ACE1085G 3A Low Dropout Linear Regulator Description The ACE1085G is a low dropout positive adjustable or fixed-mode regulator with minimum of 3A output current capability. The product is specifically designed to provide well-regulated supply for low voltage IC applications such as high-speed bus termination and low current 3.3V logic supply. ACE1085G is also well suited for other applications such as VGA cards. ACE1085G is guaranteed to have <1.4V dropout at full load current making it ideal to provide well-regulated outputs of 1.25 to 5.0V with 4.7 to 12V input supply by different output voltage. Features ● 3-Terminal Adjustable ofr fixed 1.5V,1.8V,2.5V,3.3V,5.0V ● 1.4V Maximum Dropout at Full Load current ● Fast Transient response ● Built-in Thermal Shutdown ● Output current limiting Absolute Maximum Ratings Parameter Symbol Ratings DC Supply Voltage VIN Power Dissipation PD Storage Temperature TST Operating Junction Temperature Range TOP -0.3 to 12 Unit V Internally Limited -65 ~ 150 O C 0 ~ 150 O C Packaging Type TO-252 1 2 Adjustable Version TO-252 Description Function 1 ADJ Adjustable 2 Vout Output 3 Vin Input 3 Ordering information ACE1085G XX XX + H Halogen - free Pb - free YM : TO-252 Output Voltage : 1.5V / 1.8V / 2.5V ….. 5.0V / Default: Adjustable Version VER 1.5 1 ACE1085G 3A Low Dropout Linear Regulator Block Diagram Electrical Characteristics Parameter Reference Voltage ACE1085G ACE1085G-15 ACE1085G-18 Output Voltage ACE1085G-25 ACE1085G-33 ACE1085G-50 Line Regulator ACE1085GXXX ACE1085G ACE1085G-15 ACE1085G-18 Load Regulation ACE1085G-25 ACE1085G-33 ACE1085G-50 Dropout Voltage (Vin-Vout) Current Limit Conditions Io=10mA, TJ =25, (Vin-Vout )=1.5V Io=10mA, TJ =25, 3V≦Vin≦12V Io=10mA, TJ =25, 3.3V≦Vin≦12V Io=10mA, TJ =25, 4V≦Vin≦12V Io=10mA, TJ =25, 4.8V≦Vin≦12V Io=10mA, TJ =25, 6.5V≦Vin≦12V Min Io=3A(Vout=1% Vout) ACE1085GXXX Vin-Vout=5V Max Unit 1.225 1.250 1.275 V 1.470 1.500 1.530 V 1.764 1.800 1.836 V 2.450 2.500 2.550 V 3.235 3.300 3.365 V 4.900 5.000 5.100 V Io=10mA, Vout+1.5<Vin<12 Vin=3.3V, 0mA<Io<3A, TJ=25(Note 1,2) Vin=3.0V, 0mA<Io<3A, TJ=25(Note 1,2) Vin=3.3V, 0mA<Io<3A, TJ =25(Note 1,2) Vin=4.0V, 0mA<Io<3A, TJ=25(Note 1,2) Vin=5.0V, 0mA<Io<3A, TJ=25(Note 1,2) Vin=8.0V, 0mA<Io<3A, TJ=25(Note 1,2) ACE1085GXXX Typ 0.2 % 1 % 12 15 mV 15 18 mV 20 25 mV 26 33 mV 40 50 mV 1.3 1.4 V 3.1 A VER 1.5 2 ACE1085G 3A Low Dropout Linear Regulator Minimum Load Current Adjust Pin Current Quiescent Current Adjustable model Vin=5V 5 10 mA Adjustable model Vin=12V, Io=10mA 55 100 μA Fixed model Vin=12V, Io=0mA 12 mA 0.008 0.04 %W 60 70 dB Thermal Regulation Ripple Rejection TA=25℃, 30ms pulse F=120Hz,COUT=25μF, Tantalum, IO=3A ACE1085GXXX Temperature Stability Thermal Resistance Junction–to-Ambient (No heat sink ;No air flow) Thermal Resistance Junction-to-Case Vin=Vout+3V IO=10mA Control Circuitry / Power Transistor 0.5 % 98 ℃ /W 15 ℃ /W Note 1: See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are measured at a constant junction Temperature by low duty cycle pulse testing. Load regulation is measured at the output lead =1/18” from the package. Note 2: Line and load regulation are guaranteed up to the maximum power dissipation of 15W. Power dissipation is determined by the difference in input and output and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range. Functional Description Introduction The ACE1085G adjustable or fixed-mode Low Dropout (LDO) regulator is a 3 terminal device which can easily be programmed by internal mask change to any voltage within the range of 1.25 to Vin-1.4V. The ACE1085G only needs 1.4V differential between Vin and Vout to maintain output regulation, in addition, the output voltage tolerances are also extremely tight and they include the transient response as port of the specification. For example, Intel VRE specification calls for a total of ±100mV including initial tolerance, load regulation and 0 to 3A load step. The ACE1085G is specifically designed to meet the fast current transient needs as well as providing an accurate initial voltage, reducing the overall system cost with the need for fewer output capacitors. Load Regulation Since the ACE1085G is only a 3 terminal device, it is not possible to provide true remote sensing of the output voltage at the load. But it can supply good load regulation by internal feedback bypass the external loss such as adjustable mode. Stability The ACE1085G requires the use of an output capacitor as part of the frequency compensation in order to make the regulator stable .For most applications a minimum of 10uF aluminum electrolytic capacitor insures both stability and good transient response. VER 1.5 3 ACE1085G 3A Low Dropout Linear Regulator Thermal Design The ACE1085G incorporates an internal shutdown that protects the device when the junction temperature exceeds the maximum allowable junction temperatures. Although this device can operate with junction temperatures in the range of 150℃, it is recommended that the selected heat sink be chosen such that during maximum continuous load operation the junction temperature is kept below the temperature. Layout Consideration The output capacitors must be located as close to the Vout terminal of the device as possible .It is recommended to use a section of a layer of the PC board as a plane to connect the Vout pin to the output capacitors to prevent any high frequency oscillation that may result due to excessive trace inductance. Typical Circuit 5V to 3.3V Fixed Mode Regulator Adjustable Regulator Note: VO = VREF * (1+R2/R1) VER 1.5 4 ACE1085G 3A Low Dropout Linear Regulator Typical Performance Characteristic Dropout Voltage VS. Output Current Output Current (A) Percent Change in Output Voltage vs Temperature Temperature (℃) Load Transient Response Time (μs) Load Regulation vs Temperature Temperature (℃) Line Regulation Input Voltage (V) Load Transient Response Time (μs) VER 1.5 5 ACE1085G 3A Low Dropout Linear Regulator Packing Information TO-252 VER 1.5 6 ACE1085G 3A Low Dropout Linear Regulator 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 1.5 7