CS5203

CS5203 FCI

Document overview

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Technical content

CS-5203 3 Amp Low Dropout Postitive Voltage Regulator 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 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.

FEATURES

(3 pin version). Symbol P D V IN T J T STG T LEAD Storage Temperature Lead Temperature (Soldering, 10sec) -65 to 15 0 300 Units W V Parameter Power Dissipation Input Voltage Vpower Vcontrol Operating Junction Temperature Range Control Section Internally Limited Limi 0 to 125 0 to 150 Absolute Maximum Ratings

DESCRIPTION

3 L E A D T O -2 2 0

5 L E A D T O -220

3.3V 2.5V,3A R 1 124 R 2 124 0.1 F 10 F 1 F 10V 150 F Typical application data 2.5V ,3A regulator Load V CONTROL VPOWER V =V (1+R2/R1)+I R2OUT REF ADJ V SENSE V OUT Cs5203 Adjust FRONT VIEW T0-263 IN OUT ADJ/GND TAB IS V OUT Maximum PowerTransistor

Electrical Characteristics(Note 1) Electrical Characteristics at I =0 mA and T =+25 unless otherwise specifiedLOAD J The * denotes the specifications which apply over the full temperature range. Note 1:Unless otherwise specified V = V . For CS5203(adj) V = 0Vout sense adj Note 2:For the adjustable device the minimum load current is the minimum c urrent required to maintain in requlation.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 CS5203 is caused by eithe r minimum contro l voltag e o r minimum powe r voltage. The specifications represent the minimum input/output voltage required to maintain 1% regulation. OOOO OOOO OOOO Parameter Device Min Max UnitsTypTest Conditions V 2.75V,V 2V, I =10mACONTROL = POWER = LOAD V 2.7V to 12V,CONTROL = V 3.3V to 5.5V, ILOAD =10mA to3 APOWER = V =4V, V =2VCONTR OL POWER V =3V, V =2.3V , I =0mA to3 ACONTR OL POWER LOAD V =5V, V =3.3VCONTR OL POWER V =4V, V =3.3V , I =0mA to3ACONTR OL POWER LOAD V =6V, V =4VCONTR OL POWER V =5V, V =4.3V , =0mA to3 ACONTR OL POWER ILOAD V =5.5V , V =3.5VCONTR OL POWER V =4.5V , V =3.8V , I =0mA to3 ACONTR OL POWER LOAD V =7.5V , V =5.5VCONTR OL POWER V =6.5V , V =5.8V , I =0mA to3 ACONTR OL POWER LOAD I =10mA,(1.5V+ V ) V 12V,LOAD OUT CONTROL 0.8V (V -V ) 5.5VPOWER OUT V =V +2.5V, V =V +0.8V,CONTROL OUT POWER OUT I =10mA to 1ALOAD V =V +2.5V, V =V +0.8V,CONTROL OUT POWER OUT IL =10mA to 3 AOAD V =V +2.5V, V =V +0.8V,CONTROL OUT POWER OUT I =10mA to 3ALOAD V =2.75V, V =2.05 V,CONTROL POWER I =10mALOAD V =V =V +2.5V , V =1VCONTR OL POWER OUT RIPPLE P-P , I =1.5ALOAD V =V +0.8V, I =10mAPOWER OUT LOAD V =V +0.8V, I =3APOWER OUT LOAD V =V +2.5 V , I =3ACONTROL OUT LOAD (V -V )=3VIN OUT V =5V, V =3.3V, V =0VCONTROL POWER ADJ V =5.8V , V =3.8VCONTR OL POWER V =4.8V , V =4.1V , I =0mA to3 ACONTR OL POWER LOAD V =5.35V , V 3.35VCONTR OL POWER = V =4.4V , V 3.7V , I =0mAto3 ACONTR OL POWER = LOAD CS5203 CS5203 -1.5 CS5203 -2.5 CS5203 -2.85 CS5203 -3.0 CS5203 -3.3 CS5203 -3.5 CS5203 -5.0 All All All All All All All CS5203 1.238 1.250 1.262 1.230 1.250 1.270 1.485 1.475 1.500 1.500 1.515 1.525 2.475 2.460 2.500 2.500 2.525 2.540 2.821 2.805 2.850 2.850 2.879 2.895 2.970 2.950 3.000 3.000 3.030 3.050 3.267 3.247 3.300 3.300 3.333 3.353 3.465 3.445 3.500 3.500 3.535 3.555 4.950 4.920 5.000 5.000 0.04 0.20 0.08 0.40 1.7 5 5 10 50 120 0.003 1.00 1.15 1.15 1.30 0.55 0.70 5.050 5.080 CS5203 CS5203 T A =25 ,30ms pulse Note 4 C S 5203-1. 5/ -2. 5/-2. 85 -3. 0/-3. 3/-3. 5 -5. 0 Output Voltage Line Regulation Load Regulation Minimum Load Current (Note 2) Control Pin Current (Note 3) Ground Pin Current Adjust Pin Current Current Limit Ripple Rejection Thermal Regulation Dropout V oltage Control lnput (V - V )CONTROL OUT Power lnput (V - V )POWER OUT V V V V V V V V V V mA mA mA A A dB %/W CS-5203 3 Amp Low Dropout Positive Voltage Regulator Reference Voltage

PIN FUNCTION ( 5-L e a d) B lo c k D ia g r a m Sense (Pin 1) : T his pin is the positive side of the reference voltage. W ith this pin it is possible to Kelvin Sense the output voltage at the load. Ad jus t 0000000000000000 00000000 000000 (Pin 2) : This pin is the negative side of the 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. GND (Pin 2 ): For fixed voltage device this is the bottom of the resistor divider that sets the output voltage. V (Pin 5): This pin is the collector of the powerPOWER 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 000 V (Pin 4): This pin is t he supply pin for the controlCO NTROL 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. Ou tput (Pin 3): This is the power output of the device. V CONTROL V OUT SENSE FOR FIXED VOLTAGE voltage For adjustable DEVICE device GND ADJ 1 V POWER CS-5203 3 Amp Low Dropout Positive Voltage Regulator

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 For best regulation the top of the resistor divider should be connected directly to the Sense pin.00000000000000 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 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. 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. 00000000000000000000000000000000000 0000 Output Voltage Protection Diodes 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 pin isPOWER instantaneously shorted to ground, damage can occur. A diode from output to input is recommended (Fig. 5) 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 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-to- heat sink interface 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 . 000000 00000000000000000000000000000000 T h e r m a l C o n s id e r a tio n s CONTROL CONTROL R 2 R 2 R 1 R 1 D 1 D 2 V OU T V OU T V CONTROL V V POWER V POW ER C S 5203 C S 5203 AD J . AD J . P O W E R P O W E R O U T P U T O U T P U T S E N S E S E N S E F igure 4 . Setting Output Voltage V =V (1+R2/R1)+ I R2ADJOUT REF F igure 5 . Optional Clamp Diodes Protect against Input Crowbar Circuits 00 00 00 0 IADJ 50 A V REF V REF CS-5203 3 Amp Low Dropout Positive Voltage Regulator control In normal operations it is difficult to get those values of it adds to the current from R1.

C S 5203T -1.5 C S 5203T 1-1.5 C S 5203D P -1.5 C S 5203T -2.5 C S 5203T 1-2.5 C S 5203D P -2.5 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 -3.3 C S 5203T 1-3.3 C S 5203D P -3.3 C S 5203T -3.5 C S 5203T 1-3.5 C S 5203D P -3.5 C S 5203T -5 C S 5203T 1-5 C S 5203D P -5 T O -220 T O -220-5 T O -263 T O -220 T O -220-5 T O -263 T O -220 T O -220-5 T O -263 T O -220 T O -220-5 T O -263 T O -220 T O -220-5 T O -263 T O -220 T O -220-5 T O -263 T O -220 T O -220-5 T O -263 T O -220 T O -220-5 T O -263 A dj A dj A dj 1.5 V 1.5 V 1.5 V 2.5 V 2.5 V 2.5 V 2.8 5V 2.8 5V 2.8 5V 3.3 V 3.3 V 3.3 V 3.5 V 3.5 V 3.5 V Output Voltage Package CS-5203 3 Amp Low Dropout Positive Voltage Regulator