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| POWER MANAGEMENT Description 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. 50mA Ultra Low Dropout, Low Noise Micropower Linear Regulator PRELIMINARY Features Ultra low dropout voltage - 100mV @ 50mA Guaranteed 50mA output current Low ground pin current at all loads <1A 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) SC2982 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 600A. The output noise is reduced by placing a 10nF capacitor on pin 4 (bypass). Applications Battery Powered Systems Cellular Telephones Cordless Telephones Pagers Personal Digital Assistants Portable Instrumentation Cameras Portable Consumer Equipment PCMCIA Cards 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 1F capacitor on the output for a minimum number of u external components. Typical Application Circuit U1 SC2982 1 VIN 2 3 EN + CIN 1uF VIN GND EN BYP 4 Co 1uF VO 5 VO + CBYP 10nF Notes: (1) CIN is needed if the device is far from the supplys filter capacitors, or for operation from a battery. A value of 1F or greater should be used. CIN may be a tantalum or aluminum electrolytic capacitor. (2) CO should be a 1F 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 Parameter Input Supply Voltage Power D i ssi pati on Thermal Resi stance Juncti on to Ambi ent Thermal Resi stance Juncti on to C ase Operati ng Ambi ent Temperature Range Operati ng Juncti on Temperature Range Storage Temperature Range Lead Temperature (Solderi ng) 10 Sec ESD Rati ng (Human Body Model) Sy mbol VIN PD q JA q JC TA TJ TSTG TLEAD V ESD PRELIMINARY Maximum -0.3 to +20 Internally Li mi ted 256 81 -40 to +85 -40 to +125 -65 to +150 300 2 U nits V W C /W C /W C C C C kV Electrical Characteristics Unless specified: VIN = VO(NOM) + 1V, IO = 100A, CO = 1F, VEN 1.8V. Values in bold apply over the full operating temperature range. Parameter Supply Voltage Range Output Voltage Sy mbol VIN VO Test C onditions Min 2.5 -1 -3 Ty p Max 16 +1 +3 U nits V % Output Voltage Temperature C oeffi ci ent Li ne Regulati on TC REG(LINE) VIN = (VO(NOM) + 1V) to 16V 40 0.06 0.12 0.15 ppm/C %/V Load Regulati on REG(LOAD) IO = 0.1mA to 50mA 0.001 0.004 0.007 %/mA D ropout Voltage(1) VD IO = 100A 5 10 25 mV IO = 50mA 100 150 200 mV Ground Pi n C urrent IGND IO = 100A 80 125 150 A IO = 50mA 600 1000 1500 A VEN < 0.4V (shutdown) a 2001 Semtech Corp. 2 0.01 5 A www.semtech.com SC2982 POWER MANAGEMENT Electrical Characteristics Parameter C urrent Li mi t(2) Ri pple Rejecti on Rati o Thermal Regulati on RMS Output Noi se Enable Input Voltage Sy mbol ILIM PSRR Test C onditions VO > (VO(NOM) - 5%) IO = 100A, f = 100Hz, C BYP = 10nF, C O = 10F Min 200 50 0.05 BW = 300Hz to 50kHz, IO = 1mA, C BYP = 10nF, C O = 10F Low = O/P OFF Hi gh = O/P ON Enable Input C urrent IEN VEN 0.4V VEN 1.8V 1.8 -0.01 5 -1 10 20 30 0.4 Ty p PRELIMINARY Unless specified: VIN = VO(NOM) + 1V, IO = 100A, CO = 1F, VEN 1.8V. Values in bold apply over the full operating temperature range. Max U nits mA db %/W Vrms V V A A VO (%) PD eno V EN 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. a 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 1 2 3 4 5 Pin N ame VIN GND EN BYP VO Pin Function Supply voltage i nput. Ground. Acti ve hi gh enable i nput. C onnect to VIN i f not bei ng used. Reference bypass. C onnect a 10nF capaci tor between thi s pi n and GND to reduce output noi se Voltage output. a 2001 Semtech Corp. 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 a 2001 Semtech Corp. 5 www.semtech.com |
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