CAT6218 300 mA CMOS LDO Regulator Description The CAT6218 is a 300 mA CMOS low dropout regulator that provides fast response time during load current and line voltage CAT6218 VIN VOUT V IN LDO EN V VIN VOUT V IN OUT V OUT C IN 2.3 V C OUT to 5.5 V 1 F 1 F CAT6218 Shutdown Reference BYP OFF EN BYP Switch ON C (Optional) BYP GND 10 nF GND Figure 1. Typical Application Circuit Figure 2. CAT6218 Functional Block Diagram Pin Function VIN is the supply pin for the LDO. A small 1 F ceramic The capacitor should be located near the device. ESR bypass capacitor is required between the V pin and ground domain is 5 m to 500 m . V can deliver a maximum IN OUT near the device. When using longer connections to the power guaranteed current of 300 mA. For inputtooutput voltages supply, C value can be increased without limit. The higher than 1 V, a continuous 300 mA output current might IN operating input voltage range is from 2.3 V to 5.5 V. turnon the thermal protection. A 250 internal shutdown switch discharges the output capacitor in the noload EN is the enable control logic (active high) for the regulator condition. output. It has a 2.5 M pulldown resistor, which assures that if EN pin is left open, the circuit is disabled. GND is the ground reference for the LDO. The pin must be connected to the ground plane on the PCB. VOUT is the LDO regulator output. A small 1 F ceramic bypass capacitor is required between the V pin and BYP is the reference bypass pin. An optional 0.01 F OUT ground for stability. For better transient response, its value capacitor can be connected between BYP pin and GND to can be increased to 4.7 F. reduce the output noise and enhance the PSRR at high frequency. Table 1. ABSOLUTE MAXIMUM RATINGS Parameter Rating Unit V 0 to 6.5 V IN V , V 0.3 to V + 0.3 V EN OUT IN Junction Temperature, T +150 C J Power Dissipation, P Internally Limited (Note 1) mW D Storage Temperature Range, T 65 to +150 C S Lead Temperature (soldering, 5 sec.) 260 C ESD Rating (Human Body Model) 3 kV Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. Table 2. RECOMMENDED OPERATING CONDITIONS (Note 2) Parameter Range Unit V 2.3 to 5.5 V IN V 0 to V V EN IN Junction Temperature Range, T 40 to +125 C J Package Thermal Resistance (SOT23 5), 235 C/W JA NOTE: Typical application circuit with external components is shown above. 1. The maximum allowable power dissipation at any T (ambient temperature) is P = (T T )/ . Exceeding the maximum allowable A Dmax Jmax A JA power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. 2. The device is not guaranteed to work outside its operating rating.