SC1118ST2.85TRT

SC1118 1A (Sink & Source) Low Dropout, Low Quiescent Current Voltage Regulator POWER MANAGEMENT Description Features The SC1118 family of low dropout regulators has the unique capability of maintaining output regulation while sourcing or sinking current. The 2.85V output voltage option is ideal for use as a Boulay termination of up to 27 SCSI data lines. The regulator maintains regulation while both sourcing and sinking current, enabling the use of active negation drivers for improved noise immunity on the data lines. Regulation of output voltage is maintained for TERMPWR voltages as low as 4.0V. When unloaded, quiescent supply current is a low 2mA, allowing continuous connection to the TERMPWR lines. ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ Regulates while sourcing or sinking current Provides termination for up to 27 SCSI lines 2mA quiescent current Ultra low power shutdown mode Current limit and thermal shutdown protection Stable for any CLOAD ≥ 0.22µF Fast settling time SOT-223 and SO-8 surface mount packages Applications ‹ ‹ ‹ ‹ ‹ An ultra low power shutdown mode is also available on the SO-8 version. In shutdown the output is high impedance and supply current drops to 100µA (typ.). Current limits in both sourcing and sinking modes, plus on-chip thermal shutdown make the circuit tolerant of output fault conditions. Active negation SCSI terminations Computers Disk drives CD-ROM drives Supply splitter The SC1118 is available in the 3-lead SOT-223 and 8-lead SO-8 packages. Typical Application Circuits U1 SC1118S-x.x 1, 4 VIN IN OUT 2 C1 1uF VOUT C2 1uF 8 EN GND NC U1 1, 4 5 OUT 1 VOUT C2 1uF GND 2 VOUT R1 GND FB 3, 6, 7 Revision: June 10, 2004 OUT SC1118S IN EN IN 2, TAB C1 1uF 8 U1 SC1118ST-x.x C1 1uF 3, 6, 7 VIN 3 VIN C2 1uF R1   VOUT = VFB •  1 +  + IFB • R1 R 2  5 R2 1 www.semtech.com SC1118 POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. Parameter Symbol Maximum Units Supply Voltage VIN 17 V Power Dissipation PD Internally Limited W Thermal Resistance Junction to Case SOT-223 SO-8 θJ C 16 39 °C/W Thermal Resistance Junction to Ambient SOT-223 SO-8 θJ A 57 163 °C/W Operating Temperature Range TA 0 to +85 °C Junction Temperature Range TJ -40 to +150 °C Storage Temperature Range TSTG -65 to +150 °C Lead Temperature (Soldering) 10 Sec. TLEAD 300 °C ESD Rating (Human Body Model) V ESD 2 kV Electrical Characteristics Unless otherwise specified: TA = 25°C, VIN = VEN = 5V (2.5V, 2.85V and adjustable options, adjustable option set to 2V out), VIN = VEN = 7V (5V option), IOUT = 0mA, CIN = COUT = 1µF. Values in bold apply over operating temperature range: 0 ≤ TJ = TA ≤ 85°C. Parameter Symbol Supply Voltage Range VIN Quiescent Current IQ Output Voltage(1) Feedback Bias Current Line Regulation(1)(5) Load Regulation(1)(5) ADJ, 2.5V, 2.85V 5V  2004 Semtech Corp. Max Units 15 V 2 5 mA V E N = 0V 100 250 µA VOUT +1% V -1% V FB -2% 0.99 -1A ≤ IOUT ≤ 1A, VIN = 3.7V to 15V IFB V O = V FB REG(LINE) REG(LOAD) Typ V E N = 5V -1A ≤ IOUT ≤ 1A, VIN = VIN(MIN)(2) to 15V Adjustable output option Min VIN(min)(2) VOUT Fixed output options Feedback Voltage(1)(5) Conditions +2% 1.00 0.98 1.01 V 1.02 25 µA ADJ, 2.5V, 2.85V: VIN = VIN(MIN)(2) to 15V 8 mV 5V: VIN = 6.5V to 15V 10 IOUT = -1A to 0A or 0A to 1A 10 20 2 16 mV www.semtech.com SC1118 POWER MANAGEMENT Electrical Characteristics Unless otherwise specified: TA = 25°C, VIN = VEN = 5V (2.5V, 2.85V and adjustable options, adjustable option set to 2V out), VIN = VEN = 7V (5V option), IOUT = 0mA, CIN = COUT = 1µF. Values in bold apply over operating temperature range: 0 ≤ TJ = TA ≤ 85°C. Parameter Dropout Voltage (1)(3) Symbol Conditions VD For Adjustable option VO = 3.3V, VEN = VIN Min Typ Max Units IOUT = 100mA 0.85 1.10 V IOUT = 800mA 1.0 1.3 IOUT = 1A 1.5 Minimum Output Voltage VOUT(MIN) ADJ version Maximum Output Voltage VOUT(MAX) ADJ version ICL(+) VOUT = (VOUT(NOM) - 100mV) 1 1.5 ICL(-) VOUT = (VOUT(NOM) + 100mV) -1 -1.5 Load Transient Settling Time, ∆VOUT = 1% tS IOUT = -1A to 0A or 0A to 1A 5 µs Ripple Rejection RA f = 120Hz, (VIN - VOUT) = 2V, VAC = 0.5VP-P 65 dB Enable Input Threshold VIH Output ON 1.5 V VIL Output OFF 1.5 0.4 IEN VEN = VIN = 7V (EN sinking) 25 60 VEN = 0V, VIN = 7V (EN sourcing) -25 -60 Output Current Limit(4) Enable Input Bias Current Thermal Shutdown Junction Temperature Thermal Shutdown Hysteresis V FB V 5.5 1.8 V A µA THI 155 °C THYST 15 °C Notes: (1) Low duty cycle pulse testing with Kelvin connections required. (2) VIN(MIN) for each voltage option is as follows: Voltage Option VIN(MIN) AD J 3.7V 2.5V 4.2V 2.85V 4.5V 5V 6.5V (3) Defined as the input to output differential at which the output voltage drops 1% below the value measured at a differential of 2V. (4) As VOUT increases further towards GND or VIN, the current limit will fold back. (5) Adjustable option: for 3.7V ≤ VIN ≤ 5V, VEN = VIN, for 5V ≤ VIN ≤ 15V, VEN = 5V  2004 Semtech Corp. 3 www.semtech.com SC1118 POWER MANAGEMENT Pin Configurations Ordering Information Top Views SOT-223 Adjustable Output Voltage Pin Function 1 OUT 2 GND 3 IN P ackag e SC1118S-X.XTR(2) SC1118STR(3) SO-8 SC1118ST-X.XTR(2) SOT-223 Notes: (1) Only available in tape and reel packaging. A reel contains 2500 devices (both packages). (2) Where X.X denotes voltage options. Available voltages are: 2.5V (-2.5), 2.85V (-2.85) and 5V (-5.0). Contact factory for additional voltage options. (3) Adjustable output voltage version (SO-8 only). SOT-223 Fixed Output Voltage Device(1) Block Diagram TAB is GND SO-8 * R1 and R2 are only in fixed voltage parts. FB pin is only present in adjustable part. Pin Descriptions Pin Name Pin Number Pin Function Fixed SO-8 Adj. SO-8 SOT-223 EN 8 8 - Active high enable input. CMOS/TTL compatible. Pulling this pin low shuts the device down. Connected internally to IN in the SOT-223 package. FB - 5 - Feedback input. Connects to the inverting input of the error amplifier. Use thi s p i n to a d jus t the o utp ut vo lta g e o f the a d jus ta b le S O-8 p a rts (s e e Application Circuit on page 1). GND 3, 6, 7 3, 6, 7 2/TAB IN 1, 4 1, 4 3 Input pin(s). Connect all pins to positive supply and to each other, decouple with 1µF minimum. NC 5 - - Not connected. Leave this pin floating. OUT 2 2 1 Output pin. Connect a ≥ 0.22µF capacitor for stability.  2004 Semtech Corp. Ground pin(s). Connect all ground connections to ground. 4 www.semtech.com SC1118 POWER MANAGEMENT Outline Drawing - SOT-223 Land Pattern - SOT-223  2004 Semtech Corp. 5 www.semtech.com SC1118 POWER MANAGEMENT Outline Drawing - SO-8 Land Pattern - SO-8 Contact Information Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804  2004 Semtech Corp. 6 www.semtech.com