ACE150X Technology 150KHz,2A, PWM Step-Down DC/DC Converter Description 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 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 Thermal resistance junction to ambient SOP-8 θJA 70 Operating junction temperature Storage temperature range Operating temperature TJ TSTG TOPR 150 - 60 to 150 -40 to +125 O C/W O C C O C O Note : Exceeding these rating could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal. VER 1.2 1 ACE150X Technology 150KHz,2A ,PWM Step-Down DC/DC Converter Packaging Type SOP-8 (ACE1502XXFM+) Vin Vout FB SHDN GND GND GND GND 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 150KHz,2A ,PWM Step-Down DC/DC Converter Pin Description 1 2 ACE1501 Pin Name N.C. VIN 3 VOUT 4 5 6 7 8 No. Function No. 1 2 FB NC Supply Voltage Switch Pin. Connect inductor/diode h Feedback Pin. GND GND GND GND Ground Pin Ground Pin Ground Pin Ground Pin ACE1502 Pin Name VIN VOUT 3 FB 4 SHDN 5 6 7 8 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 150KHz,2A ,PWM Step-Down DC/DC Converter Electrical Characteristics 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 Symbol Conditions Min. Typ. Max. Unit VOUT 5.5V<VIN<22V, 0.2A<ILOAD<2A 3.168 3.3 3.432 V η VIN=12V,ILOAD=2A - 75 - % VOUT 8V< VIN<22V , 0.2A<ILOAD<2A 4.800 5.0 5.200 V η VIN=12V,ILOAD=2A - 80 - % VOUT 15V<VIN<22V , 0.2A<ILOAD<2A 11.52 12 12.48 V η VIN=16V,ILOAD=2A - 89 - % VFB 5V<VIN<22V, 0.2A<ILOAD<2A 1.193 1.230 1.267 V η VIN=12V,ILOAD=2A - 74 - % Feedback bias Current IFB VFB = 1.3V (Adjustable Only) - -10 -50 nA Oscillator Frequency FOSC TJ=25 ℃ 127 150 173 KHz When current limit occurred and VFB<0.5V, TA=25℃ 5 15 25 KHz Io = 2A, No outside circuit and VFB=0V force driver on - 1.4 1.6 V Output Voltage ACE1501/2-3.3 Efficiency Output Voltage ACE1501/2-5.0 Efficiency Output Voltage ACE1501/2-1.2 Efficiency Feedback Voltage ACE1501/2-ADJ Efficiency Oscillator Frequency OF Short Circuit Protect Saturation Voltage FSCP VSAT Max. Duty Cycle ( ON) DC VFB = 0V force driver on - 100 - % Min. Duty Cycle ( OFF) DC VFB = 12V force driver off - 0 - % Current Limit ILIMIT Peak current, No outside circuit and VFB= 0V force driver on 3.6 4.5 5.5 A Output Leakage Current No outside circuit VFB=12V force driver off, VOUT=0V - - -200 VIN=22V, VOUT=-1V -5 - 30 Output Leakage Current ILEAK µA Quiescent Current IQ VFB = 12V force driver off - 5 10 mA Standby Quiescent Current ISTBY ON/OFF Pin=5V,VIN=22V - 70 156 µA ON/OFF Pin Logic Input Threshold Voltage VIL Low(Regulator(ON) - VIH High(Regulator(OFF) 2.0 VIL VLOGIC=2.5V(OFF) VIH VLOGIC=0.5V(ON) ON/OFF Pin Logic Input Current 1.3 0.6 - V -0.01 -0.1 -1 VER 1.2 µA 4 ACE150X Technology 150KHz,2A ,PWM Step-Down DC/DC Converter Notes: Thermal Considerations: The SOP-8 package needs a heat sink under most conditions. The size of the heat sink depends on the input voltage, the load current and ambient temperature. The ACE150X junction temperature rises above ambient temperature for a 2A load and different input and output voltages. The data for these curves was taken with the ACE150X(SOP-8 package) operating as a buck-switching regulator in an ambient temperature of 25℃ (still air). These temperature increments are all approximate and are affected by many factors. Higher ambient temperatures require more heat sinker. For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper should be used in the board layout. ( One exception is the output(switch) pin, which should not have large areas of copper.) Large areas of copper provide the best transfer of heat (lower thermal resistance) to the surrounding air, and moving air lowers the thermal resistance even further. Package thermal resistance and junction temperature increments are affected by a lot of factors. Some of these factors include board size, shape, thickness, position, location, and even board temperature. Other factors are, trace width, total printed circuit copper area, copper thickness, single or double-sided, multi-layer board and the amount of solder on the board. The effectiveness of the PC board to dissipate heat also depends on the size, Furthermore, some of these components such as the catch diode will add heat to the PC board and the heat can vary as the input voltage changes. For the inductor, depending on the physical size, type or core material and the DC resistance, it could either act as a heat sink taking heat away from the board, or it could add heat to the board. Application Data 3A Diode 3A Diode VR(V) Surface Mount Through Hole Surface Mount Through Hole Scgittky Schottky Scgittky Schottky 1N5820 1N5823 20 SK32 SR302 SR502 MBR320 MBR520 1N5821 1N5824 30 SK33 MBR330 50WQ03 SR503 31DQ03 SB530 1N5822 1N5825 SK34 SR304 50WQ04 SR504 40 MBRS340 MBR340 SB540 31DQ04 SR305 SB550 SK35 MBR350 50WQ05 50SQ080 50 MBRS360 31DQ05 50WF10 HER601 MUR320 MUR620 VER 1.2 5 ACE150X Technology 150KHz,2A ,PWM Step-Down DC/DC Converter Quick design component selection table for adjustable output Output Voltage (V) 2 4 6 9 12 15 24 Through Hole Output Capacitor Panasonic Nichicon Feed HFQ Series PL Series forward (μF/V) (μF/V) Capacitor 820/35 820/35 33nF 560/35 470/35 10nF 470/25 470/25 3.3nF 330/35 330/25 1.5nF 330/25 330/25 1nF 220/35 220/25 680pF 220/35 150/35 560pF Surface Mount Output Capacitor Panasonic Nichicon Feed HFQ Series PL Series forward (μF/V) (μF/V) Capacitor 330/6.3 470/4 33nF 330/6.3 390/6.3 10nF 220/10 330/10 3.3nF 100/16 180/16 1.5nF 100/16 180/16 1nF 68/20 120/20 680pF 33/25 33/25 220pF Quick design component selection table for Fixed output Input / Output Condition Output Voltage (V) Load Current (A) 3 5 2 3 3.3 2 Max. input Voltage (V) 8 15 25 9 15 25 5 12 25 6 12 25 Output Capacitor (μF/V) Through Hole Surface Mount Electrolytic Tantalum Inductor Inductance (μF) Current (A) Nichicon PL Series Panasonic HFQ Series Sprague 595D Series AVX TPS Series 22 33 47 22 68 68 22 22 33 22 33 47 3.5 3.5 3.5 3.1 3.1 3.1 3.5 3.5 3.5 3.1 3.1 3.1 560/25 330/35 270/35 560/16 180/35 180/35 560/16 560/25 470/35 470/35 330/35 270/50 560/25 330/35 330/35 470/25 180/35 180/35 470/25 560/35 680/35 470/25 330/35 330/35 330/10 330/10 330/10 330/10 270/10 270/10 390/6.3 390/6.3 390/6.3 390/6.3 390/6.3 330/10 220/10 220/10 220/10 220/10 100/10 100/10 330/6.3 330/6.3 330/6.3 330/6.3 330/6.3 220/10 VER 1.2 6 ACE150X Technology Typical 150KHz,2A ,PWM Step-Down DC/DC Converter Applications 1. ACE1501 Reference : Fix Output Voltage Version: ACE1501 Adjustable Voltage Version : +5V to +24V C1 2 3 IN 3.3/2A SW L1 + + 470uF ACE1501 4 1 NC FB GND 5-8 R1 D1 C2 470uF R2 Power SOP-8 VOUT = VFB ( I + R1/R2 ) VFB = 1.23V . R2 = 1K - 3K 2. ACE1502 Reference : Fix Output Voltage Version : ACE1502 VER 1.2 7 ACE150X Technology 150KHz,2A ,PWM Step-Down DC/DC Converter Adjustable Voltage Version : 2.5V/2A Output Load ACE1502 VOUT = VFB ( I + R1 ) R2 VFB = 1.23V . R2 = 1K - 3K Delay Start Circuit : ACE1502 5 6 7 Application Note Maximum Power Dissipation Calculation: PD (max) =［ ( VIN (max) – VO (nom) ) ］x IO (nom) + VIN (max) x IQ Where: VO(nom) : The nominal output voltage IO(nom): The nominal output current and IQ: The quiescent current the regulator consumes at IO(MAX) VIN(max): The maximum input voltage VER 1.2 8 ACE150X Technology ACE150X Efficiency vs. Temperature (Vin=12V, Vout=5V,Io=2A) ACE150X Saturation Voltage vs. Temperature, (Vcc=12V, VFB=0V,VSD=0) 150KHz,2A ,PWM Step-Down DC/DC Converter ACE150X Efficiency vs. Temperature (Vin=12V, Vout=3.3V,Io=2A) ACE150X Switch Current Limit vs. Temperature (Vcc=12V, VFB=0V) Supply Current vs. Temperature (Vcc=12V, No Load, Von/off=0V (Switch ON), Von/off=5V (Switch OFF) VER 1.2 9 ACE150X Technology 150KHz,2A ,PWM Step-Down DC/DC Converter ACE150X Threshold voltage vs. Temperature, (Vcc=12V,Io=100mA) ACE150X ON/OFF Current vs. ON/OFF Voltage (Vin=12V) ACE150X Frequency vs. Temperature, (Vcc=12V,Io=100mA, Vout=5V) ACE150X Feedback Current vs. Temperature (Vcc=12V,Vout=5V,VFB=1.3V) ACE150X Output Voltage vs. Temperature, (Vcc=12V,Io=2A) VER 1.2 10 ACE150X Technology 150KHz,2A ,PWM Step-Down DC/DC Converter Frequency vs. Temperature, (Vin=5V, Vout=15V) Feedback Voltage vs. Temperature (Vin=5V,Vout=15V) Supply Current vs. Temperature (Vin=5V, Vout=15V ; Iout=0V) Supply Current vs. Supply Voltage (Vout=15V;Iout=0A) Efficiency vs. Output Current (Vin=5V, Vout=15V) Efficiency vs. Output Current (Vin=3.35V;Vout=15V) VER 1.2 11 ACE150X Technology 150KHz,2A ,PWM Step-Down DC/DC Converter Packing Information 8-Pin Plastic S.O.I.C. VER 1.2 12 ACE150X Technology 150KHz,2A ,PWM Step-Down DC/DC Converter Notes ACE does not assume any responsibility for use as critical components in life support devices or systems without the express written approval of the president and general counsel of ACE Electronics Co., LTD. As sued herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and shoes failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. ACE Technology Co., LTD. http://www.ace-ele.com/ VER 1.2 13