Technology ACE2596 150KHz 3A Buck DC-DC Converter Description The ACE2596 series of regulators are fixed frequency PWM buck (step-down) DC/DC converter, capable of driving a 3A load with excellent line and load regulation. These regulators include internal frequency compensation and a fixed frequency oscillator so that they are easy to use. A system adopting ACE2596 requires a minimum number of external components to work. A standard series of inductors, optimized for use with the ACE2596 series, are available from several manufacturers. This feature greatly simplifies the design of switch-mode power supplies. These ICs are available in TO-263-5 packages. Features • • • • • • • • • • 3.3V, 5V, 12V Fixed(±4% Tolerance) and Adjustable (±3% Tolerance) Output Versions Guaranteed 3A Output Load Current 150kHz Fixed Frequency Internal Oscillator Input Voltage Range up to 32V Requires only 4 external components High Efficiency up to 90% Excellent Line and Load Regulation TTL Shutdown Capability Low Power Standby Mode, IQ Typically 80μA Built-in Current Limit Protection and Thermal Shutdown Circuit Application • • • • LCD Monitor and LCD TV On-Card DC-DC Converter DVD Recorder PDP Absolute Maximum Ratings Parameter Symbol Max Unit Input voltage VIN 40 V ON/OFF Pin Voltage VON/OFF 40 V Feedback Pin Voltage VFB 40 V Operating Junction Temperature TJ 150 Thermal Resistance (Junction to Ambient, No Heatsink) TO-263-5 RθJA 60 Lead Temperature (Soldering, 10sec) TLEAD 260 O C Storage Temperature Range TSTG -65 to150 O C O O C C/W Note : Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device ate these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability. VER 1.2 1 Technology ACE2596 150KHz 3A Buck DC-DC Converter Packaging Type TO-263-5 (WM) 5.ON/OFF 4.FB 3.GND 2.Vout 1.Vin Ordering information Selection Guide ACE2596 XX XXX + H Halogen - free Pb - free WM :TO-263-5 Output Voltage： 3.3V/5.0V/12V/ADJ Functional Block Diagram VER 1.2 2 Technology ACE2596 150KHz 3A Buck DC-DC Converter Recommended Operating Conditions Parameter Symbol 3.3V 5.0V Maximum Input Voltage (Note 2) 12V ADJ (VOUT=3.2V) ADJ (VOUT=2.5V) Operating Junction Temperature VIN TJ Value Unit 32 32 V 32 32 25 -40 to 125 OC Note : For ADJ version, the recommended supply voltage depends on the needed output voltage. Electrical Characteristics For 3.3V Output Voltage Version Unless otherwise specified, TJ=25℃, The specifications with boldface type apply over Full Operating Junction Temperature Range. Parameter Symbol Output VOUT Efficiency η Conditions 5.5V≦VIN≦32V, 0.2A≦ILOAD≦3A VIN=12V, ILOAD=3A Min 3.168 3.135 Typ 3.3 Max 3.432 3.465 75 Unit V % For 5V Output Voltage Version Unless otherwise specified, TJ=25℃, The specifications with boldface type apply over Full Operating Junction Temperature Range. Parameter Symbol Output VOUT Efficiency η Conditions 7V≦VIN≦32V, 0.2A≦ILOAD≦3A VIN=12V, ILOAD=3A Min 4.800 4.750 Typ 5 Max 5.200 5.250 80 Unit V % For 12V Output Voltage Version Unless otherwise specified, TJ=25℃, The specifications with boldface type apply over Full Operating Junction Temperature Range. Parameter Symbol Output VOUT Efficiency η Conditions 15V≦VIN≦32V, 0.2A≦ILOAD≦3A VIN=24V, ILOAD=3A Min 11.52 11.40 Typ 12.0 88 Max 12.48 12.60 Unit V % VER 1.2 3 Technology ACE2596 150KHz 3A Buck DC-DC Converter For ADJ Output Voltage Version Unless otherwise specified, TJ=25℃, The specifications with boldface type apply over Full Operating Junction Temperature Range. Parameter Symbol Output VOUT Efficiency η Conditions 4.5V≦VIN≦32V, 0.2A≦ILOAD≦3A VOUT programmed for 2.5V VIN=12V, ILOAD=3A, VOUT=2.5V Min Typ Max Unit 1.193 1.180 1.23 1.267 1.280 V 73 % Electrical Characteristics For AallOutput Voltage Versions Unless otherwise specified, VIN=12V for 3.3V, 5V and adjustable version, VIN=24V for 12V version, ILOAD=500mA, TJ=25℃. Specifications with boldface type apply over Full Operating Junction Temperature Range. Parameter Symbol Conditions Feedback Bias Current IFB Adjustable Version Only, VFB=1.3V Oscillator Frequency f (Note 3) Saturation Voltage VSAT ILOAD=3A (No output devices, VFB=0V) Maximum Duty Cycle DMAX VFB=0V 100 % Minimum Duty Cycle DMIN VFB=1.3V 0 % Current Limit ICL Peak Current, No output devices, VFB=0V Output Leakage Current ISWL Quiescent Current IQ Standby Quiescent Current ISTBY ON/OFF Pin Logic Input Threshold Voltage ON/OFF Pin Input Current Min 127 110 3.6 3.4 Typ Max Unit 10 50 100 nA 150 173 173 kHz 1.2 1.5 1.6 V 4.5 6.9 7.5 A Output=0V, No output devices, VFB =1.3V, VIN=32V 50 Output=-1V, No output devices, VFB =1.3V, VIN=32V 2 30 mA VFB=1.3V 5 10 mA 80 200 250 μA 0.6 V ON/OFF Pin=5V, VIN=18V μA VIL Regulator ON VIH Regulator OFF IH VPIN5=2.5V (Regulator OFF) 5 15 μA IL VPIN5=2.5V (Regulator ON) 0.02 5 μA 2.0 V Note : 1. The switching frequency is reduced when the second stage current limit is activated. 2. The specifications with boldface are GBD (Guaranteed By Design). VER 1.2 4 Technology ACE2596 150KHz 3A Buck DC-DC Converter Typical Performance Characteristics Figure 1. Efficiency vs. Output Current Figure 2. Efficiency vs. Output Current Figure 3. Efficiency vs. Output Current Figure 4. Efficiency vs. Output Current Figure 5. Efficiency vs. Input Current Figure 6. Line Regulation VER 1.2 5 Technology Figure 7. Load Regulation Figure 9. Switch Current Limit vs. Junction Temperature Figure 11. Quiescent Current Limit vs. Junction Temperature ACE2596 150KHz 3A Buck DC-DC Converter Figure 8. Switch Saturation Voltage vs. Switch Current Figure 10. Quiescent Current vs. Supply Voltage Figure 12. Shutdown Quiescent Current vs. Input Voltage VER 1.2 6 ACE2596 Technology 150KHz 3A Buck DC-DC Converter Figure 13. On/Off Threshold Voltage vs. Junction Temperature Figure 14. On/Off Pin Current vs. On/Off Pin Voltage Figure 15. Switching Frequency vs. Junction Temperature VER 1.2 7 Technology ACE2596 150KHz 3A Buck DC-DC Converter Typical Application ACE2596-3.3V L1: Sumida CDRH127/LDNP-220MC or Equivalent Figure 16. Typical Application of ACE2596-3.3V ACE2596-5.0V L1: Sumida CDRH127/LDNP-220MC or Equivalent Figure 17. Typical Application of ACE2596-5.0V VER 1.2 8 Technology ACE2596 150KHz 3A Buck DC-DC Converter ACE2596-ADJ L1: Sumida CDRH127/LDNP-220MC or Equivalent Figure 18. Typical Application of ACE2596-12V R2 3.69K R1 3.6K 4 12V Unregulated DC Input Cin 470uF FEEDBACK 1 ACE2596-ADJ 2 Vin Output + GND ON/OFF 3 5 CFF 33nF 2.5V Regulated DC Output 3A Load L1 22uH D1 1N5822 Vout=1.23*((R2+R1)/R1) + Cout 220uF L1: Sumida CDRH127/LDNP-220MC or Equivalent Figure 19. Typical Application of ACE2596-ADJ VER 1.2 9 Technology ACE2596 150KHz 3A Buck DC-DC Converter Packing Information TO-263-5 VER 1.2 10 Technology ACE2596 150KHz 3A Buck 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 11