TS1581CM5RN

T S1 5 8 1 5A Dual Input LDO T O- 2 2 0 - 5 L TO-263-5L 2 (D PAK) Pin Definition: 1 . Se n s e 2 . A d j / Gn d 3. Output 4. V Control 5 . V Po we r General Description The TS1581 family is a positive adjustable and fixed v oltage r egulator developed to provide 5A w ith H igher efficiency than currently available dev ices. All internal circuit is designed to operate down to 700mV input to output differential and the dropout voltage is fully specified as a function of load current. Dropout voltage of the device is 100mV at light loads and rising to 700mV at maximum output current. A Second low current input is required to achieve this dropout. The TS1581 ser ies are designed to prevent device failure under the worst operation condition with both Thermal Shutdown and Current Fold- back. Features ● ● ● ● ● ● ● ● Very low dropout voltage: 700mV @5A Output current up to 5A Low current Consumption High Accuracy Output Voltage: ±1% Fast transient response Remote sense Inter nal current limit Thermal shutdown pr otec tion Ordering Information Part No. Package Packi ng TS1581CZ5 C0 TO-220-5L 50pc s / T ube TS1581CZ5xx C0 TO-220-5L 50pc s / T ube TS1581C M5 RN TO-263-5L 800pc s / 13” R ee l TS1581C M5xx RN TO-263-5L 800pc s / 13” R ee l Note: W here xx denotes voltage option, available are 3.3V, 2.5V & 1.8V. Leave blank for adjus table version. Contact factory for additional voltage options. Applications ● ● ● ● High efficiency linear regulator Post regulators for switching supplies Advance graphic card Adjus table power supply Typical Application Circuit Block Diagram 1/9 Version: A07 T S1 5 8 1 5A Dual Input LDO Absolute Maximum Rating Parameter Input Supply Voltage V Pow er V C ontrol Power Dissipation Operating Junction Temperature R ange Storage Temperature Range Lead Soldering Temperature (260 C) o Symbol Vpower Vcontrol PD TJ TSTG Val ue 7 13 Inter nally Limited 0 ~ +1 2 5 - 6 5 ~ +1 5 0 10 Units V W o o C C S Electrical Characteristics Ta=+25°C, Ccontrol=Cpower=Cout=10uF unless Specified Parameter Reference Voltage (Adj. Voltage Versions) Output Voltage (Fixed Voltage Versions) Line R egulation Load R egulation Mini. Load Current (Note 2) Control Pin Current (Note 3) Adjus t Pin Current Current Limit Ripple Rejec tion Thermal R egulation Conditi ons VCONTROL = 4.5V, VPOWER = 2.05V, IO = 10mA VCONTROL = 4.5V, VPOWER = 2.05V, IO = 10mA to 5A VCONTROL = 5V, VPOWER =VOUT+0.8V, IO = 10mA VCONTROL = 5V, VPOWER = VOUT +0.8V, IO = 10mA to 5A VCONTROL = (VOUT +1.5V) to 12V, VPOWER = (VOUT +0.8V) to 5.5V, IO = 10mA VCONTROL = (VOUT +2.5V) , VPOWER = (VOUT +0.8V), IO = 10mA to 5A VCONTROL =5V, VPOWER= 3.3V, VADJ=0V VCONTROL = (VOUT +2.5V) , VPOWER = (VOUT +0.8V), IO = 10mA to 5A VCONTROL = 2.75V, VPOWER = 2.05, VADJ = 0V, IO = 10mA VPOWER - VOUT = 3V VCONTROL = VPOWER = 5V, VRIPPLE = 1V, IO = 2.5A, f = 120kHz 30mS pulse Mi n 1.238 1.230 -1.0 -1.6 -----5.5 60 -- Ty p 1.250 Max 1.262 1.270 +1.0 Unit V VOU T +1.6 0.2 0.4 10 135 120 ---- % 0.04 0.08 5 80 50 6.8 80 0.003 % % mA mA uA A dB %/W Dropout Voltage (Note 4) VCONTROL = (VOUT +2.5V) , IO = 5A -0.55 0.70 V Note1: VOU T = VSENSE, VADJ = 0V unless otherwis e specified. Note2: For the adjus table device the minimum load cur rent is the minimum current required to maintain regulation, normally the current in the resis tor divider used to set the output voltage is selec ted to meet the minimum load current requirement. Note3: The contr ol pin current is the drive current required for the output transistor , this current will track output current with a ratio of about 1:100 Note4: If the same voltage is input to both VPOWER and VCONTROL, then the dropout voltage w ill become 1.3V maximum, and minimum input/output voltage required to maintain 1% regulation. 2/9 Version: A07 T S1 5 8 1 5A Dual Input LDO Thermal Performance Conditi on Thermal R esistance Junction to Ambient Package type TO-220-5L TO-263-5L Ty p 50 60 Unit o C/W Pin Description Pin No. 1 2 3 4 Pin Name Sense Adjust / Ground Output Control Pin Descripti on This pin is the positive s ide of the reference voltage for this device. W ith this pin it is possible to Kelvin Sense the output voltage at the load. This pin is the negative side of the reference voltage for this device. Transient response can be improved by adding a small bypass capacitor fr om the adjust pin to ground. This pin is power output of the device. This pin is the supply pin for the control circuitry for the device. The current flow into this pin w ill be about 1% of the output current. For the devic e to regulate, the voltage at this pin must be 1.3V greater than the output voltage. This pin is the collec tor of the power transistor. The output load current is supplied 5 Power through this pin. The voltage at this pin must be 0.7V gr eater than the output voltage for the device to regulate. Application Information Applicati on The TS1581 is a low dropout regulator designed to make used of multiple power supplies, present in most sy stems , to reduce the dropout voltage. One of the advantages of the two supply approach is maximizing the efficiency. The second supply is at leas t 1V gr eater than output voltage and is providing the power for the control circuitry and supplies the drive current to the N PN output transistor. This allows the N PN output transis tor to be driven into saturation. For the control voltage the current requirement is s mall equal to about 1% of the output current or approximately 50mA for a 5A load. This drive current becomes part of the output current. The maximum voltage on the C ontrol Pin is 15V. The maximum voltage at the Pow er in is 7V.By tying the control and power inputs together the TS1581 can also be operated as a single supply device. In s ingle supply operation the dropout will be deter mined by the minimum control voltage. Both the fixed and adjus table versions have r emote sense pins , per mitting very accurate regulation of output voltage. As a result, over and output current range of 100mA to 5A, the typical load regulation is less than 1mV. For the fixed voltages the adjust pin is br ought out allow ing the user to improve transient response by bypassing the internal resistor divider. Optimum transient response is prov ided using a capacitor in the range of 0.1uF to 1uF for bypassing the adjus t pin. The new generation of microprocessors cycle load curr ent fr om several hundred million amperes to several amperes in tens of nanoseconds. Output voltage tolerances are tighter and include transient response as part of the specification. Designed to meet the fas t current load step requirements of these microprocessors, the TS1581 also saves total cos t by needing less output capacitance to maintain regulation. Typical applications for the TS1581 include 3.3V to 2.5V conversion with a 5V control supply, 5V to 4.2V conv ersion with a 12V control supply or 5V to 3.6V conversion with a 12V control supply . It is easy to obtain dropout voltages less than 0.5V at 1.5A along with excellent static and dynamic specifications. It is fully protected against over current and over temperature conditions. 3/9 Version: A07 T S1 5 8 1 5A Dual Input LDO Application Information (Continue) Groundi ng and Output Sensing The TS1581 allows true Kelv in sens ing for both the high & low side of the load. A result the voltage regulation at the load can be easily optimized. Voltage drops due to parasitic resis tances between the regulator and the load can be placed inside the regulation loop. The advantages of remote sensing are illus trated in Figure 1 through 3. Figure 1 show the device connected as a conventional 3 ter minal regulator with the Sense lead connected directly to the output of the device. R p is the parasitic resistance of the connec tions between the device and the load. Trace A of Figure 3 illus trates the effect of Rp. Figure 2 show the device connected to take advantage of the remote sense feature. The Sense Pin and the top of the resistor divider are connected to the top of the load; the bottom of the resistor divider is connec ted to the bottom of the load. Fi gure 1. Conventi onal Load Sensi ng Fi gure 2. Remote Load Sensi ng The effect on output regulation can be seen in trace B of Figure 3. It is important to note that the voltage dr ops due to Rp are not eliminated; they will add to the dropout v oltage of the regulator regardless. The TS1581 can c ontrol the voltage at the load as long as the input-output voltage is greater than the total of the dropout voltage of the device plus the v oltage drop across Rp Fi gure 3. Remote Sensi ng Impr oves Load Regulati on Fi gure 4. Illustrates there transient effects 4/9 Version: A07 T S1 5 8 1 5A Dual Input LDO Application Information (Continue) Stability The c ircuit design used in the TS1581 Series r equires the use of an output capac itor as part of the device fr equency compensation. The addition of 150uF aluminum elec tr olytic or a 22uF solid tantalum on the output will ensur e stability for all operating conditions. In order to meet the transient per for mance of the processor larger value capacitors are needed. To limit the high frequency noise generated by the processor high quality bypass capacitors mus t be used. In order to limit parasitic induc tance (ESL) and resistance (ESR) in capacitors to acceptable limits, multiple small ceramic capacitors in addition to high quality solid tantalum capacitors are required. When the adjus tment ter minal is bypass to improve the ripple rejec tion, the requirement for an output capacitor increases. The Adjus t pin is brought out on the fixed voltage device specifically to allow this capability. To further improve s tability and transient response of these devices larger values of output capac itor can be used. The modern processors generate large high frequency current transients . The load current s tep contains higher order frequency components than the output coupling network mus t handle until the regulator throttles to the load current level. Because they contain parasitic resistance and inductance, capac itors are not ideal elements. These parasitic elements dominate the change in output voltage as the beginning of a transient load step change. The ESR of the output capacitors produces and instantaneous s tep in output v oltage ΔV = ΔI (ESR) . The ESL of the output capacitors produces a drop proportional to the rate of change of the output current V = L ( ΔI / Δt). the output capacitance produc es a change in output voltage proportional to the time until the regulator can respond ΔV = Δt ( ΔI / C). Output Voltage The TS1581 (adjus table version) develops a 1.25V r eference voltage betw een the Sense Pin and the Adjust Pin (Figure 5) . Placing a resis tor between these two ter minals causes a constant current to flow though R1 and down though R2 to set the output voltage. In general R 1 is c hosen so that this current is the specified minimum load current of 10mA. The current out of the Adjus t pin is s mall, typically 50uA and it adds to the current from R1.For bes t r egulation the top of the resistor divider should be connected directly to the Sense pin. Fi gure 5. Setti ng Output Voltage Fi gure 6. Optional Cl amp Di odes Pr otect Against I nput Crowbar Circuits 5/9 Version: A07 T S1 5 8 1 5A Dual Input LDO Application Information (Continue) Protecti on Di ode In nor mal operation TS1581 family does not need any protection diodes between the Adjus t pin and the output and from the output to the input to pr event die overstr ess. Internal resis tors are limiting the internal current paths on the Adjus t pin. Therefore ev en with bypass capacitors on the Adjus t pin no protec tion diode is needed to ensure device safety under short-circuit conditions . The Adjust pin can be driver on a transient basis +/-7V with respec t to the output without any device degradation. A protection diode between the Output pin and Vpow er pin is not usually needed. Microsecond surge currents of 50A to 100A can be handled by the internal diode betw een the Output pin and Vpower pin of the device. In nor mal operations it is difficult to get those values of surge cur rents even with the use of large output capacitances. Only with high value output capacitors, such as 1000uF to 5000uF and the Vpower pin is ins tantaneously shorted to ground, damage can occur. A diode from output to input is recommended. If TS1581 is connected as a single supply device w ith the control and power input ins shorted together the internal diode between the output and the pow er input pin w ill protect the control input pin. Ther mal Considerati ons The TS1581 family have internal pow er and ther mal limiting circuit designed to protect the dev ice under overload conditions. H owever maximum junc tion temperature r atings should not be exceeded under continuous nor mal load conditions. Careful consideration must be given to all s ources of ther mal resis tance from junction to ambient, including junction-to-case, case-to-heat sink interface and heat s ink resistance itself. Junction temperature of the Control section can urn up to125ºC . Junc tion temperature of the Power section can run up to 150ºC. Due to the ther mal gradients between the power transistor and the control c ircuitry there is a significant difference in thermal resistance between the Control and Power sections. Virtually all the power dissipated by the device is dissipated in the power transistor. The temperature rise in the power transistor w ill be greater than the temperature rise in the Control sec tion making the thermal resistance low er in the Control sec tion. At power levels below 12W the temper ature gradient will be less than 25ºC and the maximum ambient temperature w ill be deter mined by the junc tion temper ature of the Control section. This is due to the lower maximum junction temperature in the C ontrol sec tion. At power levels above 12W the temperature gradient will be gr eater than 25ºC and the maximum ambient temperature w ill be determined by the Pow er section. In both cases the junction temperature is determined by the total power dissipated in the dev ice. For mos t low dropout applications the power dissipation will be less than 12W. The power in the device is made up of two components: the power in the output transistor and the power in the control circuit. The power in the control circuit is negligible. The power in the control circuit is equal to: Pcontrol = ( Vcontrol – Vout ) ( Icontrol ) Where Icontrol is equal Iout / 100 (typ) The power in the out transis tor is equal to: Poutput = ( Vpower – Vout ) ( Iout ) The total power is equal to: Ptotal = Pcontrol + Poutput Junction- to-case thermal resistances is specified from the IC junc tion to the bottom of the case direc tly below the die. This is the lowes t resistance path for the heat flow. In order to ensure the bes t possible ther mal flow this ar ea of the package to the heat sink proper mounting is requir ed. Thermal compound at the case-to-heat s ink interface is recommended. A ther mally conductive spacer can be used, if the case of the device mus t be elec trically isolated, but its added contr ibution to thermal res istance has to be c onsidered. 6/9 Version: A07 T S1 5 8 1 5A Dual Input LDO TO-220-5L Mechanical Drawing DIM A B C D E F G H I J K L M N TO-220-5L D IMEN SION MILLIMETER S INCH ES MIN MAX MIN MAX 10.00 10.50 0.394 0.413 3.240 4.440 0.128 0.175 2.440 2.940 0.096 0.116 0.260 1.020 0.010 0.040 1.570 1.830 0.062 0.072 13.31 14.13 0.524 0.556 4.475 5.225 0.176 0.206 1.170 1.370 0.046 0.054 27.60 29.44 1.087 1.159 2.175 2.925 0.086 0.115 0.297 0.477 0.012 0.019 8.280 8.800 0.326 0.346 6.010 6.510 0.237 0.256 14.29 15.31 0.563 0.603 Marking Diagram Y M = Year Code = Month C ode (A=Jan, B =Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep, J=Oc t, K=Nov , L=Dec) L = Lo t C ode XXX = Voltage Code (1.8=1.8V, 2.5=2.5V, 3.3=3.3V, 5.0=5V) = Package Code for Adjustable type (CZ5 = TO-220-5L) 7/9 Version: A07 T S1 5 8 1 5A Dual Input LDO TO-263-5L Mechanical Drawing DIM A B C D E F G H I J TO-263-5L D IMEN SION MILLIMETER S INCH ES MIN MAX MIN MAX 10.220 10.260 0.402 0.404 14.600 15.870 0.575 0.625 0.750 0.770 0.030 0.030 1.573 1.827 0.062 0.072 4.560 4.570 0.179 0.180 1.240 1.270 0.049 0.050 2.280 2.790 0.090 0.110 0.280 0.320 0.011 0.013 8.240 8.280 0.324 0.326 1.540 1.800 0.060 0.071 Marking Diagram Y M = Year Code = Month C ode (A=Jan, B =Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep, J=Oc t, K=Nov , L=Dec) L = Lo t C ode XXX = Voltage Code (1.8=1.8V, 2.5=2.5V, 3.3=3.3V, 5.0=5V) = Package Code for Adjustable type (CM5 = TO-263-5L) 8/9 Version: A07 T S1 5 8 1 5A Dual Input LDO Notice Specifications of the produc ts displayed herein are s ubject to change without notice. TSC or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Infor mation contained herein is intended to pr ovide a product description only. N o license, express or implied, to any intellectual proper ty 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 par ticular purpose, merchantability, or infringement of any patent, copyright, or other intellectual proper ty right. The products shown herein are not designed for use in medical, life-saving, or life-sus taining applications . C ustomers 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. 9/9 Version: A07