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| ACE1117 Technology Description 1A Positive Voltage Regulators ACE1117 series of high performance low dropout voltage regulators are designed for applications that require efficient conversion and fast transient response. In addition, ACE1117 is designed to be stable under conditions where Cin and Cout are not present. However, it is recommended to include Cin and Cout in the system design as this will speed up the transient response and increase the PSRR rating. Features Low Dropout Performance. Low Quiescent Current: 3mA (Typ.) Guaranteed 1A Output Current. Wide input Supply Voltage Range. Stable operation without Cin and Cout. Over-temperature and Over-current Protection Fixed or Adjustable Output Voltage. Rugged 2KV ESD withstand capability. Available in SOT-223 and TO-252 Packages. RoHS Compliant and 100% Lead (Pb)-Free Application Active SCSI Terminators High Efficiency Linear Regulators 5V to 3.3V Linear Regulators Motherboard Clock Supplies Absolute Maximum Ratings Parameter Input voltage Junction temperature Thermal Resistance Junction to Ambient Storage temperature Symbol VIN TJ JA TS Max Unit 9 V O -40 to 130 C O 60 C/W - 40 to 150 OC Packaging Type SOT-223 TO-252 Pin 1 2 1 2 3 Symbol ADJ/GND Vout Vin 1 2 3 3 VER 1.3 1 ACE1117 Technology Ordering information Selection Guide ACE1117 XX XX + H Halogen - free Pb - free XM : SOT-223 YM : TO-252 1A Positive Voltage Regulators Output Voltage : 1.5 / 1.8V / 2.5V / 3.3V..... 5.0V / Default: Adjustable Version Electrical Characteristics VIN.MAX8V, VIN.MAX-VOUT=1.5V, IOUT=10mA, CIN=10uF, COUT=22uF, TA=25, unless otherwise specified. Parameter Symbol Test Conditions ACE1117-15 ACE1117-18 ACE1117-25 ACE1117-33 ACE1117-50 (VIN-VOUT)=1.5V IOUT=10mA VOUT+1.5V 1.470 1.764 2.450 3.234 4.900 (-2%) Typ 1.5 1.8 2.5 3.3 5.0 1.250 0.3 0.5 3 65 Mum 1.530 1.836 2.550 3.366 5.100 (+2%) Unit Output Voltage (1) VO V Reference Voltage (1) (ADJ. Voltage Version) Line Regulation (1) Load Regulation (1) VREF VSR VLR IQ IADJ IADJ VD IO ICL TC OTP VN RA V % % mA uA uA V mA A %/ %VO dB Quiescent Current (2) Adjust Pin Current Adjust Pin Current Change Dropout Voltage (3) Minimum Load Current Current Limit Temperature Coefficient Thermal Protection RMS Output Noise Ripple Rejection Ratio VOUT+1.5V TA=25, 10Hzf100kHz f=120Hz, COUT=22uF (Tantalum), (VIN-VOUT)=3V, IOUT=10mA 0.003 55 VER 1.3 2 ACE1117 Technology Note1: Low duty cycle pulse testing with which TJ remains unchanged. 2: The IQ of ACE1117-1.5 is 1.2mA (Typ.) 1A Positive Voltage Regulators 3: The dropout voltage is the input/output differential at which the circuit ceases to regulate against further reduction in input Typical Application Adjustable Voltage Regulator Vin>=3.0V Vin ACE1117 Vout ADJ R1 124ohm Vout=1.5V Cin 10uF Cout 22uF R2 24.9ohm VOUT=VREF * (1+R2/R1)+IADJ * R2 ACE1117-3.3 Fixed Voltage Regulator Application Hints The typical Linear regulator would require external capacitors to ensure stability. However, ACE1117 is designed in such a way that these external capacitor can be omitted if the PCB layout is tight and system noise is not very high. For better transient and PSRR performance, the Input and Output capacitors are still recommended. Input Capacitor An input capacitor of 10F is recommended. Ceramic or Tantalum can be used. The value can be increased without upper limit. VER 1.3 3 ACE1117 Technology Output Capacitor 1A Positive Voltage Regulators An output capacitor of 22uF is recommended for better transient and PSRR performance. It should be placed no more than 1 cm away from the VOUT pin, and connected directly between VOUT and GND pins. The value may be increased without upper limit. Thermal Considerations It is important that the thermal limit of the package is not exceeded. The ACE1117 has built-in thermal protection. When the thermal limit is exceeded, the IC will enter protection, and VOUT will be pulled to ground. The power dissipation for a given application can be calculated as following: The power dissipation (PD) is PD = IOUT * [VIN - VOUT] The thermal limit of the package is then limited to PD(MAX) = [TJ - TA]/JA where TJ is the junction temperature, TA is the ambient temperature, and JA is around 180C/W for ACE1117. ACE1117 is designed to enter thermal protection at 175C. For example, if TA is 25C then the maximum PD is limited to about 0.83W. In other words, if IOUT(MAX) = 500mA, then [VIN - VOUT] can not exceed 1.66V. (Ref. SOT-223 without heat sink.) Typical Performance Characteristic Reference Voltage vs Junction Temperature Output Voltage vs Junction Temperature Junction Temperature () Junction Temperature () VER 1.3 4 ACE1117 Technology Dropout Voltage vs Output Current 1A Positive Voltage Regulators PSRR vs Frequency Output Current (mA) Frequency (Hz) Liine Transients Load Transients Short Transient Response VER 1.3 5 ACE1117 Technology Packing Information SOT-223 1A Positive Voltage Regulators VER 1.3 6 ACE1117 Technology Packing Information TO-252 1A Positive Voltage Regulators VER 1.3 7 ACE1117 Technology 1A Positive Voltage Regulators 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 1.3 8 |
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