SC11233CSK.TR

POWER MANAGEMENT Description The SC112 is a 150mA ultra low dropout linear regulator with a built in CMOS/TTL logic level enable, designed specifically for battery powered applications where low quiescent current and low dropout are critical for battery longevity. 150mA Ultra Low Dropout Micropower Linear Regulator PRELIMINARY Features Low dropout voltage SC112 u u u u u u The SC112 uses a Semtech proprietary internal PNP device for the pass element, providing a low dropout u u voltage of 130mV at a load of 60mA. u The output noise is reduced to 30µV (typical) by placing a very low leakage 10nF capacitor on pin 3 (noise bypass). Each device contains a bandgap reference, error amplifier, PNP pass element, thermal and current limiting circuitry and resistor divider network for setting output voltage. CMOS/TTL compatible control switch Very low quiescent current 60µA (ON, no load) Internal thermal shutdown Short circuit protection Very low standby current 0.1µA maximum (OFF) Low noise with external bypass capacitor Industrial temperature range SOT-23-6 package Applications Battery powered systems Cellular telephones Cordless telephones Pagers Personal digital assistants Portable instrumentation Low voltage systems u u u u u u The SC112 is packaged in a six lead SOT-23 surface mount package for a very small footprint and it requires u only a 1µF capacitor on the output and a 0.01µF on the bypass pin for a minimum number of external components. Typical Application Circuit U1 SC112 EN 1 2 3 EN VIN 6 5 4 VO VIN GND GND BYP VO C1 10nF C2 1uF C3 1uF Notes: (1) CIN (C3) is needed if the device is far from the supply’s filter capacitors, or for operation from a battery. A value of 1.0µF or greater should be used. CIN may be tantalum or ceramic. (2) CO (C2) should be a 1µF or greater tantalum or ceramic capacitor, with an Equivalent Series Resistance (ESR) between 10mW and 1W over temperature. Larger value capacitors will improve the overall transient response. (3) CBYP (C1 - required) should be placed as close as possible to pin 3 and ground. A 10nF ceramic capacitor is recommended. (4) EN may be tied to VIN if the shutdown feature is not required. Maximum EN voltage = VIN. (5) Connect both ground pins (2 and 5) to ground to maximize heat conduction. Revision 1, January 2001 1 www.semtech.com SC112 POWER MANAGEMENT Absolute Maximum Ratings Parameter Input Supply Voltage Enable Input 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 V EN PD q JA q JC TA TJ TSTG TLEAD V ESD Maximum -0.3 to +16 -0.3 to VIN Internally Li mi ted 230 81 -40 to +85 -40 to +125 -65 to 150 300 2 PRELIMINARY U nits V V W °C /W °C /W °C °C °C °C kV Electrical Characteristics Unless specified: TA = 25°C, VIN = (VO(NOM) + 1V), CIN = 1µF, CBYP = 10nF, CO = 1µF. Values in bold apply over full operating temperature range. Parameter VIN Supply Voltage Range Ground Pi n C urrent Sy mbol Test C onditions Min Ty p Max U nits VIN IGND IO = 0mA 2.5 60 14.5 75 90 V µA IO = 60mA 1.00 1.25 1.50 mA IO = 100mA 2.1 2.5 3.0 IO = 150mA 4.20 4.75 5.25 VIN = 8V, Output OFF VO Output Voltage VO IO = 30mA -2.5 -3.0 Li ne Regulati on REG(LINE) VIN = (VO(NOM) + 1V) to (VO(NOM) + 6V), IO = 1mA 5 VO 0.1 µA +2.5 +3.0 10 20 % mV ã 2001 Semtech Corp. 2 www.semtech.com SC112 POWER MANAGEMENT Electrical Characteristics (Cont.) Parameter VO (C ont.) Load Regulati on REG(LOAD) IO = 1mA to 60mA IO = 1mA to 100mA IO = 1mA to 150mA Temperature C oeffi ci ent C urrent Li mi t(1) D ropout Voltage DVO/DT ILIM VD IO = 60mA IO = 10mA 180 7.5 20 35 40 200 130 150 180 IO = 100mA 165 195 225 IO = 150mA 200 245 275 Power Supply Rejecti on Rati o Output Noi se Voltage B YP Noi se Bypass Termi nal Voltage EN Enable Input Threshold Voltage VIH VIL Enable Input Bi as C urrent IEN Output ON Output OFF VEN = 1.8V, Output ON 6 1.8 0.5 10 µA V VBYP 1.250 V PSRR en VAC = 100mVRMS, f = 400Hz, IO = 30mA 10Hz £ f £ 80kHz, IO = 60mA 60 30 dB µVRMS 35 65 110 ppm/°C mA mV mV Sy mbol Test C onditions Min Ty p PRELIMINARY Unless specified: TA = 25°C, VIN = (VO(NOM) + 1V), CIN = 1µF, CBYP = 10nF, CO = 1µF. Values in bold apply over full operating temperature range. Max U nits Note: (1) As the load resistance further decreases, the SC112 folds back the output current to approximately 100mA at VO = 0V. ã 2001 Semtech Corp. 3 www.semtech.com SC112 POWER MANAGEMENT Pin Configuration Top View PRELIMINARY Ordering Information D ev ice (1)(2) P ackag e SOT-23-6 SC 112XXC SK.TR SOT-23-6 Notes: (1) Where XX denotes voltage options. Available voltages are: 2.2V (22), 2.5V (25), 2.8V (28), 3.0V (30), 3.3V (33), 3.6V (36), 3.8V (38), 4.0V (40) and 5.0V (50). Contact factory for additional voltage options. (2) Only available in tape and reel packaging. A reel contains 3000 devices. Block Diagram Pin Descriptions Pin 1 2 3 Pin Pin Function N ame EN GND BYP Acti ve hi gh enable pi n. C onnect to VIN i f not bei ng used. Ground pi n. Use for heatsi nki ng along wi th P i n #5. No i s e b yp a s s p i n. C o nne c t a 1 0 nF capaci tor (requi red) between thi s pi n and GND . Re g ula to r o utp ut, sup p lyi ng a g ua ra nte e d 150 mA. Ground pi n. Use for heatsi nki ng along wi th P i n #2. Power i nput pi n. 4 5 6 VO GND VIN ã 2001 Semtech Corp. 4 www.semtech.com SC112 POWER MANAGEMENT Outline Drawing - SOT23-6 PRELIMINARY Minimum Land Pattern -SOT23-6 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