TD8602

Techcode® DATASHEET 3.1A constant load current Boost DC/DC Controller TD8602 General Description Features TD8602 is a compact, high efficiency, fixed frequency Boost DC/DC regulator. PFM mode for improved efficiency at low output power. The 1MHz high switching frequency allows smaller inductor and output capacitor, making the TD8602 ideally suited for small battery-powered applications and internal compensation reduce external component count and saves PCB space. The TD8602 contains thermal shutdown function and over current protection circuit. Built-in soft-start circuitry prevents excessive inrush current during start-up. The TD8602 is available in a Pb-free, SOP-8 package.          Boost DC/DC regulator with 3.1A constant load current With internal NMOS. Device quiescent current: 280uA. Internal soft_start and internal compensation. 6A maximum peak current limit. Switching frequency: 1MHz. Power save mode(PFM) for improved efficiency at low output power Over current protect and over temperature protection. Compact package: SOP-8. Applications    Cell Phone and Smart Phone PDA, PMP, MP3 Digital Camera Pin Configurations VIN 1 EN 2 GND 3 FB 4 TD8602 8 GND 7 GND 6 LX 5 LX Figure1 Pin Configuration of TD8602(Top View) March, 20, 2014. Techcode Semiconductor Limited 1 www.techcodesemi.com Techcode® DATASHEET 3.1A constant load current Boost DC/DC Controller TD8602 Pin Description Pin Number Pin Name Description 1 VDD Power Input pin. 2 EN Enable control. High to turn on the part. Don’t leave it floated. 3 GND GND 4 FB Feedback pin. Connect a resistor R1 between VOUT and FB, and a resistor R2 between FB and GND to program the output voltage: VOUT=0.6V*(R1/R2+1) 5 LX Inductor node. Connect an inductor between VDD pin and LX pin. 6 LX Inductor node. Connect an inductor between VDD pin and LX pin. 7 GND GND 8 GND GND Ordering Information TD8602 □ □ Circuit Type Packing: Blank：Tube R: Tape and Reel P: SOP-8 March, 20, 2014. Techcode Semiconductor Limited 2 www.techcodesemi.com Techcode® DATASHEET 3.1A constant load current Boost DC/DC Controller TD8602 Function Block VDD EN Enable LX OSC Souse Current sense uvlo Bandgap ovp Soft start Logic EA FB Driver PWM GND Figure 2 Function Block Diagram of TD8602 Absolute Maximum Ratings EN, VDD, LX,------------------------------------------------------------------------------------------------------------------------------ 7V FB------------------------------------------------------------------------------------------------------------------------------------------- 3.6V SOP-8, θJA ------------------------------------------------------------------------------------------------------------------------------- 90°C/W SOP-8, θJC ------------------------------------------------------------------------------------------------------------------------------- 45°C/W Junction Temperature Range ------------------------------------------------------------------------------------------------------- 125°C Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------------------- 260°C Storage Temperature Range --------------------------------------------------------------------------------------------------------- -65°C to 150°C March, 20, 2014. Techcode Semiconductor Limited 3 www.techcodesemi.com Techcode® DATASHEET 3.1A constant load current Boost DC/DC Controller TD8602 Recommended Operating Conditions VDD pin----------------------------------------------------------------------------------------------------------------------------------- 2.8V to 4.2V FB------------------------------------------------------------------------------------------------------------------------------------------- 0V to 1V Junction Temperature Range ------------------------------------------------------------------------------------------------------ -40°C to 125°C Ambient Temperature Range ------------------------------------------------------------------------------------------------------ -40°C to 85°C Electrical Characteristics (VIN = 3.3V, VOUT=5V, IOUT=100mA, TA = 25°C unless otherwise specified) Parameters Symbol Test Condition Min. Typ. Max. Unit Input voltage range VDD 2.8 Output Voltage VOUT 3 Shutdown Current ISD VEN=0V,VOUT=5V 8.3 µA Quiescent Current IQ VEN=2V,VFB=1V 280 µA 5 4.2 V 6 V OTP Thermal Shutdown 3V