TC1265 800 mA Fixed-Output CMOS LDO with Shutdown Features Description Very Low Dropout Voltage The TC1265 is a fixed-output, high-accuracy (typically 0.5%) CMOS low dropout regulator. Designed 800 mA Output Current specifically for battery-operated systems, the TC1265s High Output Voltage Accuracy CMOS construction eliminates wasted ground current, Standard or Custom Output Voltages significantly extending battery life. Total supply current Overcurrent and Overtemperature Protection is typically 80 A at full load (20 to 60 times lower than Input for Active Power Management SHDN in bipolar regulators). ERROR Output Can Be Used as a Low Battery Key features of the TC1265 include ultra low noise Detector (SOIC only) operation, very low dropout voltage (typically 450 mV at full load) and fast response to step changes in load. Applications The TC1265 incorporates both overtemperature and overcurrent protection. The TC1265 is stable with an Battery-operated Systems output capacitor of only 1 F and has a maximum Portable Computers output current of 800 mA. It is available in 8-Pin SOIC, Medical Instruments 5-Pin TO-220 and 5-Pin DDPAK packages. Instrumentation Cellular/GSM/PHS Phones Package Type Linear Post-Regulators for SMPS 5-Pin TO-220 5-Pin DDPAK Pagers Front View Tab Is GND Tab Is GND Typical Application TC1265 TC1265 V V V V OUT OUT IN IN + C 1 1F TC1265 12 3 45 3 4 5 12 GND SHDN SHDN 8-Pin SOIC V V 1 8 OUT IN GND 2 7 NC TC1265 SHDN NC 3 6 BYPASS 5 4 ERROR 2006 Microchip Technology Inc. DS21376D-page 1 BYP SHDN GND V IN V OUT BYP SHDN GND V IN V OUTTC1265 Notice: Stresses above those listed underMaximum 1.0 ELECTRICAL Rating may cause permanent damage to the device. This is CHARACTERISTICS a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure Absolute Maximum Ratings to maximum rating conditions for extended periods may affect Input Voltage .........................................................6.5V device reliability. 0.3V) to (V + 0.3V) Output Voltage.................. (V SS IN Power Dissipation................Internally Limited (Note 7) Maximum Voltage on Any Pin ........V +0.3V to -0.3V IN < 125C Operating Temperature Range...... -40C < T J Storage Temperature..........................-65C to +150C DC CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, V = V + 1.5V, (Note 1), I = 100 A, C = 3.3 F, IN R L L SHDN > V , T = +25C. Boldface type specifications apply for junction temperatures of -40C to +125C. IH A Parameters Sym Min Typ Max Units Conditions Input Operating Voltage V 2.7 6.0 V Note 2 IN Maximum Output Current I 800 mA OUTMAX Output Voltage V V 2.5% V 0.5% V + 2.5% VV 2.5V OUT R R R R V 2% V 0.5% V + 3% V = 1.8V R R R R V Temperature Coefficient V /T 40 ppm/C Note 3 OUT OUT Line Regulation V /V 0.007 0.35 %(V + 1V) V 6V OUT IN R IN Load Regulation (Note 4) V /V -0.01 0.002 +0.01 %/mA I = 0.1 mA to I OUT OUT L OUTMAX Dropout Voltage (Note 5) V V 20 30 mV V 2.5V, I = 100 A IN OUT R L 50 160 V 2.5V, I = 100 mA R L 150 480 V 2.5V, I = 300 mA R L 260 800 V 2.5V, I = 500 mA R L 450 1300 V 2.5V, I = 800 mA R L 1000 1200 V = 1.8V, I = 500 mA R L 1200 1400 I = 800 mA L Supply Current I 80 130 A SHDN = V , I = 0 DD IH L Shutdown Supply Current I 0.05 1 A SHDN = 0V SHDN Power Supply Rejection Ratio PSRR 64 db F 1kHz Output Short Circuit Current I 1200 1400 mA V = 0V OUTSC OUT Thermal Regulation V /P 0.04 V/W Note 6 OUT D Output Noise eN 260 nV/Hz I = I , F = 10 kHZ L OUTMAX Note 1: V is the regulator output voltage setting. R 2: The minimum V has to justify the conditions: V V + V and V 2.7V for I = 0.1 mA to I . IN IN R DROPOUT IN L OUTMAX 6 3: ()V V 10 OUTMAX OUTMIN TCV = ------------------------------------------------------------------------- OUT V T OUT 4: Regulation is measured at a constant junction temperature using low duty cycle pulse testing. Load regulation is tested over a load range from 0.1 mA to the maximum specified output current. Changes in output voltage due to heating effects are covered by the thermal regulation specification. 5: Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal value measured at a 1.5V differential. 6: Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation effects. Specifications are for a current pulse equal to I at V = 6V for T = 10 ms. LMAX IN 7: The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction temper- ature and the thermal resistance from junction-to-air (i.e., T , T , ). Exceeding the maximum allowable power dissipa- A J JA tion causes the device to initiate thermal shutdown. Please see Section 5.0 Thermal Considerations for more details. 8: Hysteresis voltage is referenced to V . R DS21376D-page 2 2006 Microchip Technology Inc.