BL8536CC3TR-3.3V

BL8536 0.9V startup, 1MHz, 300mA Iout, Low Iq, Synchronous Boost converter DESCRIPTION FEATURES The BL8536 is a step-up converter that provides a boosted output voltage from a low voltage source. Because of its proprietary design, it starts up at a very low input voltage down to 0.9V, and only consumes 15uA at standby, making it an ideal choice for single cell alkaline/NiMH battery operations.    A switching frequency of 1MHz minimizes solution footprint by allowing the use of tiny, low profile inductors and ceramic capacitors. The current mode PWM design is internally compensated, reducing external parts count. BL8536 is available in SOT23-3 and SOT89-3 Package.        Efficiency up to 94%@Vin=3.3V, Vout=5.5V Typical 15uA standby current 1MHz Switching Frequency allows small inductor and output cap Input boost-strapping allows using small or no input cap Low Vin Start-up Voltage down to 0.9V Ideal for Single Alkaline Cell operations Maximum Output Current up to 300mA Low Noise PWM control Internally Compensated Current Mode Control Internal Synchronous Rectifier Available in SOT23-3 and SOT89-3 APPLICATIONS      TYPICAL APPLICATION One to Three Cell Battery Operated Devices Medical Instruments Bluetooth Headsets Flash-Based MP3 Players Noise Canceling Headphones PIN OUT & MARKING 2.2uH OUT 3 SW VIN SXX LLHYW SXYW VOUT OUT 10uF BL8536 LC3500 1 GND 10uF 2 SW SOT23-3 GND S: Product Code X: Output Voltage YW: Date code www.belling.com.cn 1 1 2 3 GND OUT SW SOT89-3 S: Product Code XX: Output Voltage LL: LOT No. H: FAB Code YW: Date code BL8536 ORDERING INFORMATION PART No. PACKAGE Tape&Reel BL8536CB3TR BL8536CC3TR SOT23-3 SOT89-3 3000/Reel 1000/Reel ABSOLUTE MAXIMUM RATING Parameter Value SW Voltage OUT Voltage Max Operating Junction Temperature(Tj) SOT23-3 Maximum Power Dissipation SOT89-3 Ambient Temperature(Ta) Storage Temperature(Ts) Lead Temperature & Time -0.3 ~ 6V -0.3 ~ 6V 125C 450mW 500mW -40C – 85C -55C - 150C 260C, 10S Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect device reliability. ELECTRICAL CHARACTERISTICS (TA=25C) Symbol Vin Parameter Conditions Input Voltage Range Min Typ 0.9 Vstart Startup Voltage Iout = 1mA 0.9 Vhold Hold Voltage Iout = 50mA 0.5 Vout Output Voltage Range Fsoc IQ RdsonP RdsonN Iswlk 1.8 Max Unit 5 V V 0.7 V 5.5 V Output voltage accuracy Iout = 0mA 2 Line regulation Iout = 50mA 0.1 0.2 %/V Load regulation Iout = 0~300mA 1 2 % Switching Frequency Vout=0.95Vo, No inductor 0.7 1 1.4 MHz Max Duty cycle Vout=0.95Vo, No inductor 85 90 95 % Quiescent Current at Vout Vout=1.05*Vo 5 8 15 uA Supply current at Vin Iout = 0mA 20 uA Efficiency PMOS Rdson Iout = 100mA Isw =100mA NMOS Rdson Isw =100mA SW Leakage Current Vout=5.2V, Vsw=0 or 5.2V www.belling.com.cn 2 % 85 % 400 600 mohm 200 300 mohm 1 uA BL8536 PIN DESCRIPTION PIN # SOT23-3 3 1 2 SOT89-3 2 1 3 NAME OUT GND SW DESCRIPTION Output voltage pin, with 10uF ceramic capacitor closely connected to GND Ground To connect inductor to VIN BLOCK DIAGRAM ELECTRICAL PERFORMANCE Tested under Cin=Cout=10uF, L=2.2uH, TA=25C, unless otherwise specified Efficiency vs. Output Current Efficiency vs. Output Current (Vout=3.3V) 100% 100% 90% 90% 80% 80% 70% 70% 60% 60% Efficiency Efficiency (Vout=5.5V) 50% 40% 30% 10% 0% 0.001 0.01 0.1 Vin=1.0V Vin=1.5V Vin=2.0V Vin=2.7V 20% 10% 1 Iout (A) www.belling.com.cn 40% 30% Vin=1.0V Vin=1.5V Vin=3.3V Vin=4.0V 20% 50% 0% 0.001 0.01 0.1 Iout (A) 3 1 BL8536 Efficiency vs. Output Current 100% 80% 80% 60% 60% 40% Vin=1.0V Vin=1.5V Vin=2.0V Vin=2.7V 20% 0% 0.001 0.01 0.1 Iout (A) (Vout=1.8V) 100% Efficiency Efficiency Efficiency vs. Output Current (Vout=3.0V) 1 40% 0% 0.001 10 Output Voltage vs. Output Current 0.01 Iout (A) 0.1 1 Output Voltage vs. Output Current (Vout=5.5V) 6.0 Vin=1.0V Vin=1.2V Vin=1.5V 20% (Vout=3.3V) 4.0 3.5 5.0 3.0 Vout (V) Vout (V) 4.0 3.0 2.0 Vin=1.0V Vin=1.5V Vin=3.3V Vin=4.0V 1.0 0.0 0 0.2 0.4 Iout (A) 0.6 2.5 2.0 1.5 Vin=1.0V Vin=1.5V Vin=2.0V Vin=2.7V 1.0 0.5 0.0 0.8 0 Output Voltage vs. Output Current 0.4 0.6 Iout (A) 0.8 1 Output Voltage vs. Output Current (Vout=3.0V) 3.5 0.2 (Vout=1.8V) 2.0 3.0 1.5 2.0 Vout (V) Vout (V) 2.5 1.5 Vin=1.0V Vin=1.5V Vin=2.0V Vin=2.7V 1.0 0.5 0.0 0 0.2 0.4 0.6 0.8 Iout (A) 1 1.0 0.5 Vin=1.0V Vin=1.2V Vin=1.5V 0.0 1.2 0 Iq vs. Temperature 30 15 Vout(V) Iq(uA) 20 10 5 0 -5 -50 www.belling.com.cn 0 50 Temperature(℃) 0.2 0.3 0.4 Iout (A) 0.5 0.6 Output Voltage vs. Temperature Supply current at Vin Quiescent Current at Vout 25 0.1 100 4 3.5 3.5 3.4 3.4 3.3 3.3 3.2 3.2 3.1 3.1 3.0 Vin=1.0V Vin=2.6V Vin=3.0V -40 0 40 Temperature(℃) 80 120 BL8536 DETAILED DESCRIPTION APPLICATION INFORMATION BL8536 is a low input voltage start up, current mode DC-DC step up converter. It’s operation can be best understood by referring to the block diagram. Upon starting up, the low voltage startup circuitry drives SW with on-off cycles, transferring energy from input to OUT by storing energy in the inductor during on-time and releasing it to the output during off-time. When OUT reaches 2V, the startup circuit turns off and the main controller takes over. The main control loop consists of a reference, a GM error amplifier, a PWM controller, a current sense amplifier, an oscillator, a PWM logic control, and it is power stage including its driver. The main control loop is a classic current mode control loop. The GM stage integrates the error between FB and REF, and its output is used to compare with a triangular wave which the summing result of the current sense amplifier output and a slope compensation voltage. The output of the comparator is used to drive the power stage to reach regulation. Inductor selection www.belling.com.cn With switching frequency up to 1MHz, small surface mount inductors can be used with values from 2.2uH to 4.7uH. For a given chosen inductor value and application conditions make sure the peak inductor current does not exceed the maximum current rating of the selected vendor's inductor. Input and output capacitor selection The BL8536's bootstrap architecture allows the use of very small input capacitor. For applications that only need to drive small output load current, the input capacitor is optional, because once output is started up, the IC's is powered by OUT, a quiet power supply. The output capacitor is used to stabilize the loop and provide ac current to the load. A low ESR ceramic cap with values from 2.2uF to 22uF can be used. Smaller value capacitors are generally cheaper with small footprints, while larger capacitor provides lower ripples and better transient load responses. Also, when extreme low startup voltage is needed, larger output capacitors are needed for the part to startup under heavy load condition. 5 BL8536 PACKAGE OUTLINE Package SOT-23-3 Devices per reel 3000Pcs Unit mm SOT-89-3 Devices per reel 1000Pcs Unit mm Package dimension： Package Package dimension： www.belling.com.cn 6