SC620ULTRT

SC620 Octal LED Driver, General Purpose Current Sink with Serial Interface POWER MANAGEMENT Features Wide current setting range — 31.25μA to 25mA Eight identical current drivers with independent control 5% current matching, 7% accuracy I2C interface for microprocessor control I2C slave address 1110 000x Less than 1μA quiescent current in shutdown Low dropout voltage — ≤ 150mV Over-temperature protection MLPQ-UT-16 package (3mm x 3mm) Ultra-thin 0.6mm maximum package height Fully WEEE and RoHS compliant Description The SC620 is a multi-purpose LED driver with eight identical, independently controlled current sinks. Each current sink can drive an LED by connecting the LED’s anode to the system power supply and the cathode to the current sink input pin. Any combination of outputs can be enabled or disabled for optimal design flexibility. The SC620 also employs an adjustable global current gain setting register to allow the current setting step size to vary from 31.25μA to 500μA. This provides a wide range of options for LED variation and dimming functions. The maximum output is also scaled by this step size, with a maximum of 25mA at the highest step setting. Multi-colored and white LEDs with different forward voltages can be driven using the same SC620 due to its floating cathode technology. This feature allows each output pin to vary in voltage from 150mV to VIN - 1.5V. All current control is programmed using an I2C interface bus. Only a single input bypass capacitor is required — no other external resistors or capacitors are needed. The 3mm x 3mm MLPQ package and minimal support components make the SC620 an ideal solution for low-cost, area-conscious backlighting designs. Applications LCD backlighting LED driver Multicolor and RGB LED driver General purpose current sink array General purpose digital output (open-drain) expander Auto-focus voice-coil driver Typical Application Circuit LED Backlighting Battery Main Panel Sub Panel Color/R/G/B LEDs 1μF IN SCL SDA EN SCL SDA EN GND GND GND GND SC620 ILED1 ILED2 ILED3 ILED4 ILED5 ILED6 ILED7 ILED8 December 19, 2007 © 2007 Semtech Corporation 1 SC620 Pin Configuration Ordering Information Device ILED8 ILED7 ILED6 ILED5 Package MLPQ-UT-16 3×3(2) Evaluation Board SC620ULTRT(1)(2) SC620EVB 12 11 10 GND SCL SDA GND 16 GND IN EN GND 1 2 3 4 5 15 14 13 TOP VIEW Notes: (1) Available in tape and reel only. A reel contains 3,000 devices. (2) Lead-free package only. Device is WEEE and RoHS compliant. T 6 7 8 9 ILED1 ILED2 ILED3 MLPQ-UT-16; 3x3, 16 LEAD θJA = 39°C/W Marking Information 620 yyww xxxx yy = two digit year of manufacture ww = two digit week of manufacture xxxx = lot number ILED4 2 SC620 Absolute Maximum Ratings IN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0 Pin Voltage — All Other Pins (V) . . . . . . . . . -0.3 to VIN + 0.3 ESD Protection Level(1) (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Recommended Operating Conditions Ambient Temperature Range (°C) . . . . . . . . . . . . -40 to +85 Thermal Information Thermal Resistance, Junction to Ambient(2) (°C/W) . . . . 39 Operating Junction Temperature (°C) . . . . . . . . -40 to +150 Storage Temperature Range (°C) . . . . . . . . . . . -65 to +150 Peak IR Reflow Temperature (10s to 30s) (°C) . . . . . . . +260 Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not recommended. NOTES: (1) Tested according to JEDEC standard JESD22-A114-B. (2) Calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards. Electrical Characteristics Unless otherwise noted, TA = +25°C for Typ, -40ºC to 85°C for Min and Max, VIN = 2.7V to 5.5V, CIN = 1μF, ΔVF ≤ 1.5V Parameter Maximum LED Current Setting(1) LED Current Setting Accuracy(1) Symbol ILEDn ΔILEDn ΔILEDn/ ΔVF ILED-to-LED VDO ISHDN Condition Min Typ 25 Max Units mA ILEDn = 15mA, VF = 3.4V, VILEDn = 2V, TA = 25ºC 5mA < ILEDn ≤ 25mA, TA = 25ºC ILEDn = 15mA, TA = 25ºC ILEDn = 25mA EN = GND Normal Mode(3) -7 +7 % Load Regulation LED Current Matching Accuracy(1) Dropout Voltage Shutdown Current -2 -5 2 +5 150 0.1 500 31.25 60 720 4.5 1 %/V % mV μA μA μA μA μA mA Current Step Size ISTEP Low-Current Mode(4) Standby: EN = VIN, LED1-8 disabled(2) Quiescent Current IQ EN = VIN, ILED1-8 = 1.968mA(4) EN = VIN, ILED1-8 = 25mA(3) 3 SC620 Electrical Characteristics (continued) Parameter Current Sink Turn-on Time Current Sink Turn-off Time EN Input High Threshold EN Input Low Threshold EN Input High Current Over Temperature Protection(5) Symbol tON tOFF VIH VIL IIH TOTP Condition from 0 to 95% of target from 90% to 10% of set value VIN = 5.5V VIN = 2.7V VIN = 5.5V Min Typ Max 1 Units ms μs V 1 1.6 0.4 2 155 V μA °C I2C Interface(5) Interface complies with slave mode I2C interface as described by Philips I2C specification version 2.1 dated January, 2000. VB-IL 0.4 1.6 IDIN (SDA) ≤ 3mA IB-IN VHYS tSP CIN -0.2 0.1 50 10 0.4 0.2 V V V μA V ns pF Digital Input Voltage VB-IH SDA Output Low Level Digital Input Current Schmitt Trigger Input Hysteresis Maximum Glitch Pulse Rejection I/O Pin Capacitance I2C Timing Clock Frequency SCL Low Period SCL High Period Data Hold Time Data Setup Time Setup Time for Repeated START Condition Hold Time for Repeated START Condition Setup Time for STOP Condition fSCL tLOW tHIGH tHD_DAT tSU_DAT tSU_STA tHD_STA tSU_STO 1.3 0.6 0 100 0.6 0.6 0.6 400 440 kHz μs μs μs μs μs μs μs 4 SC620 Electrical Characteristics (continued) Parameter I2C Timing (continued) Bus-Free Time Between STOP and START Interface Start-up Time tBUF tEN Bus Start-up Time After EN Pin is Pulled High 1.3 350 μs μs Symbol Condition Min Typ Max Units Notes: (1) Current step size = 500μA - See Table 1 for other step size options. (2) Outputs are disabled but I2C bus is active (3) Current gain register set to maximum value - see Control Register section for details. (4) Current gain register set to minimum value - see Control Register section for details. (5) Guaranteed by design. 5 SC620 Typical Characteristics Low Current Settings with Anode = VIN 600 Anode supply = VIN 500μA,VF = 2.80V 500 Low Current Settings with Anode = 5V 600 Anode supply = 5V 500μA,VF = 2.79V 500 Boundary of cathode at VIN-1.5V Boundary of cathode = 150mV LED Current (μA) LED Current (μA) 400 400 300 250μA,VF = 2.73V 300 250μA,VF = 2.73V 200 125μA,VF = 2.68V 100 31.25μA,VF = 2.59V 0 2.5 3 3.5 4 VIN (V) 4.5 5 5.5 200 125μA,VF = 2.68V 100 31.25μA,VF = 2.59V 0 3.5 3.75 4 4.25 4.5 VIN (V) 4.75 5 5.25 5.5 Mid Current Settings with Anode = VIN 16 Anode supply = VIN 15mA,VF = 3.27V 14 14 16 Mid Current Settings with Anode = 5V Anode supply = 5V 15mA,VF = 3.26V LED Current (mA) 10 10mA,VF = 3.20V LED Current (mA) 12 12 10mA,VF = 3.19V 10 8 Boundary at cathode = 150mV 8 Boundary of cathode at VIN-1.5V 6 5mA,VF = 3.08V 6 5mA,VF = 3.08V 4 3 3.25 3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5 4 3 3.25 3.5 3.75 4 4.25 VIN (V) 4.5 4.75 5 5.25 5.5 VIN (V) High Current Settings with Anode = VIN 26 Anode supply = VIN 25mA,VF = 3.37V High Current Settings with Anode = 5V 26 Anode supply = 5V 23 23 25mA,VF = 3.35V LED Current (mA) LED Current (mA) 20 Boundary at cathode = 150mV 17 15mA,VF = 3.27V 14 20 Boundary of cathode at VIN-1.5V 17 15mA,VF = 3.26V 14 11 10mA,VF = 3.20V 11 10mA,VF = 3.19V 8 3.25 8 3.5 3.75 4 4.25 4.5 VIN (V) 4.75 5 5.25 5.5 3 3.25 3.5 3.75 4 4.25 VIN (V) 4.5 4.75 5 5.25 5.5 6 SC620 Typical LED Current Matching 3.5 2.5 1.5 -40°C 85°C Gain Register Value = 0Ch 8 6 4 2 0 Typical LED Current Accuracy (25°C) All 8 LEDs fall between Max and Min, Gain Register Value = 0Ch % Matching 0.5 -0.5 -1.5 -2.5 -3.5 0.5 5.5 10.5 15.5 25°C % Accuracy Max -2 Min -4 -6 -8 0.5 20.5 25.5 5.5 10.5 15.5 20.5 25.5 LED Current (mA) LED Current (mA) Typical LED Current Accuracy (-40°C) 8 6 4 All 8 LEDs fall between Max and Min, Gain Register Value = 0Ch Typical LED Current Accuracy (85°C) 8 6 4 2 0 Max -2 Min -4 -6 -8 0.5 All 8 LEDs fall between Max and Min, Gain Register Value = 0Ch % Accuracy 0 -2 -4 -6 -8 0.5 Max Min % Accuracy 2 5.5 10.5 15.5 LED Current (mA) 20.5 25.5 5.5 10.5 15.5 LED Current (mA) 20.5 25.5 7 SC620 Pin Descriptions Pin # Pin Name Pin Function 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 T GND IN EN GND ILED1 ILED2 ILED3 ILED4 GND SDA SCL GND ILED5 ILED6 ILED7 ILED8 Thermal Pad Ground Input voltage supply Enable input — active high Ground Current sink input for LED 1 Current sink input for LED 2 Current sink input for LED 3 Current sink input for LED 4 Ground I2C serial data pin (bi-directional) I2C clock input Ground Current sink input for LED 5 Current sink input for LED 6 Current sink input for LED 7 Current sink input for LED 8 Thermal pad for heatsinking purposes. Connect to ground plane using multiple vias. Not connected internally. 8 SC620 Block Diagram VIN VIN DAC IN GND 2 Voltage Reference 1 DAC 5 ILED1 VIN 6 ILED2 VIN DAC EN 3 SCL 11 SDA 10 Digital Interface and Control Registers DAC 7 ILED3 VIN 8 ILED4 VIN DAC 13 ILED5 VIN DAC 14 ILED6 VIN DAC 15 ILED7 VIN DAC 16 ILED8 4 9 12 GND GND GND 9 SC620 Applications Information General Description The SC620 includes eight independently controlled current sinks designed to control LED backlighting for mobile phones and other battery-operated handheld devices. As LED forward voltages decrease for white, blue, and other colored LEDs, there is less need for voltage boosting devices for powering backlight and indicator LEDs. In these types of systems where there is a fixed supply voltage large enough to supply the LEDs or where the LEDs can be powered over the entire battery range, the SC620 provides a simple low-cost driver alternative to charge pump or inductor-based switching boost converters. failure. When the junction temperature exceeds 155°C, the device is disabled and remains disabled until the junction temperature drops by the hysteresis value. Layout Considerations The MLPQ-UT-16 package has a thermal die attach pad located at the center. This pad must be connected to the ground plane through multiple vias as shown (illustration not to scale). ILED7 ILED6 ILED5 ILED8 Ground plane SC620 GND GND Current Sink Design Each current sink is designed for a pin voltage range between 150mV and VIN - 1.5V. This feature allows the system to operate backlight LEDs with constant current without interference caused by blinking indicator LEDs or driving LEDs with various forward voltages and currents. CIN EN GND SCL SDA Protection Circuitry The SC620 contains protection circuitry that prevents damage from operating in an unspecified state. These features include: VIN ILED1 • • • Under-voltage Lockout Protection Over-temperature Protection Short-circuit Protection For low noise, four ground pins are located at the corner pins 1, 4, 9 and 12. Connect each of the ground pins directly to the ground plane as shown. The layout is simple and requires very few components in addition to the LEDs that it will drive. A 1μF decoupling capacitor at the IN pin is required. Place this capacitor near pin 2, and ground it close to the SC620 as shown. Under-Voltage Lockout An Under-Voltage Lockout Protection (UVLO) circuit disables the device in the event that the input voltage falls below the threshold. UVLO typically occurs at 2V. Hysteresis is provided to prevent chatter. Short-Circuit Protection The output sink pins ILED1 through ILED8 are protected against shorting to VIN, prevent device damage in the event of a shorted LED. The source lead of each sink is connected to ground, so the output sink pins do not require protection against being externally shorted to ground, as this would result in zero potential across the sink device. Over-Temperature Protection The Over-temperature Protection circuit helps prevent the device from overheating and experiencing a catastrophic ILED2 ILED3 ILED4 GND GND 10 SC620 Applications Information (continued) Application Circuit Examples Main Backlight Plus Sub-panel Backlight Plus Single RGB LED This example uses the SC620 to drive a main display, a sub-panel display, and an RGB LED. Independent outputs allow these functions to be supported simultaniously at different intensities. The VIN supply is typically single cell Li-Ion or 5.0V. VIN supply and LED anode voltage may be from different sources. The operating voltage limit of (VIN — 1.5V) at the sink pins must be observed to achieve the specified accuracy of the device. LED Backlighting Battery Main Panel Sub Panel Color/R/G/B LEDs 1μF 2 SCL SDA EN 11 10 3 1 4 9 12 IN SCL SDA EN GND GND GND GND SC620 ILED1 ILED2 ILED3 ILED4 ILED5 ILED6 5 6 7 8 13 14 15 16 ILED7 ILED8 11 SC620 Applications Information (continued) Backlighting Three LEDs of Any Color Combination Plus Lens Voice Coil Drive and One GPO This example uses the SC620 to drive 3 backlight LEDs, plus a voice coil actuator for lens auto-focus and one open-drain digital output. Independent outputs allow these functions to be supported simultaneously. The VIN supply is typically single cell Li-Ion or 5.0V. VIN and the LED anode voltage may be supplied by different sources. The operating voltage limit of (VIN — 1.5V) at the sink pins must be observed to achieve the specified accuracy of the device. VBAT = 2.7V to 5.5V LED Backlighting Main Panel VLOGIC Lens Focusing VBAT Voice Coil 1μF 2 SCL SDA EN 11 10 3 1 4 9 12 IN SCL SDA EN GND GND GND GND SC620 ILED1 ILED2 ILED3 ILED4 ILED5 ILED6 ILED7 ILED8 5 6 7 8 13 14 15 16 Digital Output Expander GPO 12 SC620 Applications Information (continued) Backlighting with Series Connected LEDs connected to a Boosted Output Voltage This example uses the SC620 to drive 32 LEDs in a 4-inseries by 8-in-parallel arrangement. Other arrangements of series and parallel combinations are possible. To prevent the boost voltage from illuminating the LEDs while the current sinks are off, the boost voltage must follow the SC620 in the start-up sequence. The boost voltage must also power-off before the current sinks turn off in the shut-down sequence. Protection diodes may be necessary to protect the current sinks from destructive voltage levels produced by the boost voltage supply. Schottky diodes are shown in the schematic for the purpose of voltage clamping. These diodes prevent damage to the current sinks in the event that the sink turns off while the boost circuit is on. The operating voltage limit of (VIN — 1.5V) at the sink pins must be observed to achieve the specified accuracy of the device. LED Backlighting DC/DC Boost Voltage Boost limiting R2 = (3/7)*(R1) + - R1 Limit SC620 sink pins to < [VIN – 1.5] 5V 2 SCL 11 10 3 1 4 9 12 IN SCL SDA EN GND GND GND GND SC620 ILED1 ILED2 ILED3 ILED4 ILED5 ILED6 5 6 7 8 13 14 1μF SDA EN ILED7 ILED8 15 16 13 SC620 Register Map Address 00h 01h 02h 03h 04h 05h 06h 07h 08h 09h Note (1) Default value is the register contents immediately following a high transition at the enable pin. D7 L8_EN 1 = on 0 = off D6 L7_EN 1 = on 0 = off D5 L6_EN 1 = on 0 = off D4 L5_EN 1 = on 0 = off D3 L4_EN 1 = on 0 = off D2 L3_EN 1 = on 0 = off D1 L2_EN 1 = on 0 = off D0 L1_EN 1 = on 0 = off Description LED on/off control LED1 dimming control LED2 dimming control LED3 dimming control LED4 dimming control LED5 dimming control LED6 dimming control LED7 dimming control LED8 dimming control gain register Default (1) 00h 01h 01h 01h 01h 01h 01h 01h 01h 08h X X X X X X X X X X X X X X X X X X L1_5 L2_5 L3_5 L4_5 L5_5 L6_5 L7_5 L8_5 X L1_4 L2_4 L3_4 L4_4 L5_4 L6_4 L7_4 L8_4 X L1_3 L2_3 L3_3 L4_3 L5_3 L6_3 L7_3 L8_3 G4 L1_2 L2_2 L3_2 L4_2 L5_2 L6_2 L7_2 L8_2 G3 L1_1 L2_1 L3_1 L4_1 L5_1 L6_1 L7_1 L8_1 G2 L1_0 L2_0 L3_0 L4_0 L5_0 L6_0 L7_0 L8_0 G1 SC620 Slave Address Following a start condition, the bus master outputs the address of the slave device. The 7 bit slave address for the SC620 is 1110 000x. The eighth bit is the data direction bit and also the least significant bit (LSB). E0h is used for a write operation, and E1h is used for a read operation. DEVICE ADDRESS 1 1 1 0 0 0 0 R/W 1/0 Table 1 - Gain Setting Values (default = 1000) G4 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 G3 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 G2 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 G1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Current Step Size (μA) 31.25 62.5 93.75 125 156.25 187.5 218.75 250 281.25 312.5 343.75 375 406.25 437.5 468.75 500 Dimming Control Register Description The dimming control registers set the multiplier used to determine the absolute current setting. Current setting for each current sink is determined by multiplying the current step size (as described in Table 1) by the decimal multiplier in each dimming control register. For example, if the current step size is set to 500μA and the L1 Dimming Control Register bits (L1_5 through L1_0) are set to 010100 (20 decimal), then the output current for ILED1 is set to 20 x 500μA = 10mA. Note that the maximum current setting occurs when the dimming control register bits are set to 110010 (50 decimal) - any bit combination larger than this one will default to the maximum setting. 14 SC620 Using the I2C Serial Port The I2C General Specification The SC620 is a read-write slave-mode I C device and complies with the Philips I 2C standard Version 2.1 dated January, 2000. The SC620 has eight user-accessible internal 8-bit registers. While there is no auto increment/decrement capability in the SC620 I2C logic, a tight software loop can be designed to randomly access the next register independent of which register you begin accessing. The start and stop commands frame the data-packet and the repeat start condition is allowed if necessary. 2 SC620 Limitations to the I2C Specifications Seven bit addressing is used and ten bit addressing is not allowed. Any general call address will be ignored by the SC620. The SC620 is not CBUS compatible. The SC620 can operate in standard mode (100kbit/s) or fast mode (400kbit/s). Combined Format — Read After the start condition [S], the slave address is sent, followed by an eighth bit indicating a write. The SC620 I2C then acknowledges that it is being addressed, and the master responds with an 8 bit data byte consisting of the register address. The slave acknowledges and the master sends the repeated start condition [Sr]. Once again, the slave address is sent, followed by an eighth bit indicating a read. The slave responds with an acknowledge and the previously addressed 8 bit data byte; the master then sends a non-acknowledge (NACK). Finally, the master terminates the transfer with the stop condition [P]. Supported Formats: Direct Format — Write The simplest format for an I2C write is Direct Format. After the start condition [S], the slave address is sent, followed by an eighth bit indicating a write. The SC620 I2C then acknowledges that it is being addressed, and the master responds with an 8 bit data byte consisting of the register address. The slave acknowledges and the master sends the appropriate 8 bit data byte. Once again the slave acknowledges and the master terminates the transfer with the stop condition [P]. Stop Separated Reads Stop separated reads can also be used. This format allows a master to set up the register address pointer for a read and return to that slave at a later time to read the data. In this format the slave address followed by a write command are sent after a start [S] condition. The SC620 then acknowledges it is being addressed, and the master responds with the 8-bit register address. The master sends a stop or restart condition and may then address another slave. After performing other tasks, the master can send a start or restart condition to the device with a read command. The SC620 acknowledges this request and returns the data from the register location that had previously been set up. 15 SC620 Using the I2C Serial Port (continued) I2C Direct Format Write S Slave Address W A Register Address A Data A P S – Start Condition W – Write = ‘0’ A – Acknowledge (sent by slave) P – Stop condition Slave Address – 7-bit Register address – 8-bit Data – 8-bit I2C Stop Separated Format Read Register Address Setup Access S Slave Address W A Register Address A P S S – Start Condition W – Write = ‘0’ R – Read = ‘1’ A – Acknowledge (sent by slave) NAK – Non-Acknowledge (sent by master) Sr – Repeated Start condition P – Stop condition Master Addresses other Slaves Slave Address B S/Sr Register Read Access Slave Address RA Data NACK P Slave Address – 7-bit Register address – 8-bit Data – 8-bit I2C Combined Format Read S Slave Address WA Register Address A Sr Slave Address R A Data NACK P S – Start Condition W – Write = ‘0’ R – Read = ‘1’ A – Acknowledge (sent by slave) NAK – Non-Acknowledge (sent by master) Sr – Repeated Start condition P – Stop condition Slave Address – 7-bit Register address – 8-bit Data – 8-bit 16 SC620 Outline Drawing — MLPQ-UT-16 3x3 A D B DIM A A1 A2 b D D1 E E1 e A2 A aaa C C A1 D1 e/2 LxN E/2 E1 SEATING PLANE L N aaa bbb MIN .018 .000 .007 .114 .061 .114 .061 DIMENSIONS INCHES NOM (.006) .009 .118 .067 .118 .067 .020 BSC .012 .016 16 .003 .004 .012 .122 .071 .122 .071 .020 0.18 2.90 1.55 2.90 1.55 MAX .024 .002 MILLIMETERS MIN 0.45 0.00 NOM (0.1524) 0.23 3.00 1.70 3.00 1.70 0.50 BSC 0.30 0.40 16 0.08 0.10 0.30 3.10 1.80 3.10 1.80 0.50 MAX 0.60 0.05 PIN 1 INDICATOR (LASER MARK) E 2 1 N e bxN D/2 bbb CA B NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS. 17 SC620 Land Pattern — MLPQ-UT-20 3x3 H R DIM C (C) K Z G G H K P Y R X X P Y Z DIMENSIONS INCHES (.114) .083 .067 .067 .020 .006 .012 .031 .146 MILLIMETERS (2.90) 2.10 1.70 1.70 0.50 0.15 0.30 0.80 3.70 NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 2. THERMAL VIAS IN THE LAND PATTERN OF THE EXPOSED PAD SHALL BE CONNECTED TO A SYSTEM GROUND PLANE. FAILURE TO DO SO MAY COMPROMISE THE THERMAL AND/OR FUNCTIONAL PERFORMANCE OF THE DEVICE. Contact Information Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805) 498-2111 Fax: (805) 498-3804 www.semtech.com 18