LP2985-33DBVRG4

Product Folder Sample & Buy Support & Community Tools & Software Technical Documents LP2985 SLVS522O – JULY 2004 – REVISED JANUARY 2015 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) 2 Applications • • • • Portable Devices Digital Cameras and Camcorders CD Players MP3 Players Device Information(1) PART NUMBER LP2985 PACKAGE SOT-23 (5) BODY SIZE (NOM) 2.90 mm x 1.60 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Dropout Voltage vs Temperature 0.45 0.4 150 mA VO = 3.3 V Cbyp = 10 nF 0.35 Dropout − (V) 1 0.3 0.25 0.2 50 mA 0.15 0.1 10 mA 0.05 1 mA 0 −50 −25 0 25 50 75 Temperature − (°C) 100 125 150 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. LP2985 SLVS522O – JULY 2004 – REVISED JANUARY 2015 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 4 6.1 Absolute Maximum Ratings ..................................... 6.2 ESD Ratings.............................................................. 6.3 Recommended Operating Conditions...................... 6.4 Thermal Information .................................................. 6.5 Electrical Characteristics.......................................... 6.6 Typical Characteristics .............................................. 4 4 4 4 5 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 ........................ 12 8.1 Application Information............................................ 12 9 Power Supply Recommendations...................... 16 10 Layout................................................................... 17 10.1 Layout Guidelines ................................................. 17 10.2 Layout Example .................................................... 17 11 Device and Documentation Support ................. 17 11.1 Trademarks ........................................................... 17 11.2 Electrostatic Discharge Caution ............................ 17 11.3 Glossary ................................................................ 17 12 Mechanical, Packaging, and Orderable Information ........................................................... 17 4 Revision History Changes from Revision N (June 2011) to Revision O 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 Documentation Feedback Copyright © 2004–2015, Texas Instruments Incorporated LP2985 www.ti.com SLVS522O – JULY 2004 – REVISED JANUARY 2015 5 Pin Configuration and Functions DBV (SOT-23) PACKAGE (TOP VIEW) VIN GND ON/OFF 1 5 VOUT 4 BYPASS 2 3 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 Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 3 LP2985 SLVS522O – JULY 2004 – REVISED JANUARY 2015 www.ti.com 6 Specifications 6.1 Absolute Maximum Ratings over virtual junction temperature range (unless otherwise noted) (1) MIN MAX VIN Continuous input voltage range (2) –0.3 16 V VON/ OFF ON/OFF input voltage range –0.3 16 V Output voltage range (3) –0.3 9 V Internally limited (short-circuit protected) Output current (4) IO (4) (5) θJA Package thermal impedance 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. The PNP pass transistor has a parasitic diode connected between the input and output. This diode normally is reverse biased (VIN > VOUT), but will be forward biased if the output voltage exceeds the input voltage by a diode drop (see Application Information for more details). If load is returned to a negative power supply in a dual-supply system, the output must be diode clamped to GND. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) – TA)/θJA. 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 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 MIN VIN Supply input voltage VON/ OFF ON/OFF input voltage IOUT Output current TJ Virtual junction temperature (1) UNIT 2.2 MAX UNIT (1) 16 0 VIN V 150 mA 125 °C –40 V 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 (1) 4 Junction-to-ambient thermal resistance 206 °C/W For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953. Submit Documentation Feedback Copyright © 2004–2015, Texas Instruments Incorporated LP2985 www.ti.com 6.5 SLVS522O – JULY 2004 – REVISED JANUARY 2015 Electrical Characteristics at specified virtual junction 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 ΔVOUT Output voltage tolerance 1 mA ≤ IL ≤ 50 mA 1 mA ≤ IL ≤ 150 mA Line regulation VIN = [VOUT(NOM) + 1 V] to 16 V IL = 0 IL = 1 mA VIN – VOUT Dropout voltage (1) IL = 10 mA IL = 50 mA IL = 150 mA TJ LP2985A-xx MIN IGND GND pin current 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 25°C 1 –40°C to 125°C 7 –40°C to 125°C VON/ OFF < 0.3 V (OFF) VON/ OFF < 0.15 V (OFF) VON/ OFF = HIGH → O/P ON VON/ OFF ON/OFF input voltage (2) VON/ OFF = LOW → O/P OFF VON/ OFF = 0 ION/ OFF ON/OFF input current VON/ OFF = 5 V (1) (2) 3 1 3 7 10 40 –40°C to 125°C 15 60 40 90 25°C 120 –40°C to 125°C 280 –40°C to 125°C 150 120 280 150 350 575 95 65 95 25°C (LP2985-10) 125 125 –40°C to 125°C 125 125 –40°C to 125°C (LP2985-10) 160 160 75 110 25°C (LP2985-10) 140 –40°C to 125°C 170 120 75 110 140 170 220 120 220 25°C (LP2985-10) 250 250 –40°C to 125°C 400 400 350 600 350 650 650 –40°C to 125°C 1000 1000 850 1500 1800 –40°C to 125°C 2500 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 –40°C to 125°C 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 600 25°C (LP2985-10) 25°C (LP2985-10) mV 225 350 575 65 60 90 225 25°C %/V 5 10 15 25°C 0.014 0.032 5 25°C %VNOM 4 0.007 0.032 25°C IL = 150 mA 0.014 UNIT MAX –1 25°C IL = 50 mA TYP –1.5 25°C IL = 10 mA MIN 25°C 25°C IL = 1 mA LP2985-xx MAX 25°C 25°C IL = 0 TYP 0.15 0.01 –2 5 –2 5 15 μA 15 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 Application Information). Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 5 LP2985 SLVS522O – JULY 2004 – REVISED JANUARY 2015 www.ti.com Electrical Characteristics (continued) at specified virtual junction 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 TJ LP2985A-xx MIN TYP MAX LP2985-xx 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 IOUT(SC) Short-circuit current RL = 0 (steady state) (3) 25°C 400 400 mA (3) 6 See Figure 6 in Typical Performance Characteristics. Submit Documentation Feedback Copyright © 2004–2015, Texas Instruments Incorporated LP2985 www.ti.com SLVS522O – JULY 2004 – REVISED JANUARY 2015 6.6 Typical Characteristics CIN = 1 μF, COUT = 4.7 μF, VIN = VOUT(NOM) + 1 V, TA = 25°C, 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 VO = 10 V 10.15 3.335 CO = 4.7 µF Output Voltage − (V) Output Voltage – V CI = 1 µF 10.10 IO = 1 mA 10.05 10.00 3.325 3.315 9.95 3.305 9.90 9.85 -50 3.295 −50 -25 0 25 50 75 100 125 −25 0 150 25 50 75 100 125 150 Temperature − (°C) Temperature – °C Figure 2. Output Voltage vs Temperature Figure 1. Output Voltage vs Temperature 0.45 0.35 Dropout − (V) VI = 6 V VO = 3.3 V Ci = 1 mF Cbyp = 0.01 mF 0.45 Short-Circuit Current − (A) 0.4 0.5 150 mA VO = 3.3 V Cbyp = 10 nF 0.3 0.25 0.2 50 mA 0.15 0.1 0.4 0.35 0.3 0.25 0.2 0.15 0.1 10 mA 0.05 0.05 1 mA 0 −50 −25 0 25 50 75 Temperature − (°C) 100 125 0 −500 150 Figure 3. Dropout Voltage vs Temperature 0.5 1500 2000 Figure 4. Short-circuit Current vs Time VO = 3.3 V 300 0.35 ISC − (mA) Short-Circuit Current − (A) 0.4 500 1000 Time − (ms) 320 VI = 16 V VO = 3.3 V Ci = 1 mF Cbyp = 0.01 mF 0.45 0 0.3 0.25 280 260 0.2 240 0.15 0.1 220 0.05 0 −100 100 300 500 Time − (ms) 700 Figure 5. Short-circuit Current vs Time Copyright © 2004–2015, Texas Instruments Incorporated 200 0 0.5 1 1.5 2 2.5 Output Voltage − (V) 3 3.5 Figure 6. Short-circuit Current vs Output Voltage Submit Documentation Feedback 7 LP2985 SLVS522O – JULY 2004 – REVISED JANUARY 2015 www.ti.com Typical Characteristics (continued) CIN = 1 μF, COUT = 4.7 μF, VIN = VOUT(NOM) + 1 V, TA = 25°C, ON/OFF pin tied to VIN (unless otherwise specified) 1200 100 VO = 3.3 V Cbyp = 10 nF 1100 Ripple Rejection − (dB) 80 900 Ground Pin Current − mA VI = 5 V VO = 3.3 V Co = 10 mF Cbyp = 0 nF 90 1000 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 120 140 160 10 Figure 7. Ground Pin Current vs Load Current VI = 3.7 V VO = 3.3 V Co = 10 mF Cbyp = 0 nF 100k 1M Figure 8. Ripple Rejection vs Frequency VI = 5 V VO = 3.3 V Co = 4.7 mF Cbyp = 10 nF 90 80 Ripple Rejection − (dB) Ripple Rejection − (dB) 80 70 1 mA 60 50 mA 40 150 mA 70 1 mA 60 50 40 50 mA 30 20 20 10 10 0 150 mA 0 10 100 1k 10k 100k 1M 10 100 Frequency − (Hz) Figure 9. Ripple Rejection vs Frequency 70 Output Impedance − (W) VI = 5 V VO = 3.3 V Co = 4.7 mF Cbyp = 10 nF 80 1 mA 60 10 mA 50 40 10k 100k 1M Figure 10. Ripple Rejection vs Frequency 10 90 1k Frequency − (Hz) 100 Ripple Rejection − (dB) 10k 100 90 30 1k Frequency − (Hz) 100 50 100 100 mA 30 1 Ci = 1 mF Co = 10 mF VO = 3.3 V 1 mA 10 mA 100 mA 0.1 0.01 20 10 0 10 100 1k 10k Frequency − (Hz) 100k 1M Figure 11. Ripple Rejection vs Frequency 8 Submit Documentation Feedback 0.001 10 100 1k 10k 100k 1M Frequency − (Hz) Figure 12. Output Impedance vs Frequency Copyright © 2004–2015, Texas Instruments Incorporated LP2985 www.ti.com SLVS522O – JULY 2004 – REVISED JANUARY 2015 Typical Characteristics (continued) CIN = 1 μF, COUT = 4.7 μF, VIN = VOUT(NOM) + 1 V, TA = 25°C, ON/OFF pin tied to VIN (unless otherwise specified) 10 ILOAD = 150 mA Noise Density − (mV/ Hz) 1 Output Impedance − (W) 10 Ci = 1 mF Co = 4.7 mF VO = 3.3 V 1 mA 10 mA 100 mA 0.1 1 Cbyp = 100 pF Cbyp = 1 nF 0.1 Cbyp = 10 nF 0.01 0.01 0.001 10 100 1k 10k 100k 100 1M 1k 100k Figure 14. Output Noise Density vs Frequency Figure 13. Output Impedance vs Frequency 10 1.8 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 Frequency − (Hz) Frequency − (Hz) Cbyp = 100 pF Cbyp = 1 nF 0.1 Cbyp = 10 nF 1.2 1 0.8 RL = Open 0.6 0.4 0.2 0.01 100 1k 10k Frequency − (Hz) 100k Figure 15. Output Noise Density vs Frequency 0 0 1 2 3 4 5 6 Input Voltage − (V) Figure 16. Input Current vs Input Voltage 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 17. Ground-pin Current vs Temperature Copyright © 2004–2015, Texas Instruments Incorporated Figure 18. 2.2-μF Stable ESR Range for Output Voltage ≤ 2.3 V Submit Documentation Feedback 9 LP2985 SLVS522O – JULY 2004 – REVISED JANUARY 2015 www.ti.com Typical Characteristics (continued) CIN = 1 μF, COUT = 4.7 μF, VIN = VOUT(NOM) + 1 V, TA = 25°C, ON/OFF pin tied to VIN (unless otherwise specified) Figure 19. 4.7-μF Stable ESR Range for Output Voltage ≤ 2.3 V 10 Submit Documentation Feedback Figure 20. 2.2-μF/3.3-μF Stable ESR Range for Output Voltage ≥ 2.5 V Copyright © 2004–2015, Texas Instruments Incorporated LP2985 www.ti.com SLVS522O – JULY 2004 – REVISED JANUARY 2015 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 VIN ON/OFF VREF 1.23 V − + BYPASS VOUT Overcurrent/ Overtemperature Protection 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 1mA 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. 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. Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 LP2985 SLVS522O – JULY 2004 – REVISED JANUARY 2015 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 following application schematic shows the standard usage of the LP2985 as a low-dropout regulator. 8.1.1 Typical Application LP2985 VIN 1 VOUT 5 2.2 µF 1 µF GND ON/OFF 2 3 4 BYPASS 10 nF 8.1.2 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 8.1.3 Capacitors 8.1.3.1 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 should 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. 12 Submit Documentation Feedback Copyright © 2004–2015, Texas Instruments Incorporated LP2985 www.ti.com SLVS522O – JULY 2004 – REVISED JANUARY 2015 Application Information (continued) 8.1.3.2 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 also should 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 18 through Figure 20 It is critical that both the minimum capacitance and ESR requirement be met over the entire operating temperature range. Depending on the type of capacitors used, both these parameters can vary significantly with temperature (see capacitor characteristics). 8.1.3.3 Noise Bypass Capacitor (CBYPASS) The LP2985 allows for low-noise performance with the use of a bypass capacitor that is connected to the internal bandgap reference via the BYPASS pin. This high-impedance bandgap 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 should be minimized as much as possible and never should exceed 100 nA. A 10-nF capacitor is recommended for CBYPASS. Ceramic and film capacitors are well suited for this purpose. 8.1.3.4 Reverse Input-Output Voltage There is an inherent diode present across the PNP pass element of the LP2985. VIN VOUT 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, an external Schottky diode should 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 ∼0.3 V, preventing the regulator’s internal diode from forward biasing. Schottky VIN VOUT LP2985 Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 13 LP2985 SLVS522O – JULY 2004 – REVISED JANUARY 2015 www.ti.com Application Information (continued) 8.1.4 Detailed Design Procedure 8.1.4.1 Capacitor Characteristics 8.1.4.1.1 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 stability over the entire operating temperature range. Note that there are some ceramic capacitors that can maintain a ±15% capacitance tolerance over temperature. 8.1.4.1.2 Tantalum Tantalum capacitors can be used at the output of the LP2985, but there are significant disadvantages that could 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. 8.1.4.2 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, ON/OFF should be connected 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. 3.4 200 3.38 150 3.38 150 3.36 100 3.36 100 3.34 3.32 3.3 IL VO = 3.3 V Cbyp = 10 nF DIL = 100 mA 50 0 −50 VO 3.28 −100 3.26 −150 3.24 −200 3.22 −250 20 ms/div→ Figure 21. Load Transient Response 14 Submit Documentation Feedback IL 3.34 3.32 3.3 VO = 3.3 V Cbyp = 10 nF DIL = 150 mA 50 0 −50 VO 3.28 −100 3.26 −150 3.24 −200 Load Current − (mA) 200 Output Voltage − (V) 3.4 Load Current − (mA) Output Voltage − (V) 8.1.5 Application Curves −250 3.22 20 ms/div→ Figure 22. Load Transient Response Copyright © 2004–2015, Texas Instruments Incorporated LP2985 www.ti.com SLVS522O – JULY 2004 – REVISED JANUARY 2015 Application Information (continued) 200 3.38 150 3.36 100 3.41 5.5 3.39 5 VI 0 −50 VO 3.28 −100 3.26 −150 3.24 −200 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 24. Line Transient Response 5.5 3.41 5.5 3.39 5 3.39 5 4.5 3.37 VI 3.37 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 23. Load Transient Response 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 Input Voltage − (V) 3.3 VO = 3.3 V Cbyp = 0 nF DIL = 150 mA Output Voltage − (V) 3.32 Load Current − (mA) Output Voltage − (V) 3.37 50 IL 3.34 Input Voltage − (V) 3.4 2.5 VO 3.27 2 2 20 ms/div→ 20 ms/div→ Figure 25. Line Transient Response Figure 26. Line Transient Response 4 5.5 3.41 10 VO 3 5 3.39 8 3.5 3.31 VO 3 1 6 0 −1 VO = 3.3 V Cbyp = 0 IO = 150 mA 4 −2 VON/OFF 3.29 3.27 2.5 −3 2 −4 100 ms/div→ Figure 27. Line Transient Response Copyright © 2004–2015, Texas Instruments Incorporated VON/OFF − (V) VO = 3.3 V Cbyp = 10 nF IO = 1 mA 2 Output Voltage − (V) Output Voltage − (V) 4 3.35 3.33 4.5 Input Voltage − (V) VIN 3.37 2 0 100 ms/div→ Figure 28. Turn-on Time Submit Documentation Feedback 15 LP2985 SLVS522O – JULY 2004 – REVISED JANUARY 2015 www.ti.com Application Information (continued) 10 4 10 4 VO VO 3 3 8 8 0 −1 VO = 3.3 V Cbyp = 100 pF ILOAD = 150 mA 4 −2 VON/OFF Output Voltage − (V) 6 VON/OFF − (V) Output Voltage − (V) 1 1 6 0 −1 VO = 3.3 V Cbyp = 1 nF ILOAD = 150 mA 4 VON/OFF − (V) 2 2 VON/OFF −2 2 2 −3 −3 0 −4 0 −4 2 ms/div→ 200 ms/div→ Figure 30. Turn-on Time Figure 29. 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 31. Turn-on Time 9 Power Supply Recommendations A power supply may be used at the input voltage within the ranges given in the Recommended Operating Conditions table. It is recommended to use bypass capacitors as described in Layout Guidelines. 16 Submit Documentation Feedback Copyright © 2004–2015, Texas Instruments Incorporated LP2985 www.ti.com SLVS522O – JULY 2004 – REVISED JANUARY 2015 10 Layout 10.1 Layout Guidelines • • • It is recommended that the input pin be bypassed 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, it is recommended to 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 32. Layout Diagram 11 Device and Documentation Support 11.1 Trademarks All trademarks are the property of their respective owners. 11.2 Electrostatic Discharge Caution 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. 11.3 Glossary SLYZ022 — 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. 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Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 17 PACKAGE OPTION ADDENDUM www.ti.com 6-Feb-2020 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) LP2985-10DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 LRCG LP2985-10DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 LRCG LP2985-18DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPHG, LPHL) LP2985-18DBVRE4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 LPHG LP2985-18DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 LPHG LP2985-18DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPHG, LPHL) LP2985-18DBVTE4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 LPHG LP2985-18DBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 LPHG LP2985-25DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 (LPLG, LPLL) LP2985-25DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 (LPLG, LPLL) LP2985-28DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPGG, LPGL) LP2985-28DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPGG, LPGL) LP2985-28DBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 LPGG LP2985-29DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 (LPMG, LPML) LP2985-30DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 (LPNG, LPNL) LP2985-30DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 (LPNG, LPNL) LP2985-30DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 (LPNG, LPNL) Addendum-Page 1 Samples PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 6-Feb-2020 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) LP2985-30DBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 (LPNG, LPNL) LP2985-33DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPFG, LPFL) LP2985-33DBVRE4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 LPFG LP2985-33DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 LPFG LP2985-33DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPFG, LPFL) LP2985-33DBVTE4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 LPFG LP2985-33DBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 LPFG LP2985-50DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 (LPSG, LPSL) LP2985-50DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 (LPSG, LPSL) LP2985-50DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 (LPSG, LPSL) LP2985-50DBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 (LPSG, LPSL) LP2985A-10DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 LRDG LP2985A-10DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 LRDG LP2985A-18DBVJ ACTIVE SOT-23 DBV 5 10000 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 LPTL LP2985A-18DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPTG, LPTL) LP2985A-18DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 LPTG LP2985A-18DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPTG, LPTL) LP2985A-25DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 (LPUG, LPUL) Addendum-Page 2 Samples PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 6-Feb-2020 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) LP2985A-25DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 (LPUG, LPUL) LP2985A-25DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 (LPUG, LPUL) LP2985A-28DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPJG, LPJL) LP2985A-28DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPJG, LPJL) LP2985A-29DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 (LPZG, LPZL) LP2985A-30DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 (LRAG, LRAL) LP2985A-30DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 (LRAG, LRAL) LP2985A-33DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPKG, LPKL) LP2985A-33DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 LPKG LP2985A-33DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU | SN Level-1-260C-UNLIM -40 to 125 (LPKG, LPKL) LP2985A-33DBVTE4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 LPKG LP2985A-33DBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 LPKG LP2985A-50DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 (LR1G, LR1L) LP2985A-50DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 (LR1G, LR1L) LP2985A-50DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 125 (LR1G, LR1L) (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 3 Samples PACKAGE OPTION ADDENDUM www.ti.com 6-Feb-2020 (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