ACE150X

                                                                                         ACE150X                                               Technology Description 150KHz,2A, PWM Step-Down DC/DC Converter The ACE150x series are monolithic IC designed for a step-down DC/DC converter, and own the ability of driving 2A load without additional transistor. It saves board space. The Internal compensation makes feedback control having good line and load regulation without external design. Regarding protected function, thermal shutdown is to prevent over temperature operating from damage, and current limit is against over current operating of the output switch. If current limit function occurs and VFB is down below 0.5V, the switching frequency will be reduced. The ACE150x series operate at a switching frequency of 150KHz. Other features include a guaranteed +4% tolerance on output voltage under specified input voltage and output load conditions, and +15% on the oscillator frequency. The output version included fixed 3.3V, 5V, 12V, and an adjustable type. The chips are available in a standard 8-lead SOP-8 package.. Features • • • • • • • • Guaranteed 2A output current 3.3V, 5V, 12V and adjustable output versions Thermal shutdown and current limit protection Internal oscillator of 150kHz fixed frequency. Built-in TTL On/Off control Application One Channel switching regulators LCD Monitors High-efficiency step-down regulator Absolute Maximum Ratings Parameter Input supply voltage ON/OFF Pin Input Voltage Feedback Pin Voltage Output Voltage to Ground Power Dissipation Thermal resistance junction to ambient SOP-8 Operating junction temperature Storage temperature range Operating temperature into, negative out of the specified terminal. Symbol Max Unit VCC 24 V VSD -0.3 to +18 V VFB -0.3 to +18 V VOUT -1 V PD Internally Limited W θJA TJ TSTG TOPR 70 150 - 60 to 150 -40 to +125 O C/W O O C C O C Note : Exceeding these rating could cause damage to the device. All voltages are with respect to Ground. Currents are positive VER 1.2 1                                                                                          ACE150X                                               Technology Packaging Type SOP-8 (ACE1502XXFM+) Vin Vout FB SHDN GND GND GND GND 150KHz,2A ,PWM Step-Down DC/DC Converter SOP-8 (ACE1501XXFM+) NC Vin Vout FB GND GND GND GND Pin Description Selection Guide ACE150 X XX XX + H Halogen - free Pb - free FM : SOP-8 Output Voltage:  3.3V/5.0V/12V/ADJ Pin Power Dissipation Table Package FM TA=70 OC TA= 85 OC θJA TA≤ 25 OC Df(mW/℃)TA≧25℃ ( C /W ) Power rating(mW) Power rating(mW) Power rating (mW) 70 6.06 1785 1142 928 O Note: 1.Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into Thermal shutdown. 2.TJ: Junction Temperature Calculation TJ = TA + ( PD x θJA ) The θJA numbers are guidelines for the thermal performance of the device/PC-board system. All of the above assume no Ambient airflow. 3.θJA : Thermal Resistance-Junction to Ambient, DF: Derating factor, Po: Power consumption VER 1.2 2                                                                                         ACE150X                                               Technology Pin Description No. 1 2 3 4 5 6 7 8 ACE1501 Pin Name N.C. VIN VOUT FB GND GND GND GND Function NC Supply Voltage Switch Pin. Connect inductor/diode h Feedback Pin. Ground Pin Ground Pin Ground Pin Ground Pin 150KHz,2A ,PWM Step-Down DC/DC Converter No. 1 2 3 4 5 6 7 8 ACE1502 Pin Name VIN VOUT FB SHDN GND GND GND GND Function Supply Voltage Switch Pin. Connect inductor/diode Feedback Pin. Shutdown Control Input. Active-Low into shutdown mode Ground Pin Ground Pin Ground Pin Ground Pin Block Diagram VER 1.2 3                                                                                         ACE150X                                               Technology Electrical Characteristics 150KHz,2A ,PWM Step-Down DC/DC Converter TA=25℃, VIN=12V for 3.3V,5V, and Adjustable version and VIN=18V for the 12V version, Io = 0.5A, unless Otherwise specified. Parameter Output Voltage Efficiency Output Voltage Efficiency Output Voltage Efficiency Feedback Voltage Efficiency Feedback bias Current Oscillator Frequency Oscillator Frequency OF Short Circuit Protect Saturation Voltage Max. Duty Cycle ( ON) Min. Duty Cycle ( OFF) Current Limit ACE1501/2-ADJ ACE1501/2-1.2 ACE1501/2-5.0 ACE1501/2-3.3 Symbol VOUT η VOUT η VOUT η VFB η IFB FOSC FSCP VSAT DC DC ILIMIT Conditions 5.5V