TC1174 300mA CMOS LDO with Shutdown and V Bypass REF Features General Description Extremely Low Supply Current (50 A, Typ.) The TC1174 is an adjustable output CMOS low dropout regulator. Total supply current is typically 50 Aat full Very Low Dropout Voltage load (20 to 60 times lower than in bipolar regulators). 300mA Output Current TC1174 key features include ultra low noise operation Adjustable Output Voltages (plus optional Bypass input) very low dropout voltage Power Saving Shutdown Mode (typically 270mV at full load) and internal feed-forward Bypass Input for Ultra Quiet Operation compensation for fast response to step changes in Over Current and Over Temperature Protection load. Supply current is reduced to 0.05 A (typical) and Space-Saving MSOP Package Option V falls to zero when the shutdown input is low. OUT The TC1174 incorporates both over temperature and Applications over current protection. The TC1174 is stable with an output capacitor of only 1 F and has a maximum Battery Operated Systems output current of 300mA. Portable Computers Medical Instruments Typical Application Instrumentation 8 1 Cellular/GSM/PHS Phones V V V V OUT OUT IN IN + C1 Linear Post-Regulators for SMPS 1 F 7 2 Pagers R1 GND NC NC TC1174 470K Device Selection Table 6 Shutdown 3 NC SHDN Control (from Power Output Junction Control Logic) 5 Part Number Voltage Package R2 4 ADJ Bypass Temp. Range (V) C BYPASS 470pF 470K TC1174VOA Adjustable 8-Pin SOIC -40C to +125C (Optional) TC1174VUA Adjustable 8-Pin MSOP -40C to +125C R1 V = V x + 1 OUT REF R2 Package Type 8-Pin MSOP V V 1 8 OUT IN 2 7 GND NC TC1174VUA NC 3 6 SHDN 4 5 ADJ Bypass 8-Pin SOIC V V 1 8 OUT IN GND 2 7 NC TC1174VOA NC 3 6 SHDN ADJ 4 5 Bypass 2002 Microchip Technology Inc. DS21363B-page 1TC1174 *Stresses above those listed underAbsolute Maximum 1.0 ELECTRICAL Rating may cause permanent damage to the device. These CHARACTERISTICS are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the Absolute Maximum Ratings* operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for Input Voltage .........................................................6.5V extended periods may affect device reliability. Output Voltage.................. (V 0.3V) to (V +0.3V) SS IN Power Dissipation................Internally Limited (Note 5) Maximum Voltage on Any Pin ........V +0.3V to -0.3V IN Operating Temperature Range...... -40C < T <125C J Storage Temperature..........................-65C to +150C TC1174 ELECTRICAL SPECIFICATIONS Electrical Characteristics: V =V +1V, I =0.1 A, C =3.3 F, SHDN>V ,T = 25C, unless otherwise noted. Boldface IN OUT L L IH A type specifications apply for junction temperatures of -40C to +125C. Symbol Parameter Min Typ Max Units Test Conditions V Input Operating Voltage 2.7 6.0 V Note 6 IN I Maximum Output Current 300 mA OUTMAX V Reference Voltage 1.165 1.20 1.235 V REF V /TV Temperature Coefficient 40 ppm/C Note 1 OUT OUT V / V Line Regulation 0.05 0.35 %(V +1V) V 6V OUT IN R IN V /V Load Regulation 1.1 2.0 %I = 0.1mA to I (Note 2) OUT OUT L OUTMAX V -V Dropout Voltage 20 30 mV I =0.1mA IN OUT L 80 160 I =100mA L 270 480 I =300mA (Note 3) L I Supply Current 50 90 A SHDN =V SS1 IH I Shutdown Supply Current 0.05 0.5 A SHDN =0V SS2 PSRR Power Supply Rejection Ratio 60 dB F 1kHz RE I Output Short Circuit Current 550 650 mA V =0V OUTSC OUT V / P Thermal Regulation 0.04 V/W Note 4 OUT D eN Output Noise 260 nV/Hz F = 10kHz, I =I L OUTMAX 470pF from Bypass to GND SHDN Input V SHDN Input High Threshold 45 %V IH IN V SHDN Input Low Threshold 15 %V IL IN ADJ Input I Adjustable Input Leakage Current 50 pA ADJ 6 1: TC V =(V V )x10 OUT OUTMAX OUTMIN V x T OUT 2: Regulation is measured at a constant junction temperature using low duty cycle pulse testing. Load regulation is tested over a load range from 0.1mA to the maximum specified output current. Changes in output voltage due to heating effects are covered by the thermal regulation specification. 3: Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at a 1V differential. 4: 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 msec. LMAX IN 5: The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction temperature and the thermal resistance from junction-to-air (i.e., T ,T , ). Exceeding the maximum allowable power dissipation causes the device to initiate A J JA thermal shutdown. Please see Section 4.0 Thermal Considerations for more details. 6: The minimum V has to justify the conditions: V V +V and V 2.7V for I = 0.1mA to I . IN IN R DROPOUT IN L OUTMAX DS21363B-page 2 2002 Microchip Technology Inc.