Regulators ICs for Digital Cameras and Camcorders System Switching Regulator IC with Built-in FET (10V) No.11036EAT20 BD8355MWV Description BD8355MWV is a system switching regulator for Li 2 cell composed of 6 step-down synchronous rectification channels and 1 step-up Di rectification channel for LED application. Using a charge-pump system for high side FET driver and including power MOSFET reduce the number of peripheral devices and realize high efficiency. Functions 1) Includes step-down 6 CH (CH1~6), step-up for LED 1CH (7CH) total 7CH included. 2) Includes Power MOSFET for all channels. 3) Includes Charge-pump circuit for high side driver. 4) Operating frequency of 750 kHz. 5) CH1 and 4 are common, 3 and 5 are also common, and others are possible to turn ON/OFF independently. 6) Includes Short Circuit Protection (SCP), Under Voltage Lock Out (UVLO) and Thermal Shut Down (TSD). 7) Includes Short Circuit Protection for CH6 (SCP6). 8) Includes Over Voltage Protection for CH7. 9) Thermally enhanced UQFN056V7070 package (7mm7mm, 0.4mm pitch) Applications For digital single-lens reflex camera, digital video camera Absolute maximum ratingsTa25 Parameter Symbol Ratings Unit VCC, VBAT, VHx1~6 -0.3~11.0 V VLx1~6 -0.3~VHx V VLx7 -0.3~28.0 V Power Supply Voltage HVREG -0.3~15.0 V CTL14, CTL2, -0.3~11.0 V CTL35, CTL6 CTL7 -0.3~7.0 V IomaxLx1, Lx4, Lx5 1.5 A IomaxLx2, Lx3 0.8 A Maximum Current IomaxLx6 2.0 A IomaxLx7 +1.0 A 420 (*1) mW Power Dissipation Pd 930 (*2) mW Operating Temperature Topr -25~+85 Storage Temperature Tstg -55~+125 Junction Temperature Tjmax 125 *1 Without external heat sink, power dissipation degrades by 4.2mW/ above 25. *2 Power dissipation degrades by 9.3mW/ above 25, when mounted on a 74.2mm74.2mm1.6mmt grass epoxy PCB. www.rohm.com 2011.12 - Rev.A 1/20 2011 ROHM Co., Ltd. All rights reserved. Technical Note BD8355MWV Recommended Operating Conditions(Ta=-25~+85) Ratings Parameter Symbol Unit Min. Typ. Max. Power Supply Voltage VCC, VBAT, VHx1~6 4.0 7.2 10.0 V VREGA Output Capacitor CVREGA 0.47 1.0 2.2 F VREGD Output Capacitor CVREGD 0.47 1.0 2.2 F CHVREG 0.47 1.0 2.2 F HVREG Output Capacitor Flying Capacitor CFLY 0.0470.1 0.22 F Oscillator Frequency Fosc 500 750 1800kHz Timing Resistor RRT 15 47 82 k Electrical Characteristics(Ta=25,Vcc=VBAT=7.2V, fosc=750kHz with no designation) Limits Parameter Symbol Unit Conditions Min. Typ. Max. Reference Voltage VREGA Output Voltage VREGA 3.54 3.60 3.66 V VREGA=-1mA Line Regulation DVli - - 10 mV VCC=4V~10V, VREGA=-1mA Load Regulation DVlo - - 10 mV VREGA=-1mA~-5mA Bias Voltage VREGD Output Voltage VREGD 3.50 3.60 3.70 V VREGD=-10mA Charge Pump VBAT VBAT HVREG Output Voltage HVREG - V Iout=0mA, FB=2.5V +3.50 +3.60 Output Impedance RHVREG - 24 40 Iout=-30mA, CFLY=0.1F Oscillator Oscillator Frequency fosc 650 750 850 kHz RT=47k Oscillator Frequency cofficient Df - 0 2 % VCC=4V~10V PWM Comparator CH7 0% Duty Threshold Voltage Vth0 0.2 0.3 - V CH7 Max Duty Dmax 86 92 96 % Error Amplifier 1(CH1) Threshold Voltage Veth1 0.790 0.800 0.810 V Output Voltage L VFBL1 - 0.03 0.2 V INV1=0.9V Output Voltage H VFBH1 3.3 3.5 - V INV1=0.7V Output Sink Current Isink1 4.0 17.0 - mA INV1=0.9V, FB1=1.75V Output Source Current Isource1 - -140 -70 A INV1=0.7V, FB1=1.75V Input Bias Current Ibias1 -100 0 100 nA INV1=0V Error Amplifier 2(CH2~6) Threshold Voltage Veth 0.990 1.000 1.010 V Output Voltage L VFBL - 0.03 0.2 V INV=1.1V Output Voltage H VFBH 3.3 3.5 - V INV=0.9V Output Sink Current Isink 4.0 17.0 - mA INV=1.1V, FB=1.75V Output Source Current Isource - -140 -70 A INV=0.9V, FB=1.75V Input Bias Current Ibias -100 0 100 nA INV=0V Error Amplifier 3(CH7) Threshold Voltage Veth7 0.285 0.300 0.315 V Output Voltage L VFBL7 - 0.03 0.2 V INV=0.4V Output Voltage H VFBH7 3.3 3.5 - V INV=0.2V Output Sink Current Isink7 4.0 17.0 - mA INV=0.4V, FB=1.75V Output Source Current Isource7 - -140 -70 A INV=0.2V, FB=1.75V Input Bias Current Ibias7 -50 0 50 nA INV7=0V www.rohm.com 2011.12 - Rev.A 2/20 2011 ROHM Co., Ltd. All rights reserved.