TC1014

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50mA CMOS LDO WITH SHUTDOWN AND REFERENCE BYPASS TC1014

FEATURES

n Zero Ground Current for Longer Battery Life! n Very Low Dropout Voltage n Guaranteed 50mA Output n High Output Voltage Accuracy n Standard or Custom Output Voltages n Power-Saving Shutdown Mode n Reference Bypass Input for Ultra Low-Noise Operation n Over-Current and Over-Temperature Protection n Space-Saving SOT-23A-5 Package n Pin Compatible Upgrade for MIC5205 and NSC2980

APPLICATIONS

n Battery Operated Systems n Portable Computers n Medical Instruments n Instrumentation n Cellular / GSM / PHS Phones n Linear Post-Regulator for SMPS n Pagers 50mA CMOS LDO WITH SHUTDOWN AND REFERENCE BYPASS TYPICAL APPLICATION TelCom Semiconductor reserves the right to make changes in the circuitry and specifications to its devices. GENERAL DESCRIPTION The TC1014 is a high accuracy (typically ±0.5%) CMOS upgrade for older (bipolar) low dropout regulators such as the LP2980. Designed specifically for battery-operated sys- tems, the TC1014’s CMOS construction eliminates wasted ground current, significantly extending battery life. Total supply current is typically 50µA at full load ( 20 to 60 times lower than in bipolar regulators!). TC1014 key features include ultra low-noise operation (plus optional Bypass input); very low dropout voltage (typically 95mV at full load) and internal feed-forward com- pensation for fast response to step changes in load. Supply current is reduced to less than 1µA when the shutdown input is low. The TC1014 also incorporates both over-tempera- ture and over-current protection. The TC1014 is stable with an output capacitor of only 1µF and has a maximum output current of 100mA. For higher output versions, please see the TC1107, TC1108, TC1173 (I OUT = 300mA) data sheets. 1µF 470pF Reference Bypass Cap (Optional) Shutdown Control (from Power Control Logic) TC1014 VIN 5VIN VOUT BypassSHDN GND VOUT PIN CONFIGURATION

ORDERING INFORMATION

Part No. Voltage **(V) Package Temp. Range TC1014-2.5VCT 2.5 SOT-23A-5* – 40 °C to +125°C TC1014-2.7VCT 2.7 SOT-23A-5* – 40 °C to +125°C TC1014-3.0VCT 3.0 SOT-23A-5* – 40 °C to +125°C TC1014-3.3VCT 3.3 SOT-23A-5* – 40 °C to +125°C TC1014-5.0VCT 5.0 SOT-23A-5* – 40 °C to +125°C NOTE: *SOT-23A-5 is equivalent to the EIAJ (SC-74A) ** Other output voltages available. Please contact TelCom Semiconductor for details NOTE: *SOT-23A-5 is equivalent to the EIAJ (SC-74A) TC1014 (SOT-23A-5*) 1 3 SHDN Bypass GND VOUT VIN TOP VIEW

50mA CMOS LDO WITH SHUTDOWN AND REFERENCE BYPASS PRELIMINARY INFORMATION TC1014-01-6/5/97 ABSOLUTE MAXIMUM RATINGS* J < 125°C *Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS: VIN = VOUT + 1V, IL = 100µA, CL = 3.3µF, SHDN > VIH, TA = 25°C, unless otherwise noted. Boldface type specifications apply for junction temperatures of – 40°C to +125°C. Symbol Parameter Test Conditions Min Typ Max Units VIN Input Operating Voltage — — 6.5 V IOUT MAX Maximum Output Current 50 —— m A VOUT Output Voltage Note 1 VR – 2.5% VR ±0.5% VR + 2.5% V TCV OUT VOUT Temperature Coefficient Note 2 20 — ppm/ °C ΔVOUT /ΔVIN Line Regulation (V R + 1V) < VIN < 6V — 0.01 — % ΔVOUT /VOUT Load Regulation I L = 1.0mA to IOUT MAX — 0.5 — % (Note 3) VIN – VOUT Dropout Voltage (Note 4) I L = 100µA— 5 — m V IL = 20mA 65 IL = 50mA 95 (Note 4) IGND Ground Pin Current I L = IOUT MAX, (Note 5) —— 0 µA IIN Supply Current SHDN = V IH, IL = 0 — 50 — µA IINSD Shutdown Supply Current SHDN = 0V — — 0.05 µA PSRR Power Supply Rejection Ratio F RE ≤ 1kHz — 64 — dB IOUT SC Output Short Circuit Current V OUT = 0V — 200 400 mA ΔVOUT /ΔPD Thermal Regulation Note 6 — 0.04 — %/W eN Output Noise I L = IOUT MAX — 260 — nV/ √Hz 470pF from Bypass to GND SHDN Input VIH SHDN Input High Threshold V IN = 2.5V to 6.5V 45 — — %V IN VIL SHDN Input Low Threshold V IN = 2.5V to 6.5V — — 15 %V IN 2. TCV OUT = (VOUT MAX – VOUT MIN ) x 10 6 VOUT x ΔT 3. Regulation is measured at a constant junction temperature using low duty cycle pulse testing. Load regulation is tested over a load range from 1.0mA to the maximum specified output current. Changes in output voltage due to heating effects are covered by the thermal regulation specification. 4. Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value at a 1V differential. 5. Ground pin current is the regulator pass transistor gate current. The total current drawn from the input supply is the sum of the load current, ground current and supply current (i.e. IIN = ISUPPLY + IGND + ILOAD ). 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 ILMAX at VIN = 6V for T = 10msec. 7. 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. TA, TJ, θJA). Exceeding the maximum allowable power dissipation causes the device to initiate thermal shutdown. Please see Thermal Considerations section of this data sheet for more details.

50mA CMOS LDO WITH SHUTDOWN AND REFERENCE BYPASS PRELIMINARY INFORMATION TC1014-01-6/5/97 PD ≈ (VINMAX – VOUT MIN )ILOAD MAX Where: PD = Worst case actual power dissipation VINMAX = Maximum voltage on VIN VOUT MIN = Minimum regulator output voltage ILOAD MAX = Maximum output (load) current Equation 1. The maximum allowable power dissipation (Equation 2) is a function of the maximum ambient temperature (TAMAX ), the maximum allowable die temperature (125°C) and the thermal resistance from junction-to-air (θJA ). The SOT-23A-5 package has a θJA of approximately 220°C/Watt when mounted on a single layer FR4 dielectric copper clad PC board. PD MAX = (TJMAX – TJMAX ) θJA Where all terms are previously defined. Equation 2. Equation 1 can be used in conjunction with Equation 2 to ensure regulator thermal operation is within limits. For example: Given: V INMAX = 3.0V ±5% VOUT MIN = 2.7V ±0.5V ILOAD = 40mA TAMAX = 55°C Find: 1. Actual power dissipation 2. Maximum allowable dissipation Actual power dissipation: PD ≈ (VINMAX – VOUT MIN )ILOAD MAX = 18.5mW Maximum allowable power dissipation: PD MAX = (TJMAX – TAMAX ) θJA = (125 – 55) 220 = 318mW In this example, the TC1014 dissipates a maximum of only 60mW; far below the allowable limit of 318mW. In a similar manner, Equation 1 and Equation 2 can be used to calculate maximum current and/or input voltage limits. For example, the maximum allowable V IN is found by sustituting the maximum allowable power dissipation of 318mW into Equation 1, from which V INMAX = 5.9V. Layout Considerations The primary path of heat conduction out of the package is via the package leads. Therefore, layouts having a ground plane, wide traces at the pads, and wide power supply bus lines combine to lower θ JA and, therefore, increase the maximum allowable power dissipation limit.

50mA CMOS LDO WITH SHUTDOWN AND REFERENCE BYPASS Sales Offices TelCom Semiconductor

1300 Terra Bella Avenue

P.O. Box 7267 Mountain View, CA 94039-7267 TEL: 415-968-9241 FAX: 415-967-1590 E-Mail: liter@c2smtp.telcom-semi.com Printed in the U.S.A. TelCom Semiconductor H.K. Ltd.

10 Sam Chuk Street, 6/F

TEL: 852-2324-0122 FAX: 852-2354-9957 TelCom Semiconductor Austin Product Center 9101 Burnet Rd. Suite 214 Austin, TX 78758 TEL: 512-873-7100 FAX: 512-873-8236 SOT-23A-5* PACKAGE DIMENSIONS Dimensions: inches (mm) .071 (1.80) .059 (1.50) .122 (3.10) .098 (2.50) .020 (0.50) REFERENCE .122 (3.10) .106 (2.70) .057 (1.45) .035 (0.90) .006 (0.15) .000 (0.00) .022 (0.55) .008 (0.20) .004 (0.09) SOT-23A-5 a & b = part number code + temperature range and voltage TC1014 (V) Code 2.5 A1 2.7 A2 3.0 A3 3.3 A5 5.0 A7 c represents year and quarter code d represents lot ID number NOTE: *SOT-23A-5 is equivalent to the EIAJ (SC-74A) MARKING

100mA CMOS LDO WITH SHUTDOWN AND REFERENCE BYPASS TC1015 n Zero Ground Current for Longer Battery Life! n Very Low Dropout Voltage n Guaranteed 100mA Output n High Output Voltage Accuracy n Standard or Custom Output Voltages n Power-Saving Shutdown Mode n Reference Bypass Input for Ultra Low-Noise Operation n Over-Current and Over-Temperature Protection n Space-Saving SOT-23A-5 Package n Pin Compatible Upgrade for MIC5205 and NSC2980 n Battery Operated Systems n Portable Computers n Medical Instruments n Instrumentation n Cellular / GSM / PHS Phones n Linear Post-Regulator for SMPS n Pagers 100mA CMOS LDO WITH SHUTDOWN AND REFERENCE BYPASS TYPICAL APPLICATION TelCom Semiconductor reserves the right to make changes in the circuitry and specifications to its devices. GENERAL DESCRIPTION The TC1015 is a high accuracy (typically ±0.5%) CMOS upgrade for older (bipolar) low dropout regulators such as the LP2980. Designed specifically for battery-operated sys- tems, the TC1015’s CMOS construction eliminates wasted ground current, significantly extending battery life. Total supply current is typically 50µA at full load ( 20 to 60 times lower than in bipolar regulators!). TC1015 key features include ultra low-noise operation (plus optional Bypass input); very low dropout voltage (typi- cally 200mV at full load) and internal feed-forward compen- sation for fast response to step changes in load. Supply current is reduced to 0.05µA and V OUT is disabled when the shutdown input is low. The TC1015 also incorporates both over-temperature and over-current protection. The TC1015 is stable with an output capacitor of only 1µF and has a maximum output current of 100mA. For higher output versions, please see the TC1107, TC1108, TC1173 (I OUT = 300mA) data sheets. 1µF 470pF Reference Bypass Cap (Optional) Shutdown Control (from Power Control Logic) TC1015 VIN 5VIN VOUT BypassSHDN GND VOUT PIN CONFIGURATION Part No. Voltage **(V) Package Temp. Range TC1015-2.5VCT 2.5 SOT-23A-5* – 40 °C to +125°C TC1015-2.7VCT 2.7 SOT-23A-5* – 40 °C to +125°C TC1015-3.0VCT 3.0 SOT-23A-5* – 40 °C to +125°C TC1015-3.3VCT 3.3 SOT-23A-5* – 40 °C to +125°C TC1015-5.0VCT 5.0 SOT-23A-5* – 40 °C to +125°C NOTE: *SOT-23A-5 is equivalent to the EIAJ (SC-74A) ** Other output voltages available. Please contact TelCom Semiconductor for details NOTE: *SOT-23A-5 is equivalent to the EIAJ (SC-74A) TC1015 (SOT-23A-5*) TOP VIEW1 3 SHDN Bypass GND VOUT VIN

100mA CMOS LDO WITH SHUTDOWN AND REFERENCE BYPASS PRELIMINARY INFORMATION TC1015-01-6/5/97 ABSOLUTE MAXIMUM RATINGS* J < 125°C *Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS: VIN = VOUT + 1V, IL = 100µA, CL = 3.3µF, SHDN > VIH, TA = 25°C, unless otherwise noted. Boldface type specifications apply for junction temperatures of – 40°C to +125°C. Symbol Parameter Test Conditions Min Typ Max Units VIN Input Operating Voltage — — 6.5 V IOUT MAX Maximum Output Current 100 —— m A VOUT Output Voltage Note 1 VR – 2.5% VR ±0.5% VR + 2.5% V TCV OUT VOUT Temperature Coefficient Note 2 20 — ppm/ °C ΔVOUT /ΔVIN Line Regulation (V R + 1V) < VIN < 6V — 0.01 — % ΔVOUT /VOUT Load Regulation I L = 1.0mA to IOUT MAX — 0.5 — % (Note 3) VIN – VOUT Dropout Voltage (Note 4) I L = 0.1mA — 20 — mV IL = 20mA 70 IL = 50mA 93 IL =100mA 112 (Note 4) IGND Ground Pin Current I L = IOUT MAX, (Note 5) —— 0 µA IIN Supply Current SHDN = V IH, IL = 0 — 50 — µA IINSD Shutdown Supply Current SHDN = 0V — — 0.05 µA PSRR Power Supply Rejection Ratio F RE ≤ 1kHz — 64 — dB IOUT SC Output Short Circuit Current V OUT = 0V — 300 500 mA ΔVOUT /ΔPD Thermal Regulation Note 6 — 0.04 — %/W eN Output Noise I L = IOUT MAX — 260 — nV/ √Hz 470pF from Bypass to GND SHDN Input VIH SHDN Input High Threshold V IN = 2.5V to 6.5V 45 — — %V IN VIL SHDN Input Low Threshold V IN = 2.5V to 6.5V — — 15 %V IN 2. TCV OUT = (VOUT MAX – VOUT MIN ) x 10 6 VOUT x ΔT 3. Regulation is measured at a constant junction temperature using low duty cycle pulse testing. Load regulation is tested over a load range from 1.0mA to the maximum specified output current. Changes in output voltage due to heating effects are covered by the thermal regulation specification. 4. Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value at a 1V differential. 5. Ground pin current is the regulator pass transistor gate current. The total current drawn from the input supply is the sum of the load current, ground current and supply current (i.e. IIN = ISUPPLY + IGND + ILOAD ). 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 ILMAX at VIN = 6V for T = 10msec. 7. 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. TA, TJ, θJA). Exceeding the maximum allowable power dissipation causes the device to initiate thermal shutdown. Please see Thermal Considerations section of this data sheet for more details.

100mA CMOS LDO WITH SHUTDOWN AND REFERENCE BYPASS Pin No. 1V IN Unregulated supply input. 2 GND Ground terminal. 3 SHDN Shutdown control input. The regulator is fully enabled when a logic high is applied to this input. The regulator enters shutdown when a logic low is applied to this input. During shutdown, output voltage falls to zero, and supply current is reduced to under 1 microamp (typical). 4 Bypass Reference bypass input. Connecting a 470pF to this input further reduces output noise. 5V OUT Regulated voltage output. PIN DESCRIPTION (SOT-23A-5) Symbol Description DETAILED DESCRIPTION The TC1015 is a precision fixed output voltage regula- tor. (If an adjustable version is desired, please see the TC1070 or TC1071 data sheets.) Unlike the bipolar regula- tors, the TC1015 supply current does not increase with load current. In addition, V OUT remains stable and within regula- tion at very low load currents (an important consideration in RTC and CMOS RAM battery back-up applications). Figure 1 shows a typical application circuit. The regula- tor is enabled any time the shutdown input (SHDN) is at or above V IH, and shutdown (disabled) when SHDN is at or below VIL. SHDN may be controlled by a CMOS logic gate, or I/O port of a microcontroller. If the SHDN input is not required, it should be connected directly to the input supply. While in shutdown, supply current decreases to 0.05µA (typical) and V OUT falls to zero volts. Bypass Input A 470pF capacitor connected from the Bypass input to ground reduces noise present on the internal reference, which in turn significantly reduces output noise. If output noise is not a concern, this input may be left unconnected. Larger capacitor values may be used, but results in a longer time period to rated output voltage when power is initially applied. Output Capacitor A 1µF (min) capacitor from VOUT to ground is recom- mended. The output capacitor should have an effective series resistance of 5Ω or less, and a resonant frequency above 1MHz. A 1µF capacitor should be connected from V IN to GND if there is more than 10 inches of wire between the regulator and the AC filter capacitor, or if a battery is used as the power source. Aluminum electrolytic or tantalum capaci- tor types can be used. (Since many aluminum electrolytic capacitors freeze at approximately – 30°C, solid tantalums are recommended for applications operating below – 25°C.) When operating from sources other than batteries, supply- noise rejection and transient response can be improved by increasing the value of the input and output capacitors and employing passive filtering techniques. Thermal Considerations Thermal Shutdown Integrated thermal protection circuitry shuts the regula- tor off when die temperature exceeds 160°C. The regulator remains off until the die temperature drops to approximately 150°C. Power Dissipation The amount of power the regulator dissipates is prima- rily a function of input and output voltage, and output current. The following equation is used to calculate worst case actual power dissipation:Figure 1. Typical Application Circuit 1µF 470pF Reference Bypass Cap (Optional) Shutdown Control (to CMOS Logic or Tie to V IN if Unused) TC1015 VIN BATTERY VOUT BypassSHDN GND VOUT 1µF

100mA CMOS LDO WITH SHUTDOWN AND REFERENCE BYPASS PRELIMINARY INFORMATION TC1015-01-6/5/97 PD ≈ (VINMAX – VOUT MIN )ILOAD MAX Where: PD = Worst case actual power dissipation VINMAX = Maximum voltage on VIN VOUT MIN = Minimum regulator output voltage ILOAD MAX = Maximum output (load) current Equation 1. The maximum allowable power dissipation (Equation 2) is a function of the maximum ambient temperature (TAMAX ), the maximum allowable die temperature (125°C) and the thermal resistance from junction-to-air (θJA ). The SOT-23A-5 package has a θJA of approximately 220°C/Watt when mounted on a single layer FR4 dielectric copper clad PC board. PD MAX = (TJMAX – TJMAX ) θJA Where all terms are previously defined. Equation 2. Equation 1 can be used in conjunction with Equation 2 to ensure regulator thermal operation is within limits. For example: Given: V INMAX = 3.0V ±10% VOUT MIN = 2.7V ±0.5V ILOAD = 98mA TAMAX = 55°C Find: 1. Actual power dissipation 2. Maximum allowable dissipation Actual power dissipation: PD ≈ (VINMAX – VOUT MIN )ILOAD MAX = 60mW Maximum allowable power dissipation: PD MAX = (TJMAX – TAMAX ) θJA = (125 – 55) 220 = 318mW In this example, the TC1015 dissipates a maximum of only 60mW; far below the allowable limit of 318mW. In a similar manner, Equation 1 and Equation 2 can be used to calculate maximum current and/or input voltage limits. For example, the maximum allowable V IN is found by sustituting the maximum allowable power dissipation of 318mW into Equation 1, from which V INMAX = 5.9V. Layout Considerations The primary path of heat conduction out of the package is via the package leads. Therefore, layouts having a ground plane, wide traces at the pads, and wide power supply bus lines combine to lower θ JA and, therefore, increase the maximum allowable power dissipation limit.

100mA CMOS LDO WITH SHUTDOWN AND REFERENCE BYPASS Sales Offices TelCom Semiconductor P.O. Box 7267 Mountain View, CA 94039-7267 TEL: 415-968-9241 FAX: 415-967-1590 E-Mail: liter@c2smtp.telcom-semi.com Printed in the U.S.A. TelCom Semiconductor H.K. Ltd. TEL: 852-2324-0122 FAX: 852-2354-9957 TelCom Semiconductor Austin Product Center 9101 Burnet Rd. Suite 214 Austin, TX 78758 TEL: 512-873-7100 FAX: 512-873-8236 SOT-23A-5* PACKAGE DIMENSIONS Dimensions: inches (mm) .071 (1.80) .059 (1.50) .122 (3.10) .098 (2.50) .020 (0.50) REFERENCE .122 (3.10) .106 (2.70) .057 (1.45) .035 (0.90) .006 (0.15) .000 (0.00) .022 (0.55) .008 (0.20) .004 (0.09) SOT-23A-5 a & b = part number code + temperature range and voltage TC1015 (V) Code 2.5 B1 2.7 B2 3.0 B3 3.3 B5 5.0 B7 c represents year and quarter code d represents lot ID number NOTE: *SOT-23A-5 is equivalent to the EIAJ (SC-74A) MARKING