BL8529 3A 1.5MHz 5.5V Synchronous Buck Converter FEATURES DESCRIPTION • • • • • • • • The BL8529 is a high efficiency synchronous, buck DC/DC converter. Its input voltage range is from 2.6V to 6V and provides an adjustable regulated output voltage from 0.8V to 5.5V while delivering up to 3A of output current. The internal synchronous switches increase efficiency and eliminate the need for an external Schottky diode. The switching frequency is set by an external resistor or can be synchronized to an external clock. The 100% duty cycle provides low dropout operation extending battery life in portable systems. Adjustable Output Voltage, Vfb=0.8V Maximum output current is 3A Range of operation input voltage: Max 6V Standby current: 0.5mA (typ.) Line regulation: 0.1%/V (typ.) Load regulation: 10mV (typ.) High efficiency, up to 96% Environment Temperature: -20°C~85°C APPLICATIONS • • • • • • The BL8529 is operated in PFM/PWM auto-switch mode which enhance the efficiency at light-load. The BL8529 is available in the DFN2x2-8L and DFN3x3-10L package TYPICAL APPLICATION Power Management for 3G modem 3W LED driver from Li-ion battery LCD Monitor and LCD TV DVD Decode Board ADSL Modem Post Regulators for Switching Supplies PIN OUT & MARKING BL852 BL8529 1.EN_ 8. COMP 2. GND 7. FB 3. LX 6. VDD 4. PGND 5. PVDD DFN2x2-8L www.belling.com.cn 1 BL8529 ORDERING INFORMATION Part No. BL8529CKBTR BL8529CKATR Package Tape&Reel DFN2x2-8L DFN3x3-10L 3000/Reel 3000/Reel ABSOLUTE MAXIMUM RATING Parameter Value Max Input Voltage Max Operating Junction Temperature(Tj) Ambient Temperature(Ta) Package Thermal Resistance DFN2x2-8L Storage Temperature(Ts) Lead Temperature & Time ESD (HBM) 6V 125°C -20°C – 85°C 25°C / W -40°C - 150°C 260°C, 10S >2000V Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect device reliability. RECOMMENDED WORK CONDITIONS Parameter Value Input Voltage Range Operating Junction Temperature(Tj) Max. 6V -20°C –125°C ELECTRICAL CHARACTERISTICS (VDD=5V, TA=25°C) Symbol Parameter VDD Input Voltage Range Vref Feedback Voltage Ifb Feedback Leakage current Iq Quiescent Current Conditions Min Typ 2.6 0.784 0.8 0.1 Active, Vfb=0.78, No Switching Shutdown Max Unit 5.5 V 0.816 V 0.4 uA 450 uA 1 uA LnReg Line Regulation Vin=4V to 5.5V 0.1 %/V LdReg Load Regulation Iout=1 to 3A 0.02 %/A 600 us Gm Fsoc EA Transconductance 1.35 MHz RdsonP PMOS Rdson Switching Frequency 150 mohm RdsonN NMOS Rdson 130 mohm Ilimit Peak Current Limit Ven_ EN_ Shutdown Voltage www.belling.com.cn Ren_=180K 3.8 Vin-0.7V 2 A Vin BL8529 TYPICAL PERFORMANCE CHARACTERISTICS www.belling.com.cn 3 BL8529 TYPICAL PERFORMANCE CHARACTERISTICS cont’ Power On & Soft Start Load Transient Response CH2: Output Ripple CH1: Load Current CH1: Input Voltage CH2: Output Voltage CH3: Switching Wave CH4: Inductor Current DETAILED DESCRIPTION BL8529 is a 3A synchronous buck, with frequency adjusted by Ren_. It can achieve conversion efficiency up to 95%. It also support 100% duty cycle which will maximize the battery usage. Only a inductor and a few R & C need for peripheral. The PCB size can be very small Please note that EN_ pin has to be pull high if one wants to shutdown the chip. And nd release it (with a Ren_ connected to GND) to have it work. One can also switch off BL8529 by connect enable signal with at least 1mA driving capability to VDD pin (pin 6 of DFN2x2 and pin 8 of DFN3x3 package). www.belling.com.cn 4 BL8529 PACKAGE OUTLINE Package DFN2x2-8L Package specification： Devices per reel 3000 Unit mm Package DFN3x3-10L Package specification： Devices per reel 3000 Unit mm www.belling.com.cn 5