SY7901DBC

SY7901 High Efficiency 500kHz, 25V PWM Controller with DC Input Current Limit General Description Features • • • • • • Input Voltage Range 3V to 25V 500kHz Fixed Switching Frequency An Accurate DC Input Current Limit External Compensation Internal Soft-start Limits the Inrush Current Integrated Low Side Driver: 1.5A Sourcing and 3A Sinking • RoHS Compliant and Halogen Free • Compact Package: DFN3×3-10 The SY7901 is a current mode DC/DC controller targeted for Boost, Sepic, Flyback and Forward applications. The SY7901 has an accurate DC input current limit. External compensation provides flexible adjustment of control loops for different applications. The internal low side driver is capable of sourcing 1.5A and sinking 3A current. Ordering Information SY7901 □(□□)□ Applications Temperature Code Package Code Optional Spec Code l-F or VIN 半 Typical Applications Note ---- 芯 Package type DFN3×3-10 导 小 Ordering Number SY7901DBC • GPS Navigation Systems • Handheld Devices • Portable Media Player CIN COMP en tia R4 C4 Sil erg yC on fid ON/OFF SY7901 Rev. 0.9C © 2020 Silergy Corp. CSS SS C1 L IN C2 VOUT VCC EN GATE FB CS RG C M R1 Co R3 GND D R2 RS ISEN C3 Figure1. Schematic Diagram Silergy Corp. Confidential- Prepared for Customer Use Only 1 All Rights Reserved. SY7901 Pinout (top view) EN 1 10 VIN SS 2 9 VCC FB 3 8 GATE COMP 4 7 CS SGND 5 6 ISEN PGND (DFN3×3-10) Top Mark: FRxyz for SY7901 (Device code: FR, x=year code, y=week code, z= lot number code) Pin Number VIN 10 VCC 9 GATE 8 CS 7 ISEN 6 SGND 5 COMP 4 FB 3 导 小 半 l-F or 2 1 Exposed Paddle en tia SS EN PGND Pin Description Input pin. Decouple this pin to the PGND pin with at least a 1µF ceramic capacitor. 5V Internal LDO output from VIN. Connect a 4.7 µF capacitor from this pin to PGND. Driver pin. Connect the gate of the power NFET to this pin. Current sense pin. Connect an external current sensing resistor RS from this pin to GND. The voltage on this pin is used for providing MOSFET current feedback in the control loop and cycle-by-cycle peak current limit. Peak current limit is triggered when the sensed voltage plus the slope compensation exceed 340mV. Connect this pin to CS to program the input average current limit. The input current limit should be IiLIM=100mV/Rs Signal ground pin. External compensation pin. Connect the RC network from this pin to SGND to compensate the control loop. Output voltage feedback pin. Connect this pin to the output voltage divider to program output voltage: VOUT=1V×(1+R1/R2) Connect a capacitor from this pin to SGND to program the soft-start time. Enable pin. Pull it high to turn on the chip. Do not leave this pin floating. Power ground pin. 芯 Pin Name fid Absolute Maximum Ratings (Note 1) Sil erg yC on IN, EN ----------------------------------------------------------------------------------------------------------------------------- 26V GATE ------------------------------------------------------------------------------------------------------------------- VCC+0.3V All Other Pins ---------------------------------------------------------------------------------------------------------------------- 6V Power Dissipation, P D @ TA = 25°C, DFN3×3-10--------------------------------------------------------------- 2.6W Package Thermal Resistance (Note 2) θJA ---------------------------------------------------------------------------------------------------------------------- 38°C/W θJC ----------------------------------------------------------------------------------------------------------------------- 8°C/W Junction Temperature Range -------------------------------------------------------------------------------------- -40 to 150°C Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------- 260°C Storage Temperature Range ------------------------------------------------------------------------------------- -65°C to 150°C Recommended Operating Conditions (Note 3) IN--------------------------------------------------------------------------------------------------------------------- 3V to 25V Junction Temperature Range ------------------------------------------------------------------------------------ -40°C to 125°C Ambient Temperature Range ----------------------------------------------------------------------------------- -40°C to 85°C SY7901 Rev. 0.9C © 2020 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 2 All Rights Reserved. SY7901 Electrical Characteristics (VIN = 12V, TA = 25°C, unless otherwise specified) Parameter Input Voltage Range Quiescent Current Shutdown Current Feedback Reference Voltage FB Input Current Current Sense Limit Internal Slope Compensation Gm of EA Gate Driver Output Peak Current Conditions VVCC TSD THYST VIN=5.5V Min 3 FB=1.1V EN=0 VFB=VIN 0.98 -50 98 Typ 170 0.1 1 100 40 300 1.5 3 Max 25 1.02 50 102 1.5 0.4 2.9 4.9 0.3 500 200 200 5 150 20 5.1 Unit V µA µA V nA mV mV/µS µA/V A A V V V V kHz ns ns V ℃ ℃ 半 导 小 芯 EN Rising Threshold EN Falling Threshold Input UVLO threshold UVLO hysteresis Oscillator Frequency Min ON Time Min OFF Time Internal LDO Output Thermal Shutdown Thermal Hysteresis Symbol VIN IQ ISHDN VREF IFB ISEN VSLOPE Gm ISOURCE ISINK VENH VENL VUVLO VHYS FOSC tia l-F or Note 1: Stresses beyond “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. 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. on fid en Note 2: θ JA is measured in the natural convection at TA = 25°C on a low effective single layer thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Test condition: Device mounted on 2” x 2” FR-4 substrate PCB, 2oz copper, with minimum recommended pad on top layer and thermal vias to bottom layer ground plane. Sil erg yC Note 3: The device is not guaranteed to function outside its operating conditions. SY7901 Rev. 0.9C © 2020 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 3 All Rights Reserved. SY7901 DFN3×3-10 Package Outline PCB layout (recommended) Side View Sil erg yC on fid en tia l-F or 半 导 小 芯 Top View Detail A Pin1 identifier: two options Bottom View Notes: All dimensions are in millimeters and exclude mold flash & metal burr. SY7901 Rev. 0.9C © 2020 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 4 All Rights Reserved. SY7901 Taping & Reel Specification 1. DFN3×3-10 taping orientation 3.9/4.1 11.7/12.3 1.45/1.55 Feeding direction Sil erg yC on fid en Reel Size tia l-F or 半 导 小 芯 2. Carrier Tape & Reel specification for packages Package types DFN3×3 Tape width (mm) Pocket pitch(mm) Reel size (Inch) Trailer length(mm) Leader length (mm) Qty per reel 10 8 13" 400 400 5000 SY7901 Rev. 0.9C © 2020 Silergy Corp. Powered by TCPDF (www.tcpdf.org) Silergy Corp. Confidential- Prepared for Customer Use Only 5 All Rights Reserved.