Advanced Power Electronics Corp. APE1723-HF-3 200kHz, 1A PWM Buck DC/DC Converter Features Description Adjustable Output Voltage: The APE1723 series are monolithic ICs designed as a From 0.745V to 24V step-down DC/DC converter, and have the ability to drive a 1A load without an external transistor, saving board space. Fixed switching frequency of 200kHz The external shutdown function can be controlled with logic level signals to put the device into standby mode. The internal Thermal-shutdown and current-limit protection. compensation provides feedback control for good line and ON/OFF shutdown control input. load regulation without external components. Thermal shutdown is provided to prevent damage from Short Circuit Protection (SCP). over-temperature operation, and current limiting is available to protect the output switch. If the APE1723s VFB is taken Operating voltage up to 26V. below 0.5V, the switching frequency will be reduced. Output load current up to 1A. The APE1723 operates at a fixed switching frequency of 200kHz allowing smaller sized filter components. Other features Low-power standby mode. include a guaranteed 3% tolerance on output voltage under specified input voltage and output load conditions. Built-in switching transistor on chip. The APE1723 is available in a SOT-23-5 or SO-8 package. SO-8 or 5-Lead SOT-23 packages RoHS-compliant, halogen-free. Typical Application Vout=5V/1A L1 VIN=12V U1 (Refer to table 1) APE1723 R1 1 5 6.8k VIN SW R3 D1 100k C1 C3 C6 C2 B140A 0.1uF R2 100uF 220uF 0.1uF 4 3 1.2k EN FB 2 Vss ON/OFF C4 0.1uF V = V x (1+R1/R2) , V = 0.745V, R2 = 0.75kW ~4kW OUT FB FB Ordering information Packing Type: APE1723XX-HF-3TR TR: Tape and reel Package Type: M: SO-8 Y5 : SOT-23-5 Examples: APE1723M-HF-3TR in RoHS-compliant, halogen-free SO-8, shipped on tape and reel (3000 pcs/reel). APE1723Y5-HF-3TR in RoHS-compliant, halogen-free SOT23-5, shipped on tape and reel (3000 pcs/reel). 2010 Advanced Power Electronics Corp. USA 200812231-3 1/11 www.a-powerusa.comAdvanced Power Electronics Corp. APE1723-HF-3 Absolute Maximum Ratings (at T = 25C) A Maximum Supply Voltage(V ) -------------------------- +30V IN Feedback PIN Voltage(V ) ----------------------------- -0.3V to 12V FB ON/OFF PIN Voltage(V ) ------------------------------- -0.3V to V EN IN Output Voltage to Ground(V ) ------------------------ -0.8V OUT Power Dissipation(P ) ------------------------------------- (T -T )/Rth W D J A JA Storage Temperature Range(T ) --------------------- -65C To 150C ST Operating Junction Temperature Range(T ) ----- -40C To 125C OPJ Operating Supply Voltage(V ) ------------------------- +4.5V to 26V OP Thermal Resistance from Junction to Case(Rth ) JC SO-8 50C/W SOT-23-5 180C/W Thermal Resistance from Junction to Ambient(Rth ) JA SO-8 120C/W SOT-23-5 250C/W 2 Note. Rth is measured with the PCB copper area (must be connected to V pins) of approx. 1.5 in (multi-layer) JA SS Electrical Characteristics (V =12V, V =3.3V, I =0.3A, T =25C, unless otherwise specified) CC OUT LOAD A UNITS Parameter SYM TEST CONDITION MIN TYP MAX Feedback Voltage V I =0.3A 0.723 0.745 0.767 V FB OUT Quiescent Current I V =1.2V force driver off - 3.5 6 mA Q FB Feedback Bias Current I I =0.1A - -10 -50 nA FB OUT Shutdown Supply Current I V =0V - 2 10 uA SD EN Oscillator Frequency F 140 200 260 kHz OSC Oscillator Frequency of F (Adjustable) When V <0.5V - 50 - kHz SCP FB Short-Circuit Protection Max. Duty Cycle (ON) V =1.2V force driver off - 0 - FB DC % Min. Duty Cycle (OFF) V =0V force driver on - 100 - FB Pear current, No outside circuit I Current Limit 1.2 - -A LIMIT V =0V force driver on FB I =1A, No outside circuit OUT V Saturation Voltage - 1.2 1.5 V SA T V =0V force driver on FB SW Pin=0V V =26V, No outside circuit - - -200 uA SW Pin Leakage IN I SWL current SW Pin=-0.8V V =1.0V force driver off - -5 - mA FB V High (regulator ON) - 2 EN Pin Logic Input Threshold IH - V Voltage V Low (regulator OFF) 0.5 - IL -20 - EN Pin Logic Input Current I V =2.5V (ON) H EN uA --5 - EN Pin Input Current I V =0.3V (OFF) L EN Thermal Shutdown Temp TSD - 145 - C THIS PRODUCT IS SENSITIVE TO ELECTROSTATIC DISCHARGE, PLEASE HANDLE WITH CAUTION. USE OF THIS PRODUCT AS A CRITICAL COMPONENT IN LIFE SUPPORT OR OTHER SIMILAR SYSTEMS IS NOT AUTHORIZED. APEC DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. APEC RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. 2010 Advanced Power Electronics Corp. USA 2/11 www.a-powerusa.com