SY7069ADC

Application Note: SY7069 5.5V Maximum Output, 3A Valley Current, 1MHz Synchronous Boost with Auto Bypass Function General Description Features SY7069 is a high efficiency, synchronous, step-up boost converter designed for one-cell Li-Ion or Lipolymer, or a two to three-cell alkaline Ni-Cd or NiMH battery powered applications. It can convert down to 2.5V input voltage and up to 5.5V output voltage. It adopts NMOS for the main switch and PMOS for the synchronous switch. SY7069 can disconnect the output from input during the shutdown mode. When input voltage exceeds the regulated output voltage, SY7069 enters bypass mode automatically. Ordering Information SY7069 □(□□)□ Package type TSOT23-6     2.5V minimum input voltage Adjustable output voltage from 2.5V to 5.5V Min 3A valley current limit Capable for seamless transition between boost and bypass mode Load disconnect during shutdown Low RDS(ON) (main switch/synchronous switch) at 5.0V output: 50mΩ/90mΩ Output OVP protection Compact package TSOT23-6 package Applications  Temperature Code Package Code Optional Spec Code Ordering Number SY7069ADC     All Single Cell Li or Dual Cell Battery Operated Products as MP-3 Player, PDAs, and Other Portable Equipment. Note ---- Typical Applications Figure 1. Schematic Diagram AN_SY7069 Rev. 0.9 Silergy Corp. Confidential- Prepared for Customer Use Only 1 SY7069 Pinout (top view) FB 1 6 EN IN 2 5 LX GND 3 4 OUT (TSOT23-6) Top mark: Iexyz (Device code: Ie, x=year code, y=week code, z= lot number code) Name TSOT23-6 FB 1 IN 2 GND OUT LX EN 3 4 5 6 Description Output 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=1.2× (1+RH/RL). Signal input pin. Decouple this pin to GND pin with at least 1uF ceramic cap for noise immunity consideration. Ground pin. Output pin. Decouple this pin to GND pin with at least 22µF ceramic cap. Inductor node. Connect an inductor between IN pin and LX pin. Enable pin. Pull high to turn on. Do not leave it floating. Absolute Maximum Ratings (Note 1) All Pins------------------------------------------------------------------------------------------------------------------------------- -- 6.0V Power Dissipation, PD@ TA=25°C, TSOT23-6----------------------------------------------------------------------------- --1.92W Package Thermal Resistance (Note 2) θ JA---------------------------------------------------------------------------------------------------------------------------------------------------------------------------- 52°C/W θ JC---------------------------------------------------------------------------------------------------------------------------------------------------------------------------- 32°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------------------------------------------------------------------------------------------------------------------------------ 2.5V to 5.5V OUT------------------------------------------------------------------------------------------------------------------------ -- 2.5V to 5.5V EN, FB-------------------------------------------------------------------------------------------------------------------- V 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_SY7069 Rev. 0.9 Silergy Corp. Confidential- Prepared for Customer Use Only 2 SY7069 Electrical Characteristics (VIN =3.0V, VOUT=5.0V, IOUT=500mA, TA = 25°C unless otherwise specified) Parameter Symbol Test Conditions VIN Input Voltage VOUT Output Voltage Range V IN Quiescent IQ Io=0A,VEN=VIN=3.0V, VOUT Current VOUT=5.0V,VFB=105%VREF ISHDN Shutdown Current VEN=0V, VIN=3.0V ICHARGE Linear Charge Current VOUT