CS52015-XX CS52015 CS52015-1 CS52015-2 CS52015-3 CS52015-5 1250C 1500C

1.5 A Low Dropout Positive Voltage Regulator Features Description · · · · · · ·

(CS52015-XX CS52015-XX) 1.5 A Low Dropout Positive Voltage Regulator Features Description · · · · · · · · The CS52015 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 CS52015 can also be used as a single supply device (3 pin version). On-chip trimming adjusts the reference voltage to 1%. 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 Applications · · · High Efficiency Linear Regulators Post Regulators for Switching Supplies Adjustable Power Supply Typical application data 2.5V, 1.5A regulator 5V V C ONT RO L Package information V O UT CS52015 CS52015 3.3V V POW ER 1F µ 10V VOUT = 10F µ 5V 2.5V, 1.5A V SE NSE Adjust 0.1F µ 5V R1 124 1% R2 124 1% 150F µ 5V Load VREF (1+R2/R1) + I ADJ R2 Absolute Maximum Ratings Symbol PD VIN TJ TSTG TLEAD Parameter Power Dissipation Input Voltage Vpower Vcontrol Operating Junction Temperature Range Control Section Power Transistor Storage Temperature Lead Temperature (Soldering, 10 sec) Device Selection Guide Device CS52015 CS52015 CS52015-1 CS52015-1.5 CS52015-1 CS52015-1.8 CS52015-2 CS52015-2.5 CS52015-2 CS52015-2.85 CS52015-3 CS52015-3.0 CS52015-3 CS52015-3.3 CS52015-3 CS52015-3.5 CS52015-5 CS52015-5.0 Maximum Internally Limited Units W V 7 13 oC 0 to 125 0 to150 -65 to 150 300 oC oC (Note1) Output Voltage Adj 1.5V 1.8V 2.5V 2.85V 3.0V 3.3V 3.5V 5.0V Note 1: Other fixed versions are available Vout = 1.5V to 5.0V 1 BEIJING ESTEK ELECTRONICS CO.,LTD (CS52015-XX CS52015-XX) 1.5 A Low Dropout Positive Voltage Regulator Electrical Characteristics (Note 1) Electrical Characteristics at ILOAD = 0 mA and TJ = +25°C unless otherwise specified. Parameter Reference Voltage Output Voltage Device CS52015 CS52015 All fixed versions Test Conditions VCONTROL = 2.75V, VPOWER = 2V, ILOAD = 10mA VCONTROL = 2.7V to 12V, VPOWER = 3.3V to 5.5V, ILOAD = 10mA to 1.5A * Min Typ Max Units V 1.238 1.250 1.262 1.230 1.250 1.270 -1 VCONTROL = VOUT + 1.5V, VPOWER = VOUT + 0.5V, Variation from nominal VOUT +1 % -1.6 +1.6 % VCONTROL = VOUT + 1.5V, VPOWER = VOUT + 0.8V, ILOAD = 0 mA to 1.5A, Variation from nominal VOUT * ILOAD = 10mA, (1.5V+ VOUT) VCONTROL 12V, 0.8V (VPOWER - VOUT) 5.5V VCONTROL = VOUT +2.5V, VPOWER = VOUT + 0.8V, ILOAD = 10mA to 1.5A VCONTROL = 5V, VPOWER = 3.3V, VADJ = 0V * 0.04 0.20 * 0.08 0.40 * 1.7 5 mA 30 mA Line Regulation All Load Regulation All Minimum Load Current (Note 2) Control Pin Current (Note3) CS52015 CS52015 All VCONTROL = VOUT +2.5V, VPOWER = VOUT + 0.8V, ILOAD = 10mA to 1.5A * Ground Pin Current 6 10 mA * 50 120 µA Current Limit Ripple Rejection All All VCONTROL = VOUT +2.5V, VPOWER = VOUT + 0.8V, ILOAD = 10mA to 1.5A VCONTROL = 2.75V, VPOWER = 2.05V, ILOAD = 10mA (VIN - VOUT) = 3V VCONTROL = VPOWER = VOUT + 2.5V, VRIPPLE = 1VP-P, ILOAD = 750mA * Adjust Pin Current All fixed versions CS52015 CS52015 Thermal Regulation CS52015 CS52015 Dropout Voltage Control Input (VCONTROL - VOUT) All Power Input (VPOWER - VOUT) All * 1.5 60 % 2.3 80 A dB 0.003 %/W TA = 25°C, 30 ms pulse Note 4 VPOWER = VOUT +0.8V, ILOAD = 10mA VPOWER = VOUT + 0.8V, ILOAD = 1.5A * 1.00 1.15 1.15 1.30 V CONTROL = VOUT + 2.5V, ILOAD = 1.5A * 0.55 0.70 V The * denotes the specifications which apply over the full temperature range. Note 1: Unless otherwise specified Vout = Vsense. For CS52015 CS52015 (adj) Vadj = 0V 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 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 BEIJING ESTEK ELECTRONICS CO.,LTD (CS52015-XX CS52015-XX) 1.5 A Low Dropout Positive Voltage Regulator Pin Functions (5-Lead) Sense (Pin 1): This pin is the positive side of the reference voltage. With this pin it is possible to Kelvin sense the output voltage at the load. Adjust (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 devices this is the bottom of the resistor divider that sets the output voltage. 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. 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. Output (Pin 3): This is the power output of the device. Block Diagram 3 BEIJING ESTEK ELECTRONICS CO.,LTD 1.5 A Low Dropout Positive Voltage Regulator (CS52015-XX CS52015-XX) Application Information The CS52015 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. 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 tying the control and power inputs together the CS52015 CS52015 can also be operated as a single supply device. In single supply operation the dropout will be determined by the minimum control voltage. 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 0.1µF to 1µF for bypassing the Adjust pin. In addition to the enhancements mentioned, the reference accuracy has been improved a factor of two with a quaranteed initial tolerance of ±1% at 250C and 1.6% accuracy over the full temperature and load current range. Typical applications for the CS52015 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. Grounding and Output Sensing The CS52015 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 output of the device. RP is the parasitic resistance of the connections between the device and the load. Trace A of figure 3 illustrates the effect of Rp. 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. 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 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. 4 5.0V 3.3V CONTROL POWER SENSE CS52015 CS52015 RP OUTPUT ADJ LOAD R1 R2 RP Figure 1. Conventional Load Sensing 5.0V 3.3V CONTROL POWER SENSE CS52015 CS52015 OUTPUT ADJ RP LOAD R1 RP R2 Figure 2. Remote Load Sensing (IOUT)(RP) A VOUT FIGURE 1 B VOUT FIGURE 2 IOUT TIME Figure 3. Remote Sensing Improves Load Regulation Stability The circuit design used in the CS52015 CS52015 series requires the use of an output capacitor as part of the device frequency compensation. The addition of 150µF aluminum electrolytic or a 22µF solid tantalum on the output will ensure stability for all operating conditions. BEIJING ESTEK ELECTRONICS CO.,LTD (CS52015-XX CS52015-XX) Output Voltage The CS52015 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 50µA 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. 1.5 A Low Dropout Positive Voltage Regulator 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 1000µF to 5000µF and the VPOWER pin is instantaneously shorted to ground, damage can occur. A diode from output to input is recommended (Figure 5). VCONTROL + CONTROL V POWER V CONTRO L + + ADJ CONTROL POWER OUTPUT + + VOUT SENSE VREF CS52015 CS52015 ADJ OUTPUT CS52015 CS52015 + V PO WER POWER R1 IADJ V OU T µ 50A R2 SENSE V REF R1 VOUT I ADJ = VREF(1+R2/R1) + IADJ R2 µ 50A R2 V OU T = Figure 5. Optional Clamp Diodes Protect Against Input Crowbar Circuits V REF (1+R2/R1) + I ADJ R2 Figure 4. Setting Output Voltage Protection Diodes In normal operation CS52015 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 ADJ pin. 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 Output pin and VPOWER pin of the device. In 5 If CS52015 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. Thermal Considerations The CS52015 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 must be given to all sources of thermal resistance from junction to ambient, including junction-to-case, case-toheat sink interface and heat sink resistance itself. Junction temperature of the Control section can run up to 1250C 1250C. Junction temperature of the Power section can run up to 1500C 1500C. BEIJING ESTEK ELECTRONICS CO.,LTD (CS52015-XX CS52015-XX) 1.5 A Low Dropout Positive Voltage Regulator Pad Location CS52015-XX CS52015-XX Chip size 2.0 mm x 1.93 mm Pad Location Coordinates N 1 2 3 4 5 6 Pad Name Pad size (µm × µm) Output Output VPOWER (Double Bond Pad)(Note1) VCONTROL (Note1) Sense (Note 1) Adjust (adjustable output) GND (fixed output) 140 140 140 140 140 140 × × × × × × 140 140 300 140 140 140 Coordinates (µm) X 170 1830 1000 816 170 170 Y 1760 1760 1475 1165 675 170 Note 1: For 3-lead version connect 3, 4 pad to VIN and 5 pad to Output 6 BEIJING ESTEK ELECTRONICS CO.,LTD