LP3893 www.ti.com SNVS237B - SEPTEMBER 2003 - REVISED APRIL 2013 LP3893 3A Fast-Response Ultra Low Dropout Linear Regulators Check for Samples: LP3893 FEATURES DESCRIPTION * * * * * * * * The LP3893 is a high-current, fast-response regulator which can maintain output voltage regulation with minimum input to output voltage drop. Fabricated on a CMOS process, the device operates from two input voltages: Vbias provides voltage to drive the gate of the N-MOS power transistor, while Vin is the input voltage which supplies power to the load. The use of an external bias rail allows the part to operate from ultra low Vin voltages. Unlike bipolar regulators, the CMOS architecture consumes extremely low quiescent current at any output load current. The use of an N-MOS power transistor results in wide bandwidth, yet minimum external capacitance is required to maintain loop stability. 1 2 Ultra Low Dropout Voltage (270 mV at 3A typ) Low Ground Pin Current Load Regulation of 0.04%/A 60 nA Typical Quiescent Current in Shutdown 1.5% Output Accuracy (25C) TO-220, DDPAK/TO-263 Packages Over Temperature/Over Current Protection -40C to +125C Junction Temperature Range APPLICATIONS * * * * * * * DSP Power Supplies Server Core and I/O Supplies Linear Power Supplies for PC Add-in-Cards Set-Top Box Power Supplies Microprocessor Power Supplies High Efficiency Linear Power Supplies SMPS Post-Regulators The fast transient response of these devices makes them suitable for use in powering DSP, Microcontroller Core voltages and Switch Mode Power Supply post regulators. The parts are available in TO-220 and DDPAK/TO-263 packages. Dropout Voltage: 270 mV (typ) at 3A load current. Ground Pin Current: 3 mA (typ) at full load. Shutdown Current: 60 nA (typ) when S/D pin is low. Precision Output Voltage: 1.5% room temperature accuracy. TYPICAL APPLICATION CIRCUIT At least 10 F of input and output capacitance is required for stability. *Tantalum capacitors are recommended. Aluminum electrolytic capacitors may be used for restricted temperature range. See application hints. CONNECTION DIAGRAM Figure 1. TO-220, Top View Figure 2. DDPAK/TO-263, Top View 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) 2003-2013, Texas Instruments Incorporated LP3893 SNVS237B - SEPTEMBER 2003 - REVISED APRIL 2013 www.ti.com 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. BLOCK DIAGRAM ABSOLUTE MAXIMUM RATINGS (1) If Military/Aerospace specified devices are required, contact the Texas Instruments Sales Office/Distributors for availability and specifications. VALUE / UNITS -65C to +150C Storage Temperature Range Lead Temp. (Soldering, 5 seconds) 260C ESD Rating Human Body Model Machine Model (3) 2 kV 200V Power Dissipation (2) (4) Internally Limited VIN Supply Voltage (Survival) -0.3V to +6V VBIAS Supply Voltage (Survival) -0.3V to +7V Shutdown Input Voltage (Survival) -0.3V to +7V IOUT (Survival) Internally Limited -0.3V to +6V Output Voltage (Survival) -40C to +150C Junction Temperature (1) (2) (3) (4) Absolute maximum ratings indicate limits beyond which damage to the component may occur. Operating ratings indicate conditions for which the device is intended to be functional, but do not ensure specific performance limits. For specifications, see Electrical Characteristics. Specifications do not apply when operating the device outside of its rated operating conditions. The human body model is a 100 pF capacitor discharged through a 1.5k resistor into each pin. The machine model is a 220 pF capacitor discharged directly into each pin. The machine model ESD rating of pin 5 is 100V. At elevated temperatures, device power dissipation must be derated based on package thermal resistance and heatsink thermal values. J-A for TO-220 devices is 65C/W if no heatsink is used. If the TO-220 device is attached to a heatsink, a J-S value of 4C/W can be assumed. J-A for DDPAK/TO-263 devices is approximately 40C/W if soldered down to a copper plane which is at least 1.5 square inches in area. If power dissipation causes the junction temperature to exceed specified limits, the device will go into thermal shutdown. RECOMMENDED OPERATING CONDITIONS VALUE / UNITS VIN (VOUT + VDO) to 5.5V Shutdown 0 to +6V IOUT 3A -40C to +125C Junction Temperature VBIAS 2 4.5V to 6V Submit Documentation Feedback Copyright (c) 2003-2013, Texas Instruments Incorporated Product Folder Links: LP3893 LP3893 www.ti.com SNVS237B - SEPTEMBER 2003 - REVISED APRIL 2013 ELECTRICAL CHARACTERISTICS Limits in standard typeface are for TJ = 25C, and limits in boldface type apply over the full operating temperature range. Unless otherwise specified: VIN = VO(NOM) + 1V, VBIAS = 4.5V, IL = 10 mA, CIN = COUT =10 F, VS/D = VBIAS. Symbol VO Parameter Conditions 10 mA IL 3A VO(NOM) + 1V VIN 5.5V 4.5V VBIAS 6V Output Voltage Tolerance VO/VI Output Voltage Line Regulation (3) Typical (1) MIN (2) MAX (2) 1.216 1.198 1.186 1.234 1.246 1.5 1.478 1.455 1.522 1.545 1.8 1.773 1.746 1.827 1.854 Units V VO(NOM) + 1V VIN 5.5V 0.01 %/V 10 mA IL 3A 0.04 0.06 %/A IL = 3A 270 650 1000 mV 3 7 8 mA 0.03 1 30 A 1 2 3 mA VS/D 0.3V 0.03 1 30 A VOUT = 0V 6 N VO/IL Output Voltage Load Regulation (4) (5) VDO Dropout Voltage IQ(VIN) Quiescent Current Drawn from VIN Supply 10 mA IL 3A VS/D 0.3V IQ(VBIAS) ISC Quiescent Current Drawn from VBIAS Supply Short-Circuit Current 10 mA IL 3A A Shutdown Input VSDT Output Turn-off Threshold Output = ON 0.7 Output = OFF 0.7 Td (OFF) Turn-OFF Delay RLOAD X COUT << Td (OFF) 20 Td (ON) Turn-ON Delay RLOAD X COUT << Td (ON) 15 IS/D S/D Input Current VS/D =1.3V 1 VS/D 0.3V -1 VIN = VOUT +1V, f = 120 Hz 80 VIN = VOUT + 1V, f = 1 kHz 65 VBIAS = VOUT + 3V, f = 120 Hz 70 VBIAS = VOUT + 3V, f = 1 kHz 65 1.3 V 0.3 s A AC Parameters PSRR (VIN) Ripple Rejection for VIN Input Voltage PSRR (VBIAS) Ripple Rejection for VBIAS Voltage en (1) (2) (3) (4) (5) Output Noise Density f = 120 Hz Output Noise Voltage BW = 10 Hz - 100 kHz, VOUT = 1.8V 150 BW = 300 Hz - 300 kHz, VOUT = 1.8V 90 1 dB V/root- Hz V (rms) Typical numbers represent the most likely parametric norm for 25C operation. Limits are specified through testing, statistical correlation, or design. Output voltage line regulation is defined as the change in output voltage from nominal value resulting from a change in input voltage. Output voltage load regulation is defined as the change in output voltage from nominal value as the load current increases from no load to full load. Dropout voltage is defined as the minimum input to output differential required to maintain the output with 2% of nominal value. Submit Documentation Feedback Copyright (c) 2003-2013, Texas Instruments Incorporated Product Folder Links: LP3893 3 LP3893 SNVS237B - SEPTEMBER 2003 - REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise specified: Tj = 25C, COUT = 10 F, Cin = 10 F, S/D pin is tied to VBIAS, VIN = 2.2V, VOUT = 1.8V. 4 IGND vs VSD VOUT vs Temperature Figure 3. Figure 4. DC Load Regulation Line Regulation vs VIN Figure 5. Figure 6. Line Regulation vs VBIAS IBIAS vs IL Figure 7. Figure 8. Submit Documentation Feedback Copyright (c) 2003-2013, Texas Instruments Incorporated Product Folder Links: LP3893 LP3893 www.ti.com SNVS237B - SEPTEMBER 2003 - REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified: Tj = 25C, COUT = 10 F, Cin = 10 F, S/D pin is tied to VBIAS, VIN = 2.2V, VOUT = 1.8V. ILOAD vs Dropout Voltage DROPOUT VOLTAGE (V) 0.4 IGND vs VSD o 125 C 25oC 0.3 0.2 -40oC 0.1 0 0 1 2 3 3.5 ILOAD (A) Figure 9. Figure 10. Noise Measurement VOUTStartup Waveform Figure 11. Figure 12. VOUTStartup Waveform VOUTStartup Waveform Figure 13. Figure 14. Submit Documentation Feedback Copyright (c) 2003-2013, Texas Instruments Incorporated Product Folder Links: LP3893 5 LP3893 SNVS237B - SEPTEMBER 2003 - REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified: Tj = 25C, COUT = 10 F, Cin = 10 F, S/D pin is tied to VBIAS, VIN = 2.2V, VOUT = 1.8V. 6 Line Regulation vs VBIAS Line Regulation vs VBIAS Figure 15. Figure 16. VIN PSRR VIN PSRR Figure 17. Figure 18. VBIAS PSRR VBIAS PSRR Figure 19. Figure 20. Submit Documentation Feedback Copyright (c) 2003-2013, Texas Instruments Incorporated Product Folder Links: LP3893 LP3893 www.ti.com SNVS237B - SEPTEMBER 2003 - REVISED APRIL 2013 Application Hints EXTERNAL CAPACITORS To assure regulator stability, input and output capacitors are required as shown in the Typical Application Circuit. OUTPUT CAPACITOR At least 10F of output capacitance is required for stability (the amount of capacitance can be increased without limit). The output capacitor must be located less than 1 cm from the output pin of the IC and returned to a clean analog ground. The ESR (equivalent series resistance) of the output capacitor must be within the "stable" range as shown in the graph below over the full operating temperature range for stable operation. 10 COUT ESR (:) 1.0 COUT = 10PF STABLE REGION 0.1 COUT = 100PF .01 .001 0 1 2 3 LOAD CURRENT (A) Figure 21. Minimum ESR vs Output Load Current Tantalum capacitors are recommended for the output as their ESR is ideally suited to the part's requirements and the ESR is very stable over temperature. Aluminum electrolytics are not recommended because their ESR increases very rapidly at temperatures below 10C. Aluminum caps can only be used in applications where lower temperature operation is not required. A second problem with Al caps is that many have ESR's which are only specified at low frequencies. The typical loop bandwidth of a linear regulator is a few hundred kHz to several MHz. If an Al cap is used for the output cap, it must be one whose ESR is specified at a frequency of 100 kHz or more. Because the ESR of ceramic capacitors is only a few milli Ohms, they are not suitable for use as output capacitors on LP389X devices. The regulator output can tolerate ceramic capacitance totaling up to 15% of the amount of Tantalum capacitance connected from the output to ground. INPUT CAPACITOR The input capacitor must be at least 10 F, but can be increased without limit. It's purpose is to provide a low source impedance for the regulator input. Ceramic capacitors work best for this, but Tantalums are also very good. There is no ESR limitation on the input capacitor (the lower, the better). Aluminum electrolytics can be used, but their ESR increase very quickly at cold temperatures. They are not recommended for any application where temperatures go below about 10C. BIAS CAPACITOR The 0.1F capacitor on the bias line can be any good quality capacitor (ceramic is recommended). BIAS VOLTAGE The bias voltage is an external voltage rail required to get gate drive for the N-FET pass transistor. Bias voltage must be in the range of 4.5 - 6V to assure proper operation of the part. UNDER VOLTAGE LOCKOUT The bias voltage is monitored by a circuit which prevents the regulator output from turning on if the bias voltage is below approximately 4V. Submit Documentation Feedback Copyright (c) 2003-2013, Texas Instruments Incorporated Product Folder Links: LP3893 7 LP3893 SNVS237B - SEPTEMBER 2003 - REVISED APRIL 2013 www.ti.com SHUTDOWN OPERATION Pulling down the shutdown (S/D) pin will turn-off the regulator. Pin S/D must be actively terminated through a pull-up resistor (10 k to 100 k) for a proper operation. If this pin is driven from a source that actively pulls high and low (such as a CMOS rail to rail comparator), the pull-up resistor is not required. This pin must be tied to Vin if not used. POWER DISSIPATION/HEATSINKING A heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of the application. Under all possible conditions, the junction temperature must be within the range specified under operating conditions. The total power dissipation of the device is given by: PD = (VIN-VOUT)IOUT+ (VIN)IGND (1) where IGND is the operating ground current of the device. The maximum allowable temperature rise (TRmax) depends on the maximum ambient temperature (TAmax) of the application, and the maximum allowable junction temperature (TJmax): TRmax = TJmax- TAmax (2) The maximum allowable value for junction to ambient Thermal Resistance, JA, can be calculated using the formula: JA = TRmax / PD (3) These parts are available in TO-220 and DDPAK/TO-263 packages. The thermal resistance depends on amount of copper area or heat sink, and on air flow. If the maximum allowable value of JA calculated above is 60C/W for TO-220 package and 60C/W for DDPAK/TO-263 package no heatsink is needed since the package can dissipate enough heat to satisfy these requirements. If the value for allowable JA falls below these limits, a heat sink is required. HEATSINKING TO-220 PACKAGE The thermal resistance of a TO-220 package can be reduced by attaching it to a heat sink or a copper plane on a PC board. If a copper plane is to be used, the values of JA will be same as shown in next section for DDPAK/TO-263 package. The heatsink to be used in the application should have a heatsink to ambient thermal resistance, HA JA - CH - JC. (4) In this equation, CH is the thermal resistance from the case to the surface of the heat sink and JC is the thermal resistance from the junction to the surface of the case. JC is about 3C/W for a TO-220 package. The value for CH depends on method of attachment, insulator, etc. CH varies between 1.5C/W to 2.5C/W. If the exact value is unknown, 2C/W can be assumed. HEATSINKING DDPAK/TO-263 PACKAGE The DDPAK/TO-263 package uses the copper plane on the PCB as a heatsink. The tab of these packages are soldered to the copper plane for heat sinking. The graph below shows a curve for the JA of DDPAK/TO-263 package for different copper area sizes, using a typical PCB with 1 ounce copper and no solder mask over the copper area for heat sinking. 8 Submit Documentation Feedback Copyright (c) 2003-2013, Texas Instruments Incorporated Product Folder Links: LP3893 LP3893 www.ti.com SNVS237B - SEPTEMBER 2003 - REVISED APRIL 2013 Figure 22. JA vs Copper (1 Ounce) Area for DDPAK/TO-263 Package As shown in the graph below, increasing the copper area beyond 1 square inch produces very little improvement. The minimum value for JA for the DDPAK/TO-263 package mounted to a PCB is 32C/W. Figure 23 shows the maximum allowable power dissipation for DDPAK/TO-263 packages for different ambient temperatures, assuming JA is 35C/W and the maximum junction temperature is 125C. Figure 23. Maximum Power Dissipation vs Ambient Temperature for DDPAK/TO-263 Package Submit Documentation Feedback Copyright (c) 2003-2013, Texas Instruments Incorporated Product Folder Links: LP3893 9 LP3893 SNVS237B - SEPTEMBER 2003 - REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision A (April 2013) to Revision B * 10 Page Changed layout of National Data Sheet to TI format ............................................................................................................ 9 Submit Documentation Feedback Copyright (c) 2003-2013, Texas Instruments Incorporated Product Folder Links: LP3893 PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 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) LP3893ES-1.2 NRND DDPAK/ TO-263 KTT 5 45 TBD Call TI Call TI -40 to 125 LP3893ES -1.2 LP3893ES-1.2/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LP3893ES -1.2 LP3893ESX-1.2/NOPB ACTIVE DDPAK/ TO-263 KTT 5 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LP3893ES -1.2 (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. 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Addendum-Page 2 PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device LP3893ESX-1.2/NOPB Package Package Pins Type Drawing SPQ DDPAK/ TO-263 500 KTT 5 Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 330.0 24.4 Pack Materials-Page 1 10.75 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 14.85 5.0 16.0 24.0 Q2 PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LP3893ESX-1.2/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 Pack Materials-Page 2 MECHANICAL DATA KTT0005B TS5B (Rev D) BOTTOM SIDE OF PACKAGE 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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