CS-52015 1.5Amp Low Dropout Positive Voltage Regulator FRONT VIEW DESCRIPTION TAB IS V OUT 00000The CS52015 series of positive adjustable and fixed regulators are designed to provide 1.5A with higher efficiency than currently available devices. 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 CS52015 can also be used as a single supply device (3 pin version). On-chip trimming adjusts 3 IN 2 OUT 1 ADJ/GND SOT-223 FRONT VIEW TAB IS V OUT 3 IN 2 OUT 1 ADJ/GND T0-263 3 LEAD TO-220 V IN 3 2 1 V OUT ADJ/GND FRONT VIEW 5 LEAD TO-220 V POWER V CONTROL 5 4 3 2 1 FEATURES OUTPUT ADJUST/GND SENSE FRONT VIEW Adjustable or Fixed Output Output Current of 1.5A Low Dropout,700 mV at 1.5A Output Current 0.04% Line Regulation 0.1% Load Regulation 100% Thermal Limit Burn-In Fast Transient Response Remote Sense Typical application data 2.5V,1.5A regulator 5v V CONTROL VOUT CS52015 3.3v 1F 10V VPOWER V SENSE Adjust 10F 5V 0.1F 5V 2.5v,1.5A R 1 124 1% R 2 124 1% Load 150F 5V V OUT =V REF (1+R2/R1)+I ADJ R2 Absolute Maximum Ratings Symbol PD V IN TJ T STG T LEAD Parameter Power Dissipation Input Voltage V power V control Maximum Internally Limited Units W V 7 13 Operating Junction Temperature Range Control Section Power Transistor Storage Temperature Lead Temperature(Soldering, 10 sec) 1 0 to 125 0 to 150 -65 to 150 300 CS-52015 1.5Amp Low Dropout Positive Voltage Regulator Electrical Characteristics Note 1 Electrical Characteristics at I LOAD = 0 mA and TJ = +25 PARAMETER Reference Voltage Test Conditions Device CS52015 unless otherwise specified. V CONTROL = 2.75V, V POWER = 2V, ILOAD = 10mA V CONTROL = 2.7V to12V, V POWER = 3.3V to 5.5V, ILOAD = 10mA to 1.5A Output Voltage All fixed Versions * V CONTROL = VOU T + 1.5V, VPOWER = VOUT + O.5V, Variation from nominal V OUT V CONTROL = VOUT + 1.5V, VPOWER = VOUT + O.8V, I LOAD = O mA to 1.5A, Variation from nominal V OUT * Min Typ Max Units 1.238 1.250 1.262 V 1.230 1.250 1.270 -1 +1 % -1.6 +1.6 % Line Regulation All I LOAD = 10 mA,(1.5V+ V OUT) 0.8V ( V POWER - V OUT) 5.5V V CONTROL 12V, * 0.04 0.20 Load Regulation All V CONTROL = VOUT + 2.5V, VPOWER = VOUT + O.8V, I LOAD = 10 mA to 1.5A, * 0.08 0.40 Minimum Load Current (Note 2) CS52015 V CONTROL = 5V, VPOWER = 3.3V, VADJ =OV * 1.7 5 mA Control Pin Current (Note3) All V CONTROL = VOUT + 2.5V, VPOWER = VOUT + O.8V, I LOAD = 10 mA to 1.5A, * 30 mA Ground Pin Current All fixed Versions V CONTROL = VOUT + 2.5V, VPOWER = VOUT + O.8V, I LOAD = 10 mA to 1.5A, * 6 10 mA Adjust Pin Current CS52015 V CONTROL = VOUT + 2.75V, VPOWER = 2.05V, I LOAD = 10 mA * 50 120 mA Current Limit All ( V IN - V OUT ) = 3V * Ripple Rejection All V CONTROL = VPOWER =V OUT + 2.5V, VRIPPLE =1 VP -P I LOAD = 750 mA Thermal Regulation Cs52015 % 1.5 2.3 A 60 80 dB 0.003 %/W T A = 25 ,30 ms pulse Dropout Voltage Control Input ( V CONTROL - V OUT ) Power Input All All V POWER = VOUT + O.8V, ILOAD = 10mA 1.00 1.15 V POWER = VOUT + O.8V, ILOAD = 1.5mA * 1.15 1.30 V CONTROL = VOUT + 2.5V, I LOAD = 1.5A * 0.55 0.70 ( V POWER - V OUT ) The * denotes the specifications which apply over the full temperature range. Note 1: Unless otherwise specified Vout = Vsense. For CS52015 (adj) Vadj = OV Note 2: For the adjustable device the minimum load current is the minimum current required to maintain regulation.Normally 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 with a ratio of about 1:100 Note 4: The dropout voltage for the CS52015 is caused by either minimum control voltage or minimum power voltage. The specifications represent the minimum input /output voltage required to maintain 1% regulation. 2 V CS-52015 1.5Amp Low Dropout Positive Voltage Regulator Pin Functions (5-Lead) Sense (Pin 1): This pin is the positive side of the Adjust (Pin 2): This pin is the negative side of the VPOWER (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 Adjust pin is also brought out to allow the user to add a bypass capacitor.00000000 VCONTROL (Pin 4): This pin is the 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 voltage for the device to regulate. GND (Pin 2): For fixed voltage device this is the bottom Output (Pin 3): This is the power output of the device.000 reference voltage. With 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 Block Diagram V CONTROL V POWER + - SENCE V OUT FOR FIXED VOLTAGE DEVICE ADJ1 For adjustable voltage device GND 3 CS-52015 1.5Amp Low Dropout Positive Voltage Regulator Application Information The CS52015 is designed to make use of multiple power supplies, to reduce the dropout voltage. One of the advantages of the two supply approach is maximizing the efficiency.0000000000000000000000000000000000000 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 NPN output transistor. This 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. This 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 CS52015 can also be operated as a single supply device. In single supply operation the dropout will be determined by the minimum control voltage.000000000 Both the fixed and adjustable versions have remote sense pins, permitting very accurate regulation of output voltage. As a result, over an output current range of 100mA to 1.5A, 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 for bypassing the Adjust pin. In addition to the enhancements mentioned, the reference accuracy has been improved a factor of two with a guaranteed initial tolerance of 1% at 25 and 1.6% accuracy over the full temperature and load current range.00000000000000000000000000000000000000000 Typical applications for the CS52015 include 3.3V to 2.5V conversion with 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 device is fully protected against overcurrent and overtemperature conditions.0000000000000000000000000000000000000 5.0V 3.3V CONTROL SENSE POWER CS52015 Rr OUTPUT ADJ1 LOAD R1 R2 Rp1 Figure 1. Conventional Load Sensing 5.0V 3.3V CONTROL POWER SENSE CS52015 OUTPUT ADJ1 Rr LOAD R1 Rp1 R2 Figure 2. Remote Load Sensing ( IOUT)(Rp) A V OUT FIGURE 1 Grounding and Output Sensing B V OUT FIGURE 2 The CS52015 allows true Kelvin sensing for both the high and low side of the load. As a result the voltage regulation at the load can be easily optimized. Voltage 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 figures 1 through 3. Figure 1 shows the device connected as a conventional 3 terminal regulator with the Sense lead connected directly to the connections between the device and the load. Trace A of figure 3 illustrates the effect of Rp.1000000000 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 I OUT TIME Figure 3. Remote Sensing Improves Load Regulation Stability The circuit design used in the CS52015 series requires the use of an output capacitor as part of the device frequency compensation. The addition of 150 F aluminum electrolytic or a 22 F solid tantalum on the output will ensure stability for all operating conditions.00000000000 It is 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 CS52015 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 4 CS-52015 1.5Amp Low Dropout Positive Voltage Regulator Output Voltage 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 5000 F and the VPOWER pin is instantaneously shorted to ground, damage can occur.A diode from output to input is recommended (Figure 5). The CS52015 (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 though R1 and down though 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. V CONTROL V POWER CONTROL POWER OUTPUT V OUT Cs52015 ADJ1 SENSE I ADJ1 V REF R1 50A V CONTROL R2 V OUT = V REF(1+R2/R1)+ I ADJ R 2 V POWER CONTROL POWER OUTPUT V OUT CS52015 Figure 5. Optional Clamp Diodes Protect Against Input Crowbar Circuits ADJ1 SENSE I ADJ1 V REF R1 50A R2 V OUT = V REF(1+R2/R1)+ I ADJ R 2 If CS52015 is connected as a single supply device with the control and power input pins shorted together the internal diode between the output and the power input pin will protect the control input pin. Figure 4. Setting Output Voltage Protection Diodes In normal operation CS52015 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 are limiting the internal current paths on the ADJ1Pin. Therefore even with bypass capacitors on the adjust pin no protection 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 output without any device degradation. A protection diode between the output pin and VPOWER pin is not usually needed.Microsecond surge currents of 50A to 100A can be handled by the internal diode between the the output pin and VPOWER pin of the device.In normal operations it is Thermal Considerations The CS52015 series have internal power and thermal limiting circuitry designed to protect the device under overload conditions. However maximum junction temperature ratings should not be exceeded under continuous normal load conditions. Careful consideration junction to ambient, including junction -to-case, case-to-heat sink inerface and heat sink resistance itself. Junction temperature of the Control section can run up to 125 . Junction temperature of the power section can run up to 150 . 5 CS-52015 1.5Amp Low Dropout Positive Voltage Regulator ORDER INFORMATION ORDER INFORMATION Device Output Voltage Package CS52015ST CS52015T CS52015T1 CS52015DP Adj 1 Adj 1 Adj 1 Adj 1 SOT-223 TO-220 TO-220-5 TO-263 CS52015ST-1.5 CS52015T-1.5 CS52015T1-1.5 CS52015DP 1.5V 1.5V 1.5V 1.5V SOT-223 TO-220 TO-220-5 TO-263 CS52015ST-1.8 CS52015T-1.8 CS52015T1-1.8 CS52015DP-1.8 1.8V 1.8V 1.8V 1.8V SOT-223 TO-220 TO-220-5 TO-263 CS52015ST-2.5 CS52015T-2.5 CS52015T1-2.5 CS52015DP-2.5 2.5V 2.5V 2.5V 2.5V SOT-223 TO-220 TO-220-5 TO-263 2.85V 2.85V 2.85V 2.85V SOT-223 TO-220 TO-220-5 TO-263 3V 3V 3V 3V SOT-223 TO-220 TO-220-5 TO-263 CS52015ST-3.3 CS52015T-3.3 CS52015T1-3.3 CS52015DP-3.3 3.3V 3.3V 3.3V 3.3V SOT-223 TO-220 TO-220-5 TO-263 CS52015ST-3.5 CS52015T-3.5 CS52015T1-3.5 CS52015DP-3.5 3.5V 3.5V 3.5V 3.5V SOT-223 TO-220 TO-220-5 TO-263 5V 5V 5V 5V SOT-223 TO-220 TO-220-5 TO-263 CS52015ST-2.85 CS52015T-2.85 CS52015T1-2.85 CS52015DP-2.85 CS52015ST-3 CS52015T-3 CS52015T1-3 CS52015DP-3 CS52015ST-5 CS52015T-5 CS52015T1-5 CS52015DP-5 6