BD9846FV-E2 ROHM

1/4 STRUCTURE Silicon Monolithic Integrated Circuit PRODUCTSERIES 2-ch Switching Regulator Controller TYPE BD9846FV FEATURES High Input-voltage ( Vcc=35V) MOSFET-driver circuit built-indual circuit for step-down output Built-in circuits for error amplifier reference voltage (ch1:eternal regulation is possible , ch2:1.0 V1%) Over current detection circuit built-in. Soft-start timing adjustable Absolute maximum ratingsTa=25 Item Symbol Limits Unit Power Supply Voltage Vcc 36 V 1 Power dissipation Pd 812 mW Output pin voltage VOUT Vcc-7VVcc V C5V pin voltage VC5V Vcc-7VVcc V Operating temperature Topr -40+105 Storage temperature Tstg -55+150 Maximum Junction temperature Tjmax 150 *1 Should be deleted by 6.5mW/ at Ta=25 or more. When mounted on a glass epoxy PCB of 70.0mm70.0 mm1.6 mm Recommended operating range (Ta=25) Item Symbol Min. Typ. Max. Unit Power Supply Voltage Vcc 3.6 6.0 35 V VOUT C5V - Vcc V Output pin voltage Error amplifier input voltage VERRIN 0 - 1.6 V CCT 47 - 3000 pF Timing capacitor fosc 100 - 1500 kHz Oscillation frequency STB input voltage VSTB 0 - VCC V Electrical characteristics (Unless otherwise specified, Ta=25VCC=6V) Limits Item Symbol MaxUnit Conditions Min. Typ VREF output block 2.47 2.50 2.52 VREF output voltage VREF V IO=0.1mA 5 0 5 Line regulation Line reg. 1 10 mV Vcc=3.6V35V Load regulation Load reg. 2 10 mV IO=0.1mA2mA Output max. current IOMAX 2 13 mA VREF=(typ.)0.95 REV. A 2/4 Electrical characteristics (Unless otherwise specified, Ta=25VCC=6V) limits Item Symbol Unit Conditions Min. Typ. Max. Triangular wave oscillator block fOSC 95 106 117 kHz CCP=1800pF Oscillation frequency fDV 0 1 % Vcc=3.6V35V Frequency variation Soft-start block ISSSO 1.4 2 2.6 A SS=0.5V SS pin source current ISSSI 5 12 mA SS=0.5V SS pin sink current Dead time adjustable circuit block IDT 0.1 1 A DT=1.75V DT pin input bias current IDTSI 1 3.3 mA DT=1.75V, (OCP+)-(OCP-)=0.5V DT pin sink current UVLO block VUTH 3.0 3.2 3.4 V Vcc when rise time Threshold voltage VUHYS 0.15 0.25 V Hysterisis Error Amp block Inon 0 1 A NON=1V NON input bias current (ch1) VINV 0.99 1 1.01 V INV=FB Non-Inverting input reference voltage(ch2) dVinv 1 6 mV Vcc=3.6V35V Reference voltage variation (ch2) IIB 0 1 A INV=1V INV input bias current AV 70 85 dB Open loop gain VFBH 2.30 VREF V Output FB voltage (Hi) VFBL 0.6 1.3 V Output FB voltage (Low) IFBSI 0.5 1.5 mA FB=1.25V , INV=1.5V Output sink current IFBSO 50 105 A FB=1.25V , INV=0V Output source current PWM comparator Input threshold voltage Vt0 1.4 1.5 1.6 V On duty 0% fosc=100kHz Vt100 1.9 2 2.1 V On duty 100% Output block RONH 4 10 RONH=( VCC -OUT)/ Iout, Iout=0.1A Output ON resistance H RONL 3.3 10 RONL=(OUT-C5V)/ Iout, Iout=0.1A Output ON resistance L VCLMP 4.5 5 5.5 V VCLMP= VCC-C5V , VCC 7V C5V clamp voltage Over current protection circuit (OCP) block VOCPTH 0.04 0.05 0.06 V Voltage between (OCP+)-(OCP-) OCP threshold voltage OCP-input bias current IOCP- 0.1 10 A OCP+= VCC, OCP-= VCC-0.05V tdocpth 200 400 nS OCP-= VCCVCC-0.2V Delay time for OCP Min. hold time for OCP tdocpre 0.8 1.6 mS OCP-= VCC-0.2VVCC Stand-by switch block Threshold voltage for each CH stop VDTthL 1.1 1.25 1.4 V DT Pin H/L VSTBL 0 0.5 V Stand-by mode setting voltage range VSTBH 3 VCC V Active setting voltage range STB current ISTB 70 100 A STB=6V Total device Stand-by current ICCS 0 1 A STB=0V ICCA 1.5 3 6 mA INV=0V, FB=H, DT=1.75V Average current consumption Not designed for radiation resistance. REV. A