SY7066AQMC

Application Note: AN_SY7066/SY7066A 1.8V Minimum Input and 5. 5V Maximum Output 6A Peak Current Synchronous Boost with Output Disconnect Features General Description SY7066/SY7066A is a high efficiency synchronous boost regulator that converts down to 1.8V input and 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 SY7066 □(□□)□ • Temperature Code Package Code Optional Spec Code Ordering Number SY7066QMC SY7066AQMC Package type QFN2X2-10 QFN2X2-10 • • • • • • • • • Note ------- 1.8V Minimum input voltage Adjustable output voltage from 2.5V to 5. 5V 6A peak current limit Input under voltage lockout Load disconnect during shutdown Output over voltage protection Input battery voltage monitor Low RDS(ON) (main switch/synchronous switch) at 5.0V output: 20/40mohm Automatic output discharge at shutdown: ο SY7066: Auto output discharge function ο SY7066A: No output discharge function Compact package: QFN2x2-10 Applications • 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_SY7066/A Rev. 0.9B Figure 2. Efficiency Figure Silergy Corp. Confidential- Prepared for Internal Use Only 1 AN_SY7066/A Pinout (top view) (QFN2X2-10) Name PVOUT SVOUT LX PGND SGND IN EN LBI FB LBO Top mark: MGxyz for SY7066 (Device code: MG., x=year code, y=week code, z= lot number code) Aaxyz for SY7066A (Device code: Aa., x=year code, y=week code, z= lot number code) QFN2X2-10 Description 1 Power output pin. Decouple this pin to GND pin with at least 22uF ceramic cap. Signal output pin. Decouple this pin to GND pin with at least 1.0uF ceramic cap for noise 6 immunity consideration. 2 Inductor node. Connect an inductor between IN pin and LX pin. 3 Power ground pin. 4 Signal ground pin. 5 Signal input pin. 7 Enable pin. Internal integrated with 1Mohm pull down resistor. 8 Low battery comparator input. Feedback pin. Connect a resistor R1 between OUT and FB, and a resistor R2 between FB 10 and GND to program the output voltage. VOUT=1.2V*(R1/R2+1). 9 Low battery comparator output.(open drain) . Absolute Maximum Ratings (Note 1) EN-----------------------------------------------------------------------------------------------------------------------VOUT+0.3V Other Pins------------------------------------------------------------------------------------------------------------------- 6V Power Dissipation, PD@ TA=25°C QFN2x2-10------------------------------------------------------------------------2.5W Package Thermal Resistance (Note 2) θ JA ---------------------------------------------------------------------------------------------------------------50°C/W θ JC ---------------------------------------------------------------------------------------------------------------10°C/W 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 ------------------------------------------------------------------------------------------------------------------ 1.8V to 5.25V PVOUT, SVOUT------------------------------------------------------------------------------------------------- 2.5V to 5.5V EN ---------------------------------------------------------------------------------------------------------------- 0V to VOUT+0.3V All other pins ------------------------------------------------------------------------------------------------------------- 0-5.5V Junction Temperature Range ---------------------------------------------------------------------------------- -40°C to 125°C Ambient Temperature Range ----------------------------------------------------------------------------------- -40°C to 85°C AN_SY7066/A Rev. 0.9B Silergy Corp. Confidential- Prepared for Customer Use Only 2 AN_SY7066/A Electrical Characteristics (VIN =2.4V, VOUT=5V, IOUT=500mA, TA = 25°C unless otherwise specified) Parameter Input Voltage Output Voltage Range Quiescent Current VIN VOUT Shutdown Current Linear charge current Symbol VIN VOUT IQ Soft-start time Input Vin UVLO threshold Vin UVLO hysteresis EN Rising Threshold EN Falling Threshold LBI Voltage Threshold LBI Input Hysteresis Low Side Main FET RON Synchronous FET RON Main FET Current Limit Switching Frequency Feedback Reference Voltage Output over voltage protection Minimum on time Minimum off time Max on time Thermal Shutdown Temperature Thermal Shutdown hysteresis Output Discharge Resistor Tss VUVLO VHYS VENH VENL VLBI VLBI_HYS RDS(ON)1 RDS(ON)2 ILIM1 fsw VREF VOVP TON_MIN TOFF_MIN TON_MAX TSD THYS RDSC ISHDN ICHARGE Test Conditions Min 1.8 2.5 Io=0A,VEN=VIN=1.8V, VOUT=5.0V VEN=0V, VIN=2.4V VOUT≤1V 1V