LM2772 www.ti.com SNVS486B - DECEMBER 2006 - REVISED MAY 2013 LM2772 Low-Ripple Switched Capacitor Step-Down Regulator Check for Samples: LM2772 FEATURES DESCRIPTION * * * * * * * * * * * * The LM2772 is a switched capacitor step-down regulator that produces a 1.2V output. It is capable of supplying loads up to 150mA with 3% output voltage regulation over line, load, and temperature. The LM2772 operates with an input voltage from 3.0V to 5.5V, accommodating 1-cell Li-Ion batteries and chargers. 1 2 Low-Noise Fixed Frequency Operation 1.2V Output Voltage 3% Output Voltage Regulation Li-Ion (3.6V) to 1.2V with 80% Efficiency Very Low Output Ripple: 8mV @ 150mA Output Currents up to 150mA 2.7V to 5.5V Input Voltage Range Shutdown Disconnects Load from VIN 1.1MHz Switching Frequency No Inductors...Small Solution Size Short Circuit and Thermal Protection WSON-10 Package (3mm x 3mm x 0.8mm) APPLICATIONS * * * The LM2772 utilizes a highly efficient regulated multigain charge pump. Pre-regulated 1.1MHz fixedfrequency switching results in very low ripple and noise on both the input and the output. When output currents are low, the part automatically switches to a low-ripple PFM regulation mode to maintain high efficiency over the entire load range. The LM2772 is available in TI's WSON-10 Package (WSON-10). DSP, Memory, and Microprocessor Power Supplies Mobile Phones and Pagers Portable Electronic Devices Typical Application Circuit VOUT: 1.2V VIN = 3.0V to 5.5V IOUT up to 150 mA VIN VOUT CIN COUT 1 F 4.7 F C1+ GND LM2772 C1 1 F High: ON Low: Shutdown C1C2+ EN C3+ C3 1 F C2 1 F C3- C2- Capacitors: 1 F - TDK C1005X5R0J105K 4.7 F - TDK C1608X5R0J475K or equivalent Figure 1. Figure 2. LM2772 Efficiency vs. Low-Dropout Linear Regulator (LDO) Efficiency 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright (c) 2006-2013, Texas Instruments Incorporated LM2772 SNVS486B - DECEMBER 2006 - REVISED MAY 2013 www.ti.com Connection Diagram VIN 1 10 EN EN 10 1 VIN GND 2 9 C1+ C1+ 9 2 GND VOUT 3 8 C1- C1- 8 3 VOUT C3- 4 7 C2+ C2+ 7 4 C3- C3+ 5 6 C2- C2- 6 5 C3+ Die-Attach Pad: GND Die-Attach Pad: GND Top View Bottom View 10-Pin WSON Package (WSON-10) See Package Number DSC0010A PIN DESCRIPTIONS Pin # Name 1 VIN Description 2 GND Ground 3 VOUT Output Voltage 4 C3- Flying Capacitor 3: Negative Terminal 5 C3+ Flying Capacitor 3: Positive Terminal 6 C2- Flying Capacitor 2: Negative Terminal 7 C2+ Flying Capacitor 2: Positive Terminal 8 C1- Flying Capacitor 1: Negative Terminal 9 C1+ Flying Capacitor 1: Positive Terminal 10 EN Enable Pin Logic Input. Applying a logic HIGH voltage signal enables the part. A logic LOW voltage signal places the the device in shutdown. Input Voltage: Recommended VIN operating range 3.0V to 5.5V. 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. 2 Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: LM2772 LM2772 www.ti.com SNVS486B - DECEMBER 2006 - REVISED MAY 2013 Absolute Maximum Ratings (1) (2) (3) VIN Pin Voltage -0.3V to 6.0V EN Pin Voltage -0.3V to (VIN+0.3V) w/ 6.0V max Continuous Power Dissipation (4) Internally Limited Junction Temperature (TJ-MAX) 150C Storage Temperature Range Maximum Lead Temperature -65C to +150 C (5) 265C ESD Rating (6) Human Body Model: (1) (2) (3) (4) (5) (6) 2.0kV Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under which operation of the device is ensured. Operating Ratings do not imply ensured performance limits. For ensured performance limits and associated test conditions, see the Electrical Characteristics tables. If Military/Aerospace specified devices are required, please contact the TI Sales Office/Distributors for availability and specifications. All voltages are with respect to the potential at the GND pins. Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at TJ=150C (typ.) and disengages at TJ=140C (typ.). For detailed information on soldering requirements and recommendations, please refer to Texas Instruments' Application Note 1187 (SNOA401): Leadless Leadframe Package (LLP). The Human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin. MIL-STD-883 3015.7 Operating Ratings (1) (2) Input Voltage Range 2.7V to 5.5V Recommended Load Current Range 0mA to 150mA Junction Temperature (TJ) Range -30C to +110C Ambient Temperature (TA) Range (3) (1) (2) (3) -30C to +85C Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under which operation of the device is ensured. Operating Ratings do not imply ensured performance limits. For ensured performance limits and associated test conditions, see the Electrical Characteristics tables. All voltages are with respect to the potential at the GND pins. Maximum ambient temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX-OP = 110C), the maximum power dissipation of the device in the application (PD-MAX), and the junction-to ambient thermal resistance of the part/package in the application (JA), as given by the following equation: TA-MAX = TJ-MAX-OP - (JA x PD-MAX). Thermal Properties Junction-to-Ambient Thermal Resistance (JA), WSON-10 Package (1) (1) 55C/W Junction-to-ambient thermal resistance is highly application and board-layout dependent. In applications where high maximum power dissipation exists, special care must be paid to thermal dissipation issues. Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: LM2772 3 LM2772 SNVS486B - DECEMBER 2006 - REVISED MAY 2013 www.ti.com Electrical Characteristics (1) (2) Limits in standard typeface are for TJ = 25C. Limits in boldface type apply over the full operating junction temperature range (-30C TJ +110C) . Unless otherwise noted, specifications apply to the LM2772 Typical Application Circuit (pg. 1) with: VIN = 3.6V; V(EN) = 1.8V, CIN = C1 = C2 = C3 = 1.0F, COUT = 4.7F. (3) Symbol VOUT Parameter 1.2V Output Voltage Regulation Typ Max 3.0V VIN 5.5V 0mA IOUT 150mA Condition 1.164 (-3%) Min 1.2 1.236 (+3%) 0mA IOUT 150mA 1.178 (-1.8%) 1.2 1.236 (+3.0%) 0mA IOUT 150mA Units V VOUT/IOUT Output Load Regulation VOUT/VIN Output Line Regulation E Power Efficiency IOUT = 150mA 80 IQ Quiescent Supply Current IOUT = 0mA (4) 47 VR Fixed Frequency Output Ripple 40mA IOUT 150mA 8 VR-PFM PFM-Mode Output Ripple IOUT < 40mA 12 ISD Shutdown Current V(EN) = 0V 0.01 0.3 A FSW Switching Frequency 3.0V VIN 5.5V 1.15 1.50 MHz ICL Output Current Limit VIN = 5.5V 0V VOUT 0.2V tON Turn-on Time VIL Logic-low Input Voltage 3.0V VIN 5.5V 0 VIH Logic-high Input Voltage 3.0V VIN 5.5V 1.1 IIH Logic-high Input Current V(EN) = 1.8V (5) 5 A IIL Logic-low Input Current Logic Input = 0V 0.01 A (1) (2) (3) (4) (5) 4 0.80 0.15 mV/mA 0.2 %/V % 50 A mV mV 500 mA 150 s 0.63 VIN V V All voltages are with respect to the potential at the GND pins. Min and Max limits are specified by design, test, or statistical analysis. Typical numbers are not ensured, but do represent the most likely norm. CIN, COUT, C1, C2, C3: Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics. VOUT is set to 1.3V during this test (Device is not switching). There is a 350k pull-down resistor connected internally between the EN pin and GND. Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: LM2772 LM2772 www.ti.com SNVS486B - DECEMBER 2006 - REVISED MAY 2013 BLOCK DIAGRAM LM2772 VIN C1+ C11.04M SWITCH ARRAY GAIN CONTROL 950k SWITCH CONTROL 1 2 C2+ 1 G =2, 5,3 C2C3+ C3- 775k PFM Control GND VOUT Current sense 1.1 MHz OSC. 1.25V Ref. EN Enable/ Shutdown Control EN Soft-Start Ramp 0.8V Ref. Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: LM2772 5 LM2772 SNVS486B - DECEMBER 2006 - REVISED MAY 2013 www.ti.com Typical Performance Characteristics Unless otherwise specified: VIN = 3.6V, CIN = C1 = C2 = C3 = 1.0F, COUT = 4.7F, TA = 25C. Capacitors are low-ESR multilayer ceramic capacitors (MLCC's). Output Voltage vs. Input Voltage Output Voltage vs. Output Current Figure 3. Figure 4. Efficiency vs. Input Voltage Operating Supply Current Figure 5. Figure 6. Input and Output Voltage Ripple, Load = 150mA Load Step 10mA to 150mA, VIN = 3.6V CH1: VIN, Scale: 50mV/Div, AC Coupled CH3: VOUT, Scale: 10mV/Div, AC Coupled Time scale: 1s/Div Figure 7. 6 Submit Documentation Feedback CH3: VOUT; Scale: 50mV/Div, AC Coupled CH4: IOUT; Scale: 100mA/Div Time scale: 40s/Div Figure 8. Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: LM2772 LM2772 www.ti.com SNVS486B - DECEMBER 2006 - REVISED MAY 2013 Typical Performance Characteristics (continued) Unless otherwise specified: VIN = 3.6V, CIN = C1 = C2 = C3 = 1.0F, COUT = 4.7F, TA = 25C. Capacitors are low-ESR multilayer ceramic capacitors (MLCC's). Load Step 10mA to 150mA, VIN = 4.7V CH3: VOUT; Scale: 50mV/Div, AC Coupled CH4: IOUT; Scale: 100mA/Div Time scale: 40s/Div Figure 9. Line Step 3.5V to 4.0V with Load = 150mA CH2: VIN; Scale: 1V/Div, DC Coupled CH3: VOUT; Scale: 20mV/Div, AC Coupled Time scale: 400s/Div Figure 10. Line Step 4.0V to 3.5V with Load = 150mA CH2: VIN; Scale: 1V/Div, DC Coupled CH3: VOUT; Scale: 20mV/Div, AC Coupled Time scale: 400s/Div Figure 11. Oscillator Frequency vs. Input Voltage Figure 12. Startup Behavior, Load = 150mA CH1: VOUT; Scale: 200mV/Div, DC Coupled Time scale: 20s/Div Figure 13. Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: LM2772 7 LM2772 SNVS486B - DECEMBER 2006 - REVISED MAY 2013 www.ti.com OPERATION DESCRIPTION Overview The LM2772 is a switched capacitor converter that produces a regulated, low voltage output. The core of the part is a highly efficient charge pump that utilizes fixed frequency pre-regulation and Pulse Frequency Modulation to minimize ripple and power losses over wide input voltage and output current ranges. A description of the principal operational characteristics of the LM2772 is detailed in the Circuit Description, and Efficiency Performance sections. These sections refer to details in the Block Diagram. Circuit Description The core of the LM2772 is a two-phase charge pump controlled by an internally generated non-overlapping clock. The charge pump operates by using external flying capacitors C1, C2, and C3 to transfer charge from the input to the output. At input voltages below 3.5V (typ.) the LM2772 operates in a 1/2x Gain, with the input current being equal to 1/2 of the load current. At input voltages between 3.5V to 4.6V(typ.) the part utilizes a gain of 2/5x, resulting in an input current equal to 2/5 times the load current. At input voltages above 4.6V (typ.), the part is in a gain of 1/3, with the input current being 1/3 of the load current. The two phases of the switched capacitor switching cycle will be referred to as the "charge phase" and the "discharge phase". During the charge phase, the flying capacitor is charged by the input supply. After half of the switching cycle [ t = 1/(2xFSW) ], the LM2772 switches to the discharge phase. In this configuration, the charge that was stored on the flying capacitors in the charge phase is transferred to the output. The LM2772 uses fixed frequency pre-regulation to regulate the output voltage to 1.2V during moderate to high load currents. The input and output connections of the flying capacitors are made with internal MOS switches. Pre-regulation limits the gate drive of the MOS switch connected between the voltage input and the flying capacitors. Controlling the on resistance of this switch limits the amount of charge transferred into and out of each flying capacitor during the charge and discharge phases, and in turn helps to keep the output ripple very low. When output currents are low (<40mA typ.), the LM2772 automatically switches to a low-ripple Pulse Frequency Modulation (PFM) form of regulation. In PFM mode, the flying capacitors stay in the discharge phase until the output voltage drops below a predetermined trip point. When this occurs, the flying capacitors switch back to the charge phase. After being charged, the flying capacitors repeat the process of staying in the discharge phase and switching to the charge phase when necessary. Efficiency Performance Charge-pump efficiency is derived in the following two ideal equations (supply current and other losses are neglected for simplicity): IIN = G x IOUT E = (VOUT x IOUT) / (VIN x IIN) = VOUT / (G x VIN) (1) (2) In the equations, G represents the charge pump gain. Efficiency is at its highest as GxVIN approaches VOUT. Refer to the efficiency graph in the Typical Performance Characteristics section for detailed efficiency data. The transition between gains of 1/2, 2/5, and 1/3 are clearly distinguished by the sharp discontinuity in the efficiency curve. Shutdown The LM2772 is in shutdown mode when the voltage on the enable pin (EN) is logic-low. In shutdown, the LM2772 draws virtually no supply current. When in shutdown, the output of the LM2772 is completely disconnected from the input. Internal feedback resistors pull the output voltage down to 0V during shutdown. Soft Start The LM2772 employs soft start circuitry to prevent excessive input inrush currents during startup. At startup, the output voltage gradually rises from 0V to the nominal output voltage. This occurs in 150s (typ.). Soft-start is engaged when the part is enabled, including situations where voltage is established simultaneously on the VIN and EN pins. 8 Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: LM2772 LM2772 www.ti.com SNVS486B - DECEMBER 2006 - REVISED MAY 2013 Thermal Shutdown Protection from damage related to overheating is achieved with a thermal shutdown feature. When the junction temperature rises to 150C (typ.), the part switches into shutdown mode. The LM2772 disengages thermal shutdown when the junction temperature of the part is reduced to 140C (typ.). Due to the high efficiency of the LM2772, thermal shutdown and/or thermal cycling should not be encountered when the part is operated within specified input voltage, output current, and ambient temperature operating ratings. If thermal cycling is seen under these conditions, the most likely cause is an inadequate PCB layout that does not allow heat to be sufficiently dissipated out of the WSON package. Current Limit Protection The LM2772 charge pump contains current limit protection circuitry that protects the device during VOUT fault conditions where excessive current is drawn. Output current is limited to 500mA (typ). APPLICATION INFORMATION Recommended Capacitor Types The LM2772 requires 5 external capacitors for proper operation. Surface-mount multi-layer ceramic capacitors are recommended. These capacitors are small, inexpensive and have very low equivalent series resistance (ESR, 15m typ.). Tantalum capacitors, OS-CON capacitors, and aluminum electrolytic capacitors generally are not recommended for use with the LM2772 due to their high ESR, as compared to ceramic capacitors. For most applications, ceramic capacitors with an X7R or X5R temperature characteristic are preferred for use with the LM2772. These capacitors have tight capacitance tolerance (as good as 10%) and hold their value over temperature (X7R: 15% over -55C to 125C; X5R: 15% over -55C to 85C). Capacitors with a Y5V or Z5U temperature characteristic are generally not recommended for use with the LM2772. These types of capacitors typically have wide capacitance tolerance (+80%, -20%) and vary significantly over temperature (Y5V: +22%, -82% over -30C to +85C range; Z5U: +22%, -56% over +10C to +85C range). Under some conditions, a 1F-rated Y5V or Z5U capacitor could have a capacitance as low as 0.1F. Such detrimental deviation is likely to cause Y5V and Z5U capacitors to fail to meet the minimum capacitance requirements of the LM2772. Net capacitance of a ceramic capacitor decreases with increased DC bias. This degradation can result in lower capacitance than expected on the input and/or output, resulting in higher ripple voltages and currents. Using capacitors at DC bias voltages significantly below the capacitor voltage rating will usually minimize DC bias effects. Consult capacitor manufacturers for information on capacitor DC bias characteristics. Capacitance characteristics can vary quite dramatically with different application conditions, capacitor types, and capacitor manufacturers. It is strongly recommended that the LM2772 circuit be thoroughly evaluated early in the design-in process with the mass-production capacitors of choice. This will help ensure that any such variability in capacitance does not negatively impact circuit performance. The table below lists some leading ceramic capacitor manufacturers. Manufacturer Contact Information AVX www.avx.com Murata www.murata.com Taiyo-Yuden www.t-yuden.com TDK www.component.tdk.com Vishay-Vitramon www.vishay.com Output Capacitor and Output Voltage Ripple The output capacitor in the LM2772 circuit (COUT) directly impacts the magnitude of output voltage ripple. Other prominent factors also affecting output voltage ripple include input voltage, output current and flying capacitance. Due to the complexity of the regulation topology, providing equations or models to approximate the magnitude of the ripple can not be easily accomplished. But one important generalization can be made: increasing (decreasing) the output capacitance will result in a proportional decrease (increase) in output voltage ripple. Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: LM2772 9 LM2772 SNVS486B - DECEMBER 2006 - REVISED MAY 2013 www.ti.com In typical high-current applications, a 4.7F low-ESR ceramic output capacitor is recommended. Different output capacitance values can be used to reduce ripple, shrink the solution size, and/or cut the cost of the solution. But changing the output capacitor may also require changing the flying capacitor and/or input capacitor to maintain good overall circuit performance. Performance of the LM2772 with different capacitor setups in discussed in the section Recommended Capacitor Configurations. High ESR in the output capacitor increases output voltage ripple. If a ceramic capacitor is used at the output, this is usually not a concern because the ESR of a ceramic capacitor is typically very low and has only a minimal impact on ripple magnitudes. If a different capacitor type with higher ESR is used (tantalum, for example), the ESR could result in high ripple. To eliminate this effect, the net output ESR can be significantly reduced by placing a low-ESR ceramic capacitor in parallel with the primary output capacitor. The low ESR of the ceramic capacitor will be in parallel with the higher ESR, resulting in a low net ESR based on the principles of parallel resistance reduction. Input Capacitor and Input Voltage Ripple The input capacitor (CIN) is a reservoir of charge that aids a quick transfer of charge from the supply to the flying capacitors during the charge phase of operation. The input capacitor helps to keep the input voltage from drooping at the start of the charge phase when the flying capacitors are connected to the input. It also filters noise on the input pin, keeping this noise out of sensitive internal analog circuitry that is biased off the input line. Much like the relationship between the output capacitance and output voltage ripple, input capacitance has a dominant and first-order effect on input ripple magnitude. Increasing (decreasing) the input capacitance will result in a proportional decrease (increase) in input voltage ripple. Input voltage, output current, and flying capacitance also will affect input ripple levels to some degree. In typical high-current applications, a 1F low-ESR ceramic capacitor is recommended on the input. Different input capacitance values can be used to reduce ripple, shrink the solution size, and/or cut the cost of the solution. But changing the input capacitor may also require changing the flying capacitor and/or output capacitor to maintain good overall circuit performance. Performance of the LM2772 with different capacitor setups is discussed below in Recommended Capacitor Configurations. Flying Capacitors The flying capacitors (C1, C2, C3) transfer charge from the input to the output. Flying capacitance can impact both output current capability and ripple magnitudes. If flying capacitance is too small, the LM2772 may not be able to regulate the output voltage when load currents are high. On the other hand, if the flying capacitance is too large, the flying capacitor might overwhelm the input and output capacitors, resulting in increased input and output ripple. In typical high-current applications, 1F low-ESR ceramic capacitors are recommended for the flying capacitors. Polarized capacitors (tantalum, aluminum electrolytic, etc.) must not be used for the flying capacitor, as they could become reverse-biased during LM2772 operation. Recommended Capacitor Configurations The data in Table 1 can be used to assist in the selection of a capacitor configuration that best balances solution size and cost with the electrical requirements of the application. As previously discussed, input and output ripple voltages will vary with output current and input voltage. The numbers provided show expected ripple voltage with VIN = 3.6V and a load current of 150mA. The table offers a first look at approximate ripple levels and provides a comparison of different capacitor configurations, but is not intended to ensure performance. With any capacitance configuration chosen, always verify that the performance of the ripple waveforms are suitable for the intended application. The same capacitance value must be used for all the flying capacitors. 10 Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: LM2772 LM2772 www.ti.com SNVS486B - DECEMBER 2006 - REVISED MAY 2013 Table 1. LM2772 Performance with Different Capacitor Configurations CAPACITOR CONFIGURATION (VIN = 3.6V) (1) TYPICAL INPUT RIPPLE TYPICAL OUTPUT RIPPLE CIN = 1F, COUT = 4.7F, C1, C2, C3 = 1F 54mV 4mV CIN = 1F, COUT = 2.2F, C1, C2, C3 = 1F 48mV 6mV CIN = 0.47F, COUT = 4.7F, C1, C2, C3 = 1F 83mV 5mV CIN = 0.47F, COUT = 3.3F, C1, C2, C3 = 1F 82mV 4mV CIN = 0.47F, COUT = 3.3F, C1, C2, C3 = 0.47F 83mV 5mV (1) Refer to the text in the Recommended Capacitor Configurations section for detailed information on the data in this table Layout Guidelines Proper board layout will help to ensure optimal performance of the LM2772 circuit. The following guidelines are recommended: * Place capacitors as close to the LM2772 as possible, and preferably on the same side of the board as the IC. * Use short, wide traces to connect the external capacitors to the LM2772 to minimize trace resistance and inductance. * Use a low resistance connection between ground and the GND pin of the LM2772. Using wide traces and/or multiple vias to connect GND to a ground plane on the board is most advantageous. Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: LM2772 11 LM2772 SNVS486B - DECEMBER 2006 - REVISED MAY 2013 www.ti.com REVISION HISTORY Changes from Revision A (May 2013) to Revision B * 12 Page Changed layout of National Data Sheet to TI format .......................................................................................................... 11 Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: LM2772 PACKAGE OPTION ADDENDUM www.ti.com 23-Aug-2017 PACKAGING INFORMATION Orderable Device Status (1) LM2772SD/NOPB ACTIVE Package Type Package Pins Package Drawing Qty WSON DSC 10 1000 Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM Op Temp (C) Device Marking (4/5) -30 to 85 L2772 (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 <=1000ppm threshold. Antimony trioxide based flame retardants must also meet the <=1000ppm threshold requirement. (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. 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Addendum-Page 1 Samples PACKAGE MATERIALS INFORMATION www.ti.com 24-Aug-2017 TAPE AND REEL INFORMATION *All dimensions are nominal Device LM2772SD/NOPB Package Package Pins Type Drawing WSON DSC 10 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 1000 178.0 12.4 Pack Materials-Page 1 3.3 B0 (mm) K0 (mm) P1 (mm) 3.3 1.0 8.0 W Pin1 (mm) Quadrant 12.0 Q1 PACKAGE MATERIALS INFORMATION www.ti.com 24-Aug-2017 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM2772SD/NOPB WSON DSC 10 1000 210.0 185.0 35.0 Pack Materials-Page 2 MECHANICAL DATA DSC0010A SDA10A (Rev A) www.ti.com 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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