SEMTECH SC196A

SC196A 1.5A Synchronous Buck Converter with Integrated Power Devices POWER MANAGEMENT Description Features The SC196A is a synchronous step-down converter with ‹ Up to 93% efŢ ciency integrated power devices. The SC196A is designed for ‹ 1.00V/1.05V/1.20V/1.80V selectable output voltage single-cell Li-Ion battery applications but can also be used ‹ Output current — 1.5A in Ţ xed 3.3V or 5V applications. The switching frequency ‹ Quiescent current — 17μA is nominally set to 1MHz, allowing the use of small ‹ Input range — 2.7V to 5.5V inductors and capacitors. The maximum current rating of ‹ Dynamic voltage positioning capability the internal MOSFET switches allows a DC output current ‹ Fixed 1MHz frequency or 750kHz to 1.25MHz of 1.5A. synchronized operation ‹ PSAVE operation to maximize efŢ ciency at light loads ‹ Minimal external components Four programable output voltages 1.00V/1.05V/1.20V/ ‹ Fast transient response 1.80V are available. See SC196 with external feedback ‹ 100% duty cycle in dropout for other output voltage settings. ‹ Soft-start ‹ Over-temperature and short-circuit protection The SC196A has a ţ exible clocking methodology that ‹ Space-saving lead-free package — MLP-10, 3 x 3mm 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 Applications PSAVE mode is enabled, the part will automatically enter PFM at light loads to maintain maximum efŢ ciency across ‹ Cell phones the full load range. ‹ Wireless communication chipset power ‹ Personal media player For noise sensitive applications, PSAVE mode can be ‹ Notebook and sub-notebook computers ‹ PDAs and mobile communicators disabled by synchronizing to an external oscillator or ‹ WLAN peripherals pulling the SYNC/PWM pin high. Shutdown turns off all the control circuitry to achieve a typical shutdown current of 0.1μA. Typical Application Circuit L1 SC196A V OUT VIN LX V 1.05V IN EN 4.7μH 2.7V to 5.5V 1.5A SYNC/PWM VOUT C C IN OUT VID0 VID1 PGND 10μF 10μF MODE GND July 14, 2008 www.semtech.com 1 SC196A PRELIMINARY POWER MANAGEMENT Absolute Maximum Ratings Exceeding the speciŢ cations below may result in permanent damage to the device or device malfunction. Operation outside of the parameters speciŢ ed in the Electrical Characteristics section is not recommended. Parameter Symbol Maximum Units Input Supply Voltage V -0.3 to 7 V IN Logic Inputs V -0.3 to V +0.3, 7V Max V N IN (SYNC/PWM, EN, MODE, VID0, VID1) Output Voltage V -0.3 to V +0.3, 7V Max V OUT IN LX Voltage V -1 to V +1, -2V(100ns Max),7V Max V LX IN (1) Thermal Impedance Junction to Ambient θ 40 °C/W JA VOUT Short-Circuit to GND t Continuous s SC Operating Ambient Temperature Range T -40 to +85 °C A Storage Temperature T -60 to +150 °C S Junction Temperature T -40 to +150 °C J Peak IR Reţ ow Temperature T 260 °C PKG (2) ESD Protection Level V 2kV ESD 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: V = 3.6V, EN = V , SYNC/PWM = V , MODE = V , T = -40 to 85°C. Typical values are at T = 25°C. IN IN IN IN A A Parameter Symbol Conditions Min Typ Max Units Input Voltage Range V 2.7 5.5 V IN VOUT Accuracy V I = 0.75A, T = 25°C ±1 % OUT OUT A VOUT Temperature Accuracy V I = 0.75A, T = -40 to 85°C ±0.3 ±0.7 % OUT(T) OUT A V = 2.7V to 5.5V, V = 1.8V, IN OUT Line Regulation V ±0.4 ±0.65 % OUT LINE I = 0.75A, T = -40 to 85°C OUT A Load Regulation (PWM) V I = 0A to 1.5A, T = -40 to 85°C ±0.3 ±0.65 % OUT LOAD OUT A +1.3 +1.6 PSAVE Regulation V SYNC/PWM =GND, C =22 μF % OUT PSAVE OUT -0.3 -0.6 P-Channel On Resistance R I = 100mA 0.275 Ω DSP LX N-Channel On Resistance R I = 100mA 0.165 Ω DSN LX Start-Up Time T 5ms START P-Channel Current Limit I 1.9 2.63 A LIM(P) © 2008 Semtech Corp. www.semtech.com 2 SC196A PRELIMINARY POWER MANAGEMENT Electrical Characteristics (Cont.) Parameter Symbol Conditions Min Typ Max Units SYNC/PWM = GND, I = 0A, OUT Quiescent Current I 17 28 μA Q V = 1.04 x V OUT OUT(Programmed) Shutdown Current I EN = GND, LX = OPEN 0.1 1 μA SD LX Leakage Current PMOS I LX = GND, EN = GND 0.1 2 μA LXP LX Leakage Current NMOS I LX = 3.6V, EN = GND -2 0.1 μA LXN Oscillator Frequency f 0.85 1.0 1.15 MHz OSC SYNC Frequency (upper) f 1.25 MHz SYNCU SYNC Frequency (lower) f 750 kHz SYNCL UVLO Threshold (upper) V 2.38 2.52 2.65 V UVL UVLO Hysteresis V 135 mV UVLHYS Thermal Shutdown T 145 °C SD Thermal Shutdown Hysteresis T 10 °C SD-HYS Logic Input High V EN, SYNC/PWM, VID0, VID1, MODE 1.2 V IH Logic Input Low V EN, SYNC/PWM, VID0, VID1, MODE 0.4 V IL Logic Input Current High I EN, SYNC/PWM, VID0, VID1, MODE -2 0.1 2 μA IH Logic Input Current Low I EN, SYNC/PWM, VID0, VID1, MODE -2 0.1 2 μA IL © 2008 Semtech Corp. www.semtech.com 3 SC196A PRELIMINARY POWER MANAGEMENT Ordering Information Pin ConŢ guration DEVICE PACKAGE (1)(2) SC196AMLTRT MLP 3x3-10 SC196AEVB Evaluation Board Ordering Information VIN 1 10 LX Notes: (1) Lead-free packaging only. This product is fully WEEE and RoHS TOP VIEW compliant. MODE 2 9 PGND (2) Available in tape and reel only. A reel contains 3000 devices. 3 8 GND SYNC/PWM EN 4 7 VID1 Programmable Output Voltage T 56 VID0 VOUT VID1 VID0 SC196A V OUT 0 0 1.0V MLP10: 3X3 10 LEAD 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. www.semtech.com 4 SC196A PRELIMINARY POWER MANAGEMENT Block Diagram Plimit Amp 1 VIN Current Amp EN 4 SYNC OSC & Slope 3 /PWM Generator Control 10 LX Logic PWM Comp 500mV Error Amp PSAVE Ref Comp Nlimit Amp 9 PGND 2 MODE VID1 7 Voltage Select 8 GND VID0 6 VOUT 5 © 2008 Semtech Corp. www.semtech.com 5 SC196A PRELIMINARY POWER MANAGEMENT Pin Descriptions Pin # Pin Name Pin Function 1 VIN Input power supply voltage 2 MODE MODE select pin - MODE = V to select 100% duty cycle function; MODE = GND to disable 100% duty IN cycle capability. Oscillator synchronization input - Tie to V for forced PWM mode or GND to allow the part to enter PSAVE IN 3 SYNC/PWM 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 4EN less than 1μA. In shutdown, LX becomes high impedance. 5 VOUT Regulated output voltage and feedback for SC196A Logic level bit 0 used in conjunction with VID1 to set the output voltage. Connect high or low as required 6 VID0 to select the desired output voltage. If not connected, the output voltage will be indeterminate. Logic level bit 1 used in conjunction with VID0 to set the output voltage. Connect high or low as required 7 VID1 to select the desired output voltage. If not connected, the output voltage will be indeterminate. 8 GND Ground 9 PGND Power Ground 10 LX Inductor connection to the switching FETs © 2008 Semtech Corp. www.semtech.com 6 SC196A PRELIMINARY POWER MANAGEMENT Applications Information SC196A Detailed Description • Over-voltage protection The SC196A is a synchronous step-down, Pulse Width • Soft-start Modulated (PWM), DC-DC converter utilizing a 1MHz Ţ xed-frequency current mode architecture. The device Thermal Shutdown is designed to operate in a Ţ xed-frequency PWM mode The device has a thermal shutdown feature to protect across the full load range and can enter Power Save Mode the SC196A if the junction temperature exceeds 145°C. (PSAVE), utilizing Pulse Frequency Modulation (PFM) at In thermal shutdown, the on-chip power devices are light loads to maximize efŢ ciency. disabled, tri-stating the LX output. Switching will resume when the temperature drops by 10°C. During this time, Operation if the output voltage decreases by more than 60% of its During normal operation, the PMOS is activated on each programmed value, a soft-start will be invoked. rising edge of the internal oscillator. Current feedback for the switching regulator uses the PMOS current path, Current Limit and it is ampliŢ ed and summed with the internal slope The PMOS and NMOS power devices of the buck switcher compensation network. The voltage feedback loop uses are protected by current limit functions. In the case of a an internal feedback divider. The on-time is determined by short to ground on the output, the part enters frequency comparing the summed current feedback and the output foldback mode, which causes the switching frequency to of the error ampliŢ er. The period is set by the onboard divide by a factor determined by the output voltage. This oscillator or by an external clock attached to the SYNC/ prevents the inductor current from "stair-casing". PWM pin. Over-Voltage Protection The SC196A has an internal synchronous NMOS rectiŢ er When the output voltage exceeds the regulation voltage and does not require a Schottky diode on the LX pin. by approximately 15% while operating in PWM mode, the PWM drive is disabled and the LX pin is tri-stated. Once Programmable Output Voltage the output voltage drops below the OVP voltage, the The SC196A has four pre-determined output voltage device will resume PWM mode control. In PSAVE mode, values which can be individually selected by the correct the PSAVE burst drive is disabled when the output voltage programming of the VID0 and VID1 pins (see Programmable exceeds the regulation voltage by approximately 1.5% Output Voltage table on Page 4). This eliminates the need and the LX pin is tri-stated. The device will resume PSAVE for external programming resistors, saving PCB area and burst switching when the output voltage has fallen below inventory. The VID pins can be statically tied to GND or the regulation voltage by approximately 2%. VIN for Ţ xed output conŢ gurations, or they may be driven by a microprocessor, enabling the possibility of dynamic Soft-Start voltage adjustment for host equipment "sleep" states. The soft-start mode is enabled after every shutdown cycle to limit in-rush current. In conjunction with the frequency Continuous Conduction & Oscillator Synchronization foldback, this controls the maximum current during start- The SC196A is designed to operate in continuous up. The PMOS current limit is stepped up through seven conduction, Ţ xed-frequency mode. When the SYNC/PWM soft-start levels to the full value by a timer driven from pin is tied high, the part runs in PWM mode using the the internal oscillator. During soft-start, the switching internal oscillator. The part can be synchronized to an frequency is stepped by 1/8, 1/4, and 1/2 of the internal external clock by driving a clock signal into the SYNC/ oscillator frequency up to the full value, under control of PWM pin. The part synchronizes to the rising edge of the three output voltage thresholds. As soon as the output clock. voltage is within 2% of the regulation voltage, soft-start mode is disabled. Protection Features The SC196A provides the following protection features: • Thermal shutdown • Current limit © 2008 Semtech Corp. www.semtech.com 7 SC196A PRELIMINARY POWER MANAGEMENT Applications Information (Cont.) Power Save Mode Operation PSAVE levels are set high to minimize the undershoot The PSAVE mode may be selected by tying the SYNC/ when exiting PSAVE. The lower PSAVE comparator level PWM pin to GND. Selecting PSAVE mode will enable the is set +0.7% above V , and the upper comparator level OUT SC196A to automatically activate/deactivate operation at +1.5% above V with the exit threshold at -2% below OUT at light loads, maximizing efŢ ciency across the full load V . OUT range. The SC196A automatically detects the load current at which it should enter PSAVE mode. The SC196A is If PSAVE operation is required, then a 22μF output optimized to track maximum efŢ ciency with respect to capacitor must be used. V . IN In PSAVE mode, V is driven from a lower level to an 100% Duty Cycle Operation OUT upper level by a switching burst. Once the upper level has The 100% duty cycle mode may be selected by connecting been reached, the switching is stopped and the quiescent the MODE pin high. This will allow the SC196A to maintain current is reduced. V falls from the upper to lower levels output regulation under low input voltage/high output OUT in this low current state as the load current discharges voltage conditions. the output capacitor. The burst-to-off period in PSAVE will decrease as the load current reduces. In 100% duty cycle operation, as the input supply drops toward the output voltage, the PMOS on-time increases The PSAVE switching burst frequency is controlled so that linearly above the maximum value in Ţ xed-frequency the inductor current ripple is similar to that in PWM mode. operation until the PMOS is active continuously. Once The minimum switching frequency during this period is the PMOS is switched on continuously, the output voltage limited to 650kHz. tracks the input voltage minus the voltage drop across the PMOS power device and inductor according to the The SC196A automatically detects when to exit PSAVE following relationship: mode by monitoring V . For the SC196A to exit PSAVE OUT V V V V II uu(R (R  R R ) ) mode, the load must be increased, causing V to OUT OUT IN IN OUT OUT DSP DSP IND IND OUT decrease until the power save exit threshold is reached. where, V = Output voltage OUT V = Input voltage IN I = Output current OUT R = PMOS switch ON resistance DSP R = Series resistance of the inductor IND Power Save Operation Higher Load Minimum V for Fixed Frequency Operation Vs. R IN IND Applied BURST OFF 3 1.5% 2.95 0.7% PSAVE Mode at Light Load PWM Mode at Medium/ High Load 2.9 V OUT -2% 2.85 2.8 Inductor Current 2.75 V = 1.8V OUT I =1A OUT 2.7 0.05 0.1 0.15 0.2 0.25 0.3 0 A Inductor DC Resistance (Ω) Time © 2008 Semtech Corp. www.semtech.com 8 V (V) IN SC196A PRELIMINARY POWER MANAGEMENT Applications Information (Cont.) Output voltage ripple is a combination of the voltage ripple Inductor Selection from the charge - discharge cycle of the output capacitor The SC196A is designed for use with a 4.7μH inductor. and the voltage created by the inductor ripple current The magnitude of the inductor current ripple is dependent passing through the output capacitor ESR. Selecting an on the inductor value and can be determined by the output capacitor with a low ESR will reduce the output following equation: voltage ripple component, as can be seen in the following V OUT § · equation: V OUT 1  ¨ ¸ V I N © ¹ ' I L L u f OSC 'VOUT(ESR) 'IL(ripple)uESR(COUT) This equation demonstrates the relationship between Capacitors with X7R or X5R ceramic dielectric are input voltage, output voltage, and inductor ripple current. strongly recommended for their low ESR and superior temperature and voltage characteristics. Y5V capacitors The inductor should have a low DCR to minimize the should not be used as their temperature coefŢ cients conduction losses and maximize efŢ ciency. As a minimum make them unsuitable for this application. Table 2 lists requirement, the DC current rating of the inductor the manufacturers of recommended capacitor options. should be equal to the maximum load current plus half of the inductor current ripple, as shown by the following Table 1 — Recommended Inductors equation: 'IL ILPK IOUT(MAX) Rated Dimensions Value DCR Tolerance Manufacturer/Part # Current LxWxH 2 (μH) (Ω) (%) (A) (mm) Final inductor selection will depend on various design BI Technologies 4.1 0.057 1.95 20 5.7 × 5.7 ×2.0 HM66404R1 considerations, such as efŢ ciency, EMI, size and cost. Coilcraft Table 1 lists the manufacturers of practical inductor 4.7 0.09 1.5 20 6.6 × 4.5 × 3.0 D01608C-472ML options. TDK 4.7 0.098 1.24 30 4.0 × 4.0 × 2.0 VLCF4020T- 4R7N1R2 Taiyo Yuden 4.7 0.050 1.2 30 5.0 × 5.0 × 2.0 LMNP04SB4R7N C Selection IN The source input current to a buck converter is non- TOKO 4.7 0.087 1.14 20 5.0 × 5.0 × 2.0 D52LC continuous. To prevent large input voltage ripple, a low Sumida ESR ceramic capacitor is required. A minimum value of 4.7 0.050 1.2 30 3.8 × 3.8 × 1.8 CDRH3D16 10μF should be used for sufŢ cient input voltage Ţ ltering, Coilcraft 4.7 0.2 1.1 20 3.0 × 3.0 × 1.5 LPS3015 and a 22μF should be used for improved input voltage Ţ ltering. Note: recommended Inductors do not necessarily guarantee rated perfor- mance of the part. C Selection OUT Table 2 — Recommended Capacitors The internal compensation is designed to work with a certain output Ţ lter corner frequency, which is deŢ ned by Rated Value Temperature Manufacturer/Part # Voltage Case Size the equation: (μF) Characteristic (VDC) 1 fC Murata 22 6.3 X5R 0805 2S Lu COUT GRM21BR60J226ME39L Murata GRM188R60J106 10 6.3 X5R 0603 This single pole Ţ lter is designed to operate with a MKE19 minimum output capacitor value of 10μF. Larger output TDK capacitor values will improve transient performance. 10 6.3 X5R 0603 C2012X5R0J106K If PSAVE operation is required, the minimum capacitor Note: Where PSAVE operation is required, 22μF must be used for C . OUT value is 22μF. © 2008 Semtech Corp. www.semtech.com 9 SC196A PRELIMINARY POWER MANAGEMENT Applications Information (Cont.) PCB Layout Considerations 2. Route the output voltage feedback path away from the Poor layout can degrade the performance of the DC-DC inductor and LX node to minimize noise and magnetic converter and can contribute to EMI problems, ground interference. bounce, and resistive voltage losses. Poor regulation and instability can result. 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 A few simple design rules can be implemented to ensure maintained to avoid coupling of switching noise to the good layout: ground plane. 1. Place the inductor and Ţ lter capacitors as close to the 4. Use a ground plane with several vias connecting to device as possible and use short wide traces between the component side ground to further reduce noise interference on sensitive circuit nodes. the power components. GND C IN V IN LX SC196A L OUT C OUT V OUT GND © 2008 Semtech Corp. www.semtech.com 10 SC196A PRELIMINARY POWER MANAGEMENT Typical Characteristics EfŢ ciency vs. Load Current V = 1.0V EfŢ ciency vs. Load Current V = 1.8V OUT OUT 100 100 90 90 80 80 V =4.2V PSAVE IN V =2.7V PSAVE IN 70 70 VIN=3.6V PSAVE VIN=2.7V PWM V =3.6V PSAVE IN 60 60 V =2.7V PSAVE V =4.2V PWM IN IN 50 50 V =4.2V PSAVE V =3.6V PWM IN IN 40 VIN=3.6V PWM 40 30 30 VIN=2.7V PWM V =4.2V PWM IN 20 20 10 10 0 0 0.0001 0.001 0.01 0.1 1 0.0001 0.001 0.01 0.1 1 I (A) OUT IOUT (A) EfŢ ciency vs. Load Current V = 1.2V EfŢ ciency vs. Input Voltage OUT 100 100 90 V =1.8V,PWM 95 OUT 80 VOUT=1.8V,PSAVE V =4.2V PSAVE 70 IN 90 VIN=3.6V PSAVE 60 VIN=2.7V PSAVE 85 50 VIN=4.2V PWM 40 80 VIN=3.6V PWM 30 VOUTt=1V,PSAVE VOUT=1V,PWM V =2.7V PWM IN 20 75 10 70 0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.0001 0.001 0.01 0.1 1 I (A) OUT Vin(V) I =500 mA(PWM)/50 mA(PSAVE) OUT PWM to PSAVE Hysteresis 95 PSAVE Exit for increasing IOUT PSAVE Entry for decreasing IOUT 90 PSAVE Mode I increasing OUT 85 PSAVE MODE I decreasing OUT PWM Mode 80 75 70 0.001 0.01 0.1 1 IOUT (A) © 2008 Semtech Corp. www.semtech.com 11 Efficiency (%) Efficiency (%) Efficiency (%) Efficiency(%) Efficiency (%) SC196A PRELIMINARY POWER MANAGEMENT Typical Characteristics (Cont.) V vs. V V vs. I , V =1.8V, PWM OUT OUT OUT OUT IN 1.84 1.8025 1.8020 1.8015 1.83 V =1.8V PSAVE OUT 1.8010 IOUT=50mA 1.8005 1.82 1.8000 1.7995 VOUT=1.8V PWM IOUT=500mA 1.7990 1.81 1.7985 1.7980 1.80 1.7975 0.2 0.4 0.6 0.8 11.2 0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 I (A) OUT V (V) IN V vs. Temperature OUT Quiescent Current vs. Input Voltage V =1.8V, PWM OUT 1.8090 PSAVE Mode 22 1.8085 21 TA = 85 °C 1.8080 20 1.8075 19 1.8070 18 TA = 25 °C 1.8065 17 1.8060 16 1.8055 15 1.8050 T = 40 °C 14 A 1.8045 13 1.8040 12 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 2.5 3 3.5 4 4.5 5 5.5 6 ° V (V) T ( C) IN A Quiescent Current vs. Input Voltage P-Channel R vs. Input Voltage DSON PWM Mode 0.40 6 T = 85 °C A TA = -40 °C 0.35 5.5 TA = 85 °C TA = 25 °C 0.30 5 TA = 25 °C 0.25 4.5 TA = -40 °C 0.20 4 0.15 3.5 0.10 3 2.7 3.2 3.7 4.2 4.7 5.2 2.5 3 3.5 4 4.5 5 5.5 6 VIN (V) V (V) IN © 2008 Semtech Corp. www.semtech.com 12 Vout(V) V (V) OUT Quiescent Current (mA) R DSON (Ω) V (V) OUT Quiescent Current (μA) SC196A PRELIMINARY POWER MANAGEMENT Typical Characteristics (Cont.) N-Channel R vs. Input Voltage Switching Frequency vs. Temperature DSON 0.22 1050 VIN = 5.5V 1040 VIN = 3.6V 0.20 1030 TA = 85 °C 1020 VIN = 2.7V 0.18 1010 TA = 25 °C 1000 0.16 990 TA = -40 °C 0.14 980 970 0.12 960 0.10 950 -50 -30 -10 10 30 50 70 90 110 130 2.7 3.2 3.7 4.2 5.2 4.7 VIN (V) TJ = (°C) PSAVE Operation 100% Duty Cycle Mode V (50mV/div) OUT V (20mV/div) OUT I (1A/div) LOAD I (200mA/div) L V (5V/div) V (2V/div) LX LX Time (400ns/div) Time (1us/div) Condition V =3.6V, V =1.8V, l =150mA, Condition V =2.6V, V =1.8V, l =1.4A, IN OUT OUT IN OUT OUT SYNC/PWM=1.15MHz ext clock SYNC/PWM=GND PWM Operation PSAVE Start-up EN (2V/div) V (10mV/div) OUT V (1V/div) OUT I (200mA/div) L V (5V/div) LX l (100mA/div) IN Time (1us/div) Time (200us/div) Condition V =3.6V, V =1.8V, l =150mA, IN OUT OUT Condition V =3.6V, V =1.8V, l =10mA, IN OUT OUT SYNC/PWM=V IN SYNC/PWM=GND © 2008 Semtech Corp. www.semtech.com 13 R (Ω) DSON Switching Frequency (kHz) SC196A PRELIMINARY POWER MANAGEMENT Typical Characteristics (Cont.) PWM Start-up Load Transient Response PWM EN (2V/div) V (1V/div) OUT V (100mV/div) OUT I (1A/div) l (100mA/div) LOAD IN Time (100us/div) Time (200us/div) Condition V =3.6V, V =1.8V, l =1A to 100mA, Condition V =3.6V, V =1.8V, l =10mA, IN OUT OUT IN OUT OUT SYNC/PWM=V SYNC/PWM=V IN IN Load Transient Response PSAVE VID Code Change VID0 (2V/div) V (100mV/div) OUT V (200mV/div) OUT I (1A/div) LOAD Time (100us/div) Time (400us/div) Condition V =3.6V, V =1.8V, l =1A to 100 mA, Condition V =3.6V, V =1.8V to 1.5V, l =1A, IN OUT OUT IN OUT OUT SYNC/PWM=GND SYNC/PWM=V IN © 2008 Semtech Corp. www.semtech.com 14 SC196A PRELIMINARY POWER MANAGEMENT Applications Circuits V = 1.05V with PSAVE and 100% Duty Cycle OUT V IN L1 2.7V to 5.5V V OUT SC196A VIN 1.05V LX 1.5A 4.7μH EN VOUT SYNC/PWM C C IN OUT VID0 VID1 PGND 22μF 10μF MODE GND Mobile Voltage Positioning for Reduced System Dissipation in "Sleep" Modes V IN 2.7V to 5.5V V OUT 1.8V norm L1 SC196A C IN VIN LX 10μF 4.7μH EN V OUT VOUT SYNC/PWM C 1.2V OUT VID0 sleep Sleep Flag from uProc PGND VID1 22μF Changes voltage MODE GND From 1.8V to 1.2V V = 1.0V with Forced PWM and no 100% Duty Cycle OUT SC196A L1 V OUT VIN LX V 1V IN EN 4.7μH 2.7V to 5.5V 1.5A C SYNC/PWM VOUT IN C OUT VID0 10μF PGND VID1 10μF MODE GND © 2008 Semtech Corp. www.semtech.com 15 SC196A PRELIMINARY POWER MANAGEMENT Outline Drawing - MLP-10 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 - - - - (.008) (0.20) A2 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 E .114 .118 .122 2.90 3.00 3.10 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 bxN e 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. www.semtech.com 16 SC196A PRELIMINARY POWER MANAGEMENT Land Pattern - MLP-10 DIMENSIONS K 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 X .012 0.30 Y 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 www.semtech.com © 2008 Semtech Corp. www.semtech.com 17