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| 1A (Sink & Source) Low Dropout, Low Quiescent Current Voltage Regulator POWER MANAGEMENT Description 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. 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 100A (typ.). Current limits in both sourcing and sinking modes, plus on-chip thermal shutdown make the circuit tolerant of output fault conditions. The SC1118 is available in the 3-lead SOT-223 and 8-lead SO-8 packages. SC1118 Features 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 0.22F Fast settling time SOT-223 and SO-8 surface mount packages Applications Active negation SCSI terminations Computers Disk drives CD-ROM drives Supply splitter Typical Application Circuits U1 SC1118S-x.x VIN C1 1uF 8 5 1, 4 IN OUT 2 VOUT C2 1uF VIN C1 1uF 3 U1 SC1118ST-x.x IN OUT 1 VOUT C2 1uF EN GND NC 3, 6, 7 GND 2, TAB U1 VIN C1 1uF 8 1, 4 IN SC1118S OUT 2 R1 VOUT C2 1uF R1 VOUT = VFB * 1 + + IFB * R1 R2 EN GND FB 5 R2 3, 6, 7 www..com Revision: June 10, 2004 www..com www..com 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 Supply Voltage Power Dissipation Thermal Resistance Junction to Case SOT-223 SO-8 Thermal Resistance Junction to Ambient SOT-223 SO-8 Operating Temperature Range Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 Sec. ESD Rating (Human Body Model) Symbol VIN PD J C Maximum 17 Internally Limited 16 39 57 163 0 to +85 -40 to +150 -65 to +150 300 2 Units V W C/W J A TA TJ TSTG TLEAD V ESD C/W C C C C kV Electrical Characteristics Unless otherwise specified: TA = 25C, 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 = 1F. Values in bold apply over operating temperature range: 0 TJ = TA 85C. Parameter Supply Voltage Range Quiescent Current Symbol VIN IQ Conditions Min VIN(min)(2) Typ Max 15 Units V mA A V V E N = 5V V E N = 0V 2 100 -1% VOUT 5 250 +1% +2% Output Voltage(1) Fixed output options Feedback Voltage(1)(5) Adjustable output option Feedback Bias Current Line Regulation(1)(5) VOUT -1A IOUT 1A, VIN = VIN(MIN)(2) to 15V V FB -1A IOUT 1A, VIN = 3.7V to 15V IFB REG(LINE) V O = V FB ADJ, 2.5V, 2.85V: VIN = VIN(MIN)(2) to 15V 5V: VIN = 6.5V to 15V -2% 0.99 0.98 16 1.00 1.01 1.02 25 8 10 10 20 V A mV Load Regulation(1)(5) ADJ, 2.5V, 2.85V 5V REG(LOAD) IOUT = -1A to 0A or 0A to 1A mV 2004 Semtech Corp. 2 www.semtech.com SC1118 POWER MANAGEMENT Electrical Characteristics Unless otherwise specified: TA = 25C, 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 = 1F. Values in bold apply over operating temperature range: 0 TJ = TA 85C. Parameter Dropout Voltage (1)(3) For Adjustable option VO = 3.3V, VEN = VIN Minimum Output Voltage Maximum Output Voltage Output Current Limit(4) Symbol VD Conditions IOUT = 100mA IOUT = 800mA IOUT = 1A Min Typ 0.85 1.0 Max 1.10 1.3 1.5 Units V VOUT(MIN) VOUT(MAX) ICL(+) ICL(-) ADJ version ADJ version VOUT = (VOUT(NOM) - 100mV) VOUT = (VOUT(NOM) + 100mV) IOUT = -1A to 0A or 0A to 1A f = 120Hz, (VIN - VOUT) = 2V, VAC = 0.5VP-P Output ON Output OFF VEN = VIN = 7V (EN sinking) VEN = 0V, VIN = 7V (EN sourcing) 1.8 1 -1 V FB 5.5 1.5 -1.5 5 65 1.5 1.5 25 -25 155 15 0.4 60 -60 V V A Load Transient Settling Time, VOUT = 1% Ripple Rejection Enable Input Threshold tS RA VIH VIL s dB V Enable Input Bias Current IEN A Thermal Shutdown Junction Temperature Thermal Shutdown Hysteresis THI THYST C C Notes: (1) Low duty cycle pulse testing with Kelvin connections required. (2) VIN(MIN) for each voltage option is as follows: Voltage Option AD J 2.5V 2.85V 5V VIN(MIN) 3.7V 4.2V 4.5V 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 Top Views Ordering Information Device(1) SC1118S-X.XTR(2) SC1118STR(3) SC1118ST-X.XTR(2) P ackag e SO-8 SOT-223 Fixed Output Voltage SOT-223 SOT-223 Pin 1 2 Function OUT GND IN 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). Block Diagram Adjustable Output Voltage SO-8 3 TAB is GND Pin Descriptions Pin Name EN FB Pin Number Fixed SO-8 8 Adj. SO-8 8 5 SOT-223 - * R1 and R2 are only in fixed voltage parts. FB pin is only present in adjustable part. Pin Function Active high enable input. CMOS/TTL compatible. Pulling this pin low shuts the device down. Connected internally to IN in the SOT-223 package. 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). Ground pin(s). Connect all ground connections to ground. Input pin(s). Connect all pins to positive supply and to each other, decouple with 1F minimum. Not connected. Leave this pin floating. Output pin. Connect a 0.22F capacitor for stability. 4 www.semtech.com GND IN NC OUT 3, 6, 7 1, 4 5 2 3, 6, 7 1, 4 2 2/TAB 3 1 2004 Semtech Corp. 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 |
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