SC112 150mA Ultra Low Dropout Micropower Linear Regulator POWER MANAGEMENT Description PRELIMINARY Features 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 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. The output noise is reduced to 30µV (typical) by placing a very low leakage 10nF capacitor on pin 3 (noise bypass). Low dropout 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 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 Each device contains a bandgap reference, error amplifier, PNP pass element, thermal and current limiting circuitry and resistor divider network for setting output voltage. Battery powered systems Cellular telephones Cordless telephones Pagers Personal digital assistants Portable instrumentation Low voltage systems 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 GND GND BYP VO 6 VIN 5 4 C1 10nF VO C2 1uF C3 1uF Notes: (1) CIN (C3) is needed if the device is far from the supplys 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 PRELIMINARY Sy mbol Maximum U nits Input Supply Voltage VIN -0.3 to +16 V Enable Input Voltage V EN -0.3 to VIN V Power D i ssi pati on PD Internally Li mi ted W Thermal Resi stance Juncti on to Ambi ent q JA 230 °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: TA = 25°C, VIN = (VO(NOM) + 1V), CIN = 1µF, CBYP = 10nF, CO = 1µF. Values in bold apply over full operating temperature range. Parameter Sy mbol Test C onditions Min Ty p Max U nits 14.5 V 75 µA VIN Supply Voltage Range VIN Ground Pi n C urrent IGND 2.5 IO = 0mA 60 90 IO = 60mA 1.00 1.25 mA 1.50 IO = 100mA 2.1 2.5 3.0 IO = 150mA 4.20 4.75 5.25 VIN = 8V, Output OFF 0.1 µA +2.5 % VO Output Voltage VO IO = 30mA -2.5 VO -3.0 Li ne Regulati on REG(LINE) VIN = (VO(NOM) + 1V) to (VO(NOM) + 6V), IO = 1mA ã 2001 Semtech Corp. 2 +3.0 5 10 mV 20 www.semtech.com SC112 POWER MANAGEMENT Electrical Characteristics (Cont.) 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. Parameter Sy mbol Test C onditions REG(LOAD) Min Ty p Max U nits IO = 1mA to 60mA 7.5 35 mV IO = 1mA to 100mA 20 65 IO = 1mA to 150mA 35 110 IO = 10mA 40 ppm/°C 200 mA VO (C ont.) Load Regulati on Temperature C oeffi ci ent DVO/DT C urrent Li mi t(1) ILIM D ropout Voltage VD 180 IO = 60mA 130 150 mV 180 IO = 100mA 165 195 225 IO = 150mA 200 245 275 Power Supply Rejecti on Rati o Output Noi se Voltage PSRR VAC = 100mVRMS, f = 400Hz, IO = 30mA 60 dB en 10Hz £ f £ 80kHz, IO = 60mA 30 µVRMS 1.250 V B YP Noi se Bypass Termi nal Voltage VBYP EN Enable Input Threshold Voltage Enable Input Bi as C urrent VIH Output ON VIL Output OFF IEN VEN = 1.8V, Output ON 1.8 V 0.5 6 10 µA 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 PRELIMINARY Ordering Information D ev ice Top View (1)(2) 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. SOT-23-6 Block Diagram Pin Descriptions Pin ã 2001 Semtech Corp. P ackag e 4 Pin Pin Function N ame 1 EN Acti ve hi gh enable pi n. C onnect to VIN i f not bei ng used. 2 GND Ground pi n. Use for heatsi nki ng along wi th P i n #5. 3 BYP 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 . 4 VO Re g ula to r o utp ut, sup p lyi ng a g ua ra nte e d 150 mA. 5 GND Ground pi n. Use for heatsi nki ng along wi th P i n #2. 6 VIN Power i nput pi n. 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