SC2982 50mA Ultra Low Dropout, Low Noise Micropower Linear Regulator POWER MANAGEMENT Description PRELIMINARY Features u u u u u u The SC2982 uses a Semtech proprietary internal PNP device for the pass element, providing a low dropout u voltage of 100mV at a load of 50mA, while maintaining a u u ground pin current of 600µA. The SC2982 is a 50mA ultra low dropout linear regulator with a built in CMOS/TTL logic level enable switch. It is designed specifically for battery powered applications where low quiescent current and low dropout are critical for battery longevity. Ultra low dropout voltage - 100mV @ 50mA Guaranteed 50mA output current Low ground pin current at all loads <1µA quiescent current in shutdown Wide input supply voltage range 2.5V to 16V Wide output voltage range Excellent line regulation Industrial temperature range Surface mount packaging (5 pin SOT-23) Applications The output noise is reduced by placing a 10nF capacitor on pin 4 (bypass). u u Each device contains a bandgap reference, error u amplifier, PNP pass element, thermal and current u limiting circuitry and resistor divider network for setting u output voltage. u The SC2982 is packaged in a 5 pin SOT-23 surface mount u package for a very small footprint and requires only a u 1µF capacitor on the output for a minimum number of u Battery Powered Systems Cellular Telephones Cordless Telephones Pagers Personal Digital Assistants Portable Instrumentation Cameras Portable Consumer Equipment PCMCIA Cards external components. Typical Application Circuit U1 SC2982 1 VIN 2 3 EN + VIN VO 5 VO GND EN BYP CIN 4 + CBYP 10nF 1uF Co 1uF Notes: (1) CIN is needed if the device is far from the supplys filter capacitors, or for operation from a battery. A value of 1µF or greater should be used. CIN may be a tantalum or aluminum electrolytic capacitor. (2) CO should be a 1µF or greater tantalum or aluminum electrolytic capacitor. Larger value capacitors will improve the overall transient response. Due to their very low ESR, ceramic capacitors should not be used. (3) CBYP should be placed as close as possible to pin 4 and ground. A 10nF ceramic capacitor is recommended. (4) EN should be tied to VIN if the shutdown feature is not required. Maximum EN voltage = VIN. Revision 1, January 2001 1 www.semtech.com SC2982 POWER MANAGEMENT Absolute Maximum Ratings PRELIMINARY Parameter Sy mbol Maximum U nits Input Supply Voltage VIN -0.3 to +20 V Power D i ssi pati on PD Internally Li mi ted W Thermal Resi stance Juncti on to Ambi ent q JA 256 °C /W Thermal Resi stance Juncti on to C ase q JC 81 °C /W Operati ng Ambi ent Temperature Range TA -40 to +85 °C Operati ng Juncti on Temperature Range TJ -40 to +125 °C Storage Temperature Range TSTG -65 to +150 °C Lead Temperature (Solderi ng) 10 Sec TLEAD 300 °C ESD Rati ng (Human Body Model) V ESD 2 kV Electrical Characteristics Unless specified: VIN = VO(NOM) + 1V, IO = 100µA, CO = 1µF, VEN ³ 1.8V. Values in bold apply over the full operating temperature range. Parameter Sy mbol Test C onditions Min Ty p Max U nits Supply Voltage Range VIN 2.5 16 V Output Voltage VO -1 +1 % -3 +3 Output Voltage Temperature C oeffi ci ent Li ne Regulati on TC REG(LINE) 40 VIN = (VO(NOM) + 1V) to 16V 0.06 ppm/°C 0.12 %/V 0.15 Load Regulati on REG(LOAD) IO = 0.1mA to 50mA 0.001 0.004 %/mA 0.007 D ropout Voltage(1) VD IO = 100µA 5 10 mV 25 IO = 50mA 100 150 mV 200 Ground Pi n C urrent IGND IO = 100µA 80 125 µA 150 IO = 50mA 600 1000 µA 1500 VEN < 0.4V (shutdown) ã 2001 Semtech Corp. 2 0.01 5 µA www.semtech.com SC2982 POWER MANAGEMENT Electrical Characteristics PRELIMINARY Unless specified: VIN = VO(NOM) + 1V, IO = 100µA, CO = 1µF, VEN ³ 1.8V. Values in bold apply over the full operating temperature range. Parameter C urrent Li mi t(2) Ri pple Rejecti on Rati o Sy mbol Test C onditions Min ILIM VO > (VO(NOM) - 5%) 200 PSRR IO = 100µA, f = 100Hz, C BYP = 10nF, C O = 10µF Thermal Regulati on ∆VO (%) PD RMS Output Noi se eno BW = 300Hz to 50kHz, IO = 1mA, C BYP = 10nF, C O = 10µF Enable Input Voltage V EN Low = O/P OFF Hi gh = O/P ON Enable Input C urrent IEN Ty p Max U nits mA 50 db 0.05 %/W 30 µVrms 0.4 1.8 V V VEN £ 0.4V -0.01 -1 µA VEN ³ 1.8V 5 10 µA 20 Notes: (1) Defined as the input to output differential at which the output voltage drops 100mV below the value measured at a differential of 1V. (2) As the load resistance further decreases, the SC2982 folds back the output current to approximately 150mA at VO = 0V. ã 2001 Semtech Corp. 3 www.semtech.com SC2982 POWER MANAGEMENT Pin Configuration PRELIMINARY Ordering Information D ev ice SC 2982C SK-X.XTR(1)(2) P ackag e 5 pi n SOT-23 Notes: (1) Where -X.X denotes voltage options. Available voltages are: 1.8V, 2.5V, 2.8V, 3.0V, 3.3V, 3.6V, 3.8V, 4.0V and 5.0V. (2) Only available in tape and reel packaging. A reel contains 3000 devices. Block Diagram Pin Descriptions Pin Pin N ame 1 VIN 2 GND 3 EN Acti ve hi gh enable i nput. C onnect to VIN i f not bei ng used. 4 BYP Reference bypass. C onnect a 10nF capaci tor between thi s pi n and GND to reduce output noi se 5 VO Voltage output. ã 2001 Semtech Corp. Pin Function Supply voltage i nput. Ground. 4 www.semtech.com SC2982 POWER MANAGEMENT Outline Drawing - SOT-23-5 PRELIMINARY Land Pattern - SOT-23-5 Contact Information Semtech Corporation Power Management Products Division 652 Mitchell Rd., Newbury Park, CA 91320 Phone: (805)498-2111 FAX (805)498-3804 ã 2001 Semtech Corp. 5 www.semtech.com