SC1404ISSTR

Mobile Multi-Output PWM Controller with Virtual Current SenseTM POWER MANAGEMENT Description The SC1404 is a multiple-output power supply controller designed for battery operated systems. The SC1404 provides synchronous rectified buck converter control for two power supplies. An efficiency of 95% can be achieved. The SC1404 uses Semtech’s proprietary Virtual Current SenseTM technology along with external error amplifier compensation to achieve enhanced stability and DC accuracy over a wide range of output filter components while maintaining fixed frequency operation. The SC1404 also provides two linear regulators for system housekeeping. The 5V linear regulator takes its input from the battery; for efficiency, the output is switched to the 5V output when available. The 12V linear regulator output is generated from a coupled inductor off the 5V switching regulator. Control functions include: power up sequencing, soft start, powergood signaling, and frequency synchronization. Line and load regulation is to +/-1% of the output voltage. The internal oscillator can be adjusted to 200 kHz or 300 kHz or synchronized to an external clock. The mosfet drivers provide >1A peak drive current for fast mosfet switching. The SC1404 includes a PSAVE# input to select pulse skipping mode for high efficiency at light load, or fixed frequency mode for low noise operation. SC1404 Features 6 to 30V input range (operation possible below 6V) 3.3V and 5V dual synchronous outputs Fixed-frequency or PSAVE for maximum efficiency over wide load current range 5V/50mA linear regulator 12V/200mA linear regulator TM Virtual Current Sense for enhanced stability Accurate low-loss current limiting Out-of-phase switching reduces input capacitance External compensation supports wide range of output filter components for reduced cost Programmable power-up sequence Power Good output Output overvoltage & overcurrent protection with output undervoltage shutdown 4µA typical shutdown current 6mW typical quiescent power Applications Notebook and Subnotebook Computers Automotive Electronics Desktop DC-DC Converters Typical Application Circuit Revision: May 19, 2004 1 www.semtech.com SC1404 POWER MANAGEMENT Absolute Maximum Ratings PAR AMETER VD D , V+, PHASE3, PHASE5 to GND PHASE3, PHASE5 to GND BST3, BST5, D H3, D H5 to GND PGND to GND VL to GND BST3 to PHASE3; D H3 to PHASE3; BST5 to PHASE5; D H5 to PHASE5 D ESC R IPTION Supply and Phase Voltages Phase Voltages Boost voltages Power Ground to Si gnal Ground Logi c Supply Hi gh-si de Gate D ri ve Supply Hi gh-si de Gate D ri ve Outputs Low-si de Gate D ri ve Outputs and C urrent Sense i nputs Logi c i nputs/outputs MAXIMU M -0.3 to +30 -2.0 (transi ent - 100 nsec) -0.3 to +36 ± 0.3 -0.3 to +6 -0.3 to +6 -0.3 to (+BSTx + 0.3) -0.3 to +(VL + 0.3) -0.3 to +(VL + 0.3) -0.3 to +(V+ + 0.3V) C onti nuous +5 +50 -0.3 to (+VD D + 0.3) C onti nuous 12V output current Juncti on Temperature Range juncti on to ambi ent Storage Temperature Range Lead Temperature +200 +150 76 -65 to +200 +300 °C , 10 second max. mA °C °C /Watt °C °C mA mA V PRELIMINARY 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. U N ITS V V V V V V V V V V D L3, D L5 to GND C SL5, C SH5, C SL3, C SH3 to GND REF, SYNC , SEQ, PSAVE#, ON5, RESET#, VL, FB3, FB5, C OMP3, C OMP5 to GND ON3, SHD N# to GND VL, REF Short to GND REF C urrent VL C urrent 12OUT to GND 12OUT Short to GND 12OUT C urrent TJ Package Thermal Resi stance TS TL Electrical Characteristics Unless otherwise noted: V+ = 15V, both PWMs on, SYNC = 0V, VL load = 0mA, REF load = 0mA, PSAVE# = 0V, TA =-40 to 85°C. Typical values are at TA = +25°C. Circuit = Typical Application Circuit PAR AMETER CONDITIONS MAIN SMPS CONTR OLLER S MI N T YP MAX UNITS Input Voltage Range 3V Output Voltage 5V Output Voltage Load Regulation Line Regulation  2004 Semtech Corp. 6 V+ = 6.0 to 30V, 3V load = 0A to current limit V+ = 6.0 to 30V, 5V load = 0A to current limit Either SMPS, 0A to current limit, PSAVE# = VL Either SMPS, 6.0 < V+ < 30V, PSAVE# = VL 2 30.0 3.3 5.0 -0.4 0.05 3.37 5.1 V V V % %/V 3.23 4.9 www.semtech.com SC1404 POWER MANAGEMENT Electrical Characteristics Cont. Unless otherwise noted: V+ = 15V, both PWMs on, SYNC = 0V, VL load = 0mA, REF load = 0mA, PSAVE# = 0V, TA =-40 to 85°C. Typical values are at TA = +25°C. Circuit = Typical Application Circuit PAR AMETER Current-Limit Thresholds (N ote 2) Zero Crossing Threshold Soft-Star t Ramp Time Oscillator Frequency Maximum Duty Factor SYN C Inp ut High Pulse SYN C Inp ut Low Pulse Width SYN C Rise/Fall Time SYN C Inp ut Frequency Range Current-Sense Inp ut Leakage Current CONDITIONS CSHX - CSLX (p ositive current) CSHX - CSLX (negative current) CSHX - CSLX PSAVE# = 0V, not tested From enable to 95% full current limit, with resp ect to fOSC SYN C = VL SYN C = 0V SYN C = VL SYN C = 0V N ot tested N ot tested N ot tested MI N 40 T YP 55 -50 5 512 MAX 70 UNITS mV mV clks 380 230 kHz % ns 220 170 92 94 300 200 94 96 300 300 200 240 350 kHz 10 µA CSH3 = 3.3V, CSH5 = 5.0V ER R OR AMP 3 DC Loop Gain Gain Bandwidth Product Outp ut Resistance From internal feedback node to COMP3/COMP5 18 8 V/V MHz Kohms COMP3, COMP5 INTER NAL R EGULATOR AND R EFER ENCE 25 VL Outp ut Voltage VL Undervoltage Lockout Fault Threshold VL Switchover Lockout REF Outp ut Voltage REF Load Regulation SHDN # = V+; 6V < V+ 9.6 V P h ase l ead f r om 3V t o 5V 41% of switching period N o overlap between 3.3V and 5V 59% of switching period Small overlap to prevent simultaneous 3V/5V switching 64% of switching period Small overlap to prevent simultaneous 3V/5V switching D3 D5 Iin I5in 9.6V > Vin > 6.7V average 0 6.7 > Vin Icap 0  2004 Semtech Corp. 15 www.semtech.com SC1404 POWER MANAGEMENT Typical Characteristics Input ripple current can be calculated from the following equations. PRELIMINARY IF_AVG 100n =I ⋅ = 0.2A LOAD TS D3 = 3.3V/V IN = 3V duty cycle D5 = 5V/V IN = 5V duty cycle I3 = 3V DC load current I5 = 5V DC load current DOVL = overlapping duty cycle of the 3V and 5V pulses (varies according to input voltage) where 100nsec is the estimated time between the mosfet turnoff and the Schottky diode turn-on and Ts = 3.33uS.A Schottky diode with a forward current of 0.5A is sufficient for this design. Operation below 6V input The SC1404 will operate below 6V input voltage with careful design, but there are limitations. The first limitation is the maximum available duty cycle from the SC1404, which limits the obtainable output voltage. The design should minimize all circuit losses through the system in order to deliver maximum power to the output. A second limitation with operation below 6V is transient response. When load current increases rapidly, the output voltage drops slightly; the feedback loop normally increases duty cycle briefly to bring the output voltage back up. If duty cycle is already near the maximum limit, the duty cycle cannot increase enough to meet the demand, and the output voltage sags more than normal. This problem can not be solved by changing the feedback compensation, it is a function of the input voltage, duty cycle, and inductor and capacitor values. If an application requires 5V output from an input voltage below 6V, the following guidelines should be used: 1 - Set the switching frequency to 200 kHz (Tie SYNC to ground). This increases the maximum duty cycle compared to 300 kHz operation. 2 - Minimize the resistance in the power train. Select mosfets, inductor, and current sense resistor to provide the lowest resistance as is practical. 3 - Minimize the pcb resistance for all traces carrying high current. This includes traces to the input capacitors, mosfetS and diodes, inductor, current sense resistor, and output capacitor. 4 - Minimize the resistance between the SC1404 circuit and the power source (battery, battery charger, AC adaptor). 5 - Use low ESR capacitors on the input to prevent the input voltage dropping during on-time. 6 - If large load transients are expected, high capacitance and low ESR capacitors should be used on both the input and output. DOVL = 0 for 9.6V ≤ VIN DOVL = (D5 - 0.41) for 6.7V ≤ VIN < 9.6V DOVL = (D5 - 0.36) for VIN < 6.7 IIN = Average DC input current IIN = I3 ⋅ D3 + I5 ⋅ D5 ISW_RMS = RMS current drawn from VIN ISW_RMS2 = D3⋅ I32 + D5 ⋅ I52 + 2 ⋅ DOVL ⋅ I3 ⋅ I5 IRMS_CAP = I SW_RMS 2 + IIN_AVE 2 The worst-case ripple current varies by application. For the case 6A load on both outputs, the worst-case ripple occurs at Vin = 7.5V, and the rms capacitor current is 4.2A. The reference design uses 4 paralleled ceramic capacitors, (Murata GRM32NF51E106Z, 10 uF 25V, size 1210). Each capacitor is rated at 2.2A. Choosing Synchronous mosfet and Schottky Diode Since this is a buck topology, the voltage and current ratings of the synchronous mosfet are the same as the main switching mosfet. It makes sense cost- and volume-wise to use the same mosfet for the main switch as for the synchronous mosfet. Therefore, IRF7413 is used again in the design for synchronous mosfet. To improve overall efficiency, an external Schottky diode is used in parallel with the low side mosfet. The freewheeling current enters the Schottky diode instead of the inefficient body diode of the synchronous mosfet. It is really important when laying out the board to place the synchronous mosfet and Schottky diode close to each other to reduce the current ramp-up and ramp-down time due to parasitic inductance between the channel of the mosfet and the Schottky diode. The current rating of the Schottky diode can be determined by the following equation:  2004 Semtech Corp. 16 www.semtech.com SC1404 POWER MANAGEMENT 5V Start-up with slow Vin ramp. Proper startup of the 5V output can be hampered by slow dV/dt on the input. The SC1404 will power up and attempt to generate an output when the input voltage exceeds 4.5 volts. If the input has a slow dV/dt, the input voltage will not rise significantly during the start-up sequence, leading to two conditions. First, the VL supply can be hundreds of mV below 5V, since the input may not yet be above 5V. Second, the duty cycle will be at maximum, leading to very small off-times. These two conditions tend to reduce the boost voltage; if continued indefinitely, the boost capacitor may be unable to recharge fully, and eventually the high-side driver loses its boost bias. To avoid this the following steps should be taken: 1. If possible the dV/dt of the input supply should exceed .02V/ usec. This dV/dt condition only applies when the input passes between 4 and 6 volts, the point at which the SC1404 begins a startup sequence. An alternative is to make sure the input voltage reaches 6 volts within 100 usec of SC1404 startup at approximately 4.2 volts. This is sufficiently fast to allow VL and duty cycle to achieve normal levels and prevents the boost voltage from falling. 2. If the input dV/dt cannot meet condition 1, the startup of the SC1404 should be delayed until the input voltage reaches 6V. This can be done using either the SHDN# or ON5 pin. If the dV/dt is moderate (slews from 4 to 6 volts in several msecs), an RC delay on either the SHDN# or ON5 pin should be enough to delay turn-on until the input reaches 6V. 3. For slow dV/dt on the input (10’s of msec), the SC1404 should be held off until the input reaches 6V. This can be done using a comparator or external logic to hold the SHDN# or ON5 pin low until the input reaches 6V. 12V Load Limitations The 12V regulator derives input power from a secondary winding on the 5V inductor. During the 5V off-time, the inductor transfers energy from the 5V winding to the secondary winding, thereby providing a crudely regulated 15V that feeds the 12V regulator. Note that duty cycle increases at low input voltages, and therefore the on-time decreases. At low input voltages, the duty cycle increases to maintain the 5V output. The off-time consequently decreases, which has two detrimental effects. It allows less time to recharge the raw 15V capacitor, and it also raises the peak 15V current required to maintain the average 12V load. The 15V winding needs higher peak current, delivered in less time. But the stray (leakage) inductance of the inductor resists rapid changes in winding current, and ultimately limits how much current can be drawn from 15V before the voltage falls.  2004 Semtech Corp. 17 www.semtech.com The following guidelines for 12V loading apply to the typical circuit, page 22. Vin range >10V 7V - 10V 12V load conditions 12V load < 1/2 * 5V load 12V load = 200mA max 12V load < 1/2 * 5V load Linearly derate 12V load: 200mA at 10V 100mA at 7V 12V load < 1/2 * 5V load Linearly derate 12V load: 100mA at 10V 25mA at 7V 6V - 7V SC1404 POWER MANAGEMENT Overvoltage Test Measuring the overvoltage trip point can be problematic. Any buck converter with synchronous mosfets can act as a boost converter, sending energy from output to input. In some cases the energy sent to the input is enough to drive the input voltage beyond normal levels, causing input overvoltage. To prevent this, enable the SC1404 PSAVE# feature, which effectively disables the low side mosfet drive so that little energy, if any, is transferred back to the input. PRELIMINARY Typical Characteristics 3.3V Efficiency 100 90 Efficiency (% ) 80 70 60 50 0.01 0.1 1 10 Load Current (A) 6V 10V 19V Semtech recommends the following circuit for measuring the overvoltage trip point. D1 prevents the output voltage from damaging lab supply 1. R1 limits the amount of energy that can be cycled from the output to the input. R2 absorbs the energy that might flow from output to input, and D2 protects lab supply from possible damage. The ON5 signal is monitored to indicate when overvoltage occurs. Initial conditions: Both lab supplies set to zero volts No load connected to 3V or 5V PSAVE# enabled (PSAVE# tied to GND) ON5 enabled ON3 enabled DVMs monitoring ON5 and the output under test. Oscilloscope probe connected to Phase Node of the output under test (not strictly required). Set Lab Supply 2 to provide 10V at the SC1404 input. The phase node of the output being tested should show some switching activity. The ON5 pin should be above 4V. Slowly increase Lab Supply 1 until the output under test rises slightly above it’s normal DC level. As Lab Supply 1 increases, switching activity at the phase node will cease. The ON5 pin should remain above 4V. Increase Lab Supply 1 in very small increments, monitoring both ON5 and the output under test. The overvoltage trip point is the highest voltage seen at the output before ON5 pulls low (approximately 0.3V). Do not record the voltage seen at the output after ON5 has pulled low; when ON5 pulls low, the current flowing in D1 changes, corrupting the voltage seen at the output. to DVM D1 e.g. 1N4004 R1 75 1/2W 1K Lab Supply 1 5V Efficiency 100 Efficiency (%) 95 90 85 80 0.01 0.1 6V 10V 19V 1 10 Load Current (A) D1 e.g. 1N4004 Vin Output under test VL Lab Supply 2 R2 470 1/2W SC1404 Evaluation Board ON5 to DVM  2004 Semtech Corp. 18 www.semtech.com SC1404 POWER MANAGEMENT Layout Guidelines As with any high frequency switching regulator design, a good PCB layout is essential to optimize performance of the converter. Before starting pcb layout, a careful layout strategy is strongly recommended. See the pcb layout in the SC1404 Evaluation Kit manual for example. In most applications, FR4 board material with 4 or more layers and at least 2-ounce copper is recommended(for output current up to 6A). Use at least one inner layer for ground connection. It is good practice to tie signal ground and power ground together at one single point so that the signal ground is not easily contaminated. Also be sure that high current paths have low inductance and resistance by making trace widths as wide as possible and lengths as short as possible. Use low-impedance bypassing for lines that pull large amounts of current in short periods of time. The following step by step layout strategy is recommended. Step #1. Power train components placement. a. Power train arrangement. Place power train components first. The figure below shows the recommended power train arrangement. Q1 is the main switching mosfet, Q2 is the low side mosfet, D1 is the Schottky diode and L1 is the output inductor. b. Current Sense. Minimize the length of current sense signal traces. Keep them less than 15mm. Kelvin connections should be used; try to keep the traces parallel to each other and route them close to each other as much as possible. Even though SC1404 implements Virtual Current Sense scheme, the current sense signal is sampled by the SC1404 to determine the PSAVE threshold. See the following figure for a Kelvin connection of the current sense signal. L1 SC1404 CSH CSL Rcs Q1 D1 Q2 L1 c. Gate Drive. SC1404 has built-in gate drivers capable of sinking/sourcing 1A peaks. Upper gate drive signals are noisier than the lower ones. Therefore, place them away from sensitive analog circuitries. Make sure the lower gate traces are as close as possible to the IC pins and both upper and lower gate traces as wide as possible. Step #2: PWM controller placement (pins) and signal ground island. Connect all analog grounds to a separate solid copper island plane, which connects to the SC1404’s GND pin. This includes REF, COMP3, COMP5, SYNC, ON3, ON5, PSV# and RESET#. Step #3: Ground plane arrangement. There are several ways to tie the different grounds together. Since this is a buck topology converter, the output ground is relatively quieter than the input ground. Therefore connect analog ground to power ground at the output side. Often it is useful to use a separate ground symbol for the two grounds, and tie the two grounds together at a single point through a 0Ω resistor. The power ground for the input side and the power ground for the output side is the same ground and they can be tied together using internal planes. 19 www.semtech.com The phase node is generally the largest source of noise in the converter circuit since it switches at very high rate of speed. The phase node connections should be kept to a minimum size consistent with its connectivity and current carrying requirements. Place the Schottky diode as close to the phase node as possible to minimize the trace inductance between it and the low side mosfet, to reduce the efficiency loss due to the current ramp-up and down time. This is important when the converter needs to handle high di/dt requirements.  2004 Semtech Corp. VIN B_JACK_PAIR J1 POS 1 VDD C3 0.22uF 1 2 2 R1 2 10 2 1 BAT54A JP4 1 VL 8 7 6 5 C13 100pF C14 100pF V+ J27 V+ D1 1 1 C4 0.22uF COMP3 COMP5 2 2 VIN NEG J24 1 2 1 C5 10uF/25V C6 10uF/25V 1 1 1 GND GND GND 1 5 6 7 8 7 POWER MANAGEMENT Evaluation Board Schematic 1 3 2 1 LX3 1 2 3 2 1 5 6 7 8 2 DL3 T/L2 TTI8215 8 7 6 5 D J6 L1 2 LX5 DL5 D POS 6.8uH 1 0 0.22uF 3_3V R6 LX3 1 10 6 5 B_JACK_PAIR 0.22uF 1 C15 R5 C16 R4 0 1 BST5 J23 LX5 4 3_3V J22 4 DH3 1 C NEG 2 IRF7413 BST3R 30BQ015 BST5R A C C 27 16 26 23 24 20 22 25 21 19 28 18 17 15 D3 140T3 4 SEQ 3 2 1 V+ VL 1 2 3 DL3 DL5 DH3 DH5 BST3 SHDN PGND R23 0 ohm BST5 A PHASE3 RUN/ON3 PHASE5 R19 NO_POP SEQ C39 1uF A D5 2 A R22 0 Ohm NO_POP C20 D4 30BQ015 J19 1 R21 NO_POP J20 1 C38 1uF 2 R18 NO_POP 1 1 CSH3 CSL3 COMP3 12OUT VDD SYNC TIME/ON5 GND REF PSAVE RESET COMP5 CSL5 CSH5 1 J21 1 2 3 4 5 6 7 8 12 13 10 11 14 C29 NO_POP CSH3 CSH3 COMP3 COMP5 RESET# REF SYNC ON3 1 2 R13 2M 1 1 SHDN# R14 1 R15 1 R16 1k 2 5 4 3 2 1 T-ON5 VIN C37 0.01uF 6 7 8 9 10 C27 0.01uF VIN VL S1 DIP_SW5_PTH 1 R17 VDD PSV# R12 2M 2 2M 2 2M 2 2 2M C25 1uF/16V 1 9 C35 0.1uF C36 0.1uF JP1 2 20 U1 JP2 JP3 VL SC1404ITS 140T3 J17 CSH5 C34 0.1uF CSH5 C28 NO_POP CSL5 1 CSL3 C33 0.1uF +12V J25 1 +12V 2 1 1 NEG NO_POP NO_POP C  2004 Semtech Corp. C2 10uF/25V C9 4.7uF/35V 4.7uF/16V DH5 BST3 4.7uF/25V 4 C10 0.1uF D VIN C1 10uF/25V 1 J2 D6 MBRS1100T3 J3 J4 J5 GND C11 C12 0.1uF Q1 IRF7413 C42 C41 NO_POP Q2 IRF7413 D J16 3_3V 1 0.005 180uF/4V Q3 4 C17 IRF7413 Q4 R20 R7 J18 0.005 1 5V 5V J7 B_JACK_PAIR 5V 150uF/6.3V 1 POS D2 C18 C19 RES J12 RE J8 RE C26 0.1uF GND J26 C22 1 4.7uF/16V C40 0.1uF REF J10 1 C43 NO_POP P SYNC J9 1 ON3 1 J11 T-ON5 1 J13 1 VL VL J14 SHDN# 1 J15 PRELIMINARY SC1404 www.semtech.com S C 1404 E V B S chem atic SC1404 POWER MANAGEMENT Evaluation Board Bill of Materials ITEM 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 2 2 1 QT Y 4 1 DESIGNATION C1,C2,C5,C6 C3, C4, C15, C16 C9 C10,C12,C26,C33,C34,C35,C36,C40 C11,C22 C14,C13 C17 C19 C25 C37,C27 C39,C38 C42 D1 D2, D4 D3, D5 D6 BAT54A 30BQ015 MBRS140T3 MBRS1100T3 40V, 1A Schottky Y475M250N ECJ1VC1H101K EEF-UE0G181R EEF-UE0J151R ECJ3FB1C105 ECJ1VB1C104K PAR T NUMBER GRM230Y5V106Z025 DESCR IPTION 10uF, 25V 0.22uF, 50V, Y5V 4.7uF, 35V 0.1uF,50V, X7R 4.7uF, 16V 100pF, 50V 180uF, 4V 150uF, 6.3V 1uF, 16V 0.01uF, 50V 1uF 4.7uF, 25V 30V, 200ma, dual C_Anode Zetex I. R . Motorola Motorola SOT-23 SMC SMB SMB Panasonic N ovacap Panasonic Panasonic Panasonic Panasonic Panasonic MANUFACTUR ER Murata Panasonic FOR M FACTOR 1210 805 B_case 0603 1812 0603 D_Case_7343 D_Case_7343 1206 0603 0603  2004 Semtech Corp. 21 www.semtech.com SC1404 POWER MANAGEMENT Evaluation Board Bill of Materials Cont. ITEM 17 18 19 20 21 22 23 24 25 26 27 28 29 QT Y 4 3 24 1 4 1 4 2 5 1 1 DESIGNATION JP1, JP2, JP3, JP4 J1, J6, J7 J2-J5, J8-J27 L1 Q1, Q2, Q3, Q4 R1 R4, R5, R22, R23 R6, R7 R12, R13, R14, R15, R17 R16 SW1 T/L2 U1 TTI-8215 SC1404ITS DR127-6R8 IRF7413 Any Any WSL2512R005FB43 Any Any PART NUMBER DESCRIPTION 2 Pin Berg Connector Banana Jack Pair Test Points SMT Inductor 6.8uH 30V N-channel MOSFET 10ohm 0ohm 5mohm 2Megohm 1Kohm 5-position Dipswitch Coiltronics International Rectifier A ny A ny Vishay Dale A ny A ny Any Transpower Technologies Semtech SO8 0603 0603 2512 0603 0603 PRELIMINARY MANUFACTURER FORM FACTOR Berg 1 1  2004 Semtech Corp. 22 www.semtech.com SC1404 POWER MANAGEMENT Evaluation Board Gerber Plots To p Inner2 Inner1 Bottom  2004 Semtech Corp. 23 www.semtech.com SC1404 POWER MANAGEMENT Outline Drawing - TSSOP-28 PRELIMINARY Land Pattern - TSSOP-28  2004 Semtech Corp. 24 www.semtech.com SC1404 POWER MANAGEMENT Outline Drawing - SSOP-28 Land Pattern - SSOP-28 X DIM (C) G Z C G P X Y Z DIMENSIONS INCHES MILLIMETERS .281 .216 .026 .017 .065 .346 (7.15) 5.50 0.65 0.43 1.65 8.80 Y 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  2004 Semtech Corp. 25 www.semtech.com