SY8104IADC

SY8104I High Efficiency, Fast Response, 4.0A, 18V Input Synchronous Step Down Regulator General Description Features The SY8104I is a high efficiency 500kHz synchronous step-down DC/DC regulator, which is capable of delivering up to 4A load current. It can operate over a wide input voltage range from 4.2V to 18V and integrate main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss. The SY8104I adopts the instant PWM architecture to achieve fast transient responses for high step down applications and high efficiency at light loads. In addition, it operates at pseudo-constant frequency of 500kHz to minimize the size of inductor and capacitor. Ordering Information            Low RDS(ON) for Internal Switches (Top/Bottom): 55mΩ/36mΩ 4.2-18V Input Voltage Range 4A Output Current Capability 500kHz Switching Frequency Minimize the External Components Stable with 22µF COUT and 0.68µH Inductor Instant PWM Architecture to Achieve Fast Transient Responses Internal Soft-Start Limits the Inrush Current Cycle-by-cycle Peak/Valley Current Limitation Hic-cup Mode Output Short Circuit Protection Thermal Shutdown with Auto Recovery Output Auto Discharge Function Compact Package: TSOT23-6 Applications SY8104 □(□□)□ Temperature Code Package Code Optional Spec Code Ordering Number SY8104IADC  Package type TSOT23-6       Note ---- Set Top Box Portable TV DSL Modem LCD TV IP CAM Networking Typical Application Efficiency vs. Output Current CBS 100nF 100 L 3.9µH BS IN SY8104I CIN 10µF 95 VOUT : 3.3V LX EN FB GND 90 RH 100k CFF 100pF RL 22.1k Figure1. Schematic Diagram COUT 22µF Efficiency (%) VIN : 4.2~18V 85 80 75 70 VIN=5V,VOUT=3.3V Inductor and COUT Selection Table COUT [µF] L [µH] 4.7 10 22 2×22 0.68 √ √ 1.2 2.0 √ √ ☆ 1.5 √ √ √ 3.3 3.9 √ √ ☆ 2.2 √ √ √ 5 4.7 √ √ ☆ Note: ‘☆ ’ means recommended for most applications. VOUT [V] SY8104I Rev0.9B © 2018 Silergy Corp. VIN=12V,VOUT=3.3V 65 VIN=18V,VOUT=3.3V 60 0.01 0.1 1 10 Output Current (A) Figure2. Efficiency vs. Output Current Silergy Corp. Confidential- Prepared for Customer Use Only 1 All Rights Reserved. SY8104I Pinout (top view) FB 1 6 BS EN 2 5 LX GND 3 4 IN (TSOT23-6) Top mark: dLxyz (Device code: dL, x=year code, y=week code, z= lot number code) Pin Name Pin Number FB 1 EN 2 Pin Description Feedback pin. Connect this pin to the center point of the output resistor divider (as shown in Figure 1) to program the output voltage: VOUT=0.6×(1+RH/RL). Enable control pin. Pull high to turn on. Do not leave it floating. GND 3 Power ground pin. IN 4 LX 5 BS 6 Input pin. Decouple this pin to the GND pin with at least a 10µF ceramic capacitor. Inductor pin. Connect this pin to the switching node of inductor. Boot-strap pin. Supply high side gate driver. Connect a 0.1µF ceramic capacitor between BS and LX pin. Block Diagram IN Current Sense Internal Power BS Input UVLO 4.15V PWM Control & Protect Logic EN 1.2V FB LX Current Sense 0.6V Internal SST Thermal Protection GND Figure3. Block Diagram SY8104I Rev0.9B © 2018 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 2 All Rights Reserved. SY8104I Absolute Maximum Ratings (Note 1) Supply Input Voltage ------------------------------------------------------------------------------------------------ -0.3V to 19V LX, EN Voltage----------------------------------------------------------------------------------------------- -0.3V to VIN + 0.3V FB, BS-LX Voltage---------------------------------------------------------------------------------------------------- -0.3V to 4V Power Dissipation, PD @ TA = 25°C TSOT23-6, ----------------------------------------------------------------------- 2.0W Package Thermal Resistance (Note 2) θ JA ------------------------------------------------------------------------------------------------------- 50°C/W θ JC ------------------------------------------------------------------------------------------------------- 6.3°C/W Junction Temperature Range ------------------------------------------------------------------------------------ -40°C to 150°C Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------------ 260°C Storage Temperature Range -------------------------------------------------------------------------------------- -65°C to 150°C Dynamic LX Voltage in 10ns Duration (Note3) ---------------------------------------------------------- IN+3V to GND-5V Recommended Operating Conditions (Note 3) Supply Input Voltage -------------------------------------------------------------------------------------------------- 4.2V to 18V Junction Temperature Range ------------------------------------------------------------------------------------- -40°C to 125°C Ambient Temperature Range -------------------------------------------------------------------------------------- -40°C to 85°C SY8104I Rev0.9B © 2018 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 3 All Rights Reserved. SY8104I Electrical Characteristics (VIN = 12V, VOUT = 3.3V, L = 3.9µH, COUT = 22µF, TA = 25°C, IOUT = 1A unless otherwise specified) Parameter Input Voltage Range Input UVLO Threshold Input UVLO Hysteresis Quiescent Current Shutdown Current Feedback Reference Voltage FB Input Current Output Discharge Resistance Top FET RON Bottom FET RON EN Rising Threshold EN Falling Threshold Min ON Time Min OFF Time Turn On Delay Soft-start Time Switching Frequency Symbol VIN VUVLO VHYS IQ ISHDN VREF IFB RDIS RDS(ON)1 RDS(ON)2 VEN,R VEN,F tON,MIN tOFF,MIN tON,DLY tSS FSW Top FET Current Limit ILIM,TOP Bottom FET Current Limit Output Under Voltage Protection Threshold Output UVP Delay UVP Hiccup ON Time UVP Hiccup OFF Time Thermal Shutdown Temperature Thermal Shutdown Hysteresis ILIM,BOT Test Conditions Min 4.2 IOUT=0, VFB=VREF×105% EN=0 VFB=3.3V 591 -50 1.08 0.9 from EN high to LX start switching VOUT from 0 to 100% VOUT=3.3V, CCM 1 Typ 0.3 200 5 600 50 55 36 1.2 1.0 50 100 0.5 1.7 500 Max 18 4.15 280 10 609 50 105 55 1.32 1.1 2.4 Unit V V V µA µA mV nA Ω mΩ mΩ V V ns ns ms ms kHz 5.5 A 4 A VUVP 0.33 VREF tUVP,DLY tUVP,ON tUVP,OFF 100 2.5 9 µs ms ms TSD 150 ˚C THYS 15 ˚C Note 1: Stresses beyond the “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Note 2: θ JA is measured in the natural convection at T A = 25°C on a 2OZ four-layer Silergy evaluation board. Paddle of TSOT23-6 package is the case position for SY8104I θ JC measurement. Note 3: The device is not guaranteed to function outside its operating conditions. SY8104I Rev0.9B © 2018 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 4 All Rights Reserved. SY8104I TSOT23-6 Package Outline & PCB Layout Top view Side view Front view Recommended Pad Layout Notes: All dimensions in millimeter and exclude mold flash & metal burr. SY8104I Rev0.9B © 2018 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 5 All Rights Reserved. SY8104I Taping & Reel Specification 1. Taping orientation Feeding direction 2. Carrier Tape & Reel specification for packages Reel Size Package types Tape width (mm) Pocket pitch(mm) Reel size (Inch) Trailer length(mm) Leader length (mm) Qty per reel 8 4 7 400 160 3000 TSOT23-6 3. Others: NA SY8104I Rev0.9B © 2018 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 6 All Rights Reserved.