click on Subscribe to updates 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. 11.2 Support Resources TI E2E™ support forums are an engineer's go-to source for fast, verified answers and design help — straight from the experts. Search existing answers or ask your own question to get the quick design help you need. Linked content is 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. 11.3 Trademarks TI E2E™ is a trademark of Texas Instruments. All trademarks are the property of their respective owners. 11.4 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. 11.5 Glossary TI Glossary This glossary lists and explains terms, acronyms, and definitions. 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. Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: LP2985 19 PACKAGE OPTION ADDENDUM www.ti.com 14-Oct-2022 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) Device Marking (3) Samples (4/5) (6) LP2985-10DBVR ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 LRCG Samples LP2985-10DBVT ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 LRCG Samples LP2985-18DBVR ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPHG, LPHL) Samples LP2985-18DBVRE4 ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 LPHG Samples LP2985-18DBVRG4 ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 LPHG Samples LP2985-18DBVT ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPHG, LPHL) Samples LP2985-18DBVTG4 ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 LPHG Samples LP2985-25DBVR ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 (LPLG, LPLL) Samples LP2985-25DBVT ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 (LPLG, LPLL) Samples LP2985-28DBVR ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPGG, LPGL) Samples LP2985-28DBVT ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPGG, LPGL) Samples LP2985-28DBVTG4 ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 LPGG Samples LP2985-29DBVR ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 (LPMG, LPML) Samples LP2985-30DBVR ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 (LPNG, LPNL) Samples LP2985-30DBVRG4 ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 (LPNG, LPNL) Samples LP2985-30DBVT ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 (LPNG, LPNL) Samples LP2985-30DBVTG4 ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 (LPNG, LPNL) Samples LP2985-33DBVR ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPFG, LPFL) Samples LP2985-33DBVRE4 ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 LPFG Samples LP2985-33DBVRG4 ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 LPFG Samples Addendum-Page 1 PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 14-Oct-2022 Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) Device Marking (3) Samples (4/5) (6) LP2985-33DBVT ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPFG, LPFL) Samples LP2985-33DBVTE4 ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 LPFG Samples LP2985-33DBVTG4 ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 LPFG Samples LP2985-50DBVR ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 (LPSG, LPSL) Samples LP2985-50DBVRG4 ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 (LPSG, LPSL) Samples LP2985-50DBVT ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 (LPSG, LPSL) Samples LP2985-50DBVTG4 ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 (LPSG, LPSL) Samples LP2985A-10DBVR ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 LRDG Samples LP2985A-10DBVT ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 LRDG Samples LP2985A-18DBVJ ACTIVE SOT-23 DBV 5 10000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 LPTL Samples LP2985A-18DBVR ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPTG, LPTL) Samples LP2985A-18DBVRG4 ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 LPTG Samples LP2985A-18DBVT ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPTG, LPTL) Samples LP2985A-25DBVR ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 (LPUG, LPUL) Samples LP2985A-25DBVRG4 ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 (LPUG, LPUL) Samples LP2985A-25DBVT ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 (LPUG, LPUL) Samples LP2985A-28DBVR ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPJG, LPJL) Samples LP2985A-28DBVT ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPJG, LPJL) Samples LP2985A-29DBVR ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 (LPZG, LPZL) Samples LP2985A-30DBVR ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 (LRAG, LRAL) Samples LP2985A-30DBVT ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 (LRAG, LRAL) Samples Addendum-Page 2 PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 14-Oct-2022 Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) Device Marking (3) Samples (4/5) (6) LP2985A-33DBVR ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPKG, LPKL) Samples LP2985A-33DBVRG4 ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 LPKG Samples LP2985A-33DBVT ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPKG, LPKL) Samples LP2985A-33DBVTE4 ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 LPKG Samples LP2985A-33DBVTG4 ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 LPKG Samples LP2985A-50DBVR ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 (LR1G, LR1L) Samples LP2985A-50DBVRG4 ACTIVE SOT-23 DBV 5 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 (LR1G, LR1L) Samples LP2985A-50DBVT ACTIVE SOT-23 DBV 5 250 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 (LR1G, LR1L) Samples (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. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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