SC1456 Dual 150mA Ultra Low Dropout, Low Noise Regulator POWER MANAGEMENT Description Features The SC1456 contains two low dropout linear regulators that operate from a +2.5V to +6V input range and deliver up to 150mA. PMOS pass transistors allow a low 110µA supply current per device to remain independent of load, making these devices ideal for battery operated portable equipment such as cellular phones, cordless phones and personal digital assistants. Each device can be powered from a separate supply voltage or the same supply voltage for maximum flexibility. The output voltage of each device can be preset or adjusted with an external resistor divider. Other features include independant low powered shutdown, short circuit protection, thermal shutdown protection and reverse battery protection for each regulator. The SC1456 comes in the tiny 10 lead MSOP package (lead free, fully WEEE and RoHS compliant available). Applications Typical Application Circuits 10 VIN1 U1 1 5 VIN2 (OR VIN1) 6 C1 1uF SC1456 IN1 OUT1 EN1 OUT2 IN2 SET1 EN2 SET2 C2 1uF GND Two guaranteed 150 mA outputs Designed to operate with ceramic capacitors Fixed or adjustable outputs Very small external components Low 75µVRMS output noise Very low supply currents Thermal overload protection Reverse battery protection Individual low power shutdown Full industrial temperature range Surface mount packaging (10 pin MSOP) Battery Powered Systems Cellular Telephones Cordless Telephones Personal Digital Assistants Portable Instrumentation Modems PCMCIA cards 9 VOUT1 = PRESET 4 VOUT2 = PRESET 3 8 C3 1uF GND 2 C4 1uF 7 Output Voltages Set Internally 10 VIN1 1 5 VIN2 (OR VIN1) 6 C1 1uF C2 1uF U1 SC1456 IN1 OUT1 EN1 OUT2 IN2 SET1 EN2 SET2 GND 2 9 VOUT1 (SEE EQUATION) 4 3 8 VOUT2 = PRESET R1 C3 2.2uF GND 7 R2 C4 1uF R1 VOUT1 = 1.250 • 1 + R2 R 2 ≤ 120k Ω Output 1 Set Externally and Output 2 Set Internally Revision: November 16, 2005 1 www.semtech.com SC1456 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 VEN1, VEN2, VSET1, VSET2, VIN1, VIN2, VOUT1, VOUT2 to GND VPIN -0.3 to +7 V Thermal Resistance, Junction to Ambient θJ A 120 °C/W Thermal Resistance, Junction to Case θJ C 45 °C/W Operating Ambient Temperature Range TA -40 to +85 °C Operating Junction Temperature Range TJ -40 to +125 °C Storage Temperature Range TSTG -65 to +150 °C Lead Temperature (Soldering) 10 sec TLEAD 300 °C ESD Rating V ESD 1.25 kV Electrical Characteristics(1) Unless specified: VINx = 3.6V, VSETx = GND, VENx = 3.6V, TA = 25°C. Values in bold apply over full operating ambient temperature range. Parameter Symbol Test Conditions Min Typ Max Units 6.0 V 130 µA IN1, IN2 Supply Voltage Range VIN Supply Current IQ 2.5 IOUT = 0mA 90 160 50mA ≤ IOUT ≤ 150mA 110 160 µA 200 V E N = 0V 0.0001 1 µA 2 OUT1, OUT2 Output Voltage(2) Line Regulation(2) VOUT REG(LINE) IOUT = 1mA -2.0% 1mA ≤ IOUT ≤ 150mA, VOUT + 1V ≤ VIN ≤ 5.5V -3.5% 2.5V ≤ VIN ≤ 5.5V, VSET = VOUT, IOUT = 1mA VOUT +2.0% V +3.5% 5 10 mV 12 Load Regulation(2) REG(LOAD) IOUT = 0mA to 50mA -10 -15 mV -20 IOUT = 0mA to 100mA -15 -20 mV -25 2005 Semtech Corp. 2 www.semtech.com SC1456 POWER MANAGEMENT Electrical Characteristics (Cont.)(1) Unless specified: VINx = 3.6V, VSETx = GND, VENx = 3.6V, TA = 25°C. Values in bold apply over full operating ambient temperature range. Parameter Symbol Test Conditions Load Regulation (Cont.)(2) REG(LOAD) IOUT = 0mA to 50mA, VSET = VOUT Min Typ Max Units -2.5 -7.5 mV -15.0 IOUT = 0mA to 100mA, VSET = VOUT -5 -15 mV -30 VD Dropout Voltage(2)(3) IOUT = 1mA 1.1 IOUT = 50mA 55 mV 90 mV 120 IOUT = 100mA 110 180 mV 240 Current Limit ILIM Output Voltage Noise en Power Supply Rejection Ratio PSRR 150 240 10Hz to 99kHz, IOUT = 50mA, COUT = 1µF 90 10Hz to 99kHz, IOUT = 50mA, COUT = 100µF 75 f = 120Hz 55 350 mA µVRMS dB E N 1, E N 2 EN Input Threshold 1.8 VIH V 0.4 VIL EN Input Bias Current(4) IEN VEN = VIN 0 100 nA 200 S E T 1, S E T 2 Sense/Select Threshold VTH SET Reference Voltage(2) V SET SET Input Leakage ISET 20 55 80 mV IOUT = 1mA 1.225 1.250 1.275 V 1mA ≤ IOUT ≤ 150mA, 2.5V ≤ VIN ≤ 5.5V 1.206 VSET = 1.3V 1.294 0.015 2.500 nA 5.000 Current(4) Over Temperature Protection High Trip Level Hysteresis THI 170 °C THYST 10 °C Notes: (1) This device is ESD sensitive. Use of standard ESD handling precautions is required. (2) Low duty cycle pulse testing with Kelvin connections required. (3) Defined as the input to output differential at which the output voltage drops 100mV below the value measured at a differential of 2V. (4) Guaranteed by design. 2005 Semtech Corp. 3 www.semtech.com SC1456 POWER MANAGEMENT Pin Configuration Ordering Information Top View Part Number P ackag e SC1456XIMSTR(1)(2) MSOP-10 SC1456XIMSTRT(1)(2)(3) MSOP-10 Notes: (1) Where X denotes voltage options - see table below. Consult factory for other voltage options. (2) Only available in tape and reel packaging. A reel contains 2500 devices. (3) Lead free product. Fully WEEE and RoHS compliant. MSOP-10 Voltage Options Replace X in the part number (SC1456XIMSTR) by the letter shown below for the corresponding voltage options: 2005 Semtech Corp. 4 X VOUT1 (V) VOUT2 (V) A 2.5 2.5 B 2.8 2.8 C 3.0 3.0 D 3.3 3.3 www.semtech.com SC1456 POWER MANAGEMENT Block Diagram Pin Descriptions Pin Pin Name Pin Function 1 EN1 Active high enable pin for device 1. Connect to VIN1 if not being used. 2 GND Ground pin. Can be used for heatsinking if needed. Electrically connected to pin 7. 3 SET 1 Connecting this pin to ground results in the internally preset value for VOUT1. Connecting to an external resistor divider changes VOUT1 to: R1 VOUT 1 = 1 .250 • 1 + R 2 4 OUT2 Regulator output for device 2, sourcing up to 150mA. 5 IN2 Supply input pin for device 2. 6 EN2 Active high enable pin for device 2. Connect to VIN2 if not being used. 7 GND Ground pin. Can be used for heatsinking if needed. Electrically connected to pin 2. 8 SET2 Connecting this pin to ground results in the internally preset value for VOUT2. Connecting to an external resistor divider changes VOUT2 to: R1 VOUT 2 = 1 .250 • 1 + R2 9 OUT1 10 IN1 2005 Semtech Corp. Regulator output for device 1, sourcing up to 150mA Supply input pin for device 1. 5 www.semtech.com SC1456 POWER MANAGEMENT Typical Characteristics 2.86 Output Voltage (2.8V) vs. Junction Temperature Output Current vs. Output Current 2.86 VIN = 3.6V TJ = 25°C 2.85 2.84 VIN = 3.6V 2.85 2.84 2.83 2.83 2.82 2.82 2.81 2.81 VOUT (V) VOUT (V) Output Voltage (2.8V) vs. 2.80 2.79 IO = 150mA 2.79 2.78 2.78 2.77 2.77 2.76 2.76 2.75 2.75 2.74 IO = 1mA IO = 50mA IO = 100mA 2.80 2.74 0 25 50 75 100 125 150 -50 -25 0 25 IOUT (mA) 1.275 Temperature vs. Output Current 1.290 1.270 1.260 1.255 VSET (V) VSET (V) VIN = 3.6V 1.280 1.250 1.245 IO = 1mA IO = 50mA IO = 100mA IO = 150mA 1.250 1.240 1.240 1.230 1.235 1.220 1.230 1.225 1.210 0 25 50 75 100 125 150 -50 -25 0 IOUT (mA) 25 50 75 100 125 TJ (°C) Dropout Voltage vs. Output Current Line Regulation vs. vs. Junction Temperature Junction Temperature 12 SET = GND 10 200 REG(LINE) (mV) 175 VD (mV) 125 Output Current 1.260 225 100 SET Reference Voltage vs. Junction 1.265 250 75 SET Reference Voltage vs. VIN = 3.6V TJ = 25°C 1.270 50 TJ (°C) 150 -40°C 25°C 125°C 125 100 75 50 VIN = 2.5V to 5.5V SET = OUT IOUT = 1mA 8 6 4 2 25 0 0 0 25 50 75 100 125 -50 150 2005 Semtech Corp. -25 0 25 50 75 100 125 TJ (°C) IOUT (mA) 6 www.semtech.com SC1456 POWER MANAGEMENT Typical Characteristics (Cont.) 50 Load Regulation (VSET = GND) Load Regulation (VSET = VOUT) vs. Junction Temperature vs. Junction Temperature 20.0 VIN = 3.6V SET = GND 45 40 IOUT = 0mA to 150mA IOUT = 0mA to 150mA 35 15.0 REG(LOAD) (mV) REG(LOAD) (mV) VIN = 3.6V SET = OUT 17.5 30 25 20 IOUT = 0mA to 100mA 15 12.5 10.0 7.5 IOUT = 0mA to 100mA 5.0 10 2.5 IOUT = 0mA to 50mA 5 IOUT = 0mA to 50mA 0.0 0 -50 -25 0 25 50 75 100 -50 125 -25 0 25 TJ (°C) 50 75 100 125 75 100 125 TJ (°C) Supply Current vs. Supply Current vs. Output Current Junction Temperature 150 120 110 125 100 VIN = 3.6V IOUT = 150mA 90 100 70 IQ (µA) IQ (µA) 80 60 50 75 50 40 30 20 10 0 25 VIN = 3.6V TJ = 25°C 0 0 25 50 75 100 125 -50 150 -25 0 25 350 Current Limit vs. Enable Input Threshold vs. Junction Temperature Junction Temperature 2.0 VIN = 3.6V VIN = 3.6V 1.8 300 1.6 VIH, VIL (V) 250 ILIM (mA) 50 TJ (°C) IOUT (mA) 200 150 100 1.4 VIH 1.2 1.0 VIL 0.8 50 0.6 0 0.4 -50 -25 0 25 50 75 100 -50 125 2005 Semtech Corp. -25 0 25 50 75 100 125 TJ (°C) TJ (°C) 7 www.semtech.com SC1456 POWER MANAGEMENT Typical Characteristics (Cont.) 80 Sense/Select Threshold vs. Output Spectral Noise Density Junction Temperature vs. Frequency 10 VIN = 3.6V SC1456B VIN = 3.6V IOUT = 50mA TJ = 25°C 70 1 en (µV/√Hz) VTH (mV) 60 50 40 COUT = 1µF 0.1 30 COUT = 100µF 20 0.01 -50 -25 0 25 50 75 100 125 0.1 TJ (°C) 1 10 100 f (kHz) Applications Information Theory Of Operation series resistance (ESR) of <1Ω over temperature. Ceramic capacitors are ideal for this application. Increasing the bulk capacitance will further reduce output noise and improve the overall transient response. The SC1456 is intended for applications where very low dropout voltage, low supply current, low output noise and pcb real estate are critical. It provides a very simple, low cost solution for two seperate regulated outputs. Internally preset output voltage options require the use of only four external capacitors for operation. Input capacitor: Semtech recommends the use of a 1µF ceramic capacitor at each input. 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. Each regulator has both fixed and adjustable output voltage modes. Grounding the SET pin (pulling it below the Sense/Select threshold of 55mV) will connect the internal resistor divider of that regulator to the error amplifier resulting with the internally preset output voltage. If SET is pulled above this threshold, then the Sense/Select switch will connect the SET pin to the error amplifier. The output will be regulated such that the voltage at SET will equal VSET, the SET reference voltage (typically 1.250V). Component Selection - Externally Set Output Please refer to Figure 1 on page 9. The output voltage of both outputs (OUT1 shown here) can be externally adjusted anywhere within the range from 1.25V to (VIN(MIN) - VD(MAX)). The output voltage will be in accordance with the following equation: R1 VOUT = 1.250 • 1 + R2 An active high enable pin (EN) is provided for each output to allow the customer to shut down that regulator and enter an extremely low power Off-state. A logic Low signal will reduce the regulator’s supply current to 0.1nA. 1% tolerance resistors are recommended. The values of R1 and R2 should be selected such that the current flow through them is ≥ 10µA (thus R2 ≤ 120kΩ). At high input voltages and/or high output currents, stability may be improved by increasing C2 to 2.2µF and reducing R2 to 10kΩ. See “Component Selection - General” for input capacitor requirements. Component Selection - General Output capacitor: Semtech recommends a minimum capacitance of 1µF at each output with an equivalent 2005 Semtech Corp. 8 www.semtech.com SC1456 POWER MANAGEMENT Applications Information (Cont.) 10 VIN1 1 5 VIN2 (OR VIN1) 6 C1 1uF U1 SC1456 IN1 OUT1 EN1 OUT2 IN2 SET1 EN2 SET2 C2 1uF GND 2 9 VOUT1 (SEE EQUATION) 4 3 8 VOUT2 = PRESET R1 C3 2.2uF GND C4 1uF 7 R2 Figure 1: Output 1 Set Externally and Output 2 Set Internally Thermal Considerations With the standard MSOP-10 Land Pattern shown at the end of this datasheet, and minimum trace widths, the thermal impedance junction to ambient for SC1456 is 113°C/W. Thus with no additional heatsinking, TJ(MAX) = 119°C. The worst-case power dissipation for this part is given by: PD(MAX ) = (VIN1(MAX ) − VOUT1(MIN) ) • IOUT1(MAX ) + VIN1(MAX ) • IQ1(MAX ) The junction temperature can be reduced further by the use of larger trace widths, and connecting pcb copper area to the GND pins (pins 2 and 7), which connect directly to the device substrate. Lower junction temperatures improve overall output voltage accuracy. + (VIN2(MAX ) − VOUT 2(MIN) ) • IOUT 2(MAX ) + VIN2(MAX ) • IQ 2(MAX ) For all practical purposes, it can be reduced to: Layout Considerations PD(MAX ) = (VIN1(MAX ) − VOUT1(MIN) ) • IOUT1(MAX ) While layout for linear devices is generally not as critical as for a switching application, careful attention to detail will ensure reliable operation. + (VIN2( MAX ) − VOUT 2(MIN) ) • IOUT 2(MAX ) Looking at a typical application: 1) Attaching the part to a larger copper footprint will enable better heat transfer from the device, especially on PCBs where there are internal ground and power planes. VIN1(MAX) = VIN2(MAX) = 4.2V VOUT1(MIN) = VOUT2(MIN) = (2.8V - 3.5%) = 2.702V worst-case IOUT1 = IOUT2 = 100mA TA = 85°C 2) Place the input and output capacitors close to the device for optimal transient response and device behavior. This gives us: PD(MAX) = 2 • (4.2 − 2.702) • 0.100 = 300mW 3) Connect all ground connections directly to the ground plane. If there is no ground plane, connect to a common local ground point before connecting to board ground. Using this figure, we can calculate the maximum thermal impedance allowable to maintain TJ ≤ 125°C: θ( J− A )(MAX ) = (T J( MAX ) − TA (MAX ) ) PD(MAX ) 2005 Semtech Corp. = (125 − 85 ) = 133°C / W 0.300 9 www.semtech.com SC1456 POWER MANAGEMENT Outline Drawing - MSOP-10 e A DIM D A A1 A2 b c D E1 E e L L1 N 01 aaa bbb ccc N 2X E/2 ccc C 2X N/2 TIPS E E1 PIN 1 INDICATOR 12 B DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX .043 .000 .006 .030 .037 .007 .011 .003 .009 .114 .118 .122 .114 .118 .122 .193 BSC .020 BSC .016 .024 .032 (.037) 10 8° 0° .004 .003 .010 1.10 0.00 0.15 0.95 0.75 0.17 0.27 0.08 0.23 2.90 3.00 3.10 2.90 3.00 3.10 4.90 BSC 0.50 BSC 0.40 0.60 0.80 (.95) 10 0° 8° 0.10 0.08 0.25 D aaa C SEATING PLANE A2 H A bxN bbb c GAGE PLANE A1 C C A-B D 0.25 L (L1) DETAIL SEE DETAIL SIDE VIEW 01 A A 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. 4. REFERENCE JEDEC STD MO-187, VARIATION BA. Land Pattern - MSOP-10 X DIM (C) G C G P X Y Z Z Y DIMENSIONS INCHES MILLIMETERS (.161) .098 .020 .011 .063 .224 (4.10) 2.50 0.50 0.30 1.60 5.70 P 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 2005 Semtech Corp. 10 www.semtech.com