LM34922 www.ti.com SNVS813A - JUNE 2012 - REVISED MARCH 2013 LM34922 28V, 2A Constant On-Time Switching Regulator with Adjustable Current Limit Check for Samples: LM34922 FEATURES 1 * * * * 2 * * * * * * Input Operating Voltage Range: 6V to 28V Absolute Maximum Input Rating: 30V Integrated 2A N-Channel Buck Switch Adjustable Current Limit Allows for Smaller Inductor Adjustable Output Voltage from 2.51V Minimum Ripple Voltage at VOUT Power Good Output Switching Frequency Adjustable to 1MHz COT Topology Features: - Switching Frequency Remains Nearly Constant with Load Current and Input Voltage Variations - Ultra-Fast Transient Response - No Loop Compensation Required - Stable Operation with Ceramic Output Capacitors - Allows for Smaller Output Capacitor and Current Sense Resistor Adjustable Soft-Start Timing * * Thermal Shutdown Precision 2% Feedback Reference DESCRIPTION The LM34922 Constant On-time Step-Down Switching Regulator features all the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying up to 2A of load current. This voltage regulator contains an N-Channel Buck switch, a startup regulator, current limit detection, and internal ripple control. The constant on-time regulation principle requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. The operating frequency remains constant with line and load. The adjustable valley current limit detection results in a smooth transition from constant voltage to constant current mode when current limit is reached, without the use of current limit foldback. The PGD output indicates the output voltage has increased to within 5% of the expected regulation value. Additional features include: Low output ripple, VIN under-voltage lockout, adjustable soft-start timing, thermal shutdown, gate drive pre-charge, gate drive under-voltage lockout, and maximum duty cycle limit. Typical Application, Basic Step-Down Regulator 6V to 28V Input VIN BST CBST LM34922 CIN RT SW D1 RT VOUT CS RPGD VPGD Power Good L1 RS PGD CSG COUT RFB2 SS CSS SGND FB RFB1 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) 2012-2013, Texas Instruments Incorporated LM34922 SNVS813A - JUNE 2012 - REVISED MARCH 2013 www.ti.com Connection Diagram Exposed Pad on Bottom Connect to Ground VIN 1 10 BST RT 2 9 SW PGD 3 8 CS SS 4 7 CSG SGND 5 6 FB Figure 1. Top View 10-Lead HVSSOP-PowerPAD PIN DESCRIPTIONS Pin No. Name Description 1 VIN Input supply voltage Application Information 2 RT On-time Control An external resistor from VIN to this pin sets the buck switch on-time, and the switching frequency. 3 PGD Power Good Logic output indicates when the voltage at the FB pin has increased to above 95% of the internal reference voltage. Hysteresis is provided. An external pull-up resistor to a voltage less than 7V is required. 4 SS Soft-Start 5 SGND Signal Ground 6 FB Feedback Internally connected to the regulation comparator. The regulation level is 2.51V. 7 CSG Current Sense Ground Ground connection for the current limit sensing circuit. Connect to ground and to the current sense resistor. 8 CS Current sense Connect to the current sense resistor and the anode of the free-wheeling diode. 9 SW Switching Node 10 BST Bootstrap capacitor connection of the buck switch gate driver. Operating input range is 6V to 28V. Transient capability is 30V. A low ESR capacitor must be placed as close as possible to the VIN and SGND pins. An internal current source charges an external capacitor to provide the softstart function. Ground for all internal circuitry other than the current limit sense circuit. Internally connected to the buck switch source. Connect to the external inductor, cathode of the free-wheeling diode, and bootstrap capacitor. Connect a 0.1F capacitor from SW to this pin. The capacitor is charged during the buck switch off-time via an internal diode. 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) 2012-2013, Texas Instruments Incorporated Product Folder Links: LM34922 LM34922 www.ti.com SNVS813A - JUNE 2012 - REVISED MARCH 2013 Absolute Maximum Ratings (1) (2) (3) VIN to SGND (TJ = 25C) 30V BST to SGND 37V SW to SGND (Steady State) -1.5V to 30V BST to SW -0.3V to 7V CS to CSG -0.3V to 0.3V CSG to SGND -0.3V to 0.3V PGD to SGND -0.3V to 7V SS to SGND -0.3V to 3V RT to SGND -0.3V to 1V FB to SGND -0.3V to 7V ESD Rating (4) Human Body Model 2kV Storage Temperature Range -65C to +150C For soldering specs see: SNOA549C Junction Temperature (1) (2) (3) (4) 150C Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is intended to be functional. For specifications and test conditions, see the Electrical Characteristics. If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications. Current flow out of a pin is indicated as a negative number. The human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin. Operating Ratings (1) VIN Voltage 6.0V to 28V Junction Temperature (1) -40C to +125C Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is intended to be functional. For specifications and test conditions, see the Electrical Characteristics. Electrical Charateristics Specifications with standard type are for TJ = 25C only; limits in boldface type apply over the full Operating Junction Temperature (TJ) range. Minimum and Maximum limits are specified through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25C, and are provided for reference purposes only. Unless otherwise stated the following conditions apply: VIN = 12V, RT = 50k. Symbol Parameter Conditions Input operating current Non-switching, FB = 3V VIN under-voltage lock-out threshold VIN Increasing Min Typ Max Units 1200 1600 A 5.3 5.9 V Input (VIN Pin) IIN UVLOVIN 4.6 VIN under-voltage lock-out threshold hysteresis 200 mV Switch Characteristics RDS(ON) Buck Switch RDS(ON) ITEST = 200mA UVLOGD Gate Drive UVLO BST-SW 2.4 UVLOGD Hysteresis Pre-charge switch voltage 0.3 0.6 3.4 4.4 350 ITEST = 10mA into SW pin V mV 1.4 V Pre-charge switch on-time 120 ns VSS Pull-up voltage 2.51 V ISS Internal current source Soft-Start Pin VSS-SH Shutdown Threshold 70 10 A 140 mV Current Limit Submit Documentation Feedback Copyright (c) 2012-2013, Texas Instruments Incorporated Product Folder Links: LM34922 3 LM34922 SNVS813A - JUNE 2012 - REVISED MARCH 2013 www.ti.com Electrical Charateristics (continued) Specifications with standard type are for TJ = 25C only; limits in boldface type apply over the full Operating Junction Temperature (TJ) range. Minimum and Maximum limits are specified through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25C, and are provided for reference purposes only. Unless otherwise stated the following conditions apply: VIN = 12V, RT = 50k. Symbol VILIM Parameter Conditions Threshold voltage at CS Min Typ Max Units -146 -130 -115 mV CS bias current FB = 3V -120 A CSG bias current FB = 3V -35 A tON - 1 On-time VIN = 12V, RT = 50k tON - 2 On-time (current limit) VIN = 12V, RT = 50k tON - 3 On-time VIN = 12V, RT = 301k tON - 4 On-time VIN = 9V, RT = 30.9k 130 171 215 ns tON - 5 On-time VIN = 12V, RT = 30.9k 105 137 170 ns tON - 6 On-time VIN = 16V, RT = 30.9k 79 109 142 ns 90 150 208 ns 2.46 2.51 2.56 On Timer, RT Pin 150 200 250 100 ns ns 1020 ns Off Timer tOFF Minimum Off-time (LM34922) Regulation Comparator (FB Pin) VREF FB regulation threshold SS pin = steady state FB bias current FB = 3V V 100 nA 95 % Power Good (PGD pin) Threshold at FB, with respect to VREF FB increasing 91 Threshold hysteresis 3.3 % PGDVOL Low state voltage IPGD = 1mA, FB = 0V 125 180 mV PGDLKG Off state leakage VPGD = 7V, FB = 3V 0.1 A Thermal shutdown Junction temperature increasing 155 C 20 C 48 C/W 10 C/W Thermal Shutdown TSD Thermal shutdown hysteresis Thermal Resistance (1) 4 JA Junction to Ambient, 0 LFPM Air Flow JC (1) Junction to Case, (1) JEDEC test board description can be found in JESD 51-5 and JESD 51-7. Submit Documentation Feedback Copyright (c) 2012-2013, Texas Instruments Incorporated Product Folder Links: LM34922 LM34922 www.ti.com SNVS813A - JUNE 2012 - REVISED MARCH 2013 Typical Performance Characteristics Efficiency (Circuit of Figure 19) On-Time vs VIN and RT 10000 RT = 500k ON-TIME (ns) 300k 1000 50k 100 100k 200k 10 0 5 10 15 20 25 30 VIN (V) Figure 2. Figure 3. Voltage at the RT Pin Shutdown Current into VIN Figure 4. Figure 5. Operating Current into VIN PGD Low Voltage vs. Sink Current Figure 6. Figure 7. Submit Documentation Feedback Copyright (c) 2012-2013, Texas Instruments Incorporated Product Folder Links: LM34922 5 LM34922 SNVS813A - JUNE 2012 - REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) 6 Reference Voltage vs. Temperature Current Limit Threshold vs. Temperature Figure 8. Figure 9. Operating Current vs. Temperature VIN UVLO vs. Temperature Figure 10. Figure 11. SS Pin ShutdownThreshold vs. Temperature On-Time vs. Temperature Figure 12. Figure 13. Submit Documentation Feedback Copyright (c) 2012-2013, Texas Instruments Incorporated Product Folder Links: LM34922 LM34922 www.ti.com SNVS813A - JUNE 2012 - REVISED MARCH 2013 Typical Performance Characteristics (continued) Minimum Off-Time vs. Temperature (LM34922) Figure 14. Submit Documentation Feedback Copyright (c) 2012-2013, Texas Instruments Incorporated Product Folder Links: LM34922 7 LM34922 SNVS813A - JUNE 2012 - REVISED MARCH 2013 www.ti.com Block Diagram 6V to 28V LM34922 VIN 5V REGULATOR Input CIN CBYP UVLO CL RT THERMAL SHUTDOWN OFF TIMER ON TIMER RT FINISH START START FINISH BST 2.5V Gate Drive 10 PA SD UVLO VIN CBST SS LOGIC CSS LEVEL SHIFT L1 + FB CL REGULATION COMPARATOR VOUT SW FCIC CONTROL CURRENT LIMIT COMPARATOR D1 + COUT Pre - Chg - RFB2 CS RPGD Power Good 0.8V PGD CURRENT LIMIT THRESHOLD SGND + + 125 mV RS CSG 2.375V RFB2 WHITE SPACE UVLO VIN SW Pin Inductor Current SS Pin VOUT PGD t1 Figure 15. Startup Sequence 8 Submit Documentation Feedback Copyright (c) 2012-2013, Texas Instruments Incorporated Product Folder Links: LM34922 LM34922 www.ti.com SNVS813A - JUNE 2012 - REVISED MARCH 2013 FUNCTIONAL DESCRIPTION The LM34922 Constant On-time Step-down Switching Regulator features all the functions needed to implement a low cost, efficient buck bias power converter capable of supplying up to 2.0A to the load. This high voltage regulator contains an N-Channel buck switch, is easy to implement, and is available in a 10-pin HVSSOPPowerPAD power enhanced package. The regulator's operation is based on a constant on-time control principle with the on-time inversely proportional to the input voltage. This feature results in the operating frequency remaining relatively constant with load and input voltage variations. The constant on-time feedback control principle requires no loop compensation resulting in very fast load transient response. The adjustable valley current limit detection results in a smooth transition from constant voltage to constant current when current limit is reached. To aid in controlling excessive switch current due to a possible saturating inductor the on-time is reduced by 40% when current limit is detected. The Power Good output (PGD pin) indicates when the output voltage is within 5% of the expected regulation voltage. The LM34922 can be implemented to efficiently step-down higher voltages in non-isolated applications. Additional features include: Low output ripple, VIN under-voltage lock-out, adjustable soft-start timing, thermal shutdown, gate drive pre-charge, gate drive under-voltage lock-out, and maximum duty cycle limit. Control Circuit Overview The LM34922 buck regulator employs a control principle based on a comparator and a one-shot on-timer, with the output voltage feedback (FB) compared to an internal reference (2.51V). If the FB voltage is below the reference the internal buck switch is switched on for the one-shot timer period, which is a function of the input voltage and the programming resistor (RT). Following the on-time the switch remains off until the FB voltage falls below the reference, but never less than the minimum off-time forced by the off-time one-shot timer. When the FB pin voltage falls below the reference and the off-time one-shot period expires, the buck switch is then turned on for another on-time one-shot period. When in regulation, the LM34922 operates in continuous conduction mode at heavy load currents and discontinuous conduction mode at light load currents. In continuous conduction mode the inductor's current is always greater than zero, and the operating frequency remains relatively constant with load and line variations. The minimum load current for continuous conduction mode is one-half the inductor's ripple current amplitude. The approximate operating frequency is calculated as follows: VOUT FS = -11 (4.1 x 10 x (RT + 0.5k)) + (VIN x 15 ns) (1) The buck switch duty cycle is approximately equal to: DC = tON VOUT = tON x FS = tON + tOFF VIN (2) When the load current is less than one half the inductor's ripple current amplitude the circuit operates in discontinuous conduction mode. The off-time is longer than in continuous conduction mode while the inductor current is zero, causing the switching frequency to reduce as the load current is reduced. Conversion efficiency is maintained at light loads since the switching losses are reduced with the reduction in load and frequency. The approximate discontinuous operating frequency can be calculated as follows: FS = VOUT2 x L1 x 1.19 x 1021 2 RL x R T where * * RL = the load resistance L1 is the circuit's inductor (3) The output voltage is set by the two feedback resistors (RFB1, RFB2 in the Block Diagram). The regulated output voltage is calculated as follows: VOUT = 2.51V x (RFB1 + RFB2) / RFB1 (4) Submit Documentation Feedback Copyright (c) 2012-2013, Texas Instruments Incorporated Product Folder Links: LM34922 9 LM34922 SNVS813A - JUNE 2012 - REVISED MARCH 2013 www.ti.com Ripple voltage, which is required at the input of the regulation comparator for proper output regulation, is generated internally in the LM34922. In the LM34922 the ERM (Emulated Ripple Mode) control circuit generates the required internal ripple voltage from the ripple waveform at the CS pin. On-Time Timer The on-time for the LM34922 is determined by the RT resistor and the input voltage (VIN), calculated from: tON = 4.1 x 10 -11 x (RT + 500:) (VIN) + 15 ns (5) The inverse relationship with VIN results in a nearly constant frequency as VIN is varied. To set a specific continuous conduction mode switching frequency (FS), the RT resistor is determined from the following: VOUT - (VIN x FS x 15 ns) - 500: RT = -11 FS x 4.1 x 10 (6) The on-time must be chosen greater than 90ns for proper operation. Equation 1, Equation 5 and Equation 6 are valid only during normal operation - i.e., the circuit is not in current limit. When the LM34922 operates in current limit, the on-time is reduced by 40%. This feature reduces the peak inductor current which may be excessively high if the load current and the input voltage are simultaneously high. This feature operates on a cycle-by-cycle basis until the load current is reduced and the output voltage resumes its normal regulated value. The maximum continuous current into the RT pin must be less than 2mA. For high frequency applications, the maximum switching frequency is limited at the maximum input voltage by the minimum on-time one-shot period (90ns). At minimum input voltage the maximum switching frequency is limited by the minimum off-time one-shot period, which, if reached, prevents achievement of the proper duty cycle. Current Limit Current limit detection occurs during the off-time by monitoring the voltage across the external current sense resistor RS. Referring to the Block Diagram, during the off-time the recirculating current flows through the inductor, through the load, through the sense resistor, and through D1 to the inductor. If the voltage across the sense resistor exceeds the threshold (VILIM) the current limit comparator output switches to delay the start of the next on-time period. The next on-time starts when the recirculating current decreases such that the voltage across RS reduces to the threshold and the voltage at FB is below 2.51V. The operating frequency is typically lower due to longer-than-normal off-times. When current limit is detected, the on-time is reduced by 40% if the voltage at the FB pin is below its threshold when the voltage across RS reduces to its threshold (VOUT is low due to current limiting). Figure 16 illustrates the inductor current waveform during normal operation and in current limit. During the first "Normal Operation" the load current is I01, the average of the inductor current waveform. As the load resistance is reduced, the inductor current increases until the lower peak of the inductor ripple current exceeds the threshold. During the "Current Limited" portion of Figure 16, each on-time is reduced by 40%, resulting in lower ripple amplitude for the inductor's current. During this time the LM34922 is in a constant current mode with an average load current equal to the current limit threshold plus half the ripple amplitude (IOCL), and the output voltage is below the normal regulated value. Normal operation resumes when the load current is reduced (to IO2), allowing VOUT and the on-time to return to their normal values. Note that in the second period of "Normal Operation", even though the inductor's peak current exceeds the current limit threshold during part of each cycle, the circuit is not in current limit since the inductor current falls below the current limit threshold during each off time. The peak current allowed through the buck switch is 3.5A, and the maximum allowed average current is 2.0A. 10 Submit Documentation Feedback Copyright (c) 2012-2013, Texas Instruments Incorporated Product Folder Links: LM34922 LM34922 www.ti.com SNVS813A - JUNE 2012 - REVISED MARCH 2013 IPK IOCL Current Limit Threshold IO2 'I Inductor Current IO1 0V Voltage at the CS Pin Voltage at the FB Pin 2.51V Load Current Increases Normal Operation Current Limited Load Current Decreases Normal Operation Figure 16. Normal and Current Limit Operation Ripple Requirements The LM34922 requires a minimum of 15mVp-p ripple voltage at the CS pin. That ripple voltage is generated by the decreasing recirculating current (the inductor's ripple current) through RS during the off-time. See Figure 17. Inductor Current 'I 0V Voltage at CS VRIPPLE tON tOFF (3a) Figure 17. CS Pin Waveform The ripple voltage is equal to: VRIPPLE = I x RS where * * I is the inductor current ripple amplitude RS is the current sense resistor at the CS pin (7) N-Channel Buck Switch and Driver The LM34922 integrates an N-Channel buck switch and associated floating high voltage gate driver. The gate driver circuit works in conjunction with an external bootstrap capacitor (CBST) and an internal high voltage diode. A 0.1F capacitor connected between BST and SW provides the supply voltage for the driver during the on-time. During each off-time, the SW pin is at approximately -1V, and CBST is recharged from the internal 5V regulator for the next on-time. The minimum off-time ensures a sufficient time each cycle to recharge the bootstrap capacitor. Submit Documentation Feedback Copyright (c) 2012-2013, Texas Instruments Incorporated Product Folder Links: LM34922 11 LM34922 SNVS813A - JUNE 2012 - REVISED MARCH 2013 www.ti.com Soft-Start The soft-start feature allows the converter to gradually reach a steady state operating point, thereby reducing startup stresses and current surges. Upon turn-on, when VIN reaches its under-voltage lock-out threshold an internal 10A current source charges the external capacitor at the SS pin to 2.51V (t1 in Figure 15). The ramping voltage at SS ramps the non-inverting input of the regulation comparator, and the output voltage, in a controlled manner. For proper operation, the soft-start capacitor should be no smaller than 1000pF. The LM34922 can be employed as a tracking regulator by applying the controlling voltage to the SS pin. The regulator's output voltage tracks the applied voltage, gained up by the ratio of the feedback resistors. The applied voltage at the SS pin must be within the range of 0.5V to 2.6V. The absolute maximum rating for the SS pin is 3.0V. If the tracking function causes the voltage at the FB pin to go below the thresholds for the PGD pin, the PGD pin will switch low (see the Power Good Output (PGD) section). An internal switch grounds the SS pin if the input voltage at VIN is below its under-voltage lock-out threshold or if the Thermal Shutdown activates. If the tracking function (described above) is used, the tracking voltage applied to the SS pin must be current limited to a maximum of 1mA. Shutdown Function The SS pin can be used to shutdown the LM34922 by grounding the SS pin as shown in Figure 18. Releasing the pin allows normal operation to resume. SS STOP LM34922 CSS RUN Figure 18. Shutdown Implemetation Power Good Output (PGD) The Power Good output (PGD) indicates when the voltage at the FB pin is close to the internal 2.51V reference voltage. The rising threshold at the FB pin for the PGD output to switch high is 95% of the internal reference. The falling threshold for the PGD output to switch low is approximately 3.3% below the rising threshold. The PGD pin is internally connected to the drain of an N-channel MOSFET switch. An external pull-up resistor (RPGD), connected to an appropriate voltage not exceeding 7V, is required at PGD to indicate the LM34922's status to other circuitry. When PGD is low, the pin's voltage is determined by the current into the pin. See the graph " PGD Low Voltage vs. Sink Current". Upon powering up the LM34922, the PGD pin is high until the voltage at VIN reaches 2V, at which time PGD switches low. As VIN is increased PGD stays low until the output voltage takes the voltage at the FB pin above 95% of the internal reference voltage, at which time PGD switches high. As VIN is decreased (during shutdown) PGD remains high until either the voltage at the FB pin falls below 92% of the internal reference, or when VIN falls below its lower UVLO threshold, whichever occurs first. PGD then switches low, and remains low until VIN falls below 2V, at which time PGD switches high. If the LM34922 is used as a tracking regulator (see the SoftStart section), the PGD output is high as long as the voltage at the FB pin is above the thresholds mentioned above. Thermal Shutdown The LM34922 should be operated so the junction temperature does not exceed 125C. If the junction temperature increases above that, an internal Thermal Shutdown circuit activates (typically) at 155C, taking the controller to a low power reset state by disabling the buck switch and taking the SS pin to ground. This feature helps prevent catastrophic failures from accidental device overheating. When the junction temperature reduces below 135C (typical hysteresis = 20C) normal operation resumes. 12 Submit Documentation Feedback Copyright (c) 2012-2013, Texas Instruments Incorporated Product Folder Links: LM34922 LM34922 www.ti.com SNVS813A - JUNE 2012 - REVISED MARCH 2013 8V to 28V Input RT 118 k: CIN 4.7 PF CBYP 0.1 PF BST VIN CBST 0.1 PF L1 10 PH LM34922 SW RT VOUT D1 5V VPGD CS RPGD 10 k: Power Good COUT 10 PF RS 80 m: PGD CSG RFB2 4.99 k: SS CSS 0.022 PF SGND FB RFB1 4.99 k: Figure 19. Example Circuit Figure 20. Efficiency (Circuit of Figure 19) Figure 21. Frequency vs VIN (Circuit of Figure 19) Submit Documentation Feedback Copyright (c) 2012-2013, Texas Instruments Incorporated Product Folder Links: LM34922 13 LM34922 SNVS813A - JUNE 2012 - REVISED MARCH 2013 www.ti.com REVISION HISTORY Changes from Original (March 2013) to Revision A * 14 Page Changed layout of National Data Sheet to TI format .......................................................................................................... 13 Submit Documentation Feedback Copyright (c) 2012-2013, Texas Instruments Incorporated Product Folder Links: LM34922 PACKAGE OPTION ADDENDUM www.ti.com 3-Dec-2016 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) LM34922MY/NOPB ACTIVE MSOPPowerPAD DGQ 10 1000 Green (RoHS & no Sb/Br) CU SN Level-3-260C-168 HR -40 to 125 SA8B LM34922MYX/NOPB ACTIVE MSOPPowerPAD DGQ 10 3500 Green (RoHS & no Sb/Br) CU SN Level-3-260C-168 HR -40 to 125 SA8B (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) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. Addendum-Page 1 Samples PACKAGE OPTION ADDENDUM www.ti.com 3-Dec-2016 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. Addendum-Page 2 PACKAGE MATERIALS INFORMATION www.ti.com 20-Sep-2016 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LM34922MY/NOPB MSOPPower PAD DGQ 10 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 LM34922MYX/NOPB MSOPPower PAD DGQ 10 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 20-Sep-2016 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM34922MY/NOPB MSOP-PowerPAD DGQ 10 1000 210.0 185.0 35.0 LM34922MYX/NOPB MSOP-PowerPAD DGQ 10 3500 367.0 367.0 35.0 Pack Materials-Page 2 MECHANICAL DATA DGQ0010A MUC10A (Rev A) BOTTOM VIEW www.ti.com IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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