TECHNICAL NOTE Power Management for Mobile Phones ESD Resistance Power Management IC Now available for Battery Charger BD6550G z Description The BD6550G is a compact constant-current and constant-voltage controller, incorporating built-in high-precision reference voltage and two OPamp circuits. It is ideal for use in secondary-side controllers for battery chargers. z Features 1) Constant-current and constant-voltage controller 2) Power supply voltage range: 2.5 V to 12 V 3) High-precision reference voltage: 1.21 V 1% 4) Current detection voltage precision: 2% 5) Package: SSOP6 z Applications The BD6550G is designed for use in secondary-side controllers for battery chargers and similar devices. z Absolute maximum ratings (Ta = 25C) Parameter Symbol Limit Unit Power supply voltage VMAX -0.3 to 14 V ICT pin maximum voltage VICTMAX -0.3 to VCC V *1 Power dissipation Pd 675 mW Operating temperature range Topr 0 to +85 C Storage temperature range Tstg -55 to +150 C *1: Reduced by 5.4 mW/C over 25C, when mounted on a PCB (70 mm 70 mm 1.6 mm, glass epoxy). z Recommended operating ranges Parameter Symbol Limit Unit Power supply voltage VCC 2.5 to 12 V Ver.B Oct.2005 z Electrical Characteristics (Unless otherwise specified, Ta = 25C, Vcc = +5 V) Limit Parameter Symbol Unit Conditions Min. Typ. Max. Total current consumption Total supply current - not including output sink ICC - 0.9 2 mA current Voltage control loop Transconduction gain (VCT). *1 GMV 1 4.0 - mA/mV Sink current only 1.198 1.21 1.222 Ta = 25C Voltage control loop reference at 1.5 mA VREF V sinking current *1 1.186 1.21 1.234 0 < Ta < 85C *1 Input bias current (VCT) Ibv - 50 - nA Current control loop Transconduction gain (ICT). *1 GMI 1.5 4.0 - mA/mV Sink current only 196 200 204 Ta = 25C Current control loop reference at 2.5 mA VSE mV *1 sinking current 192 200 208 0 < Ta < 85C Current out of pin ICT at 200 mV Ibi - 25 - A Output stage VSE = 0 V, Low output voltage at 10 mA sinking current VOL - 200 - mV ICT = -0.3 V Output short circuit current, output to Vcc, OUT = VCC, VSE = 0 V, IOS - 20 50 mA sink current only ICT = -0.3 V This product is not designed for protection against radioactive rays. *1: Design guarantee. z Test circuit Vcc VCC Io A 1F Vcc VCC 6 V 1.210V OUT + 3 - VOLTAGE VCT REFERENCE 1 + GND - 2 45 ICT VSE Fig. 1 2/8