SC190CEVB

POWER MANAGEMENT Description The SC190 is a synchronous step-down converter with integrated power devices and an integrated front-end LDO to minimize input supply ripple. Output voltage is programmable using two control bits, eliminating the need for feedback resistors tied to the output. The device is offered in four distinct variants with each variant providing four fixed output voltage options to choose from. The front-end LDO can be bypassed externally to maximize efficiency. A second LDO is switched in place of the switching regulator for low current operation to further improve efficiency and reduce noise. SC190 Synchronous Buck Converter with Programmable Output Features Features  Less than 1mV Supply Ripple  Output Voltage Regulated by Either the Switching     Regulator or Linear Regulator Dynamic Handover Between Linear and Switching Regulator for Maximum Efficiency 2.7V to 5.5V Input Range 300mA Guaranteed Output Current Fixed Frequency 1MHz Operation or 750kHz to 1.5MHz Clocked Operation No Schottky Diode Required Up to 95% Efficiency (VIN=BP) Over-current Protection Over-voltage Protection Over-temperature Protection Soft Start MLP-10, 3 x 3mm Lead-frame, Lead-free Package Low Output Noise < 100µVrms     The SC190’s flexible clocking scheme allows it to be  synchronized to an external oscillator or controlled by the  internal oscillator. The 1MHz switching frequency allows  the use of small inductors and capacitors.  The internal MOSFET switches provide peak current greater than 500mA to achieve a DC output of at least 300mA. Shutdown current is typically 0.1µA. Applications Cell Phones Cordless Phones Notebook and Subnotebook Computers PDAs and Mobile Communicators WLAN Peripherals 1 Li-Ion or 3 NiMH/NiCd Powered Devices    The SC190 has four different variants with four voltage  settings each. It is designed for single-cell Li-ion battery  applications, but also performs well in fixed 3.3V and 5V  applications. Typical Application Circuit VIN VIN EN SC190 4.7µH LX VOUT VOUT LOUT CIN 4.7µF SYNC/PWM VID0 VID1 MODE GND BP COUT CBP 4.7µF 4.7µF June 30, 2005 1 www.semtech.com SC190 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 VIN Input Logic Inputs (SYNC/PWM, EN, MODE, VID0, and VID1) LX Voltage VOUT Voltage BP Voltage Thermal Impedance Junction to Ambient VOUT Short Circuit to GND BP Current LX Current Storage Temperature Junction Temperature Peak IR Reflow Temperature * Tied to PCB with 1 square inch, 2 ounce copper. Symbol VIN VN VLX VOUT VBP θJA tSC IBP ILX TS TJC TLEAD Maximum -0.3 to 7 -0.3 to 7 -1 to BP +1 -0.3 to VIN + 0.3 VIN -0.3 to VIN + 0.3 *31 Continuous 0.8 +1.2 -65 to +150 +150 260 Units V V V V V ° C/W s A A ° ° ° C C C Electrical Characteristics Unless otherwise noted: VIN = 3.6V, SYNC/PWM = VIN, MODE = GND, EN = VIN, TA = -40 to 85°C. Typical values are at TA = +25°C. This device is ESD sensitive. Use of standard ESD handling precautions is required. Parameter Input Voltage Range Symbol VIN Conditions VIN = VBP VIN ≠ VBP Min 2.7 2.9 Typ Max 5.5 5.5 Units V V mV Input Voltage Ripple Line Regulation VIN PK-PK VLINEREG CIN, CBP = 10µF 190A, B and D: see note (1) 190C: see note (2) -0.3 -0.5 1 0.3 0.5 0.002 0.3 0.2 1.25 %/V %/V %/mA Ω Ω ms Load Regulation P-Channel On Resistance N-Channel On Resistance Start Up Time VLOADREG RDSP RDSN TSTART IOUT = 5mA to 300mA ILX = 100mA ILX = 100mA IOUT = 150mA  2005 Semtech Corp. 2 www.semtech.com SC190 POWER MANAGEMENT Electrical Characteristics (Cont.) Unless otherwise noted: VIN = 3.6V, SYNC/PWM = VIN, MODE = GND, EN = VIN, TA = -40 to 85°C. Typical values are at TA = +25°C. This device is ESD sensitive. Use of standard ESD handling precautions is required. Parameter Symbol Conditions IOUT = 150mA Min -3 3 -1.5 -1.5 -0.1 -0.3 20 Typ Max 3 3 1.5 1.5 0.1 0.3 Units % % % % %/mA %/V mA mV mA mA µA µA µA µA µVRMS VOUT Accuracy VOUT MODE = VIN, IOUT = 1mA IOUT = 150mA, TA = +25°C MODE = VIN, IOUT = 1mA, TA = +25°C Back-end LDO Load Regulation (BELDO) Back-end LDO Line Regulation (BELDO) Back-end LDO Current Limit (BELDO) Front-end LDO (FELDO) P-Channel Current Limit N-Channel Current Limit Quiescent Current Shutdown Current LX Leakage Current PMOS LX Leakage Current NMOS Output Voltage Noise VOUTLOADREG VOUTLINEREG Iout LIMLDO VBP ILIM(P) ILIM(N IQ ISD ILXP ILXN en fOSC fSYNCU fSYNCL IOUT= 100µA to 5mA MODE = VIN VIN = 2.7V to 5.5V MODE = VIN MODE = VIN IBP = 180mA(3) 40 300 60 325 860 -520 15 1 1 500 -270 MODE = VIN, IOUT = 100µA(4) EN = 0 VIN = 5.5V, LX = 0V, EN = 0 VIN = 5.5V, LX = 5.5V, EN = 0 COUT = 4.7µF, VOUT = 1V, IOUT = 1mA, 100Hz < f < 100kHz 0.87 -20 630 -420 10 0.1 0.1 0.1 93 Oscillator Frequency SYNC Frequency (upper) SYNC Frequency (lower) 1.0 1.5 1.12 MHz MHz 750 kHz  2005 Semtech Corp. 3 www.semtech.com SC190 POWER MANAGEMENT Electrical Characteristics (Cont.) Unless otherwise noted: VIN = 3.6V, SYNC/PWM = VIN, MODE = GND, EN = VIN, TA = -40 to 85°C. Typical values are at TA = +25°C. This device is ESD sensitive. Use of standard ESD handling precautions is required. Parameter UVLO Threshold (lower) UVLO Hysteresis Thermal Shutdown Thermal Shutdown Hysteresis Logic Input High Logic Input Low Logic Input Current High Logic Input Current Low Symbol VUVL VUVLHYS THI THYSR VIH VIL Conditions Min 2.4 Typ 2.5 50 145 10 Max 2.6 Units V mV ° C C ° EN, SYNC/PWM, MODE, VID0, VID1 EN, SYNC/PWM, MODE, VID0, VID1 EN, SYNC/PWM, MODE, VID0, VID1 EN, SYNC/PWM, MODE, VID0, VID1 1.6 0.6 -2 -2 0.1 0.1 2 2 V V µA µA IIH IIL Notes: (1) Line regulation is tested with 2.7V < VIN < 5.5V and the following output voltage settings: · SC190A - 1.8V · SC190B - 1.8V · SC190D - 1.4V (2) Line regulation is tested with 3.7V < VIN < 5.5V and VOUT = 2.6V for the SC190C version. The input voltage range is reduced due to the higher output voltage settings of the SC190C. This also forces the specification range to grow wider because it is expressed as a percentage of the input voltage range. (3) Tested at IBP = 180mA. Equivalent to IOUT = 300mA at VOUT = 1.8V. (4) IQ = IIN - IOUT.  2005 Semtech Corp. 4 www.semtech.com SC190 POWER MANAGEMENT Pin Configuration Ordering Information Device SC190AIMLTRT BP VIN VOUT EN MODE 1 2 3 4 T (1) Package MLP 3X3-10 10 LX GND VID1 VID0 SYNC/PWM SC190BIMLTRT(1) SC190CIMLTRT(1) SC190DIMLTRT(1) SC190AEVB SC190BEVB SC190CEVB SC190DEVB TOP VIEW 9 8 7 6 Evaluation Board(2) 5 MLP10: 3X3 10 LEAD (1) Lead-free packaging only. This product is fully WEEE and RoHS compliant. Available on tape and reel only. A reel contains 3000 devices. (2) Part specific evaluation boards - consult factory for availability. Programmable Output Voltage VID1 0 0 1 1 VID0 0 1 0 1 SC190A 1.8V 1.85V 1.75V 1.9V SC190B 1.2V 1.5V 1.0V 1.8V SC190C 2.5V 2.8V 2.6V 2.7V SC190D 1.3V 1.35V 1.375V 1.4V Pin Descriptions Pin # 1 2 3 4 5 6 7 8 9 10 T Pin Name BP VIN VOUT EN MODE SYNC/PWM VID0 VID1 GND LX Thermal Pin Function Regulated output, with respect to VIN, of the front-end LDO. A decoupling capacitor is connected to this pin. This input goes directly to the internal MOSFET switch. Input power supply voltage. Regulated output voltage and feedback for SC190. Enable (digital input): high input enables the SC190, a low disables and reduces quiescent current to 0.1µA. In shutdown, LX becomes high impedance. Mode select pin (digital input): MODE = VIN - linear regulator mode; MODE = GND - switcher mode. Oscillator synchronization input. Tie to VIN for forced continuous mode or external clock for frequency synchronization. Logic level Bit 0 used in conjunction with VID1 to set the output voltage. Logic level Bit 1 used in conjunction with VID0 to set the output voltage. Ground. Inductor connection to the switching FETs. Pad for heatsinking purposes. Not connected internally. Connects to ground plane using multiple vias.  2005 Semtech Corp. 5 www.semtech.com SC190 POWER MANAGEMENT Block Diagram 2 REF LDO Error Amp VIN Front-End LDO P Limit Amp 1 BP REF Current Amp SYNC/ PWM 6 OSC and Slope Generator 10 LX MODE 5 Handover Timing PWM comp Control Logic LDO Error Amp 500 mV reference 9 GND Error Amp VOUT 3 Back-End LDO N Limit Comp REF VID0 7 VID1 Voltage Select 8 EN 4  2005 Semtech Corp. 6 www.semtech.com SC190 POWER MANAGEMENT Applications Information SC190 Detailed Description The SC190 is a step-down, pulse-width-modulated (PWM) DC-DC converter with a low dropout (LDO) pre-regulator and a low current LDO regulator for operation in low power modes. The device has an internal synchronous rectifier and does not require a Schottky diode on the LX pin. The device is designed to operate as a buck converter in PWM mode with a fixed frequency of 1MHz, but at loads below 5mA, the part can be operated as an ultra-low current LDO regulator to minimize supply current. Programmable Output Voltage The SC190 has four device variants (SC190A, SC190B, SC190C, SC190D) each with a distinct range of output voltages. The output voltage of each variant has four predetermined values which can be individually selected by the correct programming of the VID0 and VID1 pins. (See “Programmable Output Voltage” table on page 5). Note that the SC190C has much higher output voltage settings than the other three variants. This device was intended for use with higher input voltages, so some performance over the entire input voltage range cannot be guaranteed. Switcher Mode with less than 1mV supply ripple This is a fixed frequency current mode architecture with the input supply for the switching regulator pre-regulated by a front-end LDO regulator. This technique reduces the supply voltage ripple from 20mV, typically seen from a switching converter, to approximately 1mV for the SC190. The supply to the switcher is regulated to the supply voltage minus approximately 300mV. Current feedback for the switching regulator is through the PMOS current path and it is amplified and summed with the internal slope compensation network and level shift. The voltage feedback loop is through an internal feedback divider. The ON time is determined by comparing the summed current feedback and the output of the error amplifier. The period is set by the onboard oscillator or by an external clock attached to the SYNC/PWM pin. Efficiency at moderate to high loads can be improved by shorting the VIN to BP pins at the expense of higher input voltage ripple. Continuous Conduction & Oscillator Synchronization The SC190 is designed to operate in continuous conduction mode thereby maintaining a fixed frequency. When the SYNC/PWM pin is tied high the part runs under control of the internal oscillator. The part can be synchronized to an external clock by driving a clock signal into the SYNC/ PWM pin. The part synchronizes to the rising edge of the clock. Back End LDO Mode The SC190 ultra-low current linear regulator regulates the same output as the switching regulator. The linear regulator minimizes the supply current drawn at light loads consuming only 10µA when supporting a 100µA load. The SC190 can swap between switching regulator and linear regulator mode under control of the MODE pin (see “handover” section). In this way the part either operates at a fixed frequency or DC output, thereby never generating load dependant frequencies that are typically seen with lightly loaded switching regulators. Handover (Switcher Mode to LDO Regulator Mode, LDO Regulator Mode to Switcher Mode) The device can be switched between Switcher mode and Linear regulator mode and back to Switcher mode without having to disable and re-enable the part. The output maintains regulation during the switch over. Linear Regulator Mode to Switching Mode Transition Switching Converter IOUT Specification Applies 200ìµs s VMODE (Pin 5) Wait Time IOUT (Pin 3) < 5mA Time < 300mA Switching Mode to Linear Regulator Mode Transition Linear Regulator IOUT Specification Applies 100ì s µs VMODE (Pin 5) Wait Time IOUT (Pin 3) < 300mA Time < 5mA  2005 Semtech Corp. 7 www.semtech.com SC190 POWER MANAGEMENT Applications Information The output load in switcher mode has to be reduced to a load that the LDO regulator can support before switching between the two modes to minimize output voltage deviation. The transition from LDO regulator mode to switcher mode requires the load to be kept at levels the LDO regulator can support for a given time period after the MODE pin has been pulled low (see Timing Diagram on page 7). Overvoltage Protection Overvoltage protection is provided on the SC190. In the event of an overvoltage on the output in switcher mode, the drive to the PWM stage is disabled and the part will not resume switching until the output voltage has fallen to below 2% of the regulation voltage. Soft-Start The soft-start mode is enabled after every shutdown cycle to limit in-rush current. In conjunction with the frequency foldback this controls the maximum current during the start-up. The switcher’s PMOS current limit is stepped from 25%, to 50%, to 75%, and then 100% of its typical value by the internal oscillator. The oscillator frequency is stepped by 1/8, 1/4, 1/2 and 1 under the control of 4 output voltage thresholds causing modulation of the softstart timer (see Current Limit description in the Protection Features section). As soon as the part reaches regulation, soft-start mode is disabled. 100 Percent Duty Cycle Operation The SC190C has a 100% duty cycle mode of operation to allow the switcher to regulate the output at low input voltage to high output voltage conditions. As the input supply drops towards the output voltage, the PMOS ontime increases linearly until a point where the PMOS FET is on for 100% of the time. Once the PMOS is on DC the output voltage will track the input voltage minus the voltage drop across the PMOS power device according to the following relationship: Vout = Vin – Iout ( Rdsp + Rind ) Vout = Output Voltage Vin = Input Voltage Iout = Output current Rdsp = PMOS switch ON resistance Rind = Series resistance of the inductor Protection Features • • • • The SC190 provides the following protection features: Thermal Shutdown Current Limit Overvoltage Protection Soft-Start Thermal Shutdown The device has a thermal shutdown feature to protect the device if the junction temperature exceeds 150°C. In thermal shutdown the PWM drive is disabled tri-stating the LX output and the front-end LDO is disabled. The device will not be enabled again until the temperature reduces by 10°C. If during this time the output falls by greater than 60% of its regulation voltage a soft start will be invoked. Thermal shutdown is not active during LDO mode in order to minimize supply current. Current Limit The part has a number of current limit functions. The Frontend LDO regulator has a current limit set at approximately 500mA, which will protect the FELDO regulator in the event of a pulsed short circuit. The PMOS and NMOS power devices of the buck switcher stage are protected by current limit functions. In the case of a short to ground on the output, the part enters frequency foldback mode which causes the switching frequency to divide by a factor determined by the output voltage, stopping the inductor current “stair stepping.” The back-end LDO regulator has a current limit feature which will limit the maximum output current during LDO regulator mode to 50mA.  2005 Semtech Corp. 8 www.semtech.com SC190 POWER MANAGEMENT Applications Information (Cont.) Output Filter The SC190 series of synchronous step-down converters have internal loop compensation. The internal compensation is designed to work with a certain output filter corner frequency defined by the equation: Inductor Selection As previously stated the value of the inductor should be in the range 4.7µH to 10µH. The magnitude of the inductor current ripple is dependant on the inductor value and can be determined by the following equation: 1 fc = 2π L • C The internal compensation is optimized to operate with an output filter, L=4.7µH & COUT = 10µF. When selecting output filter components the LC product should not vary over a wide range. Table 1: Output Filter combinations L(µH) 4.7 4.7 10 COUT(µF) 4.7 10 10 Vo Vo 1 −    Vi  ∆IL =  L•f This equation demonstrates the relationship between VIN,VOUT & IL. The inductor ripple current decreases with higher inductance & increases with higher VIN or VOUT . To maximize efficiency the inductor should have a low DCR to minimize the conduction losses. As a minimum requirement the DC current rating of the inductor should be equal to the maximum load current plus half of the inductor current ripple and can be determined by the following equation: ILpk = Iout (max) + The selection of smaller inductor & capacitor values will move the corner frequency, having an impact on system stability. Due to this issue the practical lower limit for the inductor value is 4.7µH. ∆IL 2 Alternatively, set the inductor saturation current to be greater than the switch current limit as a maximum limit. ISAT > PMOS. Final inductor selection will depend on various design considerations such as efficiency, EMI, size and cost. Table 2 lists the manufacturers of practical inductor options. Table 2 - Recommended Inductors Manufacturer TDK Sumida Taiyo Yuden Coilcraft Coilcraft Part Number LDR655312T-4R7W CDRH3D16LD LMNP04SB100M LPS3015 LP06610-103M Value (µH) 4.7 4.7 10 10 10 DCR (Ω) 0.206 0.073 0.066 0.044 0.41 Rated Current (A) 0.9 0.68 0.9 Saturation Tolerance Current (A) % 0.65 0.8 20 30 20 20 20 Dimensions (LxWxH mm) 6.5 x 5.3 x 1.2 4 x 4 x 1.8 5x5x2 3 x 3 x 1.5 6.9 x 3.8 x 1.0  2005 Semtech Corp. 9 www.semtech.com SC190 POWER MANAGEMENT Applications Information (Cont.) PCB Layout Considerations Poor layout can degrade the performance of the DCDC converter and can be a contributory factor in EMI problems, ground bounce and resistive voltage losses. Poor regulation and instability can result. A few simple design rules can be implemented to ensure good layout: 1. Place the inductor and filter capacitors as close to the device as possible and use short wide traces between the power components. 2. Route the output voltage feedback path away from inductor and LX node to minimize noise and magnetic interference. Use a ground plane to further reduce noise interference on sensitive circuit nodes. Suggested Layout  2005 Semtech Corp. 10 www.semtech.com SC190 POWER MANAGEMENT Applications Information (Cont.) CIN Selection The source input current to the SC190 buck converter is a DC supply current with a triangular ripple riding on it. To prevent large input voltage ripple a low ESR ceramic capacitor is required. A minimum value of 4.7µF should be used for sufficient input voltage filtering and a 10µF MLCC should be used for optimum input voltage filtering. Input voltage ripple of approximately 1mV can be achieved when CIN = 10µF, and the front-end LDO regulator is active and pre-regulating the input supply to the switching regulator. (See page 12: Input Voltage Ripple graphs). COUT Selection A 10µF ceramic capacitor is recommended for the output filter capacitor. Output voltage ripple is dominated by the filter capacitance as shown in the following equation: Vout _ ripple = ∆IL(ripple ) • Cout (ESR) Choose an X7R or X5R ceramic dielectric for low ESR and superior temperature and voltage characteristics. Do not use Y5V capacitors - their temperature coefficients make them impractical for this application. Table 3: Recommended Capacitors Manufacturer Murata Murata TDK Part Number GRM188R60J475KE19D GRM188R60G106ME47D C1608X5ROG106M Value (µF) 4.7 10 10 Rated Voltage (VDC) 6.3 4 4 Type X5R X5R X5R Case Size 0603 0603 0603  2005 Semtech Corp. 11 www.semtech.com SC190 POWER MANAGEMENT Typical Characteristics NOTE: Conditions: L = 10µH, Cout = 10µF Input Voltage Ripple (FELDO bypassed) Input Voltage Ripple (FELDO active) VIN(AC) VIN(AC) LX LX IL IL Handover Transition Linear to Switcher Mode LX Handover Transition Switcher to Linear Mode LX VOUT(AC) VOUT(AC) IL IL  2005 Semtech Corp. 12 www.semtech.com SC190 POWER MANAGEMENT Typical Characteristics (Cont.) SC190C Line Regulation (FELDO Bypassed) 2.9 SC190C Line Regulation (FELDO Active) 2.9 2.8 OUTPUT VOLTAGE (V) 2.7 OUTPUT VOLTAGE (V) VOUT = 2.8V IOUT = 0.15A 2.8 VOUT = 2.8V IOUT = 0.15A 2.7 2.6 2.6 2.5 VOUT = 2.5V IOUT = 0.15A 2.5 VOUT = 2.5V IOUT = 0.15A 2.4 2.4 2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 INPUT VOLTAGE (V) INPUT VOLTAGE (V) Efficiency vs Load Current (FELDO Active) - VOUT = 1 .8V 100 90 80 70 100 90 80 70 Efficiency vs Load Current (FELDO Bypassed) - VOUT = 1 .8V EFFICIENCY (%) 60 50 40 30 20 10 0 0.01 EFFICIENCY (%) 60 50 40 30 20 10 0 0.01 Vin = 3.0V Vin = 3.6V Vin = 4.2V Vin = 3.0V Vin = 3.6V Vin = 4.2V 0.1 1 OUTPUT CURRENT (A) OUTPUT CURRENT (A) 0.1 1 6 5.5 5 Maximum Input Voltage vs Synchronization Frequency - VOUT = 1 .0V 0.5 Output Voltage vs Synchronization Frequency 0.4 INPUT VOLTAGE (V) 4.5 0.3 3.5 3 2.5 2 1.5 1 0.5 0 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 %VOUT(NOM) (v) 4 0.2 0.1 0 -0.1 VIN = 3.6V VOUT = 1.0V IOUT = 0.15A -0.2 0.7 0.9 1.1 1.3 1.5 FREQUENCY (MHz) FREQUENCY (MHz)  2005 Semtech Corp. 13 www.semtech.com SC190 POWER MANAGEMENT Typical Characteristics (Cont.) Quiescent Current vs Temperature 14 1200 Oscillator Frequency vs Temperature OSCILLATOR FREQUENCY (kHz) 12 QUIESCENT CURRENT (µA) 1000 10 800 8 600 6 4 400 2 Vin = 2.7V Vin = 3.6V Vin = 5.5V Vin = 2.7V 200 Vin = 3.6V Vin = 5.5V 0 -40 -20 0 20 40 60 80 100 120 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) TEMPERATURE (°C) Input Current vs Output Current 1000 100 INPUT CURRENT (mA) 10 1 0.1 Linear Regulator Switching Regulator 0.01 0.01 0.1 1 10 100 1000 OUTPUT CURRENT (mA)  2005 Semtech Corp. 14 www.semtech.com SC190 POWER MANAGEMENT Evaluation Board Schematic VIN TP1 VIN 2 J1 JUMPER1 VIN 1 C1 10uF R1 1M R2 1M R3 1M R4 1M R5 1M TP7 LX NODE TP8 VOUT sense TP13 VOUT load 2 EN MODE SYNC/PWM VID0 VID1 TP2 U1 VIN EN SC190 LX 10 1 L1 10uH 2 VOUT 4 TP3 TP4 TP5 TP6 5 6 7 MODE SYNC/PWM VID0 VOUT 3 BP pa d 1 9 C3 10uF C2 10uF 8 VID1 GND 8 7 6 5 DIP_SW 1 ON 1234 1 2 3 4 11 TP9 GND TP10 GND TP11 GND TP12 GND  2005 Semtech Corp. 15 www.semtech.com SC190 POWER MANAGEMENT Evaluation Board Gerber Plots Top Copper Bottom Copper Top Silkscreen Bottom Silkscreen  2005 Semtech Corp. 16 www.semtech.com SC190 POWER MANAGEMENT Outline Drawing - MLP-10 3x3 A E B DIMENSIONS INCHES MILLIMETERS DIM MIN NOM MAX MIN NOM MAX A A1 A2 b C D E e L N aaa bbb .031 .000 .007 .074 .042 .114 E PIN 1 INDICATOR (LASER MARK) (.008) .009 .079 .048 .118 .020 BSC .012 .016 10 .003 .004 .039 .002 .011 .083 .052 .122 .020 0.80 0.00 0.18 1.87 1.06 2.90 1.00 0.05 (0.20) 0.23 0.30 2.02 2.12 1.21 1.31 3.00 3.10 0.50 BSC 0.30 0.40 0.50 10 0.08 0.10 A aaa C C SEATING PLANE A1 A2 C 1 LxN 2 D N e bxN bbb CAB NOTES: 1. 2. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS TERMINALS. Marking Information 190n yyww xxxx yy = two digit year of manufacture ww = two digit week of manufacture xxxx = lot number "n" can be A, B, C, or D  2005 Semtech Corp. 17 www.semtech.com SC190 POWER MANAGEMENT Land Pattern - MLP-10 3x3 K DIMENSIONS DIM INCHES (.112) .075 .055 .087 .020 .012 .037 .150 MILLIMETERS (2.85) 1.90 1.40 2.20 0.50 0.30 0.95 3.80 (C) H G Z Y X P C G H K P X Y Z 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. 18 www.semtech.com