CS-5203 3 Amp Low Dropout Postitive Voltage Regulator DESCRIPTION FRONT VIEW 00000The CS5203 series of positive adjustable and fixed regulators are designed to provide 3A with higher efficiency than in devices currently available. All internal circuitry is designed to operate down to 700 mV input to output differential and the dropout voltage is fully specified as a function of load current. Dropout voltage of the device is 100 mV at light loads and rising to 700 mv at maximum output current. A second low current input is required to achieve this dropout. The CS5203 can also be used as a single supply device (3 pin version). TAB IS V OUT 3 IN 2 OUT 1 ADJ/GND T0-263 3 L E A D T O -220 V IN 3 2 1 V OUT A D J /G N D F R O N T V IE W 5 L E A D T O -220 FEATURES Adjustable or Fixed Output. Output Current of 3A. Low Dropout, 700 mV at 3A Ouput Current. 0.04% Line Regulation. 0.1% Load Regulation. 100% Thermal Limit Burn-ln. Fast Transient Response. Remote Sensing. V P OWE R V C ONT R OL 5 4 3 2 1 OUTP UT A D J U S T /G N D S E NS E F R O N T V IE W Typical application data 2.5V ,3A regulator 5V V CONTROL V OUT Cs5203 3.3V 1 F 10V V POWER 10 5V F V SENSE Adjust 0.1 5V F 2.5V,3A R 1 124 1% R 2 124 1% Load 150 5V F V OUT =V REF (1+R2/R1)+I ADJ R2 Absolute Maximum Ratings Symbol PD V IN TJ Parameter Power Dissipation Input Voltage Vpo wer Vcontrol Operating Junction Temperature Range Control Section PowerTransistor T STG T LEAD Storage Temperature Lead Temperature (Soldering, 10sec) 1 Maximum Internally Limited Units W V 7 13 0 to 125 0 to 150 -65 to 15 0 300 CS-5203 3 Amp Low Dropout Positive Voltage Regulator Electrical Characteristics(Note 1) Electrical Characteristics at I LOAD =0 mA and T J =+25 unless otherwise specified Min Parameter Device Test Conditions Typ Reference Voltage Output Voltage Line Regulation CS5203 CS5203 -1.5 CS5203 -2.5 CS5203 -2.85 CS5203 -3.0 CS5203 -3.3 CS5203 -3.5 CS5203 -5.0 All Load Regulation All Minimum Load Current (Note 2) CS5203 V CONTROL = 2.75V,V POWER = 2V, I LOAD =10mA V CONTROL = 2.7V to 12V, V POWER = 3.3V to 5.5V, I LOAD =10mA to3 A V CONTR V CONTR OL =3V, V POWER V CONTR V CONTR OL =4V, V POWER Max Units V 1.238 1.250 1.262 * 1.230 1.250 1.270 =2V =2.3V , I LOAD =0mA to3 A 1.485 1.475 1.500 1.500 1.515 1.525 V * =3.3V =3.3V , I LOAD =0mA to3A 2.475 2.460 2.500 2.500 2.525 2.540 V * V CONTR V CONTR , V POWER = 3.35V =4.4V , V OL POWER = 3.7V , I LOAD =0mAto3 A 2.821 2.805 2.850 2.850 2.879 2.895 V * V CONTR V CONTR OL =5.5V , V POWER * 2.970 2.950 3.000 3.000 3.030 3.050 V OL =4.5V , V POWER =3.5V =3.8V , I LOAD =0mA to3 A V CONTR V CONTR =3.8V =4.1V , I LOAD =0mA to3 A * 3.267 3.247 3.300 3.300 3.333 3.353 V OL =4.8V , V POWER V CONTR V CONTR =4V =4.3V , I LOAD =0mA to3 A * 3.465 3.445 3.500 3.500 3.535 3.555 V OL =5V, V POWER V CONTR V CONTR * 4.950 4.920 5.000 5.000 5.050 5.080 V OL =6.5V , V POWER 0.04 0.20 % 0.08 0.40 % 1.7 5 mA 60 mA OL =4V, V POWER OL =5V, V POWER OL = 5.35V OL =5.8V , V POWER OL =6V, V POWER OL =7.5V , V POWER =5.5V =5.8V , I LOAD =0mA to3 A I LOAD =10mA,(1.5V+ V OUT ) V CONTROL ( V POWER - V OUT ) 5.5V 12V, 0.8V * V CONTROL = V OUT +2.5V, V POWER = V OUT +0.8V, I LOAD =10mA to 1A V CONTROL =5V, V POWER =3.3V, V ADJ =0V * * V CONTROL = V OUT +2.5V, V POWER = V OUT +0.8V, I L OAD =10mA to 3 A * Ground Pin Current C S 5203-1.5/ V CONTROL = V OUT +2.5V, V POWER = V OUT +0.8V, * 5 10 mA * 50 120 A Control Pin Current All (Note 3) -2.5/-2.85 -3.0/-3.3/-3.5 -5.0 I LOAD =10mA to 3A Adjust Pin Current CS5203 Current Limit Ripple Rejection All All V CONTROL =2.75V, V POWER =2.05 V, I LOAD =10mA ( V IN - V OUT )=3V Thermal Regulation CS5203 Dropout V oltage All Control lnput (V CONTROL - V OUT ) Power lnput All (V POWER - V OUT ) * V CONTR OL = V POWER = V OUT +2.5V , V RIPPLE =1 V P-P , I LOAD =1.5A T A =25 ,30ms pulse 3 4 A 60 75 dB 0.003 %/W Note 4 V POWER = V OUT +0.8V, I LOAD =10mA V POWER = V OUT +0.8V, I LOAD =3A * * 1.00 1.15 1.15 1.30 V V CONTROL = V OUT +2.5 V , I LOAD =3A * 0.55 0.70 V The * denotes the specifications which apply over the full temperature range. Note 1:Unless otherwise specified V out = V sense . For CS5203(adj) V adj = 0V Note 2:For the adjustable device the minimum load current is the minimum c urrent required to maintain in requlation.Normally OOOO the current in the resistor divider used to set the output voltage is selected to meet the minimum load current requirement. Note 3:The control pin current is the drive current required for the output transistor. This current will track output current OOOO with a ratio of about 1:100. Note 4:The dropout voltage for the CS5203 is caused by eithe r minimum contro l voltag e or minimum powe r voltage. OOOO The specifications represent the minimum input/output voltage required to maintain 1% regulation. 2 CS-5203 3 Amp Low Dropout Positive Voltage Regulator PIN FUNCTION ( 5-L e a d ) Sense (Pin 1) : T his pin is the positive side of the Ad jus t (Pin 2) : This pin is the negative side of the V PO WER (Pin 5): This pin is the collector of the power transistor . The output load current is supplied through this pin. The voltage at this pin must be 0.7V greater than the output voltage for the device to regulate.0000000000000000 reference voltage. Adding a small bypass capacitor from the Adjust pin to ground improves the transient response. For fixed voltage devices the Adj ust pin is also brought out to allow the user to add a bypass capacitor. 00000000 V CO NTROL (Pin 4): This pin is t he supply pin for the control circuitry. The current flow into this pin will be about 1% of the output current. The voltage at this pin must be 1. 3V greater than the output volta ge for the device to regulate. GND (Pin 2 ): For fixed voltage device this is the bottom Ou tput (Pin 3): This is the power output of the device. 000 reference voltage. W ith this pin it is possible to Kelvin Sense the output voltage at the load.0000000000000000 of the resistor divider that sets the output voltage. 000000 B lo c k D ia g r a m V CONTROL V POWER + - SENSE V OUT FOR FIXED VOLTAGE DEVICE ADJ 1 For adjustable voltage device GND 3 CS-5203 3 Amp Low Dropout Positive Voltage Regulator A pplic a tio n I n fo r m a tio n 5. 0V The CS 5203 is designed to make use of multiple power supplies, to reduce the dropout volta ge. One of the advantages of the two supply approach is maximizing the 000000 0000000000000000000000000 efficiency. The second supply is at least 1V greater than output voltage and is providing the power for the control circuitry and supplies the drive current to the N PN output transistor. Thi s allows the NPN output transistor to be driven into saturation. For the control voltage the current requirement is small equal to about 1% of the output current. Thi s drive current becomes part of the output current. The maximum voltage on the Control pin is 12V. The maximum voltage at the Power pin is 7V. By typing the control and power inputs together the CS5203 can also be operated as a single supply device. In single supply operation the dropout will be determined by the minimum control voltage.0000000000000000000000000000000000 Both the fixed and adjustable versions have remote sense pins, per mitting very accurate regulation of output voltage. As a result, over an output current range of 100mA to 3A , the typical load regulation is less than 1mV. For the fixed voltages the adjust pin is brought out allowing the user to improve transient response by bypassing the internal resistor divider. Optimum transient response is provided using a capacitor in the range of 0.1 F to 1 F f or bypassing the A djust pin.000000000000 In add ition to the enhancements mentioned, the reference accuracy has been improved a factor of two with a guaranteed ini tial tolerance of 1% at 25 and 1.6% accuracy over the ful l temperature and load current range.00000000000000000000000000000000000000000 Typical applications for the CS 5203 include 3.3V to 2.5V conversion w ith a 5V control supply, 5V to 4. 2V conversion with a 12V control supply or 5V to 3. 6V conversion with a 12V control supply. The dev ice is fully protected against overcurrent and ov ertemperature conditions. 0000000000000000000000000000000000000 C O N TRO L 3. 3V P OWE R R p. OUTP UT AD J . R1 R2 LOAD R F igure 1 . C onve nt ional Load Sen si ng 5. 0V 3. 3V C O N TR O L P OWE R S E NS E C S 5203 OUTP UT AD J . R R1 LOAD R2 R p. F igure 2 . Remote Load Sensing Grounding and Output Sencing ( 0 I O U T )( R P ) The CS 5203 allows true Kelvin sensing for both the high and low side of the load. A s a result the voltage regulation at the load can be easily optimized. V oltage drops due to parasitic resistances between the regulator and the load can be placed inside the regulation loop. The advantages of remote sensing are illustrated in fig ures 1 through 3. Figure 1 shows the device connected as a conventional 3 terminal regulator with the Sense lead connected directly to the output of the device. Rp is the parasitic resistance of the connections between the device and the load . 000 Tr ace A of figure 3 illustrates the effect of Rp. 0000000 Figure 2 shows 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 connected to the bottom of the load. The effect on output regulation can be seen in trace B of figure 3. 0000000000000000000 It i s important to note that the voltage drops due to Rp , are not eliminated; they will add to the dropout voltage of the regulator regardless. The CS 5203 can control 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 voltage drop across Rp , . 0000000000000000000 S E NS E C S 5203 V OUT F IG U R E 1 A B V OUT F IG U R E 2 IO UT TI ME F igure 3 . R em ote Sen si ng Im proves Loa d Reg ulation S ta bil it y Th e c ircuit desi gn used in the CS 520 3 series requires the use of an output capa citor as part of the de vice frequency compensat ion. Th e addition of 150 F aluminum ele ctrolytic or a 22 F sol id tantalum on the output will ensure stability for all operating conditions. 000 000 000 00 4 CS-5203 3 Amp Low Dropout Positive Voltage Regulator Output Voltage In normal operations it is difficult to get those values of surge currents even with the use of large output capacitances. Only with high value output capacitors, such as 1000 F to 500 0 F and the V POWER pin is instantaneously shorted to ground, damage can occur. A diode from output to input is recommended (Fig. 5) The CS5203 (adjustable version) develops a 1.25V reference voltage between the Sense pin and the Adjust pin (Figure 4). Placing a resistor between these two terminals causes a constant current to flow through R1 and down through R2 to set the output voltage. In general R1 is chosen so that this current is the specified minimum load current of 5 mA. The current out of the Adjust pin is small, typically 50 A and it adds to the current from R1. For best regulation the top of the resistor divider should be connected directly to the Sense pin. 00000000000000 V control + V POW ER + D1 P OWE R V OU T OUTP UT + C S 5203 S E NS E AD J . V CONTROL D2 CONTROL V REF R1 + CONTROL V POWER + V OU T OUTP UT 5203 S E NS E P OWE R CS AD J . + V REF R2 R1 F igure 5 . Optional Clamp Diodes Protect against Input 00 00 00 0 Crowbar Circuits I ADJ 50 A V OUT = V REF (1+R2/R1)+ I ADJ R2 R2 If CS5203 is connected as a single supply device with the control and power input pins shorted to get the internal diode between the output and the power input pin will protect the control input pin.0000000000000000000 F igure 4 . Setting Output Voltage Protection Diodes T h e r m a l C o n s id e r a ti o n s In normal operation the CS5203 family does not need any protection diodes between the adjustment pin and the output and from the output to the input to prevent die overstress. Internal resistors limit the internal current paths on the ADJ 1 pin.Therefore even with bypass capacitors on the adjust pin no prote ction diode is needed to ensure device safety under short-circuit conditions . The Adjust pin can be driver on a transient basis 7V with respect to the outpu t without any device degradation.00000000000000000000000000000000000 A protection diode between the Output pin and V POWER pin is not usually needed. Micros econd surge currents of 50A to 100A can be handled by the internal diode between the Output pin and VPOWER pin of the device. 0000 The CS 5203 series have internal power and thermal limiting circuitry designed to protect the device under overload conditions. However maxium junction temperature ratings should not be exceeded under continuous normal load conditions.Careful consideration must be given to all sources ofthermal resistance from junction to ambient, including junction-to-case, case-toheat sink interface and heat sink resistance itself.000000 Junction temperature of the Control section can run up to 125 . Junction temperature of the Power section can run up to 150 . 00000000000000000000000000000000 5 CS-5203 3 Amp Low Dropout Positive Voltage Regulator ORDER INFORMATION Device Output Voltage Package C S 5203T C S 5203T 1 C S 5203D P A dj 1 A dj 1 A dj 1 T O -220 T O -220-5 T O -263 C S 5203T -1.5 C S 5203T 1-1.5 C S 5203D P -1.5 1.5 V 1.5 V 1.5 V T O -220 T O -220-5 T O -263 C S 5203T -2.5 C S 5203T 1-2.5 C S 5203D P -2.5 2.5 V 2.5 V 2.5 V T O -220 T O -220-5 T O -263 2.8 5V 2.8 5V 2.8 5V T O -220 T O -220-5 T O -263 3V 3V 3V T O -220 T O -220-5 T O -263 C S 5203T -3.3 C S 5203T 1-3.3 C S 5203D P -3.3 3.3 V 3.3 V 3.3 V T O -220 T O -220-5 T O -263 C S 5203T -3.5 C S 5203T 1-3.5 C S 5203D P -3.5 3.5 V 3.5 V 3.5 V T O -220 T O -220-5 T O -263 5V 5V 5V T O -220 T O -220-5 T O -263 C S 5203T -2.8 5 C S 5203T 1-2.8 5 C S 5203D P -2.8 5 C S 5203T -3 C S 5203T 1-3 C S 5203D P -3 C S 5203T -5 C S 5203T 1-5 C S 5203D P -5 6