SY7088DGC

昱灿电子 www.szyucan.com  Application Note: SY7088 2.3V Minimum Input and 5.5V Maximum Output 3A Peak Current Synchronous Boost with Output Disconnect Preliminary Specification General Description Features SY7088 is a high efficiency synchronous boost regulator that converts up to 5.5V output voltage. It adopts NMOS for the main switch and PMOS for the synchronous switch. It can disconnect the output from input during the shutdown mode. Ordering Information SY7088 □(□□ □□)□ □□ □ Tempera ture Code Packa ge Code Optiona l Spec Code Ordering Number SY7088DGC Package type DFN2x3-8 • • • • • • • • 2.3-5.0V input voltage range Adjustable output voltage from 2.5V to 5.5V Pseudo-constant frequency: 1MHz 3A peak current limit Input under voltage lockout Load disconnect during shutdown Output over voltage protection Low RDS(ON) (main switch/synchronous switch) at 5.0V output: 70/100mohm • Compact package: DFN2x3-8 Applications Note ---- • All Single Cell Li or Dual Cell Battery Operated Products as MP-3 Player, PDAs, and Other Portable Equipment. Typical Applications Figure 1. Schematic Diagram AN_SY7088 Rev. 0.1A Figure 2. Efficiency Figure 1 昱灿电子 www.szyucan.com  SY7088 Pinout (top view) (DFN2x3-8) Top mark: VTxyz (Device code: VT, x=year code, y=week code, z= lot number code) Name LX EN SGND DFN2x3-8 1, 2 3 4 FB 5 IN 6 OUT PGND 7, 8 9 Description Inductor node. Connect an inductor between IN pin and LX pin. Enable pin. Internal integrated with 1Mohm pull down resistor. Signal ground pin. Feedback pin. Connect a resistor RH between OUT and FB, and a resistor RL between FB and GND to program the output voltage. VOUT=1.2V*(RH/RL+1). Signal input pin. Decouple this pin to GND pin with at least 1.0uF ceramic cap for noise immunity consideration. Power output pin. Decouple this pin to GND pin with at least 10uF ceramic cap. Power ground pin. Absolute Maximum Ratings (Note 1) EN-----------------------------------------------------------------------------------------------------------------------VOUT+0.3V Other Pins----------------------------------------------------------------------------------------------------------------------- 6V Power Dissipation, PD@ TA=25°C DFN2x3-8-------------------------------------------------------------------------- TBD Package Thermal Resistance (Note 2) θ JA ---------------------------------------------------------------------------------------------------------------- TBD θ JC ---------------------------------------------------------------------------------------------------------------- TBD Junction Temperature Range -------------------------------------------------------------------------------------------- 150°C Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------------- 260°C Storage Temperature Range ---------------------------------------------------------------------------------- -65°C to 150°C Recommended Operating Conditions (Note 3) IN ------------------------------------------------------------------------------------------------------------------- 2.3V to 5.25V OUT----------------------------------------------------------------------------------------------------------------- 2.5V to 5.5V EN, FB-------------------------------------------------------------------------------------------------------- 0V to VOUT+0.3V Junction Temperature Range -------------------------------------------------------------------------------- -40°C to 125°C Ambient Temperature Range --------------------------------------------------------------------------------- -40°C to 85°C AN_SY7088 Rev. 0.1A 2 昱灿电子 www.szyucan.com  SY7088 Electrical Characteristics (VIN =2.4V, VOUT=5V, IOUT=500mA, TA = 25°C unless otherwise specified) Parameter Input Voltage Output Voltage Range Quiescent Current Symbol VIN VOUT VIN VOUT IQ Shutdown Current ISHDN Linear charge current ICHARGE Soft-start time Input Vin UVLO threshold Vin UVLO hysteresis EN Rising Threshold EN Falling Threshold Low Side Main FET RON Synchronous FET RON Main FET Current Limit Feedback Reference Voltage Minimum on time Max on time OUT pin OVP protection OUT pin OVP hysteresis Thermal Shutdown Temperature Thermal Shutdown hysteresis Tss VUVLO Vhys VENH VENL RDS(ON)1 RDS(ON)2 ILIM VREF TON_MIN TON_MAX VOVP VOVP_HYS TSD THYS Test Conditions Min 2.3 2.5 Typ 2 30 0.1 1.2 1.0 0.5 Io=0A,VEN=VIN=2.3V, VOUT=5.0V VEN=0V, VIN=2.4V VOUT