SC196A 1.5A Synchronous Buck Converter with Integrated Power Devices POWER MANAGEMENT Description Features The SC196A is a synchronous step-down converter with integrated power devices. The SC196A is designed for single-cell Li-Ion battery applications but can also be used in fixed 3.3V or 5V applications. The switching frequency is nominally set to 1MHz, allowing the use of small inductors and capacitors. The maximum current rating of the internal MOSFET switches allows a DC output current of 1.5A. Four programable output voltages 1.00V/1.05V/1.20V/ 1.80V are available. See SC196 with external feedback for other output voltage settings. The SC196A has a flexible clocking methodology that allows it to be synchronized to an external oscillator or controlled by the internal oscillator. The device can operate in either forced PWM mode or in PSAVE mode. If PSAVE mode is enabled, the part will automatically enter PFM at light loads to maintain maximum efficiency across the full load range. Up to 93% efficiency 1.00V/1.05V/1.20V/1.80V selectable output voltage Output current — 1.5A Quiescent current — 17μA Input range — 2.7V to 5.5V Dynamic voltage positioning capability Fixed 1MHz frequency or 750kHz to 1.25MHz synchronized operation PSAVE operation to maximize efficiency at light loads Minimal external components Fast transient response 100% duty cycle in dropout Soft-start Over-temperature and short-circuit protection Space-saving lead-free package — MLP-10, 3 x 3mm Applications For noise sensitive applications, PSAVE mode can be disabled by synchronizing to an external oscillator or pulling the SYNC/PWM pin high. Shutdown turns off all the control circuitry to achieve a typical shutdown current of 0.1μA. Cell phones Wireless communication chipset power Personal media player Notebook and sub-notebook computers PDAs and mobile communicators WLAN peripherals Typical Application Circuit L1 SC196A VIN 2.7V to 5.5V CIN 10μF July 14, 2008 VIN EN SYNC/PWM VID0 VID1 MODE VOUT 1.05V 1.5A LX 4.7μH VOUT PGND GND 1 COUT 10μF www.semtech.com SC196A PRELIMINARY 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 recommended. Parameter Symbol Maximum Units Input Supply Voltage VIN -0.3 to 7 V Logic Inputs (SYNC/PWM, EN, MODE, VID0, VID1) VN -0.3 to VIN+0.3, 7V Max V Output Voltage VOUT -0.3 to VIN+0.3, 7V Max V LX Voltage VLX -1 to VIN +1, -2V(100ns Max),7V Max V Thermal Impedance Junction to Ambient(1) θJA 40 °C/W VOUT Short-Circuit to GND tSC Continuous s Operating Ambient Temperature Range TA -40 to +85 °C Storage Temperature TS -60 to +150 °C Junction Temperature TJ -40 to +150 °C Peak IR Reflow Temperature TPKG 260 °C ESD Protection Level (2) VESD 2 kV Note: (1) Calculated from package in still air, mounted to 3” x 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards. (2) Tested according to JEDEC standard JESD22-A114-B. Electrical Characteristics Unless otherwise noted: VIN = 3.6V, EN = VIN, SYNC/PWM = VIN, MODE = VIN , TA = -40 to 85°C. Typical values are at TA = 25°C. Parameter Symbol Input Voltage Range VIN VOUT Accuracy VOUT VOUT Temperature Accuracy VOUT(T) Line Regulation Conditions Min Typ 2.7 IOUT = 0.75A, TA = 25°C Max Units 5.5 V ±1 % IOUT = 0.75A, TA = -40 to 85°C ±0.3 ±0.7 % VOUT LINE VIN = 2.7V to 5.5V, VOUT = 1.8V, IOUT = 0.75A, TA = -40 to 85°C ±0.4 ±0.65 % Load Regulation (PWM) VOUT LOAD IOUT = 0A to 1.5A, TA = -40 to 85°C ±0.3 ±0.65 % PSAVE Regulation VOUT PSAVE SYNC/PWM =GND, COUT=22 μF +1.3 -0.3 +1.6 -0.6 % P-Channel On Resistance RDSP ILX = 100mA 0.275 Ω N-Channel On Resistance RDSN ILX = 100mA 0.165 Ω Start-Up Time TSTART P-Channel Current Limit ILIM(P) © 2008 Semtech Corp. 1.9 2 5 ms 2.63 A www.semtech.com SC196A PRELIMINARY POWER MANAGEMENT Electrical Characteristics (Cont.) Parameter Symbol Conditions Quiescent Current IQ Shutdown Current Min Typ Max Units SYNC/PWM = GND, IOUT = 0A, VOUT = 1.04 x VOUT(Programmed) 17 28 μA ISD EN = GND, LX = OPEN 0.1 1 μA LX Leakage Current PMOS ILXP LX = GND, EN = GND 0.1 2 μA LX Leakage Current NMOS ILXN LX = 3.6V, EN = GND Oscillator Frequency -2 0.1 fOSC 0.85 1.0 SYNC Frequency (upper) fSYNCU 1.25 SYNC Frequency (lower) fSYNCL UVLO Threshold (upper) VUVL UVLO Hysteresis Thermal Shutdown Thermal Shutdown Hysteresis 2.38 1.15 MHz MHz 2.52 750 kHz 2.65 V VUVLHYS 135 mV TSD 145 °C TSD-HYS 10 °C Logic Input High VIH EN, SYNC/PWM, VID0, VID1, MODE Logic Input Low VIL EN, SYNC/PWM, VID0, VID1, MODE Logic Input Current High IIH EN, SYNC/PWM, VID0, VID1, MODE -2 Logic Input Current Low IIL EN, SYNC/PWM, VID0, VID1, MODE -2 © 2008 Semtech Corp. μA 3 1.2 V 0.4 V 0.1 2 μA 0.1 2 μA www.semtech.com SC196A PRELIMINARY POWER MANAGEMENT Ordering Information Pin Configuration VIN 1 10 LX MODE 2 9 PGND SYNC/PWM 3 8 GND EN 4 7 VID1 VOUT 5 6 VID0 TOP VIEW DEVICE PACKAGE SC196AMLTRT(1)(2) MLP 3x3-10 SC196AEVB Evaluation Board Ordering Information Notes: (1) Lead-free packaging only. This product is fully WEEE and RoHS compliant. (2) Available in tape and reel only. A reel contains 3000 devices. Programmable Output Voltage T MLP10: 3X3 10 LEAD VID1 VID0 SC196A VOUT 0 0 1.0V 0 1 1.05V 1 0 1.2V 1 1 1.8V Marking Information 196A yyww xxxx yy = two digit year of manufacture ww = two digit week of manufacture xxxx = lot number © 2008 Semtech Corp. 4 www.semtech.com SC196A PRELIMINARY POWER MANAGEMENT Block Diagram Plimit Amp 1 VIN 10 LX 9 PGND 8 GND Current Amp EN 4 SYNC /PWM 3 OSC & Slope Generator Control Logic PWM Comp 500mV Ref MODE 2 VID1 7 VID0 6 VOUT 5 © 2008 Semtech Corp. Error Amp PSAVE Comp Voltage Select 5 Nlimit Amp www.semtech.com SC196A PRELIMINARY POWER MANAGEMENT Pin Descriptions Pin # Pin Name 1 VIN 2 MODE 3 SYNC/PWM 4 EN 5 VOUT Regulated output voltage and feedback for SC196A 6 VID0 Logic level bit 0 used in conjunction with VID1 to set the output voltage. Connect high or low as required to select the desired output voltage. If not connected, the output voltage will be indeterminate. 7 VID1 Logic level bit 1 used in conjunction with VID0 to set the output voltage. Connect high or low as required to select the desired output voltage. If not connected, the output voltage will be indeterminate. 8 GND Ground 9 PGND 10 LX © 2008 Semtech Corp. Pin Function Input power supply voltage MODE select pin - MODE = VIN to select 100% duty cycle function; MODE = GND to disable 100% duty cycle capability. Oscillator synchronization input - Tie to VIN for forced PWM mode or GND to allow the part to enter PSAVE mode at light loads. Apply an external clock signal for frequency synchronization. Enable digital input - a high input enables the SC196A; a low disables and reduces quiescent current to less than 1μA. In shutdown, LX becomes high impedance. Power Ground Inductor connection to the switching FETs 6 www.semtech.com SC196A PRELIMINARY POWER MANAGEMENT Applications Information SC196A Detailed Description The SC196A is a synchronous step-down, Pulse Width Modulated (PWM), DC-DC converter utilizing a 1MHz fixed-frequency current mode architecture. The device is designed to operate in a fixed-frequency PWM mode across the full load range and can enter Power Save Mode (PSAVE), utilizing Pulse Frequency Modulation (PFM) at light loads to maximize efficiency. • Over-voltage protection • Soft-start Thermal Shutdown The device has a thermal shutdown feature to protect the SC196A if the junction temperature exceeds 145°C. In thermal shutdown, the on-chip power devices are disabled, tri-stating the LX output. Switching will resume when the temperature drops by 10°C. During this time, if the output voltage decreases by more than 60% of its programmed value, a soft-start will be invoked. Operation During normal operation, the PMOS is activated on each rising edge of the internal oscillator. Current feedback for the switching regulator uses the PMOS current path, and it is amplified and summed with the internal slope compensation network. The voltage feedback loop uses 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. Current Limit The PMOS and NMOS power devices of the buck switcher 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. This prevents the inductor current from "stair-casing". Over-Voltage Protection When the output voltage exceeds the regulation voltage by approximately 15% while operating in PWM mode, the PWM drive is disabled and the LX pin is tri-stated. Once the output voltage drops below the OVP voltage, the device will resume PWM mode control. In PSAVE mode, the PSAVE burst drive is disabled when the output voltage exceeds the regulation voltage by approximately 1.5% and the LX pin is tri-stated. The device will resume PSAVE burst switching when the output voltage has fallen below the regulation voltage by approximately 2%. The SC196A has an internal synchronous NMOS rectifier and does not require a Schottky diode on the LX pin. Programmable Output Voltage The SC196A has four pre-determined output voltage values which can be individually selected by the correct programming of the VID0 and VID1 pins (see Programmable Output Voltage table on Page 4). This eliminates the need for external programming resistors, saving PCB area and inventory. The VID pins can be statically tied to GND or VIN for fixed output configurations, or they may be driven by a microprocessor, enabling the possibility of dynamic voltage adjustment for host equipment "sleep" states. 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 startup. The PMOS current limit is stepped up through seven soft-start levels to the full value by a timer driven from the internal oscillator. During soft-start, the switching frequency is stepped by 1/8, 1/4, and 1/2 of the internal oscillator frequency up to the full value, under control of three output voltage thresholds. As soon as the output voltage is within 2% of the regulation voltage, soft-start mode is disabled. Continuous Conduction & Oscillator Synchronization The SC196A is designed to operate in continuous conduction, fixed-frequency mode. When the SYNC/PWM pin is tied high, the part runs in PWM mode using 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. Protection Features The SC196A provides the following protection features: • Thermal shutdown • Current limit © 2008 Semtech Corp. 7 www.semtech.com SC196A PRELIMINARY POWER MANAGEMENT Applications Information (Cont.) Power Save Mode Operation The PSAVE mode may be selected by tying the SYNC/ PWM pin to GND. Selecting PSAVE mode will enable the SC196A to automatically activate/deactivate operation at light loads, maximizing efficiency across the full load range. The SC196A automatically detects the load current at which it should enter PSAVE mode. The SC196A is optimized to track maximum efficiency with respect to VIN. In PSAVE mode, VOUT is driven from a lower level to an upper level by a switching burst. Once the upper level has been reached, the switching is stopped and the quiescent current is reduced. VOUT falls from the upper to lower levels in this low current state as the load current discharges the output capacitor. The burst-to-off period in PSAVE will decrease as the load current reduces. PSAVE levels are set high to minimize the undershoot when exiting PSAVE. The lower PSAVE comparator level is set +0.7% above VOUT, and the upper comparator level at +1.5% above VOUT with the exit threshold at -2% below VOUT. If PSAVE operation is required, then a 22μF output capacitor must be used. 100% Duty Cycle Operation The 100% duty cycle mode may be selected by connecting the MODE pin high. This will allow the SC196A to maintain output regulation under low input voltage/high output voltage conditions. In 100% duty cycle operation, as the input supply drops toward the output voltage, the PMOS on-time increases linearly above the maximum value in fixed-frequency operation until the PMOS is active continuously. Once the PMOS is switched on continuously, the output voltage tracks the input voltage minus the voltage drop across the PMOS power device and inductor according to the following relationship: The PSAVE switching burst frequency is controlled so that the inductor current ripple is similar to that in PWM mode. The minimum switching frequency during this period is limited to 650kHz. The SC196A automatically detects when to exit PSAVE mode by monitoring VOUT . For the SC196A to exit PSAVE mode, the load must be increased, causing VOUT to decrease until the power save exit threshold is reached. VOUT VIN IOUT u (RDSP RIND ) where, VOUT VIN IOUT RDSP RIND Power Save Operation BURST OFF = Output voltage = Input voltage = Output current = PMOS switch ON resistance = Series resistance of the inductor Minimum VIN for Fixed Frequency Operation Vs. RIND Higher Load Applied 3 1.5% 2.95 0.7% PSAVE Mode at Light Load PWM Mode at Medium/ High Load VOUT 2.9 VIN (V) -2% 2.85 2.8 Inductor Current 2.75 VOUT = 1.8V IOUT =1A 2.7 0.05 0A © 2008 Semtech Corp. 0.1 0.15 0.2 0.25 0.3 Inductor DC R esistance (Ω) Time 8 www.semtech.com SC196A PRELIMINARY POWER MANAGEMENT Applications Information (Cont.) Output voltage ripple is a combination of the voltage ripple from the charge - discharge cycle of the output capacitor and the voltage created by the inductor ripple current passing through the output capacitor ESR. Selecting an output capacitor with a low ESR will reduce the output voltage ripple component, as can be seen in the following equation: Inductor Selection The SC196A is designed for use with a 4.7μH inductor. The magnitude of the inductor current ripple is dependent on the inductor value and can be determined by the following equation: ' IL V OUT · V OUT §¨ 1 ¸ V IN ¹ © L u f OSC 'VOUT (ESR) 'IL (ripple ) u ESR( COUT ) This equation demonstrates the relationship between input voltage, output voltage, and inductor ripple current. Capacitors with X7R or X5R ceramic dielectric are strongly recommended for their low ESR and superior temperature and voltage characteristics. Y5V capacitors should not be used as their temperature coefficients make them unsuitable for this application. Table 2 lists the manufacturers of recommended capacitor options. The inductor should have a low DCR to minimize the conduction losses and maximize efficiency. 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, as shown by the following equation: 'IL ILPK IOUT (MAX ) 2 Table 1 — Recommended Inductors Final inductor selection will depend on various design considerations, such as efficiency, EMI, size and cost. Table 1 lists the manufacturers of practical inductor options. CIN Selection The source input current to a buck converter is noncontinuous. To prevent large input voltage ripple, a low ESR ceramic capacitor is required. A minimum value of 10μF should be used for sufficient input voltage filtering, and a 22μF should be used for improved input voltage filtering. Rated Current (A) Tolerance (%) Dimensions LxWxH (mm) BI Technologies HM66404R1 4.1 0.057 1.95 20 5.7 × 5.7 ×2.0 Coilcraft D01608C-472ML 4.7 0.09 1.5 20 6.6 × 4.5 × 3.0 TDK VLCF4020T- 4R7N1R2 4.7 0.098 1.24 30 4.0 × 4.0 × 2.0 Taiyo Yuden LMNP04SB4R7N 4.7 0.050 1.2 30 5.0 × 5.0 × 2.0 TOKO D52LC 4.7 0.087 1.14 20 5.0 × 5.0 × 2.0 Sumida CDRH3D16 4.7 0.050 1.2 30 3.8 × 3.8 × 1.8 Coilcraft LPS3015 4.7 0.2 1.1 20 3.0 × 3.0 × 1.5 Table 2 — Recommended Capacitors 1 2S L u COUT This single pole filter is designed to operate with a minimum output capacitor value of 10μF. Larger output capacitor values will improve transient performance. If PSAVE operation is required, the minimum capacitor value is 22μF. © 2008 Semtech Corp. DCR (Ω) Note: recommended Inductors do not necessarily guarantee rated performance of the part. COUT Selection The internal compensation is designed to work with a certain output filter corner frequency, which is defined by the equation: fC Value (μH) Manufacturer/Part # Manufacturer/Part # Value (μF) Rated Voltage (VDC) Temperature Characteristic Case Size Murata GRM21BR60J226ME39L 22 6.3 X5R 0805 Murata GRM188R60J106 MKE19 10 6.3 X5R 0603 TDK C2012X5R0J106K 10 6.3 X5R 0603 Note: Where PSAVE operation is required, 22μF must be used for COUT. 9 www.semtech.com SC196A PRELIMINARY POWER MANAGEMENT Applications Information (Cont.) PCB Layout Considerations Poor layout can degrade the performance of the DC-DC converter and can contribute to EMI problems, ground bounce, and resistive voltage losses. Poor regulation and instability can result. 2. Route the output voltage feedback path away from the inductor and LX node to minimize noise and magnetic interference. 3. Maximize ground metal on the component side to improve the return connection and thermal dissipation. Separation between the LX node and GND should be maintained to avoid coupling of switching noise to the ground plane. 4. Use a ground plane with several vias connecting to the component side ground to further reduce noise interference on sensitive circuit nodes. 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. GND VIN CIN LX SC196A COUT LOUT VOUT GND © 2008 Semtech Corp. 10 www.semtech.com SC196A PRELIMINARY POWER MANAGEMENT Typical Characteristics Efficiency vs. Load Current VOUT = 1.0V Efficiency vs. Load Current VOUT = 1.8V 100 100 90 90 80 80 VIN=4.2V PSAVE 60 VIN=2.7V PSAVE 70 VIN=3.6V PSAVE VIN=2.7V PSAVE Efficiency (%) Efficiency (%) 70 VIN=4.2V PWM 50 40 VIN=3.6V PWM 30 50 VIN=2.7V PWM VIN=3.6V PSAVE 60 VIN=4.2V PSAVE VIN=3.6V PWM 40 30 VIN=2.7V PWM VIN=4.2V PWM 20 20 10 10 0 0 0.0001 0.001 0.01 IOUT (A) 0.1 1 0.001 0.0001 Efficiency vs. Load Current VOUT = 1.2V 0.01 IOUT (A) 0.1 1 Efficiency vs. Input Voltage 100 100 90 95 80 VOUT=1.8V,PSAVE VIN=4.2V PSAVE 90 VIN=3.6V PSAVE Efficiency(%) Efficiency (%) 70 60 VOUT=1.8V,PWM VIN=2.7V PSAVE 50 VIN=4.2V PWM 40 80 VIN=3.6V PWM 30 85 VOUTt=1V,PSAVE VOUT=1V,PWM VIN=2.7V PWM 20 75 10 0 0.0001 0.001 0.01 IOUT (A) 0.1 70 2.5 1 3.0 3.5 4.0 5.0 4.5 5.5 Vin(V) IOUT=500 mA(PWM)/50 mA(PSAVE) PWM to PSAVE Hysteresis 95 PSAVE Exit for increasing IOUT PSAVE Entry for decreasing IOUT Efficiency (%) 90 PSAVE Mode IOUT increasing 85 PSAVE MODE IOUT decreasing PWM Mode 80 75 70 0.001 © 2008 Semtech Corp. 0.01 IOUT (A) 0.1 1 11 www.semtech.com SC196A PRELIMINARY POWER MANAGEMENT Typical Characteristics (Cont.) VOUT vs. IOUT, VOUT=1.8V, PWM VOUT vs. VIN 1.84 1.8025 1.8020 1.8015 VOUT=1.8V PSAVE IOUT=50mA 1.8010 1.8005 VOUT (V) VOUT (V) 1.83 1.82 1.8000 1.7995 VOUT=1.8V PWM IOUT=500mA 1.7990 1.81 1.7985 1.7980 1.80 2.5 1.7975 3.0 3.5 4.0 4.5 5.0 5.5 0.4 0.2 0 6.0 VOUT vs. Temperature VOUT=1.8V, PWM 22 1.8085 PSAVE Mode TA = 85 °C 20 Quiescent Current (μA) 1.8075 1.8070 Vout(V) 1.2 21 1.8080 1.8065 1.8060 1.8055 19 18 16 15 14 1.8045 13 1.8040 -50 -40 -30 -20 -10 0 10 20 TA(°C) 30 40 50 60 70 80 12 2.5 90 TA = 25 °C 17 1.8050 TA = 40 °C 3 3.5 4 VIN (V) 4.5 5 5.5 6 P-Channel RDSON vs. Input Voltage Quiescent Current vs. Input Voltage PWM Mode 0.40 TA = 85 °C TA = -40 °C 0.35 5.5 TA = 85 °C TA = 25 °C 0.30 5 TA = 25 °C R DSON (Ω) Quiescent Current (mA) 1 Quiescent Current vs. Input Voltage 1.8090 6 0.8 0.6 IOUT (A) VIN (V) 4.5 0.25 TA = -40 °C 4 0.20 3.5 0.15 3 2.5 3 © 2008 Semtech Corp. 3.5 4 VIN (V) 4.5 5 5.5 0.10 2.7 6 12 3.2 3.7 VIN (V) 4.2 4.7 5.2 www.semtech.com SC196A PRELIMINARY POWER MANAGEMENT Typical Characteristics (Cont.) N-Channel RDSON vs. Input Voltage Switching Frequency vs. Temperature 1050 0.22 VIN = 5.5V 1040 0.20 1030 Switching Frequency (kHz) TA = 85 °C R DSON (Ω) 0.18 TA = 25 °C 0.16 TA = -40 °C 0.14 VIN = 3.6V 1020 VIN = 2.7V 1010 1000 990 980 970 0.12 960 0.10 2.7 3.2 3.7 4.2 VIN (V) 4.7 950 -50 5.2 -30 -10 10 30 50 70 90 110 130 TJ = (°C) PSAVE Operation 100% Duty Cycle Mode VOUT (50mV/div) VOUT (20mV/div) ILOAD (1A/div) IL (200mA/div) VLX (5V/div) VLX (2V/div) Time (1us/div) Condition VIN=3.6V, VOUT=1.8V, lOUT=150mA, SYNC/PWM=GND Time (400ns/div) Condition VIN=2.6V, VOUT=1.8V, lOUT=1.4A, SYNC/PWM=1.15MHz ext clock PSAVE Start-up PWM Operation VOUT (10mV/div) EN (2V/div) IL (200mA/div) VOUT (1V/div) VLX (5V/div) lIN (100mA/div) Time (1us/div) Condition VIN=3.6V, VOUT=1.8V, lOUT=150mA, SYNC/PWM=VIN © 2008 Semtech Corp. Time (200us/div) Condition VIN=3.6V, VOUT=1.8V, lOUT=10mA, SYNC/PWM=GND 13 www.semtech.com SC196A PRELIMINARY POWER MANAGEMENT Typical Characteristics (Cont.) PWM Start-up Load Transient Response PWM EN (2V/div) VOUT (1V/div) VOUT (100mV/div) ILOAD (1A/div) lIN (100mA/div) Time (200us/div) Condition VIN=3.6V, VOUT=1.8V, lOUT=10mA, SYNC/PWM=VIN Time (100us/div) Condition VIN=3.6V, VOUT=1.8V, lOUT=1A to 100mA, SYNC/PWM=VIN Load Transient Response PSAVE VID Code Change VID0 (2V/div) VOUT (100mV/div) VOUT (200mV/div) ILOAD (1A/div) Time (100us/div) Condition VIN=3.6V, VOUT=1.8V, lOUT=1A to 100 mA, SYNC/PWM=GND © 2008 Semtech Corp. Time (400us/div) Condition VIN=3.6V, VOUT=1.8V to 1.5V, lOUT=1A, SYNC/PWM=VIN 14 www.semtech.com SC196A PRELIMINARY POWER MANAGEMENT Applications Circuits VOUT = 1.05V with PSAVE and 100% Duty Cycle VIN 2.7V to 5.5V L1 VIN EN CIN 10μ F SC196A VOUT 1.05V 1.5A LX 4. 7 μ H SYNC/PWM VOUT VID0 VID1 MODE PGND COUT 22μF GND Mobile Voltage Positioning for Reduced System Dissipation in "Sleep" Modes VIN 2.7V to 5.5V CIN 10μF Sleep Flag from uProc Changes voltage From 1.8V to 1.2V SC196A VIN EN SYNC/PWM VID0 VID1 MODE VOUT 1.8V norm L1 LX 4.7μH VOUT COUT PGND VOUT 1.2V sleep 22μF GND VOUT = 1.0V with Forced PWM and no 100% Duty Cycle VIN 2.7V to 5.5V CIN 10μF © 2008 Semtech Corp. SC196A VIN EN SYNC/PWM VID0 VID1 MODE 15 L1 LX VOUT PGND GND VOUT 1V 1.5A 4.7μH COUT 10μF www.semtech.com SC196A PRELIMINARY POWER MANAGEMENT Outline Drawing - MLP-10 A E DIMENSIONS INCHES MILLIMETERS DIM MIN NOM MAX MIN NOM MAX B A A1 A2 b C D E e L N aaa bbb E PIN 1 INDICATOR (LASER MARK) A aaa C A1 C 1 .039 .031 .002 .000 (.008) .007 .009 .011 .074 .079 .083 .042 .048 .052 .114 .118 .122 .020 BSC .012 .016 .020 10 .003 .004 0.80 1.00 0.00 0.05 (0.20) 0.18 0.23 0.30 1.87 2.02 2.12 1.06 1.21 1.31 2.90 3.00 3.10 0.50 BSC 0.30 0.40 0.50 10 0.08 0.10 SEATING PLANE C A2 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. © 2008 Semtech Corp. 16 www.semtech.com SC196A PRELIMINARY POWER MANAGEMENT Land Pattern - MLP-10 K DIM (C) H G DIMENSIONS INCHES MILLIMETERS C G H K P X Y Z Z Y X (.112) .075 .055 .087 .020 .012 .037 .150 (2.85) 1.90 1.40 2.20 0.50 0.30 0.95 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 www.semtech.com © 2008 Semtech Corp. 17 www.semtech.com