BD9853AFV-E2 ROHM

Large Current External FET Controller Type Switching Regulators Single/Dual-output High-frequency Step-down Switching Regulator(Controller type) No.09028EAT05 BD9853AFV Description The BD9853AFV is a 2-ch synchronous DC/DC controller that can operate at a maximum switching frequency of 2MHz, enabling the use of a smaller external coil than conventional lower-frequency switching regulators. This makes the BD9853AFV a suitable choice for downsizing applications. Features 1) Synchronous Switching Regulator Controller 2channels 2) FET(Pch/Nch) Direct Drive 3) Adjustable Oscillator Frequency with External Resistor (Max. 2MHz) 4) Under Voltage Lockout Function (UVLO) 5) Thermal Shut Down Function (TSD) 6) Short Circuit Protection (SCP) 7) Independent ON/OFF Function in Each Channel with Soft Start Pin 8) SSOP-B16 Package SSOPB16 Applications TVSTB, PC, Portable CDDVD,DVC etc. Absolute Maximum Ratings (Ta = 25) Parameter Symbol Limits Unit Supply Voltage (VCC-GND) Vcc 18 V VREGA-GND Voltage VREGA 7 V VCC-VREGB Voltage VREGB 7 V Power Dissipation Pd 562(*1) mW Operating Temperature Range Topr -40 to +85 Junction Temperature Tjmax +150 Storage Temperature Range Tstg -55 to +150 * Reduced by 4.49mW for each increase in Ta of 1 over 25 (When mounted on a board 70701.6tmm grass-epoxy PCB) Recommended Operating Conditions Limits Parameter Symbol Unit Min. Typ. Max. Supply Voltage Vcc 4.5 12 16 V Oscillator Frequency fosc 100 1000 2000 KHz www.rohm.com 1/16 2009.05 - Rev.A 2009 ROHM Co., Ltd. All rights reserved. Technical Note BD9853AFV Electrical Characteristics (Unless otherwise specified Ta=25,Vcc=12V,fosc=1000kHz,STB=3V) Limits Parameter Symbol Unit Conditions Min. Typ. Max. Whole Device Standby Current Iccst 0 5 ASTB=0V Circuit Current Icc 3.2 5.2 mAINV1,INV2=2.5V Regulator for Driver REGA Output Voltage Vrega 4.5 5.0 5.5 V Output Current Capability Irega -100 mA Vrega > 4.5V Regulator for Driver REGB Output Voltage Vregb V -5.5 V -5.0 V -4.5 V CC CC CC Output Current Capability Iregb 100 mA Vregb < Vcc-4.5V Oscillator RRT=8.2k Oscillator Frequency fosc 900 1000 1100 kHz OUTH=2200pF,OUTL=1000pF Oscillator Frequency Coefficient1 Dfosc1 -2 0 2 % Vcc=4.5 to 5V Oscillator Frequency Coefficient2 Dfosc2 -2 0 2 % Vcc=5 to 18V Error Amplifier Threshold Voltage Vthea 0.79 0.80 0.81 V Input Bias Current Ibias -230 -115 nA Voltage Gain Av 60 80 100 dB DC GAIN Max. Output Voltage Vfbh Vrega-0.85 V Min. Output Voltage Vfbl 0.85 V Output Sink Current Isink 2 11 - mA INV=2.5V, FB=2.5V Output Source Current Isource - -15 -2 mA INV=0V, FB=2.5V PWM Comparator 0% Threshold Voltage Vth0 1.4 1.5 1.6 V FB Voltage 100% Threshold Voltage Vth100 2.4 2.5 2.6 V FB Voltage * This product is not designed for the protection against radioactive rays. ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM www.rohm.com 2/16 2009.05 - Rev.A 2009 ROHM Co., Ltd. All rights reserved.