TECHNICAL NOTE Large Current External FET Controller Type Switching Regulator Dual-output, high voltage, high-efficiency step-down switching controller BD9012KV Overview The BD9012KV is a 2-ch synchronous controller with rectification switching for enhanced power management efficiency. It supports a wide input range, enabling low power consumption ecodesign for an array of electronics. Features 1) Wide input voltage range: 4.5V to 30V 2) Precision voltage references: 0.8V1% 3) FET direct drive 4) Rectification switching for increased efficiency 5) Variable frequency: 250k to 1200kHz (external synchronization to 1200kHz) 6) Built-in selected auto remove over current protection 7) Built-in independent power up/power down sequencing control 8) Make various application , step-down , step-up and step-up-down 9) Small footprint packages: VQFP48C Applications Car audio and navigation systems, CRTTVLCDTVPDPTVSTBDVDand PC systemsportable CD and DVD players, etc. Absolute Maximum Ratings (Ta=25) Parameter Symbol Parameter Symbol Limits Unit Limits Unit VCC Voltage VCC VREG33 Voltage VREG33 34 *1 V SS1,2FB1,2 EXTVCC Voltage EXTVCC SS1,2FB1,2 34 *1 V Voltage VREG5 V VCCCL1,2 Voltage VCCCL1,2 COMP1,2 Voltage COMP1,2 34 V CL1,2 Voltage CL1,2 DET1,2 Voltage DET1,2 34 V SW1,2 Voltage SW1,2 RTSYNC Voltage RTSYNC 34 *1 V BOOT1,2 Voltage BOOT1,2 Power Dissipation Pd 40 *1 V 1.1 *2 W BOOT1,2-SW1,2 BOOT1,2 Operating Topr 7 *1 V -40 to +105 Voltage -SW1,2 Temperature Range Storage Temperature STB, EN1,2 Voltage STB, EN1,2 Tstg VCC V -55 to +150 Range Maximum Junction VREG5,5A Voltage VREG5,5A 7 *1 V Tj +150 Temperature *1 Regardless of the listed rating, do not exceed Pd in any circumstances. *2 Pd de-rated at 7mW/ for temperature above Ta=25, Mounted on PCB 70mm70mm1.6mm. Apr.2008 Operating conditions (Ta=25) Parameter Symbol Min. Typ. Max. Unit *1 *2 Input voltage 1 EXTVCC 4.5 12 30 V *1 *2 Input voltage 2 VCC 4.5 12 30 V BOOTSW voltage BOOTSW 4.5 5 VREG5 V Carrier frequency OSC 250 300 1200 kHz *3*4 Synchronous frequency SYNC OSC - 1200 kHz Synchronous pulse duty Duty 40 50 60 Min OFF pulse TMIN - 150 - nsec This product is not designed to provide resistance against radiation. *1 After more than 4.5V, voltage range. *2 In case of using less than 6V, Short to VCC, EXTVCC and VREG5. *3 Please do not exceed OSC1.5. *4 Do not do such things as switching over to internal oscillating frequency while external synchronization frequency is used. 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 - 6 10 mA Shutdown mode current IST - 0 10 A VSTB=0V Error Amp Block Feedback reference voltage VOB 0.792 0.800 0.808 V Feedback reference voltage VOB+ 0.784 0.800 0.816 V Ta=-40 to 105 (Ta=-40 to 105) Open circuit voltage gain Averr - 46 - dB VO input bias current IVo+ - - 1 A Oscillator Carrier frequency FOSC 900 1000 1100 kHz RT=27 k Synchronous frequency Fsync - 1200 - kHz RT=27 k,SYNC=1200kHz Over Current Protection Block CL threshold voltage Vswth 70 90 110 V CL threshold voltage Vswth+ 67 90 113 V Ta=-40 to 105 Ta=-40 to 105 VREG Block VREG5 output voltage VREG5 4.8 5 5.2 V IREF=6mA VREG33 reference voltage VREG33 3.0 3.3 3.6 V IREG=6mA VREG5 threshold voltage VREG UVLO 2.6 2.8 3.0 V VREG:Sweep down VREG5 hysteresis voltage DVREG UVLO 50 100 200 mV VREG:Sweep up Soft start block Charge current ISS 6.5 10 13.5 A VSS=1V Charge current ISS+ 6 10 14 A VSS=1V,Ta=-40 to 105 (Ta=-40 to 105) Note: Not all shipped products are subject to outgoing inspection. 2/16