SC1563 Very Low Dropout, Low Quiescent 500mA Regulator POWER MANAGEMENT Description Features The SC1563 is a high performance positive voltage regulator designed for use in applications requiring very low dropout voltage at up to 500mA. Since it has superior dropout characteristics compared to regular LDOs, it can be used to supply 2.5V on motherboards or 2.8V on peripheral cards from the 3.3V supply with no heatsink. Additionally, the SC1563 has a shutdown pin to further reduce power dissipation while shut down. The SC1563 provides excellent regulation over variations in line, load and temperature. A wide range of fixed output voltage options are avail- able. In addition, the output voltage of every device can be adjusted between 1.2V and 4.8V using external resistors. The SC1563 comes in the space saving 5-pin SOT23 package. 350mV dropout @ 500mA Designed to operate with ceramic capacitors Adjustable output from 1.2V to 4.8V Multiple output voltage options (all parts also adjustable externally using resistors) Over current and over temperature protection 2µA quiescent current in shutdown No minimum load current requirement Low reverse leakage (output to input) Full industrial temperature range 5-pin SOT-23 surface mount package. Also available in Lead-free, fully WEEE and RoHS compliant Applications Personal Digital Assistants Battery powered systems Motherboards Peripheral cards PCMCIA cards Typical Application Circuits Internally Preset Output Voltage U1 5 VIN 1 SHDN Externally Set Output Voltage SC1563IS-X.X IN OUT 4 VO (X.XV) SHDN GND ADJ C1 2 3 5 VIN 1 SHDN U1 SC1563IS-X.X IN OUT 4 VO R1 SHDN GND ADJ C2 C1 2 3 C2 R2 VOUT = Revision: January 11, 2006 1 1.200 (R1 + R2) Volts R2 www.semtech.com SC1563 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 VIN -0.3 to 7 V Shutdown Voltage VSHDN -0.3 to VIN V Power Dissipation PD Internally Limited W Thermal Resistance Junction to Ambient(1) θJA 175 °C/W Operating Ambient Temperature Range TA -40 to 85 °C Operating 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 V ESD 2 kV Input Voltage Note: (1) Minimum pad size. Electrical Characteristics Unless specified: VSHDN = 0V, Adjustable mode (VADJ > VTH(ADJ)): VIN = 2.2V to 5.5V and IOUT = 0A to 500mA, Fixed mode (VADJ = GND): VIN = (VOUT + 0.7V) to 5.5V and IOUT = 0A to 500mA. Values in bold apply over full operating temperature range. Parameter Symbol Conditions Min Typ Max Units 6.5 V IN Supply Voltage Range VIN Quiescent Current IQ 2.2 VIN = 3.3V 85 150 µA VIN = 6.5V, VSHDN = Open 0.01 2.00 µA VOUT +1% V OUT Output Voltage (1) VOUT VIN = VOUT + 0.7V, IOUT = 10mA (Internal Fixed Voltage) -1% -2% +2% Line Regulation(1) REG(LINE) VIN = (VOUT + 0.25V) to 5.5V, IOUT = 10mA 0.1 0.4 % Load Regulation(1) REG(LOAD) VIN = VOUT + 0.7V 0.15 0.40 % 2006 Semtech Corp. 2 www.semtech.com SC1563 POWER MANAGEMENT Electrical Characteristics Unless specified: VSHDN = 0V, Adjustable mode (VADJ > VTH(ADJ)): VIN = 2.2V to 5.5V and IOUT = 0A to 500mA, Fixed mode (VADJ = GND): VIN = (VOUT + 0.7V) to 5.5V and IOUT = 0A to 500mA. Values in bold apply over full operating temperature range. Parameter Symbol Conditions VD IOUT = 2mA Min Typ Max Units 1 5 mV OUT (Cont.) Dropout Voltage(1)(2) 10 IOUT = 100mA 70 100 mV 150 IOUT = 250mA 175 250 mV 350 IOUT = 500mA 350 500 mV 700 Current Limit 0.5 ILIM 1.0 A 1.212 V ADJ Reference Voltage(1) VREF VIN = 2.2V, VADJ = VOUT, IOUT = 10mA 1.188 1.200 1.176 Adjust Pin Current(3) Adjust Pin Threshold(4) IADJ VADJ = VREF VTH(ADJ) 0.10 1.224 65 150 nA 0.25 0.40 V 1.5 5.0 µA SH D N Shutdown Pin Current Shutdown Pin Threshold ISHDN VSHDN = 0V, VIN = 3.3V VIH VIN = 3.3V VIL VIN = 3.3V 1.8 V 0.4 Over Temperature Protection High Trip Level Hysteresis THI 170 °C THYST 10 °C Notes: (1) Low duty cycle pulse testing with Kelvin connections required. (2) Defined as the input to output differential at which the output voltage drops to 1% below the value measured at a differential of 0.7V for 2.5V ≤ VOUT ≤ 3.4V. Not measurable on outputs less than 2.2V due to minimum VIN constraints. See typical characteristics curves. (3) Guaranteed by design. (4) When VADJ exceeds this threshold, the “Sense Select” switch disconnects the internal feedback chain from the error amplifier and connects VADJ instead. 2006 Semtech Corp. 3 www.semtech.com SC1563 POWER MANAGEMENT Pin Configurations Ordering Information Part Number(1)(2)(3) Top View P ackag e SC1563ISK-X.XTR SC1563ISK-X.XTRT(4) SOT-23-5 Notes: (1) Where -X.X denotes voltage options. Available voltages are: 1.8V, 2.5V, 2.8V, 3.0V, 3.1V and 3.3V. (2) Output voltage can be adjusted using external resistors, see Pin Descriptions. (3) Only available in tape and reel packaging. A reel contains 3000 devices. (4) Lead free product. This product is fully WEEE and RoHS compliant. SOT-23-5 Marking Information SOT-23-5 63XX = SC1563, voltage option (example: 6318 for 1.8V option) yyww = Date code (example: 0008 for week 8 of 2000) 2006 Semtech Corp. 4 www.semtech.com SC1563 POWER MANAGEMENT Block Diagram Pin Descriptions Pin # Pin Name Pin Function 1 SHDN Shutdown Input. Leavi ng thi s pi n open turns the regulator off, reduci ng the qui escent current to a fraction of its operating value (typically < 300nA). The device will be enabled if this pin is pulled below 0.4V. Connect to GND if not being used. 2 GND Reference ground. This pin may be used for heatsinking purposes. 3 AD J Thi s pi n, when grounded, sets the output voltage to that set by the i nternal feedback resi stors. If external feedback resistors are used, the output voltage will be (See Application Circuit on page 1): VOUT = 4 OUT 5 IN 2006 Semtech Corp. 1.200 (R1 + R2) Volts R2 This pin is the power output of this device, sourcing up to 500mA. Input voltage. For regulation at full load, the input to this pin must be between (VOUT + 0.7V) and 6.5V. Minimum VIN = 2.2V. 5 www.semtech.com SC1563 POWER MANAGEMENT Applications Information Introduction Thermal Considerations The SC1563 is intended for applications such as graphics cards where high current capability and very low dropout voltage are required. It provides a very simple, low cost solution that uses little pcb real estate. Additional features include a shutdown pin to allow for a very low power consumption standby mode, and a fully adjustable output. The power dissipation in the SC1563 is approximately equal to the product of the output current and the input to output voltage differential: Component Selection PD( MAX ) = (VIN(MAX ) − VOUT (MIN ) )• IOUT (MAX ) + VIN(MAX ) • IQ(MAX ) PD ≈ (VIN − VOUT ) • IOUT The absolute worst-case dissipation is given by: Input capacitor - a 1µF ceramic capacitor is recommended. This allows for the device being some distance from any bulk capacitance on the rail. Additionally, input droop due to load transients is reduced, improving load transient response. Additional capacitance may be added if required by the application. For a typical scenario, VIN = 3.3V ± 5%, VOUT = 2.5V and IOUT = 500mA, therefore: VIN(MAX) = 3.465V, VOUT(MIN) = 2.450V and IQ(MAX) = 150µA, Output capacitor - a minimum bulk capacitance of 1µF, along with a 0.1µF ceramic decoupling capacitor is recommended. Increasing the bulk capacitance will improve the overall transient response. The use of multiple lower value ceramic capacitors in parallel to achieve the desired bulk capacitance will not cause stability issues. Although designed for use with ceramic output capacitors, the SC1563 is extremely tolerant of output capacitor ESR values and thus will also work comfortably with tantalum output capacitors. Thus PD(MAX) = 0.508W. Using this figure, and assuming TA(MAX) = 70°C, we can calculate the maximum thermal impedance allowable to maintain TJ ≤ 150°C: R TH( J− A )(MAX ) = (T J(MAX ) − TA (MAX ) ) PD(MAX ) = (150 − 70) = 157°C / W 0.508 This should be achievable with the SOT-23-5 package using pcb copper area to aid in conducting the heat away from the device. Internal ground/power planes and air flow will also assist in removing heat. Noise immunity - in very electrically noisy environments, it is recommended that 0.1µF ceramic capacitors be placed from IN to GND and OUT to GND as close to the device pins as possible. External voltage selection resistors - the use of 1% resistors, and designing for a current flow ≥ 10µA is recommended to ensure a well regulated output (thus R2 ≤ 120kΩ). 2006 Semtech Corp. 6 www.semtech.com SC1563 POWER MANAGEMENT Typical Characteristics Quiescent Current vs. Junction Temperature Quiescent Current vs. Input Voltage vs. Output Current vs. Output Current 150 10000 VIN = 3.3V, VADJ = VOUT VADJ = VOUT 125 IOUT = 500mA 75 1000 IOUT = 500mA IQ (µA) IQ (µA) 100 IOUT = 0mA 50 100 IOUT = 0mA 25 0 10 -50 -25 0 25 50 75 100 125 150 3.0 3.5 4.0 4.5 TJ (°C) 6.0 6.5 Line Regulation vs. Junction Temperature vs. Output Current vs. Input Voltage Change 0.40 VIN = VOUT(NOM) + 0.7V 0.4 VIN = (VOUT(NOM) + 0.25V) to 5.5V IOUT = 10mA 0.35 0.3 REGLINE (%VOUT(NOM)) VOUT Deviation (%V OUT(NOM)) 5.5 Output Voltage vs. Junction Temperature 0.5 0.2 0.1 IOUT = 0mA 0 -0.1 -0.2 IOUT = 500mA -0.3 0.30 0.25 0.20 0.15 0.10 0.05 -0.4 0.00 -0.5 -50 -25 0 25 50 75 100 125 -50 150 -25 0 25 0.20 0.18 50 75 100 125 150 TJ (°C) TJ (°C) Load Regulation vs. Dropout Voltage (IOUT = 0.5A) vs. Output Junction Temperature Voltage vs. Junction Temperature 700 VIN = VOUT(NOM) + 0.7V IOUT = 0mA to 500mA 600 0.16 TJ = 150°C 500 0.14 0.12 VD (mV) REGLOAD (%VOUT(NOM)) 5.0 VIN (V) 0.10 0.08 0.06 TJ = 25°C 400 300 200 TJ = -40°C 0.04 100 0.02 0.00 0 -50 -25 0 25 50 75 100 125 150 2.2 TJ (°C) 2006 Semtech Corp. 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 VOUT (V) 7 www.semtech.com SC1563 POWER MANAGEMENT Typical Characteristics (Cont.) Dropout Voltage (IOUT = 0.25A) vs. Output Dropout Voltage (IOUT = 0.1A) vs. Output Voltage vs. Junction Temperature Voltage vs. Junction Temperature 150 400 350 125 300 100 VD (mV) 250 VD (mV) TJ = 150°C TJ = 150°C TJ = 25°C 200 150 TJ = 25°C 75 50 100 TJ = -40°C TJ = -40°C 25 50 0 0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 2.2 4.6 2.4 2.6 2.8 3.0 3.2 4.2 4.4 Temperature vs. Output Current 4.6 VIN = 2.2V 1.204 900 1.203 850 1.202 800 1.201 VREF (V) ILIM (mA) 4.0 Junction Temperature 750 700 IOUT = 0mA 1.200 1.199 650 1.198 600 1.197 550 1.196 IOUT = 500mA 1.195 500 -50 -25 0 25 50 75 100 125 -50 150 -25 0 25 50 75 Reference Voltage (VIN = 5.5V) vs. Junction Adjust Pin Current vs. Temperature vs. Output Current Junction Temperature 1.210 1.208 100 125 150 100 125 150 TJ (°C) TJ (°C) 100 VIN = 5.5V 90 1.206 VIN = 6.5V VADJ = VREF 80 1.204 70 IOUT = 0mA 1.202 IADJ (nA) VREF (V) 3.8 Reference Voltage (VIN = 2.2V) vs. Junction VIN = VOUT(NOM) + 0.7V 950 3.6 Current Limit vs. 1.205 1000 3.4 VOUT (V) VOUT (V) 1.200 1.198 1.196 50 40 30 IOUT = 500mA 1.194 60 20 1.192 10 1.190 0 -50 -25 0 25 50 75 100 125 150 -50 TJ (°C) 2006 Semtech Corp. -25 0 25 50 75 TJ (°C) 8 www.semtech.com SC1563 POWER MANAGEMENT Typical Characteristics (Cont.) Adjust Pin Threshold Voltage Shutdown Pin Current vs. vs. Junction Temperature Junction Temperature 2.50 400 2.2V ≤ VIN ≤ 6.5V 375 350 2.00 325 1.75 300 ISHDN (µA) VTH(ADJ) (mV) VIN = 3.3V VSHDN = 0V 2.25 275 250 225 200 1.50 1.25 1.00 0.75 175 0.50 150 0.25 125 0.00 100 -50 -25 0 25 50 75 100 125 -50 150 -25 0 25 50 75 100 125 150 TJ (°C) TJ (°C) Shutdown Pin Threshold Voltage vs. Junction Temperature vs. Input Voltage 1.8 1.6 VIH, VIN = 6.5V VIH, VIL (V) 1.4 1.2 VIL, VIN = 6.5V 1.0 VIH, VIN = 2.2V 0.8 0.6 VIL, VIN = 2.2V 0.4 -50 -25 0 25 50 75 100 125 150 TJ (°C) 2006 Semtech Corp. 9 www.semtech.com SC1563 POWER MANAGEMENT Outline Drawing - SOT-23-5 A DIM e1 2X E/2 D A A1 A2 b c D E1 E e e1 L L1 N 01 aaa bbb ccc N EI 1 E 2 ccc 2X N/2 TIPS e B D aaa C A2 DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX .035 .000 .035 .010 .003 .110 .060 - .045 - .057 .006 .051 .020 .009 .118 .069 .114 .063 .110 BSC .037 BSC .075 BSC .012 .018 .024 (.024) 5 0° 10° .004 .008 .008 0.90 0.00 .90 0.25 0.08 2.80 1.50 - 1.15 - 1.45 0.15 1.30 0.50 0.22 3.00 1.75 2.90 1.60 2.80 BSC 0.95 BSC 1.90 BSC 0.30 0.45 0.60 (0.60) 5 0° 10° 0.10 0.20 0.20 A SEATING PLANE A1 C H bxN bbb C A-B D c GAGE PLANE 0.25 L 01 (L1) SEE DETAIL DETAIL A A SIDE VIEW NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. Land Pattern - SOT-23-5 X DIM (C) G Z Y P C G P X Y Z DIMENSIONS MILLIMETERS INCHES (.098) .055 .037 .024 .043 .141 (2.50) 1.40 0.95 0.60 1.10 3.60 NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. Contact Information Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 2006 Semtech Corp. 10 www.semtech.com