SD6209 SHOUDING | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 10
Technical content
Features
Wide Supply Voltage Operating Range: 2.4 to 5.5V Precision Feedback Reference Voltage: 0.6V (±2%) Shutdown Current: <1μA Internal Fixed PWM frequency: 550KHz Internal Soft Start Function :7ms (SS) Over Voltage Protection Package: SOT23-5L Duty Cycle: PWM/PFM Switching Control Circuit (15%~90%)
Applications
Chargers LCD Displays Digital Cameras Handheld Devices Portable Products Typical Application Circuit 209 FB EXT EN GND VOUTVIN Vcc ON/OFF SD6209 www.shouding.net Shouding
AXAX4444444444**** Function Block Diagram PWM Comp. Error Amp. Control and Driver Logic Oscillator EXT VCC EN UVLO Shutdown Circuitry FB 0.6V 550KHz Soft Start GND VRAMP Pin Descriptions SOT23-5L EXT AX Top View GND FB Name No. I / O Description FB 1 I Error Amplifier Inverting Input Vcc 2 P IC Power Supply EN 3 I Enable Control (Active High) GND 4 P IC Ground EXT 5 O External Transistor Connection Pin SD6209 Website: Rev. 0.62www.shouding.net Shouding
AXAX**9 Marking Information SOT23-5L Lot Number Part Number Code Ye AX986 Lot Number: Wafer lot number’s last two digits For Example: 132386TB 86 Year: Production year’s last digit Part Number Code: Part number identification code for this product. It should be always “AX”. SD6209 Website: Rev. 0.62www.shouding.net Shouding
Ordering Information
Part Number Code Operating Temperature Package MOQ Description 9KR-G1 -25°C ~ 85°C SOT23-5L 3000EA Tape & Reel Absolute Maximum Ratings Parameter Symbol Conditions Min. Typ. Max. Unit Supply Voltage VCC 0 5.5 V EN,FB Voltage 0 5.5 V Power Dissipation PD SOT23-5L @TA=25°C 455 mW Thermal Resistance (Note1) θJA SOT23-5L +220 °C / W Junction Temperature TJ +150 °C Operating Temperature TOP -25 +85 °C Storage Temperature TST -65 +150 °C Lead Temperature (soldering, 10 sec) +260 °C IR Re-flow Soldering Curve AX*** SD6209 Website: Rev. 0.62www.shouding.net Shouding
Recommended Operating Conditions Parameter Symbol Conditions Min. Typ. Max. Unit Supply Voltage VIN 2.4 5.5 V Operating Temperature Range TA Ambient Temperature -25 +85 °C Parameter Symbol Conditions Min. Typ. Max. Unit System Supply Input Input Supply Range VCC 2.4 5.5 V Operating Start Voltage VST 1.1 V Under Voltage Lockout VUVLO 2.1 V UVLO Hysteresis 0.1 V Quiescent Current ICC FB=1.0V, No switch 70 µA Shutdown Current ICC VEN=GND 0.1 µA Oscillator Operation Frequency fOSC VFB=0.6V 550 kHZ PFM Switching Duty Ratio % 15 % Maximum Duty Ratio % 90 % Soft-Start Time tSS 7 ms Reference Voltage Feedback Voltage VREF 0.588 0.6 0.612 V Enable Control Enable Voltage VEN 0.96 V Shutdown Voltage VEN 0.6 V External Transistor Connection current EXT Pin Output Current IEXTH -105 mA EXT Pin Output Current IEXTL 130 mA SD6209 Website: Rev. 0.62www.shouding.net Shouding
Drive Enable pin to ground to shut down the SD6209. Shutdown mode forces to turn off all 6 9Soft start circuitry is integrated into SD the error amplifier. The SD6209 changes to PFM mode when output is light load. It can increase The SD6209 is a voltage mode boost controller. The switching is a fixed frequency 5 Function Description Operation 50kHz and operates with pulse width modulation (PWM). An internal resistive divider provides 0.6V reference for efficiency, but PFM mode also increases output voltage ripple. Soft Start Function 20 to avoid inrush current during power on. After the IC is enabled, the output of error amplifier is clamped by the internal soft -start function, which causes PWM pulse width increasing slowly and thus reducing input surge current. Shutdown Function internal circuitry, and reduces the VIN supply current to 0.1μA (typ). The Enable pin rising threshold is 0.96V (typ). Before any operation begins, the voltage at Enable pin must exceed 0.96V (typ). SD6209 Website: Rev. 0.62www.shouding.net Shouding
Application Information
Inductance value is decided based on different condition. 3 .3uH to 4.7 µH induct ance value is recommended for general application circuit. There are three important inductor specifications, DC resistance, saturation current and core loss. Low DC resistance has better power efficiency. Capacitor Selection The output capacitor is required to maintain the DC voltage. Low ESR capacitors are preferred to reduce the output voltage ripple. Ceramic capacitor of X5R and X7R are recommended, which have low equivalent series resistance (ESR) and wider operation temperature range. Diode Selection Schottky diodes with fast recovery times and low forward voltages are recommended. Ensure the diode average and peak current rating exceed the average output current and peak inductor current. In addition, the diode’s reverse breakdown voltage must exceed the output voltage. Output Voltage Programming The output voltage is set by a resistive voltage divider from the output voltage to FB. The output voltage is: 2R 1R1V6.0VOUT Layout Considerations 1. The power traces, consisting of the GND trace, the MOS drain trace and the V CC trace should be kept short, direct and wide. 2. Layout switching node MOS drain, inductor and diode connection traces wide and short to reduce EMI. 3. Place CIN nearby VCC pin as closely as possible to maintain input voltage steady and filter out the pulsing input current. 4. The resistive divider R1and R2 must be connected to FB pin directly and as closely as possible. 5. FB is a sensitive node. Please keep it away from switching node, MOS drain. 6. The GND of the IC, C IN and COUT should be connected close together and directly to a ground plane. SD6209 Website: Rev. 0.62www.shouding.net Shouding
Website: Rev. 0.62www.shouding.net Shouding
3V~4.2V FB EXT EN GND VOUT 5V/2.1A Vcc 10µF 22µF*2 D1 SM540A 88K 12K L1 3.3µH SOT23-5L Optional FB EXT EN GND VOUT 5V/3A VIN 3V~4.2V Vcc 10µF 22µF*2 D1 SM540A*2 88K 12K L1 3.3µH SOT23-5L Optional 100µF Note: 1. C1 and C3 choose ceramic capacitor of X5R or X7R. 2. R3 and C5 are added for reducing EMI (Electromagnetic Interference). 6SD 209 6SD 209 SD6209 Website: Rev. 0.62www.shouding.net Shouding
Unit: mm Note: 1. Package dimensions are in compliance with JEDEC outline: MO-178 AA. 2. Dimension “D” does not include molding flash, protrusions or gate burrs. 3. Dimension “E1” does not include inter-lead flash or protrusions. Symbols Min. (mm) Max.(mm) A 1.050 1.350 A1 0.050 0.150 A2 1.000 1.200 b 0.250 0.500 c 0.080 0.200 D 2.700 3.000 E 2.600 3.000 E1 1.500 1.700 e 0.950 BSC e1 1.900 BSC L 0.300 0.550 L1 0.600 REF L2 0.250 BSC θ° 0° 10° θ1° 3° 7° θ2° 6° 10° SD6209 Website: Rev. 0.62www.shouding.net Shouding