SC1456

Dual 150mA Ultra Low Dropout, Low Noise Regulator POWER MANAGEMENT Description 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). SC1456 Features 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) Applications Battery Powered Systems Cellular Telephones Cordless Telephones Personal Digital Assistants Portable Instrumentation Modems PCMCIA cards 9 4 3 8 C3 1uF C4 1uF Typical Application Circuits VIN1 10 1 VIN2 (OR VIN1) C1 1uF C2 1uF 5 6 U1 IN1 EN1 IN2 EN2 GND 2 GND 7 SC1456 OUT1 OUT2 SET1 SET2 VOUT1 = PRESET VOUT2 = PRESET Output Voltages Set Internally U1 IN1 EN1 IN2 EN2 GND 2 GND 7 R2 SC1456 OUT1 OUT2 SET1 SET2 VIN1 10 1 9 4 3 8 R1 C3 2.2uF C4 1uF VOUT1 (SEE EQUATION) VOUT2 = PRESET VIN2 (OR VIN1) C1 1uF C2 1uF 5 6 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 VEN1, VEN2, VSET1, VSET2, VIN1, VIN2, VOUT1, VOUT2 to GND Thermal Resistance, Junction to Ambient Thermal Resistance, Junction to Case Operating Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 sec ESD Rating Symbol VPIN θJ A θJ C TA TJ TSTG TLEAD V ESD Maximum -0.3 to +7 120 45 -40 to +85 -40 to +125 -65 to +150 300 1.25 Units V °C/W °C/W °C °C °C °C 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 IN1, IN2 Supply Voltage Range Supply Current Symbol Test Conditions Min Typ Max Units VIN IQ IOUT = 0mA 2.5 90 6.0 130 160 V µA 50mA ≤ IOUT ≤ 150mA 110 160 200 µA V E N = 0V 0.0001 1 2 µA OUT1, OUT2 Output Voltage(2) VOUT IOUT = 1mA 1mA ≤ IOUT ≤ 150mA, VOUT + 1V ≤ VIN ≤ 5.5V Line Regulation(2) REG(LINE) 2.5V ≤ VIN ≤ 5.5V, VSET = VOUT, IOUT = 1mA -2.0% -3.5% 5 VOUT +2.0% +3.5% 10 12 Load Regulation(2) REG(LOAD) IOUT = 0mA to 50mA -10 -15 -20 IOUT = 0mA to 100mA -15 -20 -25 mV mV mV V  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 Load Regulation (Cont.)(2) Symbol REG(LOAD) Test Conditions IOUT = 0mA to 50mA, VSET = VOUT IOUT = 0mA to 100mA, VSET = VOUT Min Typ -2.5 Max -7.5 -15.0 Units mV -5 -15 -30 mV Dropout Voltage(2)(3) VD IOUT = 1mA IOUT = 50mA IOUT = 100mA 1.1 55 90 120 110 180 240 mV mV mV Current Limit Output Voltage Noise ILIM en PSRR 10Hz to 99kHz, IOUT = 50mA, COUT = 1µF 10Hz to 99kHz, IOUT = 50mA, COUT = 100µF f = 120Hz 150 240 90 75 55 350 mA µVRMS dB Power Supply Rejection Ratio E N 1, E N 2 EN Input Threshold VIH VIL 1.8 0.4 VEN = VIN 0 100 200 V EN Input Bias Current(4) IEN nA S E T 1, S E T 2 Sense/Select Threshold SET Reference Voltage(2) VTH V SET ISET IOUT = 1mA 1mA ≤ IOUT ≤ 150mA, 2.5V ≤ VIN ≤ 5.5V SET Input Leakage Current(4) Over Temperature Protection High Trip Level Hysteresis THI THYST 170 10 °C °C VSET = 1.3V 20 1.225 1.206 0.015 55 1.250 80 1.275 1.294 2.500 5.000 nA mV V 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 Top View Ordering Information Part Number SC1456XIMSTR(1)(2) SC1456XIMSTRT(1)(2)(3) P ackag e MSOP-10 MSOP-10 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. Voltage Options Replace X in the part number (SC1456XIMSTR) by the letter shown below for the corresponding voltage options: X A B C D VOUT1 (V) 2.5 2.8 3.0 3.3 VOUT2 (V) 2.5 2.8 3.0 3.3  2005 Semtech Corp. 4 www.semtech.com SC1456 POWER MANAGEMENT Block Diagram Pin Descriptions Pin 1 2 3 Pin Name EN1 GND SET 1 Pin Function Active high enable pin for device 1. Connect to VIN1 if not being used. Ground pin. Can be used for heatsinking if needed. Electrically connected to pin 7. 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 +  R2   4 5 6 7 8 OUT2 IN2 EN2 GND SET2 Regulator output for device 2, sourcing up to 150mA. Supply input pin for device 2. Active high enable pin for device 2. Connect to VIN2 if not being used. Ground pin. Can be used for heatsinking if needed. Electrically connected to pin 2. 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 10 OUT1 IN1 Regulator output for device 1, sourcing up to 150mA Supply input pin for device 1.  2005 Semtech Corp. 5 www.semtech.com SC1456 POWER MANAGEMENT Typical Characteristics Output Voltage (2.8V) vs. Output Current 2.86 2.85 2.84 2.83 2.82 VOUT (V) VOUT (V) 2.81 2.80 2.79 2.78 2.77 2.76 2.75 2.74 0 25 50 75 IOUT (mA) 100 125 150 VIN = 3.6V TJ = 25°C 2.86 2.85 2.84 2.83 2.82 2.81 2.80 2.79 2.78 2.77 2.76 2.75 2.74 -50 -25 0 25 50 75 100 125 TJ (°C) IO = 1mA IO = 50mA IO = 100mA IO = 150mA Output Voltage (2.8V) vs. Junction Temperature vs. Output Current VIN = 3.6V SET Reference Voltage vs. Output Current 1.275 1.270 1.265 1.260 VSET (V) VSET (V) 1.255 1.250 1.245 1.240 1.235 1.230 1.225 0 25 50 75 IOUT (mA) 100 125 150 VIN = 3.6V TJ = 25°C 1.290 1.280 1.270 1.260 1.250 1.240 1.230 1.220 1.210 SET Reference Voltage vs. Junction Temperature vs. Output Current VIN = 3.6V IO = 1mA IO = 50mA IO = 100mA IO = 150mA -50 -25 0 25 50 75 100 125 TJ (°C) Dropout Voltage vs. Output Current vs. Junction Temperature 250 225 200 175 VD (mV) 150 125 100 75 50 25 0 0 25 50 75 IOUT (mA) 100 125 150 0 -50 -25 -40°C 25°C 125°C Line Regulation vs. Junction Temperature 12 10 8 6 4 2 VIN = 2.5V to 5.5V SET = OUT IOUT = 1mA SET = GND REG(LINE) (mV) 0 25 TJ (°C) 50 75 100 125  2005 Semtech Corp. 6 www.semtech.com SC1456 POWER MANAGEMENT Typical Characteristics (Cont.) Load Regulation (VSET = GND) vs. Junction Temperature 50 45 40 REG(LOAD) (mV) 35 30 25 20 15 10 5 0 -50 -25 0 25 TJ (°C) 50 75 100 125 IOUT = 0mA to 50mA IOUT = 0mA to 100mA VIN = 3.6V SET = GND IOUT = 0mA to 150mA REG(LOAD) (mV) 20.0 17.5 15.0 12.5 10.0 7.5 5.0 2.5 0.0 -50 -25 0 25 TJ (°C) 50 75 100 125 IOUT = 0mA to 50mA IOUT = 0mA to 100mA Load Regulation (VSET = VOUT) vs. Junction Temperature VIN = 3.6V SET = OUT IOUT = 0mA to 150mA Supply Current vs. Output Current 120 110 100 90 80 IQ (µA) IQ (µA) 70 60 50 40 30 20 10 0 VIN = 3.6V TJ = 25°C 0 25 50 75 IOUT (mA) 100 125 150 25 0 -50 -25 100 75 50 125 150 Supply Current vs. Junction Temperature VIN = 3.6V IOUT = 150mA 0 25 TJ (°C) 50 75 100 125 Current Limit vs. Junction Temperature 350 300 250 VIH, VIL (V) ILIM (mA) 200 150 100 50 0 -50 -25 0 25 TJ (°C) 50 75 100 125 VIN = 3.6V 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 -50 Enable Input Threshold vs. Junction Temperature VIN = 3.6V VIH VIL -25 0 25 TJ (°C) 50 75 100 125  2005 Semtech Corp. 7 www.semtech.com SC1456 POWER MANAGEMENT Typical Characteristics (Cont.) Sense/Select Threshold vs. Junction Temperature 80 70 60 en (µV/√Hz) VTH (mV) 50 40 30 COUT = 100µF 20 -50 -25 0 25 TJ (°C) 50 75 100 125 0.01 0.1 1 f (kHz) 10 100 1 COUT = 1µF VIN = 3.6V 10 SC1456B VIN = 3.6V IOUT = 50mA TJ = 25°C Output Spectral Noise Density vs. Frequency 0.1 Applications Information Theory Of Operation 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. 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). 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. Component Selection - General Output capacitor: Semtech recommends a minimum capacitance of 1µF at each output with an equivalent  2005 Semtech Corp. 8 series resistance (ESR) of