BM0246A BOOKLY | Alldatasheet

Document overview

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Technical content

White LED Step-Up Converter ※ www.bookly.com ※ Page 1 of 8 ¾ OverVoltage Function ¾ Fast 1.4MHz Switching Frequency ¾ Requires Only 0.22uF Output Capacitor ¾ Inherently Matched LED Current ¾ High Efficiency: 90% Typical ¾ 2.5V to 16V V IN ranges ¾ Drives Up to Four series LEDs with a Li-lon cell ¾ PIN TO PIN with RT9271 and AIC1896 , D246 ¾ SOT-26 Package BM0246A is a step-up DC/DC converter specifically designed to drive white LED with a constant current. It can drive two,three,or four LEDS. It switches at 1.4MHz and use tiny external components. The output capacitor can be as small as 0.22uF,which can save space and cost versus alternative solutions. Feedback voltage is as low as 105mV. Built-in OverVoltage function. Absolute maximum ratings Parameter symbol value unit Supply Voltage VIN 15 V Feedback Voltage FB 10 V Switch Voltage SW 30 V CE Voltage VCE 10 V Operating temperature range Topr -25 to +85 ℃ Storage temperature range Rstg -55 to +150 ℃ Junction temperature Tj 125 ℃ Pin name Description Symbol Description Symbol 1：Switch SW 6：Supply Volt age VIN 2：GND GND 5：O v e r Volt age OVP 3 4 3：Feedback FB 4：Start-Up CE BOOST IC (LED DRIVER) BM0246A

PIN6(VIN) PIN4 SHUTDOWN SENSECURRENT Fosc PIN3(FB) COMP PIN1(SW) PIN5(OVP) PIN2(GND) SLOPE VREF gm BM0246 ※ www.bookly.com ※ Page 2 of 8 BOOST IC (LED DRIVER) BM0246A

Electrical Characteristics

Tamb = 25 , ℃ VIN=3V，VCE=3V,unless otherwise specified. Parameter Test Conditions / Pins Min Type Max Unit Minimum Operating Voltage 2.5 V Maximum Operating Voltage 10 V Feedback Voltage ISW=100mA, Duty Cycle=66% 104 115 126 mV FB Pin Bias Current 50 100 200 nA Supply Current VCE=0V 1.9 0.1 2.5 mA uA Switching Frequency 0.8 1.0 1.2 MHz Maximum Duty Cycle 85 90 % OVP Protection 21 V Switch Current Limit 320 mA Switch VCESAT ISW =250mA 350 mV Switch Leakage Current VSW=5V 0.01 5 uA CE Voltage High 1.5 V CE Voltage Low 0.4 V CE Pin Bias Current 65 uA Typical Application 1 2 PIN3(FB) PIN1(SW) 22uH 1 2 VCC PIN4 gm CONTROL SENSE Fosc PWM VREF SLOPE PIN2(GND) 0.22u PIN5(OVP) SHUTDOWN CURRENT PIN6(VIN) HI COMP ※ www.bookly.com ※ Page 3 of 8 BOOST IC (LED DRIVER) BM0246A

Analog Voltage Light Control SHUTDOWN 1 2 PIN3(FB) 22uH 1 2 SENSE PIN6(VIN) SLOPE PWM VDC VREF COMP PIN4 PIN5(OVP) 0.22u+ CURRENT VCC PIN1(SW) HI 90K gm PIN2(GND) D1 HI CONTROL Fosc Logic Voltage Light Control PWM PIN5(OVP) HI 1 2 Fosc HI 22uH 1 2 VCC VREF PWM PIN6(VIN) SENSE PIN3(FB) PIN2(GND)+ PIN1(SW) SLOPE+ SHUTDOWN CONTROL 0.22u gm COMP CURRENT PIN4 ※ www.bookly.com ※ Page 4 of 8 BOOST IC (LED DRIVER) BM0246A

0.2 0.4 0.6 0.8 1.2 1.4 -25 0 25 50 75 100 T（°C） Swich Frequency（MHz） Iq Vs T 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 02468 1 0 Vin(V) Iq(mA) -50 100 ※ www.bookly.com ※ Page 5 of 8 BOOST IC (LED DRIVER) BM0246A

η VS T 80.5 81.5 82.5 83.5 84.5 -25 0 25 50 75 100 T（°C） η（%） ILED=10mA ILED=15mA ILED=20mA Drive 2LED 0 1 02 03 04 0 ILED(mA) η（%） Vin=3.6V Vin=3V ※ www.bookly.com ※ Page 6 of 8 BOOST IC (LED DRIVER) BM0246A

ILED（mA） η（%） Vin=3V Vin=3.6V ※ www.bookly.com ※ Page 7 of 8 BOOST IC (LED DRIVER) BM0246A

Dimension(in mm) Dimension(in Inch) Symbol min max min max A 0.787 1.450 0.031 0.057 A1 0.152 0.006 B 1.397 1.803 0.055 0.071 b 0.250 0.559 0.010 0.022 C 2.591 2.997 0.102 0.118 D 2.692 3.099 0.106 0.122 E 0.838 1.041 0.033 0.041 H 0.080 0.254 0.003 0.010 L 0.300 0.610 0.012 0.024 ※ www.bookly.com ※ Page 8 of 8 BOOST IC (LED DRIVER) BM0246A