Large Current External FET Controller Type Switching Regulators Step-down,High-efficiency Switching Regulators (Controller type) No.10028EAT15 BD9018KV Overview The BD9018KV is a 2-ch synchronous controller with rectification switching for enhanced power management efficiency. It supports a wide input range and leads to eco-design (low power consumption) for various electronics. Features 1) Wide input voltage range: 3.9V30V 2) Precision voltage references: 0.8V1% 3) FET direct drive 4) Rectification switching for increased efficiency 5) Variable frequency: 250k550kHz (external synchronization to 600kHz) 6) Built-in auto-recovery over-current protection 7) Separate enable-pins per CH for individual power up/down control 8) Supports various applications: step-down, step-up, and step-up-down 9) Small footprint packages: VQFP48C 10) When operating at Max Duty, the switching frequency slows down to 1/5 to reduce input/output difference. Applications Car audio and navigation systems, CRTTVLCDTVPDPTVSTBDVDand PC systemsportable CD and DVD players, etc. Absolute Maximum Ratings (Ta=25) Parameter Symbol RatingUnit Parameter Symbol Rating Unit *1 VCC Voltage VCC 35 V PGOOD Voltage PGOOD 7 V *1 EXTVCC Voltage EXTVCC 35 V SS1,2 Voltage SS1,2 *1 VCCCL1,2 Voltage VCCCL1,2 35 V FB1,2 Voltage FB1,2 CL1,2 Voltage CL1,2 35 V COMP1,2 Voltage COMP1,2 VREG5 V *1 SW1,2 Voltage SW1,2 35 V RT Voltage RT *1 BOOT1,2 Voltage BOOT1,2 40 V SYNC Voltage SYNC *2 Power Dissipation Pd 1.1 W BOOT1,2-SW1,2 *1 BOOT1,2-SW1,2 7 V Operating Voltage Topr -40+85 temperature EN1,2 Voltage EN1,2 EXTVCC V Storage temperature Tstg -55+150 Junction VREG5,5A VREG5,5A 7 V Tj +150 temperature *1 Regardless of the listed rating, do not exceed Pd in any circumstances. *2 Mounted on a 70mm x 70mm x 1.6mm glass-epoxy board. Reduce by 8.8mW/ (VQFP48C) above 25. www.rohm.com 2010.02 - Rev.A 1/16 c 2010 ROHM Co., Ltd. All rights reserved. Technical Note BD9018KV Recommend operating range (Ta=25) Parameter Symbol Min. Typ. Max. Unit *1 *2 Input voltage 1 VCC,EXTVCC 3.9 12 30 V *1 *2 Input voltage 2 VCCCL 3 12 VCC V BOOTSW voltage BOOTSW 3.9 5 VREG5 V Oscillator frequency OSC 250 300 550 kHz *2 Synchronous frequency SYNC OSC - 600 kHz Synchronous frequency Ton 0.2 1/(2SYNC) - sec pulse width (ON Time) Synchronous frequency Toff 0.2 1/(2SYNC) - sec pulse width (OFF Time) *1 In case of using less than 6V, Short VCC, EXTVCC and VREG5. Moreover, it is the voltage range when 4.5V or greater is once supplied to the input. *2 Should not exceed OSC2 This product is not designed to provide resistance against radiation. Electrical characteristics (Unless otherwise specified, Ta=25 VCC=12V STB=5V EN1,2=5V) Limit Parameter Symbol Unit Conditions Min. Typ. Max. VIN bias current IIN - 5 10 mA Shutdown mode current IST - 0 10 A EN1,EN2=0V , VREG5 OFF When each EN is OFF, EN1,2 low voltage VENth1 GND - 1.0 V each ch is OFF When EN is ON, EN1,2 high voltage VENth2 2.6 - Vcc V each ch is ON EN1,2 input current IEN 12 23 48 A VEN=5V VREG5 Block VREG5 output voltage VREG5 4.7 4.95 5.2 V IREF=6mA Under Voltage Lock Out Block VREG5 threshold voltage VREG UVLO 3.5 3.7 3.9 V VREG:Sweep down VREG5 hysteresis voltage DVREG UVLO 100 200 400 mV VREG:Sweep up Oscillator Oscillator frequency FOSC 270 300 330 kHz RT=100 k Synchronous frequency Fsync - 500 - kHz RT=100 k,SYNC=500kHz SYNC pulse low voltage Vsynclow GNC - 0.5 V SYNC pulse high voltage Vsynchigh 2.5 - 7 V SYNC input current Isync 10 20 40 A Vsync=5V Error Amp Block VO input bias current IVo+ - - 1 A Feedback reference voltage VOB 0.792 0.800 0.808 V Soft start block Charge current ISS 6.5 10 13.5 A VSS=1V Discharge current IDIS 0.6 1.7 3 mA VSS=1V,VCC=3V Maximum voltage Vss MAX 2.05 2.25 2.45 V Standby voltage Vss STB - - 0.3 V VCC=0.3V Over Current Protection Block CL threshold voltage Vswth 70 90 110 V CL input current 1,2 Iswin - - 10 A Output short detection voltage Vosh 0.46 0.56 0.66 V VFB Output short release voltage Vodet 0.51 0.61 0.71 V VFB PGOOD PGOOD output L current IPGOODL 0.56 0.7 - mA PGOOD=1V,FB=0V PGOOD output H current IPGOODH - 0 3 A PGOOD=5V Over voltage detection voltage VFBO 0.874 0.92 0.966 V VFB www.rohm.com 2010.02 - Rev.A 2/16 c 2010 ROHM Co., Ltd. All rights reserved.