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ACE2596
Technology Description
150KHz 3A Buck DC-DC Converter
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 80A 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 Input voltage ON/OFF Pin Voltage Feedback Pin Voltage Operating Junction Temperature Thermal Resistance (Junction to Ambient, No Heatsink) TO-263-5 Lead Temperature (Soldering, 10sec) Storage Temperature Range Symbol VIN VON/OFF VFB TJ RJA TLEAD TSTG Max 40 40 40 150 60 260 -65 to150
O
Unit V V V
O
C
C/W
O
C C
O
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

ACE2596
Technology Packaging Type
TO-263-5 (WM)
5.ON/OFF 4.FB 3.GND 2.Vout 1.Vin
150KHz 3A Buck DC-DC Converter
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

ACE2596
Technology Recommended Operating Conditions
Parameter 3.3V 5.0V Maximum Input Voltage (Note 2) 12V ADJ (VOUT=3.2V) ADJ (VOUT=2.5V) Operating Junction Temperature
150KHz 3A Buck DC-DC Converter
Symbol Value Unit 32 32 V 32 32 25 -40 to 125 OC
VIN
TJ
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 Output Efficiency
Symbol VOUT
Conditions 5.5VVIN32V, 0.2AILOAD3A VIN=12V, ILOAD=3A
Min 3.168 3.135
Typ 3.3 75
Max 3.432 3.465
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 Output Efficiency
Symbol VOUT
Conditions 7VVIN32V, 0.2AILOAD3A VIN=12V, ILOAD=3A
Min 4.800 4.750
Typ 5 80
Max 5.200 5.250
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 Output Efficiency
Symbol VOUT
Conditions 15VVIN32V, 0.2AILOAD3A VIN=24V, ILOAD=3A
Min 11.52 11.40
Typ 12.0 88
Max 12.48 12.60
Unit V %
VER 1.2
3

ACE2596
Technology
For ADJ Output Voltage Version
150KHz 3A Buck DC-DC Converter
Unless otherwise specified, TJ=25, The specifications with boldface type apply over Full Operating Junction Temperature Range.
Parameter Output Efficiency
Symbol VOUT
Conditions 4.5VVIN32V, 0.2AILOAD3A VOUT programmed for 2.5V VIN=12V, ILOAD=3A, VOUT=2.5V
Min 1.193 1.180
Typ 1.23 73
Max 1.267 1.280
Unit V %
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 Feedback Bias Current Oscillator Frequency Saturation Voltage Maximum Duty Cycle Minimum Duty Cycle Current Limit
Symbol IFB f VSAT DMAX DMIN ICL
Conditions Adjustable Version Only, VFB=1.3V (Note 3) ILOAD=3A (No output devices, VFB=0V) VFB=0V VFB=1.3V Peak Current, No output devices, VFB=0V Output=0V, No output devices, VFB =1.3V, VIN=32V Output=-1V, No output devices, VFB =1.3V, VIN=32V VFB=1.3V ON/OFF Pin=5V, VIN=18V Regulator ON Regulator OFF VPIN5=2.5V (Regulator OFF) VPIN5=2.5V (Regulator ON)
Min
Typ 10
Max 50 100 173 173 1.5 1.6
Unit nA kHz V % %
127 110
150 1.2 100 0
3.6 3.4
4.5
6.9 7.5
A A
50 2 5 80 30 10 200 250 0.6 2.0 5 0.02 15 5
Output Leakage Current
ISWL
mA mA A V V A A
Quiescent Current Standby Quiescent Current
IQ ISTBY VIL VIH IH
ON/OFF Pin Logic Input Threshold Voltage
ON/OFF Pin Input Current
Note :
IL
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

ACE2596
Technology Typical Performance Characteristics
150KHz 3A Buck DC-DC Converter
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

ACE2596
Technology
150KHz 3A Buck DC-DC Converter
Figure 7. Load Regulation
Figure 8. Switch Saturation Voltage vs. Switch Current
Figure 9. Switch Current Limit vs. Junction Temperature
Figure 10. Quiescent Current vs. Supply Voltage
Figure 11. Quiescent Current Limit vs. Junction Temperature
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

ACE2596
Technology Typical Application
150KHz 3A Buck DC-DC Converter
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

ACE2596
Technology
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 FEEDBACK 1 ACE2596-ADJ 2 Vin Output + GND ON/OFF 3 5 CFF 33nF L1 22uH D1 1N5822 2.5V Regulated DC Output 3A Load Vout=1.23*((R2+R1)/R1) + Cout 220uF
Cin 470uF
L1: Sumida CDRH127/LDNP-220MC or Equivalent Figure 19. Typical Application of ACE2596-ADJ
VER 1.2
9

ACE2596
Technology
150KHz 3A Buck DC-DC Converter
Packing Information
TO-263-5
VER 1.2
10

ACE2596
Technology
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

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