SEMTECH SC190

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