REG101 REG 101 SBVS026D - JULY 2001 - REVISED SEPTEMBER 2005 DMOS 100mA Low-Dropout Regulator FEATURES DESCRIPTION NEW DMOS TOPOLOGY: Ultra Low Dropout Voltage: 60mV typ at 100mA Output capacitor NOT required for stability FAST TRANSIENT RESPONSE VERY LOW NOISE: 23Vrms The REG101 is a family of low-noise, low-dropout linear regulators with low ground pin current. Its new DMOS topology provides significant improvement over previous designs, including low dropout voltage (only 60mV typ at full load), and better transient performance. In addition, no output capacitor is required for stability, unlike conventional low-dropout regulators that are difficult to compensate and require expensive low ESR capacitors greater than 1F. Typical ground pin current is only 500A (at IOUT = 100mA) and drops to 10nA when not in enabled mode. Unlike regulators with PNP pass devices, quiescent current remains relatively constant over load variation and under dropout conditions. The REG101 has very low output noise (typically 23Vrms for VOUT = 3.3V with CNR = 0.01F), making it ideal for use in portable communications equipment. Accuracy is maintained over temperature, line, and load variations. Key parameters are tested over the specified temperature range (-40C to +85C). The REG101 is well protected--internal circuitry provides a current limit that protects the load from damage. Thermal protection circuitry keeps the chip from being damaged by excessive temperature. The REG101 is available in the SOT23-5 and the SO-8 packages. HIGH ACCURACY: 1.5% max HIGH EFFICIENCY: IGND = 500A at IOUT = 100mA Not Enabled: IGND = 10nA 2.5V, 2.8V, 2.85V, 3.0V, 3.3V, 5.0V, AND ADJUSTABLE OUTPUT VERSIONS OTHER OUTPUT VOLTAGES AVAILABLE UPON REQUEST FOLDBACK CURRENT LIMIT THERMAL PROTECTION SMALL SURFACE-MOUNT PACKAGES: SOT23-5 and SO-8 APPLICATIONS PORTABLE COMMUNICATION DEVICES BATTERY-POWERED EQUIPMENT PERSONAL DIGITAL ASSISTANTS MODEMS BAR-CODE SCANNERS BACKUP POWER SUPPLIES Enable Enable VOUT VIN + 0.1F NR REG101 (Fixed Voltage Versions) + COUT(1) VIN VOUT + REG101-A + COUT(1) Adj Gnd NR = Noise Reduction 0.1F R1 Gnd R2 NOTE: (1) Optional. 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. Copyright (c) 2000-2005, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. www.ti.com ABSOLUTE MAXIMUM RATINGS(1) Supply Input Voltage, VIN ....................................................... -0.3V to 12V Enable Input Voltage, VEN ....................................................... -0.3V to VIN Feedback Voltage, VFB ........................................................ -0.3V to 6.0V NR Pin Voltage, VNR ............................................................. -0.3V to 6.0V Output Short-Circuit Duration ...................................................... Indefinite Operating Temperature Range (TJ) ................................ -55C to +125C Storage Temperature Range (TA) ................................... -65C to +150C Lead Temperature (soldering, 3s, SOT23-5, and SO-8) ..................... +240C NOTE: (1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade device reliability. ELECTROSTATIC DISCHARGE SENSITIVITY This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. PACKAGE/ORDERING INFORMATION(1) VOUT(2) PRODUCT REG101xx-yyyy/zzz XX is package designator. YYYY is typical output voltage (5 = 5.0V, 2.85 = 2.85V, A = Adjustable). ZZZ is package quantity. (1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at www.ti.com. (2) Output voltages from 2.5V to 5.1V in 50mV increments are available; minimum order quantities apply. Contact factory for details and availability. PIN CONFIGURATIONS Top View SO-8 SOT23-5 VOUT(2) 1 8 VIN(3) VIN 1 VOUT(2) 2 7 VIN(3) GND 2 NR/Adjust(1) 3 6 NC Enable 3 GND 4 5 Enable 5 VOUT 4 NR/Adjust(1) (N Package) (U Package) NOTE: (1) For REG101A-A: voltage setting resistor pin. All other models: noise reduction capacitor pin. (2) Both pin 1 and pin 2 must be connected. (3) Both pin 7 and pin 8 must be connected. 2 REG101 SBVS026D ELECTRICAL CHARACTERISTICS Boldface limits apply over the specified temperature range, TJ = -40C to +85C. At TJ = +25C, VIN = VOUT + 1V (VOUT = 2.5V for REG101-A), VENABLE = 1.8V, IOUT = 2mA, CNR = 0.01F, and COUT = 0.1F(1), unless otherwise noted. REG101NA REG101UA PARAMETER OUTPUT VOLTAGE Output Voltage REG101-2.5 REG101-2.8 REG101-2.85 REG101-3.0 REG101-3.3 REG101-5 REG101-A Reference Voltage Adjust Pin Current Accuracy Over Temperature vs Temperature Includes Line and Load Over Temperature DC DROPOUT VOLTAGE(2) For all models Over Temperature VOLTAGE NOISE Without CNR With CNR (all fixed voltage models) OUTPUT CURRENT Current Limit(3) Over Temperature Short-Circuit Current CONDITION 2.5 VREF IADJ TEMPERATURE RANGE Specified Range Operating Range Storage Range Thermal Resistance SOT23-5 Surface Mount SO-8 Surface Mount UNITS 50 0.8 IOUT = 2mA to 100mA, VIN = (VOUT + 0.4V) to 10V VIN = (VOUT + 0.6V) to 10V VDROP Vn IOUT = 2mA IOUT = 100mA IOUT = 100mA 4 60 f = 10Hz to 100kHz CNR = 0, COUT = 0 CNR = 0.01F, COUT = 10F ICL ISC IOUT = 100mA IENABLE 10 100 130 mV mV mV 1 1.5 2.2 2.0 Vrms Vrms 23Vrms/V * VOUT 7Vrms/V * VOUT 130 110 VENABLE 2.7 V V V V V V V V A % % ppm/C % % 5.5 1.267 0.2 0.5 dVOUT/dT 170 60 mA mA mA 65 dB 1.8 -0.2 VENABLE = 1.8V to VIN, VIN = 1.8V to 6.5(4) VENABLE = 0V to 0.5V COUT = 1.0F, RLOAD = 33 COUT = 1.0F, RLOAD = 33 1 2 200 1.5 220 240 VIN 0.5 100 100 IGND V V nA nA s ms C C 160 140 Enable Pin Low INPUT VOLTAGE Operating Input Voltage Range(5) Specified Input Voltage Range Over Temperature MAX 2.5 2.8 2.85 3.0 3.3 5 THERMAL SHUTDOWN Junction Temperature Shutdown Reset from Shutdown GROUND PIN CURRENT Ground Pin Current TYP VOUT RIPPLE REJECTION f = 120Hz ENABLE CONTROL VENABLE High (output enabled) VENABLE Low (output disabled) IENABLE High (output enabled) IENABLE Low (output disabled) Output Disable Time Output Enable Time MIN 500 650 0.2 A A A 1.8 VOUT + 0.4 VOUT + 0.6 10 10 10 V V V -40 -55 -65 +85 +125 +150 C C C IOUT = 2mA IOUT = 100mA VENABLE 0.5V 400 500 0.01 VIN VIN > 1.8V VIN > 1.8V TJ TJ TA JA JA Junction-to-Ambient Junction-to-Ambient 200 150 C/W C/W NOTES: (1) The REG101 does not require a minimum output capacitor for stability. However, transient response can be improved with proper capacitor selection. (2) Dropout voltage is defined as the input voltage minus the output voltage that produces a 2% change in the output voltage from the value at VIN = VOUT + 1V at fixed load. (3) Current limit is the output current that produces a 10% change in output voltage from VIN = VOUT + 1V and IOUT = 2mA. (4) For VENABLE > 6.5V, see typical characteristic "IENABLE vs VENABLE". (5) The REG101 no longer regulates when VIN < VOUT + VDROP (MAX). In drop-out, the impedance from VIN to VOUT is typically less than 1 at TJ = +25C. REG101 SBVS026D 3 TYPICAL CHARACTERISTICS For all models, at TJ = +25C and VENABLE = 1.8V, unless otherwise noted. OUTPUT VOLTAGE CHANGE vs IOUT (VIN = VOUT + 1V, Output Voltage % Change Referred to IOUT = 50mA at +25C) LOAD REGULATION vs TEMPERATURE (VIN = VOUT + 1V) 0.0% 0.80 Output Voltage Change (%) Output Voltage Change (%) 0.60 0.40 +25C 0.20 +125C 0.00 -0.20 -0.40 -55C -0.1% 10mA < IOUT < 100mA -0.2% -0.3% 2mA < IOUT < 1000mA -0.60 -0.80 0 10 20 30 40 50 60 70 80 90 -0.4% -50 100 -25 0 0.10 15 0.08 IOUT = 2mA 5 IOUT = 50mA 0 -5 -10 IOUT = 100mA -15 1 2 3 75 100 125 IOUT = 100mA 0.06 0.04 0.02 (VOUT + 1V) < VIN < 10V 0.00 -0.02 -0.04 -0.06 -0.08 -20 0 50 LINE REGULATION vs TEMPERATURE 20 Output Voltage Change (%) Output Voltage Change (mV) LINE REGULATION (Referred to VIN = VOUT + 1V at IOUT = 50mA) 10 25 Temperature (C) IOUT (mA) 4 5 6 7 8 -0.10 -50 (VOUT + 0.4V) < VIN < 10V -25 0 VIN - VOUT (V) 25 50 75 100 125 Temperature (C) DC DROPOUT VOLTAGE vs TEMPERATURE DC DROPOUT VOLTAGE vs IOUT 100 100 DC Dropout Voltage (mV) DC Dropout Voltage (mV) IOUT = 100mA 80 +125C 60 +25C 40 -55C 20 0 0 10 20 30 40 50 60 IOUT (mA) 4 70 80 90 100 80 60 40 20 0 -50 -25 0 25 50 75 100 125 Temperature (C) REG101 SBVS026D TYPICAL CHARACTERISTICS (Cont.) For all models, at TJ = +25C and VENABLE = 1.8V, unless otherwise noted. OUTPUT VOLTAGE ACCURACY HISTOGRAM OUTPUT VOLTAGE DRIFT HISTOGRAM 18 30 16 Percentage of Units (%) Percentage of Units (%) 25 14 12 10 8 6 4 20 15 10 5 2 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 1.0 0.8 0.6 0.4 0.2 0.0 -0.2 -0.4 -0.6 -0.8 -1.0 0 Error (%) VOUT Drift (ppm/C) OUTPUT VOLTAGE vs TEMPERATURE (Output Voltage % Change Referred to IOUT = 50mA at +25C) GROUND PIN CURRENT, NOT ENABLED vs TEMPERATURE 1 0.50 VENABLE = 0.5V VIN = VOUT + 1V 0.30 100n IOUT = 2mA 0.20 0.10 0.00 IGND (A) Output Voltage Change (%) 0.40 IOUT = 50mA -0.10 10n -0.20 1n -0.30 IOUT = 100mA -0.40 -0.50 -50 -25 0 25 50 75 100 100p -50 125 -25 0 25 50 75 100 125 Temperature (C) Temperature (C) GROUND PIN CURRENT vs IOUT GROUND PIN CURRENT vs TEMPERATURE 600 600 VOUT = 5V VOUT = 5.0V 500 IOUT = 100mA 575 550 VOUT = 3.3V 300 IGND (A) IGND (A) 400 VOUT = 2.5V 200 525 VOUT = 3.3V 500 475 450 VOUT = 2.5V 100 425 VIN = VOUT + 1V 0 0 10 20 30 40 50 IOUT (mA) REG101 SBVS026D 60 70 80 90 100 VIN = VOUT + 1V 400 -50 -25 0 25 50 75 100 125 Temperature (C) 5 TTYPICAL CHARACTERISTICS (Cont.) For all models, at TJ = +25C and VENABLE = 1.8V, unless otherwise noted. RIPPLE REJECTION vs FREQUENCY RIPPLE REJECTION vs (VIN - VOUT) 80 30 IOUT = 2mA REG101-3.3 25 IOUT = 2mA COUT = 10F 60 50 IOUT = 100mA Ripple Rejection (dB) Ripple Rejection (dB) 70 IOUT = 100mA COUT = 10F 40 30 20 COUT = 0F 10 20 15 10 Frequency = 100kHz COUT = 10F IOUT = 100mA 5 0 0 10 100 1k 10k 100k 1M 10M 0 0.1 0.2 0.3 Frequency (Hz) 0.4 0.5 RMS NOISE VOLTAGE vs COUT REG101-5.0 1 100 Noise Voltage (Vrms) Noise Voltage (Vrms) 0.9 REG101-5.0 40 REG101-3.3 30 20 REG101-2.5 10 CNR = 0.01F 10Hz < BW < 100kHz 0 90 REG101-3.3 80 REG101-2.5 70 60 50 40 CNR = 0F 10Hz < BW < 100kHz 30 20 1 0.1 10 1 10 COUT (F) COUT = 1F COUT = 0F eN (V/Hz) 1 IOUT = 100mA CNR = 0.01F 1 COUT = 1F 0.1 COUT = 0F COUT = 10F 0.01 COUT = 10F 0.01 10 100 1k Frequency (Hz) 10k 1k NOISE SPECTRAL DENSITY 10 IOUT = 100mA CNR = 0F 0.1 100 CNR (pF) NOISE SPECTRAL DENSITY eN (V/Hz) 0.8 110 50 6 0.7 RMS NOISE VOLTAGE vs CNR 60 10 0.6 VIN - VOUT (V) 10k 100k 10 100 1k 10k 100k Frequency (Hz) REG101 SBVS026D TYPICAL CHARACTERISTICS (Cont.) For all models, at TJ = +25C and VENABLE = 1.8V, unless otherwise noted. CURRENT LIMIT vs TEMPERATURE FOLDBACK CURRENT LIMIT 180 3.5 160 3.0 ICL 140 2.5 2.0 IOUT (mA) ICL 1.5 VIN = VOUT + 1V 120 100 80 1.0 ISC ISC 60 0.5 0 40 60 80 100 120 140 160 180 40 -50 -25 0 25 50 LOAD TRANSIENT RESPONSE LINE TRANSIENT RESPONSE COUT = 0F VOUT COUT = 10F VOUT IOUT 100mA 10mA COUT = 0 VOUT VOUT 5.3V VIN 10s/div 50s/div TURN-ON TURN-OFF 250s/div COUT = 1.0F RLOAD = 33 VOUT COUT = 0F RLOAD = 1600 VENABLE 1V/div REG101-3.3 VIN = VOUT + 1V CNR = 0.01F COUT = 10F RLOAD = 33 1V/div VOUT COUT = 10F RLOAD = 33 1V/div 1V/div REG101-3.3 IOUT = 100mA 4.3V COUT = 0F RLOAD = 33 125 COUT = 10F COUT = 0F RLOAD = 1600 SBVS026D 100 Output Current (mA) REG101-3.3 VIN = 4.3V REG101 75 Temperature (C) 50mV/div 20 200mV/div 200mV/div 0 50mV/div Output Voltage (V) REG101-3.3 VENABLE REG101-3.3 CNR = 0.01F 200s/div 7 TYPICAL CHARACTERISTICS (Cont.) For all models, at TJ = +25C and VENABLE = 1.8V, unless otherwise noted. IENABLE vs VENABLE POWER UP/POWER DOWN 10 VOUT = 3.0V RLOAD = 30 500mV/div IENABLE (A) 1 100n T = +25C T = +125C VIN 10n VOUT T = -55C 1n 6 7 8 9 10 1s/div VENABLE (V) RMS NOISE VOLTAGE vs CADJ ADJUST PIN CURRENT vs TEMPERATURE 0.350 80 REG101-A 0.300 VOUT = 3.3V 0.250 COUT = 0.1F 10Hz < frequency < 100kHz 60 IADJ (A) Vn (Vrms) 70 50 40 0.150 0.100 30 0.050 0.000 20 10 200mV/div 0.200 100 1k 10k -50 100k 10mA 8 25 50 75 100 LOAD TRANSIENT-ADJUSTABLE VERSION LINE TRANSIENT-ADJUSTABLE VERSION COUT = 0 VOUT 50mV/div COUT = 10F 125 COUT = 0 VOUT COUT = 10F VOUT VOUT REG101-A 100mA 0 Temperature (C) 50mV/div 200mV/div -25 CADJ (pF) VIN = 4.3V 5.3V VOUT = 3.3V IOUT REG101-A IOUT = 100mA CFB = 0.01F VOUT = 3.3V VIN 4.3V REG101 SBVS026D BASIC OPERATION the input supply voltage. This is recommended to improve ripple rejection by reducing input voltage ripple. The REG101 series of LDO (Low Drop-Out) linear regulators offers a wide selection of fixed output voltage versions and an adjustable output version. The REG101 belongs to a family of new generation LDO regulators that utilize a DMOS pass transistor to achieve ultra-low dropout performance and freedom from output capacitor constraints. Ground pin current remains under 650A over all line, load, and temperature conditions. All versions have thermal and overcurrent protection, including foldback current limit. The REG101 does not require an output capacitor for regulator stability and is stable over most output currents and with almost any value and type of output capacitor up to 10F or more. For applications where the regulator output current drops below several milliamps, stability can be enhanced by: adding a 1k to 2k load resistor; using capacitance values less than 10F; or keeping the effective series resistance greater than 0.05 including the capacitor's ESR and parasitic resistance in printed circuit board traces, solder joints, and sockets. Figure 1 shows the basic circuit connections for the fixed voltage models. Figure 2 gives the connections for the adjustable output version (REG101A) and example resistor values for some commonly used output voltages. Values for other voltages can be calculated from the equation shown in Figure 2. INTERNAL CURRENT LIMIT The REG101 internal current limit has a typical value of 170mA. A foldback feature limits the short-circuit current to a typical short-circuit value of 60mA. This helps to protect the regulator from damage under all load conditions. A characteristic of VOUT versus IOUT is given in Figure 3 and in the Typical Characteristics section. FOLDBACK CURRENT LIMIT 3.5 Although an input capacitor is not required, it is good analog design practice to connect a 0.1F low ESR capacitor across REG101 In 0.1F REG101-3.3 Output Voltage (V) Enable VIN 3.0 Gnd NR 2.0 ICL 1.5 1.0 ICL VOUT Out 2.5 0.5 COUT 0 CNR 0.01F 0 20 40 60 80 100 120 140 160 180 Output Current (mA) Optional FIGURE 1. Fixed Voltage Nominal Circuit for REG101. FIGURE 3. Foldback Current Limit of the REG101-3.3 at 25C. Enable 3 EXAMPLE RESISTOR VALUES 5 VOUT 1 VIN REG101 4 0.1F IADJ 2 Gnd R1 CFB 0.01F COUT VOUT (V) R1 (W)(1) R2 ()(1) 2.5 11.3k 1.13k 11.5k 1.15k 3.0 15.8k 1.58k 11.5k 1.15k 3.3 18.7k 1.87k 11.5k 1.15k 5.0 34.0k 3.40k 11.5k 1.15k Load Adj R2 Optional Pin numbers for SOT23 package. NOTE: (1) Resistors are standard 1% values. VOUT = (1 + R1/R2) * 1.267V To reduce current through divider, increase resistor values (see table at right). As the impedance of the resistor divider increases, IADJ (~200nA) may introduce an error. CFB improves noise and transient response. FIGURE 2. Adjustable Voltage Circuit for REG101A. REG101 SBVS026D 9 OUTPUT NOISE A precision band-gap reference is used for the internal reference voltage, VREF. This reference is the dominant noise source within the REG101 and it generates approximately 29Vrms in the 10Hz to 100kHz bandwidth at the reference output. The regulator control loop gains up the reference noise, so that the noise voltage of the regulator is approximately given by: RMS NOISE VOLTAGE vs CNR 110 100 REG101-5.0 Noise Voltage (Vrms) ENABLE The Enable pin is active HIGH and compatible with standard TTL-CMOS levels. Inputs below 0.5V (max) turn the regulator off and all circuitry is disabled. Under this condition, ground pin current drops to approximately 10nA. When a pull-up resistor is used, and operation down to VIN = 1.8V is required, use values < 50k. 90 REG101-3.3 80 REG101-2.5 70 60 50 40 CNR = 0F 10Hz < BW < 100kHz 30 20 1 100 10 10k 1k CNR (pF) FIGURE 5. Output Noise versus Noise Reduction Capacitor. R + R2 V VN = 29 Vrms 1 = 29 Vrms * OUT R2 VREF Since the value of VREF is 1.267V, this relationship reduces to: VN = 23 Vrms * VOUT V Connecting a capacitor, CNR, from the Noise Reduction (NR) pin to ground, as shown in Figure 4, forms a low-pass filter for the voltage reference. For CNR = 10nF, the total noise in the 10Hz to 100kHz bandwidth is reduced by approximately a factor of 2.8 for VO = 3.3V. This noise reduction effect is shown in Figure 5 and as "RMS Noise Voltage vs CNR" in the Typical Characteristics section. Noise can be further reduced by carefully choosing an output capacitor, COUT. Best overall noise performance is achieved with very low (< 0.22F) or very high (> 2.2F) values of COUT. See "RMS Noise Voltage vs COUT" in the Typical Characteristics section. The REG101 utilizes an internal charge pump to develop an internal supply voltage sufficient to drive the gate of the DMOS pass element above VIN. The charge-pump switching noise (nominal switching frequency = 2MHz) is not measurable at the output of the regulator over most values of COUT and IOUT. The REG101 adjustable version does not have the noisereduction pin available, however, the adjust pin is the summing junction of the error amplifier. A capacitor, CFB, connected from the output to the adjust pin will reduce both the output noise and the peak error from a load transient. See the typical characteristics for output noise performance. VIN NR (fixed output versions only) Low Noise Charge Pump CNR (optional) Enable VREF (1.26V) DMOS Pass Transistor VOUT Over Current Over Temp Protection R1 R2 Adj (Adjustable Versions) REG101 NOTE: R1 and R2 are internal on fixed output versions. FIGURE 4. Block Diagram. 10 REG101 SBVS026D DROP-OUT VOLTAGE The REG101 uses an N-channel DMOS as the "pass" element. When the input voltage is within a few tens of millivolts of the output voltage, the DMOS device behaves like a resistor. Therefore, for low values of VIN to VOUT, the regulator's input-to-output resistance is the RdsON of the DMOS pass element (typically 600m). For static (DC) loads, the REG101 will typically maintain regulation down to VIN to VOUT voltage drop of 60mV at full rated output current. In Figure 6, the bottom line (DC dropout) shows the minimum VIN to VOUT voltage drop required to prevent drop-out under DC load conditions. For large step changes in load current, the REG101 requires a larger voltage drop across it to avoid degraded transient response. The boundary of this "transient drop-out" region is shown as the top line in Figure 6. Values of VIN to VOUT voltage drop above this line insure normal transient response. In the transient dropout region between "DC" and "Transient", transient response recovery time increases. The time required to recover from a load transient is a function of both the magnitude and rate of the step change in load current and the available "headroom" VIN to VOUT voltage drop. Under worst-case conditions (full-scale load change with VIN to VOUT voltage drop close to DC dropout levels), the REG101 can take several hundred microseconds to re-enter the specified window of regulation. 140 Dropout Voltage (mV) 120 Full Scale IOUT Transient 100 80 60 TRANSIENT RESPONSE The REG101 response to transient line and load conditions improves at lower output voltages. The addition of a capacitor (nominal value 0.47F) from the output pin to ground may improve the transient response. In the adjustable version, the addition of a capacitor, CFB (nominal value 10nF), from the output to the adjust pin will also improve the transient response. THERMAL PROTECTION The REG101 has thermal shutdown circuitry that protects the regulator from damage. The thermal protection circuitry disables the output when the junction temperature reaches approximately 160C, allowing the device to cool. When the junction temperature cools to approximately 140C, the output circuitry is again enabled. Depending on various conditions, the thermal protection circuit may cycle on and off. This limits the dissipation of the regulator, but may have an undesirable effect on the load. Any tendency to activate the thermal protection circuit indicates excessive power dissipation or an inadequate heat sink. For reliable operation, junction temperature should be limited to 125C, maximum. To estimate the margin of safety in a complete design (including heat sink), increase the ambient temperature until the thermal protection is triggered. Use worst-case loads and signal conditions. For good reliability, thermal protection should trigger more than 35C above the maximum expected ambient condition of your application. This produces a worst-case junction temperature of 125C at the highest expected ambient temperature and worst-case load. The internal protection circuitry of the REG101 has been designed to protect against overload conditions. It was not intended to replace proper heat sinking. Continuously running the REG101 into thermal shutdown will degrade reliability. 40 DC 20 0 0 25 50 75 100 125 150 IOUT (mA) FIGURE 6. Transient and DC Dropout. REG101 SBVS026D 11 POWER DISSIPATION The REG101 is available in two different package configurations. The ability to remove heat from the die is different for each package type and, therefore, presents different considerations in the printed circuit board (PCB) layout. The PCB area around the device that is free of other components moves the heat from the device to the ambient air. While it is difficult to impossible to quantify all of the variables in a thermal design of this type, performance data for several configurations are shown in Figure 7. Power dissipation depends on input voltage, load condition, and duty cycle. Power dissipation is equal to the product of the average output current times the voltage across the output element, VIN to VOUT voltage drop. Power dissipation can be minimized by using the lowest possible input voltage necessary to assure the required output voltage. REGULATOR MOUNTING Solder pad footprint recommendations for the various REG101 devices are presented in the Application Bulletin AB-132, "Solder Pad Recommendations for Surface-Mount Devices" (SBFA015), available from the Texas Instruments web site (www.ti.com). PD = (VIN - VOUT ) * I OUT(AVG) 1.2 CONDITIONS SOT23-5 SO-8 Power Dissipation (W) 1.0 0.8 0.6 PACKAGE JA SOT23-5 SO-8 200C/W 150C/W 0.4 0.3 0 0 25 50 75 100 125 Ambient Temperature (C) FIGURE 7. Maximum Power Dissipation versus Ambient Temperature for the Various Packages. 12 REG101 SBVS026D PACKAGE OPTION ADDENDUM www.ti.com 17-Aug-2012 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/ Ball Finish MSL Peak Temp REG101NA-2.5/250 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-2.5/250G4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-2.5/3K ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-2.5/3KG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-2.8/250 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-2.8/250G4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-2.85/250 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-2.85/3K ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-2.85/3KG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-3.3/250 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-3.3/250G4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-3.3/3K ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-3.3/3KG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-3/250 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-3/250G4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-3/3K ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-3/3KG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Addendum-Page 1 (3) Samples (Requires Login) PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 17-Aug-2012 Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/ Ball Finish MSL Peak Temp (3) REG101NA-5/250 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-5/250G4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-5/3K ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-5/3KG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-A/250 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-A/250G4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-A/3K ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA-A/3KG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101NA2.85/250G4 ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM REG101UA-2.5 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR REG101UA-2.5G4 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR REG101UA-2.8 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR REG101UA-2.8/2K5 ACTIVE SOIC D 8 TBD Call TI Call TI REG101UA-2.8/2K5G4 ACTIVE SOIC D 8 TBD Call TI Call TI REG101UA-2.85 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR REG101UA-2.85G4 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR REG101UA-2.8G4 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR REG101UA-3 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR REG101UA-3.3 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Addendum-Page 2 Samples (Requires Login) PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 17-Aug-2012 Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/ Ball Finish MSL Peak Temp (3) REG101UA-3.3/2K5 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR REG101UA-3.3/2K5G4 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR REG101UA-3.3G4 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR REG101UA-3G4 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR REG101UA-5 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR REG101UA-5/2K5 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR REG101UA-5/2K5G4 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR REG101UA-5G4 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR REG101UA-A ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR REG101UA-AG4 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Samples (Requires Login) (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) Addendum-Page 3 PACKAGE OPTION ADDENDUM www.ti.com (3) 17-Aug-2012 MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. 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. 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 4 PACKAGE MATERIALS INFORMATION www.ti.com 17-Aug-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) REG101NA-2.5/250 SOT-23 DBV 5 250 179.0 8.4 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3.2 3.2 1.4 4.0 8.0 Q3 REG101NA-2.5/3K SOT-23 DBV 5 3000 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 REG101NA-2.8/250 SOT-23 DBV 5 250 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 REG101NA-2.85/250 SOT-23 DBV 5 250 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 REG101NA-2.85/3K SOT-23 DBV 5 3000 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 REG101NA-3.3/250 SOT-23 DBV 5 250 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 REG101NA-3.3/3K SOT-23 DBV 5 3000 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 REG101NA-3/250 SOT-23 DBV 5 250 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 REG101NA-3/3K SOT-23 DBV 5 3000 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 REG101NA-5/250 SOT-23 DBV 5 250 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 REG101NA-5/3K SOT-23 DBV 5 3000 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 REG101NA-A/250 SOT-23 DBV 5 250 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 REG101NA-A/3K SOT-23 DBV 5 3000 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 REG101UA-3.3/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 REG101UA-5/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 17-Aug-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) REG101NA-2.5/250 SOT-23 DBV REG101NA-2.5/3K SOT-23 DBV 5 250 203.0 203.0 35.0 5 3000 203.0 203.0 35.0 REG101NA-2.8/250 SOT-23 DBV 5 250 203.0 203.0 35.0 REG101NA-2.85/250 SOT-23 DBV 5 250 203.0 203.0 35.0 REG101NA-2.85/3K SOT-23 DBV 5 3000 203.0 203.0 35.0 REG101NA-3.3/250 SOT-23 DBV 5 250 203.0 203.0 35.0 REG101NA-3.3/3K SOT-23 DBV 5 3000 203.0 203.0 35.0 REG101NA-3/250 SOT-23 DBV 5 250 203.0 203.0 35.0 REG101NA-3/3K SOT-23 DBV 5 3000 203.0 203.0 35.0 REG101NA-5/250 SOT-23 DBV 5 250 203.0 203.0 35.0 REG101NA-5/3K SOT-23 DBV 5 3000 203.0 203.0 35.0 REG101NA-A/250 SOT-23 DBV 5 250 203.0 203.0 35.0 REG101NA-A/3K SOT-23 DBV 5 3000 203.0 203.0 35.0 REG101UA-3.3/2K5 SOIC D 8 2500 367.0 367.0 35.0 REG101UA-5/2K5 SOIC D 8 2500 367.0 367.0 35.0 Pack Materials-Page 2 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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