SGM6600-ADJYN6G/TR

Preliminary Datasheet SGM6600 90% Efficient Synchronous Step-Up Converter with 1.2A Switch GENERAL DESCRIPTION FEATURES The SGM6600 is a 1.2MHz, constant frequency, current mode, synchronous, step-up switching regulator. Its Output currents can go as high as 75mA while using a single-cell alkaline, and discharge it down to 0.9V. It can also be used for generating 5V at 300mA from a 3.3V rail or a Li-ion battery. ● 90% Efficient Synchronous Boost Converter 75mA Output Current at 3.3V from 0.9V Input 150mA Output Current at 3.3V from 1.8V Input ● Device Quiescent Current: 200µA (TYP) ● Lower than 1µA in Shutdown Status ● ● ● ● High switching frequency minimizes the sizes of inductor and capacitor. Integrated power MOSFETs and internal compensation make the SGM6600 simple to use and fit the total solution in a compact space. ● ● ● ● For light load current, the SGM6600 enters into the power saving mode to maintain high efficiency. Antiringing control circuitry reduces EMI concerns by damping the inductor in discontinuous mode. The SGM6600 provides true output disconnect and this allows VOUT to go to zero volts during shutdown without drawing any current from the input source. Input Voltage Range: 0.9V to 5.5V 3.3V and 5.0V Fixed Output Voltage Adjustable Output Voltage Up to 5.5V Power-Save Mode Version Available for Improved Efficiency at Low Output Power Load Disconnect During Shutdown Over Temperature Protection Available in Green SOT-23-6L Package -40℃ to +85℃ Operating Temperature Range APPLICATIONS Single-Cell Li Battery Powered Products The output voltage of SGM6600-ADJ can be programmed by an external resistor divider, and that of SGM6600-3.3/SGM6600-5.0 are fixed internally on the chip. The device is available in SOT-23-6L package. It operated over an ambient temperature range of -40℃ to Portable Audio Players Cellular Phones Personal Medical Products +85℃. TYPICAL APPLICATION L1 4.7µH 1 6 Power Supply SW VOUT VCC R1 SGM6600 C1 10µF 3 5 FB EN C2 22µF Output voltage can be adjusted 4 R2 GND 2 SG Micro Limited www.sg-micro.com July 09, 2010 90% Efficient Synchronous Step-Up Converter with 1.2A Switch SGM6600 PACKAGE/ORDERING INFORMATION MODEL SGM6600 VOUT(V) PINPACKAGE SPECIFIED TEMPERATURE RANGE ORDERING NUMBER PACKAGE MARKING PACKAGE OPTION Adjustable SOT-23-6L -40℃ to +85℃ SGM6600-ADJYN6G/TR S44XX Tape and Reel, 3000 3.3V SOT-23-6L -40℃ to +85℃ SGM6600-3.3YN6G/TR S45XX Tape and Reel, 3000 -40℃ to +85℃ SGM6600-5.0YN6G/TR S46XX Tape and Reel, 3000 5.0V SOT-23-6L NOTE: Order number and package marking are defined as the follow: MARKING INFORMATION SYY X X ORDER NUMBER SGM6600-X X X G / TR Tape and Reel Date code - Month ("A" = Jan. "B" = Feb. … "L" = Dec.) Green Product Date code - Year ("9" = 2009, "A" = 2010 …) Package Type Chip I.D. N6 SOT-23-6L For example: S449A (2009, January) Operating Temperature Range Y -40℃ to +85℃ Output Voltage 3.3 5.0 ADJ 3.3V 5.0V Adjustable ABSOLUTE MAXIMUM RATINGS CAUTION Input Supply Voltage on SW, VOUT, VCC, FB .................................................................................-0.3V to 6V EN Voltage............................................. -0.3V to (VOUT + 0.3V) Operating Temperature Range..........................-40℃ to +85℃ This integrated circuit can be damaged by ESD if you don’t pay attention to ESD protection. SGMICRO recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. Junction Temperature......................................................150℃ Package Thermal Resistance SOT-23-6L, θJA……………….…….……...….………....250℃/W Storage Temperature......................................-65℃ to +150℃ Lead Temperature (soldering, 10s) ................................260℃ ESD Susceptibility HBM................................................................................4000V MM.....................................................................................200V SGMICRO reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. Please contact SGMICRO sales office to get the last datashee NOTE: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. SG Micro Limited www.sg-micro.com 2 90% Efficient Synchronous Step-Up Converter with 1.2A Switch SGM6600 PIN CONFIGURATIONS (Top View) SGM6600-3.3/5.0 GND 2 EN 3 6 VCC 5 VOUT 4 NC SW 1 GND 2 EN 3 SOT-23-6L SYYxx 1 SYYxx SW SGM6600-ADJ 6 VCC 5 VOUT 4 FB SOT-23-6L NOTE: The location of pin 1 on the SGM6600 is determined by orienting the package marking as shown. PIN DESCRIPTION PIN NAME 1 SW 2 GND 3 EN Enable Input. (1/VCC enabled, 0/GND disabled) NC No Connect. It should be floating. (SGM6600-3.3/SGM6600-5.0) FB Output Voltage Feedback Pin. Voltage feedback for programming the output voltage. (SGM6600-ADJ) 4 5 VOUT 6 VCC FUNCTION Boost and rectifying switch input. Ground Boost Converter Output. Boost Converter Supply Voltage. SG Micro Limited www.sg-micro.com 3 90% Efficient Synchronous Step-Up Converter with 1.2A Switch SGM6600 ELECTRICAL CHARACTERISTICS (Typical values are at TA = +25℃, Full = -40℃ to +85℃, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 5.5 V DC/DC STAGE Output Voltage Range VOUT 2.5 Minimum Input Voltage Range for Start-Up VIN RL = 270Ω Input Voltage Range after Start-Up VIN TA = +25℃ Feedback Voltage VFB 1.1 0.9 V 5.5 500 mV Oscillator Frequency f 900 1200 1400 kHz Switch Current Limit ISW 950 1200 1900 mA Start-up Current Limit 240 mA Boost Switch-On Resistance VOUT = 3.3V 480 mΩ Rectifying Switch-On Resistance VOUT = 3.3V 600 mΩ Total Accuracy (including line and load regulation) 5 % Line Regulation 1 % Load Regulation VCC Quiescent Current 1 % 0.1 1 µA 235 µA VOUT IO = 0mA, VEN = VCC = 1.2V, VOUT = 3.3V, TA = +25℃ 200 VOUT VOUT = 5.0V, TA = +25℃ 230 VEN = 0V, VCC = 1.2V, TA = +25℃ 0.1 Shutdown Current µA 1 µA CONTROL STAGE 0.9V ≤ VCC ≤ 1.8V EN Input Low Voltage EN Input High Voltage EN Input Current VIL VIH 0.2×VCC 1.8V < VCC ≤ 3 .3V 0.6 3.3V < VCC ≤ 4.2V 0.6 4.2V < VCC ≤ 5.0V 0.6 0.9V ≤ VCC ≤ 1.8V 1.5 1.8V < VCC ≤ 3 .3V 2.0 3.3V < VCC ≤ 4.2V 2.4 4.2V < VCC ≤ 5.0V 2.6 Clamped on GND or VCC V V 0.01 0.05 µA Overtemperature Protection 150 ℃ Overtemperature Hysteresis 20 ℃ SG Micro Limited www.sg-micro.com 4 90% Efficient Synchronous Step-Up Converter with 1.2A Switch SGM6600 TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs. Output Current Efficiency vs. Output Current 100 100 80 VCC = 1.8V Efficiency (%) Efficiency (%) 80 60 40 VCC = 1.2V 20 VCC = 0.9V 0 0.01 0.1 100 60 VCC = 1.2V 40 20 VOUT = 2.5V 1 10 Output Current (mA) VCC = 2.4V VCC = 0.9V 0 0.01 1000 0.1 Efficiency vs. Output Current 100 1000 100 VCC = 2.4V 40 IO = 50mA 90 Efficiency (%) 60 IO = 100mA 95 VCC = 3.6V 80 Efficiency (%) 1 10 Output Current (mA) Efficiency vs. Input Voltage 100 VCC =1.8V 20 85 80 75 IO = 5mA 70 65 60 VCC = 1.2V 0 0.01 VOUT = 5.0V 55 VOUT = 2.5V 50 0.1 1 10 Output Current (mA) 100 1000 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5 Input Voltage (V) Efficiency vs. Input Voltage Efficiency vs. Input Voltage 100 100 IO = 100mA 95 IO = 60mA 95 90 90 85 IO = 50mA Efficiency (%) Efficiency (%) VOUT = 3.3V 80 IO = 5mA 75 70 65 60 85 IO = 50mA 80 75 70 65 IO = 5mA 60 55 55 VOUT = 3.3V 50 VOUT = 5.0V 50 0.9 1.2 1.5 1.8 2.1 2.4 Input Voltage (V) SG Micro Limited www.sg-micro.com 2.7 3 3.3 0.9 1.5 2.1 2.7 3.3 3.9 4.5 5.0 Input Voltage (V) 5 90% Efficient Synchronous Step-Up Converter with 1.2A Switch SGM6600 TYPICAL PERFORMANCE CHARACTERISTICS No Load Supply Current into VOUT vs. Input Voltage Maximum Output Current vs. Input Voltage 300 VOUT = 3.3V 700 600 VOUT = 2.5V No Load Supply Current into VOUT (µA) Maximum Output Current (mA) 800 VOUT = 5.5V 500 400 300 VOUT = 5V 200 100 TA = +85℃ 280 260 240 TA = +25℃ 220 TA = -40℃ 200 VOUT = 3.3V VIN = 0.9V to 5.5V 180 0 0.9 0.9 1.4 1.9 2.4 2.9 3.4 3.9 4.4 4.9 5.4 1.5 2.1 3.3 3.9 4.5 5.1 Input Voltage (V) Input Voltage (V) Output Voltage vs. Output Current Output Voltage vs. Output Current 3.35 5.1 VCC = 2.4V VOUT = 3.3V VCC = 3.6V VOUT = 5.0V 5.05 Output Voltage (V) Output Voltage (V) 2.7 3.3 3.25 5 4.95 4.9 4.85 3.2 4.8 1 10 100 Output Current (mA) SG Micro Limited www.sg-micro.com 1000 1 10 100 Output Current (mA) 1000 6 SGM6600 90% Efficient Synchronous Step-Up Converter with 1.2A Switch TYPICAL PERFORMANCE CHARACTERISTICS SG Micro Limited www.sg-micro.com 7 90% Efficient Synchronous Step-Up Converter with 1.2A Switch SGM6600 TYPICAL APPLICATION CIRCUITS L1 4.7µH 1 6 Power Supply SW VOUT C2 22µF VCC R1 SGM6600 C1 2×4.7µF 3 5 FB EN VCC Boost Output 4 R2 GND 2 Figure 1. Power Supply Solution for Maximum Output Power Operating from a Single or Dual Alkaline Cell L1 4.7µH 1 6 Power Supply SW VOUT C2 22µF VCC R1 SGM6600 C1 4.7µF 3 5 FB EN VCC Boost Output 4 R2 GND 2 Figure 2. Power Supply Solution Having Small Total Solution Size L1 4.7µH 1 6 Power Supply SW VOUT 5 C2 22µF VCC SGM6600 C1 4.7µF 3 EN FB LED Current Up to 30mA D1 4 GND 2 R1 Figure 3. Power Supply Solution for Powering White LEDs in Lighting Applications SG Micro Limited www.sg-micro.com 8 90% Efficient Synchronous Step-Up Converter with 1.2A Switch SGM6600 TYPICAL APPLICATION CIRCUITS C3 0.1µF VCC2 ~ 2×VCC Unregulated Auxiliary Output DS1 C4 1µF L1 4.7µH 1 6 Power Supply SW VOUT VCC R1 SGM6600 C1 2×4.7µF 3 5 FB EN VCC Boost Output C2 22µF 4 R2 GND 2 Figure 4. Power Supply Solution with Auxiliary Positive Output Voltage C3 0.1µF L1 4.7µH 1 6 Power Supply DS1 SW VOUT 5 R1 SGM6600 3 C4 1µF VCC C1 2×4.7µF FB EN VCC2 ~ -VCC Unregulated Auxiliary Output C2 22µF VCC Boost Output 4 R2 GND 2 Figure 5. Power Supply Solution with Auxiliary Negative Output Voltage SG Micro Limited www.sg-micro.com 9 90% Efficient Synchronous Step-Up Converter with 1.2A Switch SGM6600 TYPICAL APPLICATION CIRCUITS L1 4.7µH 1 6 SW 5 C2 22µF VCC C1 10µF Power Supply VOUT SGM6600-3.3 3 NC EN VOUT 3.3V 4 GND 2 Figure 6a. Basic Application Circuit for the Fixed Output Versions L1 4.7µH 1 6 SW 5 C2 22µF VCC C1 10µF Power Supply VOUT SGM6600-5.0 3 NC EN VOUT 5.0V 4 GND 2 Figure 6b. Basic Application Circuit for the Fixed Output Versions SG Micro Limited www.sg-micro.com 10 90% Efficient Synchronous Step-Up Converter with 1.2A Switch SGM6600 APPLICATION INFORMATION Design Procedure The SGM6600 DC/DC converter is intended for systems powered by a single-cell, up to triple-cell alkaline, NiCd, NiMH battery with a typical terminal voltage between 0.9V and 5.5V. They can also be used in systems powered by one-cell Li-ion or Li-polymer with a typical voltage between 2.5V and 4.2V. Programming Output Voltage In Figure1, the output voltage of the SGM6600 DC/DC converter can be adjusted with an external resistor divider. The typical value of the voltage at the FB pin is 500mV. The maximum recommended value for the output voltage is 5.5V. R1 and R2 are calculated using Equation 1: R1 = R2 ×（ VOUT VOUT − 1 ）= R2 × ( − 1) VFB 500mV (1) R2 is recommended to be 100KΩ. For example, if an output voltage of 3.3V is needed, a 560KΩ resistor should be chosen for R1. Inductor Selection A boost converter normally requires two main passive components for storing energy during the conversion. A boost inductor and a storage capacitor at the output are required. To select the boost inductor, it is recommended to keep the possible peak inductor current below the current limit threshold of the power switch in the chosen configuration. The highest peak current through the inductor and the switch depends on the output load, the input (VCC), and the output voltage (VOUT). Estimation of the maximum average inductor current is done using Equation 2: IL = IO × VOUT VCC × 0.8 (2) The second parameter for choosing the inductor is the desired current ripple in the inductor. Normally, it is advisable to work with a ripple of less than 20% of the average inductor current. A smaller ripple reduces the magnetic hysteresis losses in the inductor, as well as output voltage ripple and EMI. But in the same way, regulation time rises at load changes. In addition, a larger inductor increases the total system costs. With these parameters, it is possible to calculate the value for the inductor by using Equation 3: L= VCC × ( VOUT − VCC ) ∆IL × f × VOUT (3) Parameter f is the switching frequency and ∆IL is the ripple current in the inductor, i.e., 40% ∆IL. In this example, the desired inductor has the value of 4µH. With this calculated value and the calculated currents, it is possible to choose a suitable inductor. In typical applications, a 4.7µH inductance is recommended. The device has been optimized to operate with inductance values between 2.2µH and 10µH. Nevertheless, operation with higher inductance values may be possible in some applications. Detailed stability analysis is then recommended. Care must be taken because load transients and losses in the circuit can lead to higher currents as estimated in Equation 3. Also, the losses in the inductor caused by magnetic hysteresis losses and copper losses are a major parameter for total circuit efficiency. Input Capacitor At least a 10µF input capacitor is recommended to improve transient behavior of the regulator and EMI behavior of the total power supply circuit. A ceramic capacitor or a tantalum capacitor with a 100nF ceramic capacitor in parallel, placed close to the IC, is recommended. For example, for an output current of 75mA at 3.3V, at least 340mA of average current flows through the inductor at a minimum input voltage of 0.9V. SG Micro Limited www.sg-micro.com 11 90% Efficient Synchronous Step-Up Converter with 1.2A Switch SGM6600 APPLICATION INFORMATION Output Capacitor Layout Considerations The major parameter necessary to define the output capacitor is the maximum allowed output voltage ripple of the converter. This ripple is determined by two parameters of the capacitor, the capacitance and the ESR. It is possible to calculate the minimum capacitance needed for the defined ripple, supposing that the ESR is zero, by using Equation 4: As for all switching power supplies, the layout is an important step in the design, especially at high-peak currents and high switching frequencies. If the layout is not carefully done, the regulator could show stability problems as well as EMI problems. Therefore, use wide and short traces for the main current path and for the power ground tracks. The input capacitor, output capacitor, and the inductor should be placed as close as possible to the IC. Use a common ground node for power ground and a different one for control ground to minimize the effects of ground noise. Connect these ground nodes at any place close to the ground pin of the IC. CMIN = I O × ( VOUT − VCC ) f × ∆V × VOUT (4) Parameter f is the switching frequency and ∆V is the maximum allowed ripple. With a chosen ripple voltage of 10mV, a minimum capacitance of 4.5µF is needed. In this value range, ceramic capacitors are a good choice. The ESR and the additional ripple created are negligible. It is calculated using Equation 5: ∆VESR = IO × RESR (5) The total ripple is the sum of the ripple caused by the capacitance and the ripple caused by the ESR of the capacitor. Additional ripple is caused by load transients. This means that the output capacitor has to completely supply the load during the charging phase of the inductor. The value of the output capacitance depends on the speed of the load transients and the load current during the load change. With the calculated minimum value of 4.5µF and load transient considerations, the recommended output capacitance value is in a 22µF range. Care must be taken on capacitance loss caused by derating due to the applied dc voltage and the frequency characteristic of the capacitor. For example, larger form factor capacitors (in 1206 size) have their self resonant frequencies in the same frequency range as the SGM6600 operating frequency. So the effective capacitance of the capacitors used may be significantly lower. Therefore, the recommendation is to use smaller capacitors in parallel instead of one larger capacitor. SG Micro Limited www.sg-micro.com The feedback divider should be placed as close as possible to the ground pin of the IC. To lay out the control ground, it is recommended to use short traces as well, separated from the power ground traces. This avoids ground shift problems, which can occur due to superimposition of power ground current and control ground current. Thermal Information Implementation of integrated circuits in low-profile and fine-pitch surface-mount packages typically requires special attention to power dissipation. Many system-dependent issues such as thermal coupling, airflow, added heat sinks and convection surfaces, and the presence of other heat-generating components affect the power-dissipation limits of a given component. Three basic approaches for enhancing thermal performance follow. 1. Improving the power dissipation capability of the PCB design. 2. Improving the thermal coupling of the component to the PCB. 3. Introducing airflow in the system 12 90% Efficient Synchronous Step-Up Converter with 1.2A Switch SGM6600 PACKAGE OUTLINE DIMENSIONS SOT-23-6L D θ e1 e 0.2 L E1 E b c A A1 A2 Symbol Dimensions In Millimeters Min Max Dimensions In Inches Min Max A 1.050 1.250 0.041 0.049 A1 0.000 0.100 0.000 0.004 A2 1.050 1.150 0.041 0.045 b 0.300 0.500 0.012 0.020 c 0.100 0.200 0.004 0.008 D 2.820 3.020 0.111 0.119 E 1.500 1.700 0.059 0.067 E1 2.650 2.950 0.104 0.116 e 0.950 BSC 0.037 BSC e1 1.900 BSC 0.075 BSC L 0.300 0.600 0.012 0.024 θ 0° 8° 0° 8° SG Micro Limited www.sg-micro.com 13 SGM6600 90% Efficient Synchronous Step-Up Converter with 1.2A Switch SGMICRO is dedicated to provide high quality and high performance analog IC products to customers. All SGMICRO products meet the highest industry standards with strict and comprehensive test and quality control systems to achieve world-class consistency and reliability. For more information regarding SGMICRO Corporation and its products, please visit www.sg-micro.com SG Micro Limited www.sg-micro.com 14