TS2951 Taiwan Semiconductor 150mA Ultra Low Dropout Voltage Regulator DESCRIPTION FEATURES The TS2951 are low power voltage regulators. These ● Output voltage available in 5V, 3V & 3.3V devices are excellent choice for use in battery-powered ● Extremely low quiescent current applications such as cordless telephone, radio control ● Low dropout voltage systems, and portable computers. ● Extremely tight load and line regulation The TS2951 is features very low quiescent current ● Very low temperature coefficient (75µA Typ.) and very low drop output voltage (Typ. ● Need only 1µF for stability 40µV at light load and 380mV at 100mA). This includes ● Use as Regulator or Reference a tight initial tolerance of 1% (A version), extremely ● Stable with low-ESR output capacitors good load and line regulation 0.05% typ. and very low ● Current and thermal limiting output temperature coefficient, making the TS2951 ● Error Flag warns of output dropout useful as a low-power voltage reference. ● Logic-Controlled electronic shutdown TS2951 have other key additional feature. The error flag ● Additional voltage tap output feature is used as power-on reset for warn of a ● Output voltage sense low output voltage, due to following batteries on input. ● Output programmable from 1.24 to 29V The logic-compatible shutdown input which enable the APPLICATION regulator to be switched on/off. The regulator output ● Battery powered systems voltage may be pin-strapped for a 5.0 & 3.3 & 3.0 of ● SMPS Post-Regulator and Voltage Reference programmed from 1.24V to 29V with external pair of ● Voltage Reference resistors. Using of as design, processing and testing ● Portable consumer equipment techniques make TS2951 superior over similar products. Pin Definition: 1. Output 2. Sense 3. Shutdown 4. Ground SOP-8 5. 6. 7. 8. Error flag Voltage tap FB Input Notes: Moisture sensitivity level: level 3. Per J-STD-020 TYPICAL APPLICATION CIRCUIT Adjustable Regulator Document Number: DS_P0000207 1 Version: G15 TS2951 Taiwan Semiconductor ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL LIMIT UNIT Input Supply Voltage VIN -0.3 ~ +30 V Feedback Input Voltage VFB -1.5 ~ +30 V Shutdown Input Voltage VSHUTDOWN -0.3 ~ +30 V VERROR -0.3 ~ +30 V PD Internally Limited Error Comparator Output Voltage Power Dissipation Operating Junction Temperature Range TJ TSTG Storage Temperature Range W -40 ~ +125 o -65 ~ +150 o C C THERMAL PERFORMANCE PARAMETER SYMBOL LIMIT UNIT Junction to Case Thermal Resistance RӨJC 45 °C/W Junction to Ambient Thermal Resistance RӨJA 180 °C/W Notes: RӨJA is the sum of the junction-to-case and case-to-ambient thermal resistances. The case thermal reference is defined at the solder mounting surface of the drain pins. RӨJA is guaranteed by design while RӨCA is determined by the user’s board design. RӨJA shown below for single device operation on FR-4 PCB in still air. ELECTRICAL SPECIFICATIONS (VIN=VOUT+1V, TA=25oC, unless otherwise specified.) CONDITIONS(Note 2) PARAMETER MIN TYP MAX TJ=25 C |0.985| 5.0 |1.015| Full Operating temp |0.980| 3.3 |1.020| 100uA≤ IL ≤100mA |0.975| 3.0 |1.025| -- 50 150 -- 20 100 -- 0.04 0.2 % -- 0.1 0.3 % 50 80 mV 380 450 mV 75 120 µA 8 12 mA o Output Voltage Output Voltage Temperature Coefficient (Note 1) (Note 3) Line Regulation (Note 3) Load Regulation (Note 5) Dropout Voltage 6V≤ VIN ≤30V (Note 4) 100µA≤ IL ≤100mA IL=100µA -- IL=100mA IL=100µA Ground Current -- IL=100mA UNIT V o ppm/ C Dropout Ground Current VIN= 4.5V, IL= 100uA -- 110 170 µA Current Limit VOUT= 0 -- 160 200 mA --- 0.05 0.2 %W 430 -- CL= 3.3µF -- 100 -- CL= 200µF -- 160 -- 1.21 1.235 1.27 V 1.185 1.235 1.285 V Thermal Regulation Output Noise, 10Hz to 100KHz Bypass=0.01uF CL= 1µF µV/ rms VREF ≤ VOUT ≤ (Vin-1V), (Note 6) Reference Voltage 2.3≤ Vin≤ 30V, 100uA≤ IL ≤ 100mA, TJ ≤ TJ (max) Document Number: DS_P0000207 2 Version: G15 TS2951 Taiwan Semiconductor ELECTRICAL SPECIFICATIONS (VIN=VOUT+1V, TA=25oC, unless otherwise specified.) CONDITIONS(Note 2) PARAMETER MIN TYP MAX UNIT -- 20 40 nA -- 20 -- ppm/ C -- 0.1 -- nA/ C VOH= 30V -- 0.01 1 µA VIN= 4.5V, IOL = 400µA Feedback Pin Bias Current Reference Voltage Temperature (Note 7) Coefficient Feedback Pin Bias Current Temperature Coefficient Output Leakage Current o -- 150 250 mV (Note 8) 40 60 -- mV (Note 8) -- 75 95 mV -- 15 -- mV -- 1.3 0.7 2.0 1.3 -- Vs = 2.4V -- 30 50 Vs = 30V -- 450 600 -- 3 10 Output Low Voltage Upper Threshold Voltage Power Threshold Voltage Hysteresis o (Note 8) Output Logic Voltage Shut down Pin Current Low (Regulator ON) High (Regulator OFF) Regulator Output Current shutdown V µA µA Note: 1. Output voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range. o 2. Unless otherwise specified all limits guaranteed for TJ= 25 C, VIN= 6V, IL= 100µA and CL= 100µF. Additional conditions for the 8-pin versions are feedback tied to 5V, 3.3V & 3V tap output Sense (VOUT = 5V, 3.3V & 3V) and shutdown ≤ 0.8V. 3. Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specification for thermal regulation. o o 4. Line regulation for the TS2951 is tested at 85 C for IL= 1mA. For IL= 100µA and TJ= 125 C, line regulation is guaranteed by design to 0.2%. 5. Dropout Voltage is defined as the input to output differential at which the output voltage drops 100mV below its nominal value measured at 1V differential at very low value of programmed output voltage, the minimum input supply voltage of 2V (2.3V over temperature) must be taken in to account. 6. VREF ≤ VOUT ≤ (Vin-1V), 2.3≤ Vin≤ 30V, 100µA≤ IL ≤ 100mA, TJ ≤ TJ (max). 7. Reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. 8. Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at 6V input. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain= VOUT / VREF = (R1+R2) / R2. For example, at a programmed output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95 mV X 5V / 1.250 = 384mV. Thresholds remain constant as a percent of VOUT as VOUT is varied with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed. Document Number: DS_P0000207 3 Version: G15 TS2951 Taiwan Semiconductor ORDERING INFORMATION OUTPUT VOLTAGE PACKAGE PACKING 5.0V TS2951CS50 RLG PART NO. SOP-8 2,500pcs / 13” Reel 3.3V TS2951CS33 RLG SOP-8 2,500pcs / 13” Reel 3.0V TS2951CS30 RLG SOP-8 2,500pcs / 13” Reel Note: 1. Compliant to RoHS Directive 2011/65/EU and in accordance to WEEE 2002/96/EC. 2. Halogen-free according to IEC 61249-2-21 definition. Document Number: DS_P0000207 4 Version: G15 TS2951 Taiwan Semiconductor BLOCK DIAGRAM APPLICATION INFORMATION External Capacitors For the stability of the TS2951 is requires a 1.0µF (0.22µF is recommended for 3.0V & 3.3V) or greater capacitor between output and ground. Oscillation could occur without this capacitor. The tantalum or aluminum electrolytic o works fine; could use the film type work but are not cost efficient. For the operation of below -25 C solid tantalum is o recommended since the many aluminum type have electrolytes the freeze at about -30 C. The ESR of about 5Ω or less and resonant frequency above 500KHz are most important parameter in the value of Capacitor. The Capacitors value can be increased without any limit. At lower values of output current, less output capacitance is required for stability. For the currents below 10mA the value of capacitor can be reduce to 0.33µF and 0.1µF for 1mA. More output capacitance needed for the 8-pin version at voltage below 5V since it runs the error amplifier at lower gain. At worst case 3.3≈F or greater must be used for condition of 100mA load at 1.250V output. The TS2951 is not like other low dropout regulators will remain stable and regulation with no load in addition to the internal voltage divider. This feature very important in application, it is like CMOS RAM keep-alive. The TS2951 output voltage is set with minimum load of 1µA and external resistors. If at the input ofTS2951 connected to battery or between AC filter capacitor and input is 10 inches wire then 1uF tantalum or aluminum electrolytic capacitor should be connected between input and ground. Instability can occur if stray capacitor to feedback terminal pin 7 of the TS2951. This could cause more problems when using higher value of external to set the output voltage. To fix this problem the 100pF capacitor between output and feedback and increasing output capacitance to 3.3µF. Document Number: DS_P0000207 5 Version: G15 TS2951 Taiwan Semiconductor APPLICATION INFORMATION (CONTINUE) Reducing Output Noise It could be an advantage to reduce the AC noise present at the output. One method is to reduce the regulator bandwidth by increasing the value of the output capacitor. This is the only method that noise could reduce on the TS2951, but is relatively inefficient, as increasing capacitor from 1µF to 220µF only decreases the noise from 430µV to 160µVrms for a 100KHz bandwidth at 5V output. Noise could be also reduced by fourfold by a bypass capacitor across R1 since it reduces the high frequency gain from 4 to unity. Pick Cbypass= 1 / 2πR1 * 200Hz or choose 0.01µF when doing this, the output capacitor must be increased to 3.3uF to maintain stability. These change the output noise from 430µV/rms for a 100 kHz bandwidth 5V, 3.3V & 3V output. With the bypass capacitor added, noise no longer scales with output voltage so that improvements are more dramatic higher output voltage. Error Detection Comparator Output The Compactor produces a logic low output whenever the TS2951 output falls of regulation by more than around 5%. This is around 60 mV offset divided by the 1.235 reference voltage. Thus trip remains 5% below nominal regardless of the programmed output voltage of the regulator. The Figure 1 shows the timing diagram depicting the ERROR signal and the regulator output voltage as the TS2951 input is ramped up and down. The ERROR signal becomes low at around 1.3V input, it goes high around 5V input (input voltage at which VOUT=4.75V). The TS2951 dropout voltage depending on the load, the input voltage trip point around 5V will vary with load current. The output voltage trip point is around 4.75V, it does not change with load. The error comparator has an open-collector output which requires an external pull-up resistor. Depending on the system requirement, the resistor maybe returned to 5 or 3.3V output or other supply voltage depending to the system requirements. For determining the size of the resistor, note that the output is sinking 400uA, this value adds to battery drain in a low better condition, recommended values 100K to 1MΩ. If the output is unused this resistor is not required. Programming The output Voltage The TS2951 output voltage is programmable for any value from it reference voltage of 1.235V and it maximum rating of 30V. For example for 5 volt needs to pin-strapped and using the internal voltage divider by tying pin 1 to 2 and pin 7 to pin 6. There are two external resistor required for this programming. Refer to the below equation for the programming the output voltage: Volt=VREF x (1+R1\R2)+IFB * R1 The VREF is 1.235V and IFB is the feedback bias current, nominally -20nA. The minimum recommended load current of 1µA forces an upper limit of 1.2MΩon value of R2, If no load presented the IFB produces error of typically 2% in VOUT which maybe eliminated at room temperature by trimming R1. To improve the accuracy chooses the value of R2=100K and this reduces the error by 0.17% and increases the resistor program current by 12µA. The TS2951 typically draw 60µA at no load with pin 2 open-circuit, and this value does not look much. Error Output Timing Document Number: DS_P0000207 6 Version: G15 TS2951 Taiwan Semiconductor CHARACTERISTICS CURVES (TA = 25°C unless otherwise noted) Figure 1. Line Regulation vs. Input Voltage Figure 2. Load Regulation vs. Output Current Figure 3. Ground Pin Current vs. Output Current Figure 4. Ground Pin Current vs. Input Voltage Figure 5. Dropout Voltage vs. Output Current Document Number: DS_P0000207 Figure 6. Load Transient Response 7 Version: G15 TS2951 Taiwan Semiconductor PACKAGE OUTLINE DIMENSIONS (Unit: Millimeters) SOP-8 SUGGESTED PAD LAYOUT (Unit: Millimeters) MARKING DIAGRAM XX = Voltage Code (50=5.0V, 33=3.3V, 30=3.0V ) Y M = Year Code = Month Code for Halogen Free Product O =Jan P =Feb Q =Mar R =Apr S =May T =Jun U =Jul V =Aug W =Sep X =Oct Y =Nov Z =Dec = Lot Code L Document Number: DS_P0000207 8 Version: G15 TS2951 Taiwan Semiconductor Notice Specifications of the products displayed herein are subject to change without notice. TSC or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description only. No license, express or implied, to any intellectual property rights is granted by this document. Except as provided in TSC’s terms and conditions of sale for such products, TSC assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of TSC products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify TSC for any damages resulting from such improper use or sale. Document Number: DS_P0000207 9 Version: G15