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Technical content

Features

 Low Dropout Performance.  Low Quiescent Current：2.7mA（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.  Available in SOT-223 and TO252 Packages.  RoHS Compliant

Description

The SE8117 series of high performance low dropout voltage regulators are designed for applications that require efficient conversion and fast transient response. In addition, SE8117 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. SE8117 is characterized unde r Junction Temperature from -40°C to +125°C. Pin Configuration

Ordering Information

SE8117TXXHF SE8117TXXHF SOT-223(Halogen Free) XX denotes voltage options (ADJ,1.5V,1.8V, 2.5V,3.3V and 5.0V) SE8117TXXLF SE8117TXXLF TO-252(Lead Free) Absolute Maximum Rating Symbol Parameter Maximum Units VIN Input Supply Voltage 18 V θJA Thermal Resistance Junction to Ambient (SOT-223) 120 °C/W TJ Operating Junction Temperature Range -40 to 125 °C TSTG Storage Temperature Range -40 to 150 °C TLEAD Lead Temperature (Soldering 10 Sec) 260 °C TMJ Maximum Junction Temperature 150 °C Application  Active SCSI Terminators.  High Efficiency Linear Regulators.  5V to 3.3V Linear Regulators  Motherboard Clock Supplies.

Preliminary and all contents are subject to change without prior notice. Electrical Characteristic VIN,MAX ≤ 9V, VIN,MIN – VOUT = 2V, IOUT = 10mA, CIN = 10µF, COUT = 22µF, TA = 25°C, unless otherwise specified. Symbol Parameter Test Condition Min Typ Max Units VO Output Voltage SE8117T-15 SE8117T-18 SE8117T-25 SE8117T-33 SE8117T-50 1.470 1.764 2.450 3.234 4.900 1.5 1.8 2.5 3.3 5.0 1.530 1.836 2.550 3.366 5.100 V VREF Reference Voltage (Adj. Voltage Version) (VIN - VOUT) = 1.5V VSR Line Regulation VOUT + 1.5V < VIN < 9V IOUT = 10mA -- 0.3 -- %/V VLR Load Regulation (1) (VIN - VOUT) = 2.0V 10mA ≤ IOUT ≤ 1A -- 0.0001 -- %/mA IQ Quiescent Current Fixed Output Version -- 2.7 5 mA IADJ (IGND) Adjust Pin Current （GND Current） -- 50 120 μA ∆IADJ Adjust Pin Current Change VOUT + 1.5V < VIN < 9V -- 0.2 5 μA VD Dropout Voltage (1) (2) IOUT = 1A -- 1.38 1.49 V IO Minimum Load Current -- 0.4 5 mA ICL Current Limit (1) 1 1.35 -- A TC Temperature Coefficient -- 30 -- ppm/℃ OTP Thermal Protection VIN=9V, IOUT=10mA -- 175 -- °C VN RMS Output Noise TA = 25°C, 10Hz ≤ f ≤ 10kHz -- 0.003 -- %VO RA Ripple Rejection Ratio f = 120Hz, COUT = 22μF (Tantalum), (VIN - VOUT) = 3V, IOUT = 10mA -- 60 -- dB Notes: 1. Low duty cycle pulse testing with which TJ remains unchanged. 2. The dropout voltage is the input/output differential at which the circuit ceases to regulate against further reduction in input voltage. It is measured when the output voltage has dropped 98% from the nominal value obtained at VIN = VOUT +2V.

Preliminary and all contents are subject to change without prior notice. Typical Application

Preliminary and all contents are subject to change without prior notice. Application Hints The typical Linear regulator would require external capacitors to ensure stability. However, SE8117 is designed i n 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 10μF is recommended. Ceramic or Tantalum can be used. The value can be increased without upper limit. Output Capacitor 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 V OUT 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 SE8117 has bui lt-in thermal protection. When the thermal limit is exceeded, the IC will enter protection, and V OUT 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 P D(MAX) = [T J – TA]/ΘJA where T J is the junction temperature, TA is the ambient temperature, and Θ JA is around 120 °C/W for SE8117. SE8117 is designed to enter thermal protection at 1 25°C. For example, if T A is 25°C then the maximum P D is limited to about 0.83W. In other words, if IOUT(MAX) = 500mA, then [V IN – VOUT] can not exceed 1.66V. (Ref. SOT223 without heat sink.)

Preliminary and all contents are subject to change without prior notice. Typical Performance Characteristics Reference Voltage vs Junction Temperature 1.244 1.245 1.246 1.247 1.248 1.249 1.250 1.251 25 40 55 70 85 100 115 130 145 Junction Temperature (C) Reference Voltage (V) Output Voltage vs Load Current 1.786 1.7862 1.7864 1.7866 1.7868 1.787 1.7872 1 10 100 1000 Load Current (mA) Output Voltage (V) Dropout Voltage vs Load Current 0.9 1.1 1.2 1.3 1.4 1.5 1 10 100 1000 Load Current (mA) Dropout Voltage (V) PSRR vs Frequency 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 100 1000 10000 100000 Frequency(Hz) PSRR(dB) Dropout V olatge VS Oueput Current Adjus Pin Current VS Temperature

Preliminary and all contents are subject to change without prior notice. Typical Performance Characteristics Short Transient Response Short Circuit Start-up Transient Line Transient Response Load Transient Response

Preliminary and all contents are subject to change without prior notice. Outline Drawing for SOT-223 Outline Drawing for TO252

Preliminary and all contents are subject to change without prior notice. Customer Support Seaward Electronics Incorporated – China Section B, 2nd Floor, ShangDi Scientific Office Complex, #22 XinXi Road Haidian District, Beijing 100085, China Tel: 86-10-8289-5700/01/05 Fax: 86-10-8289-5706 Seaward Electronics Corporation – Taiwan 2F, #181, Sec. 3, Minquan East Rd, Taipei, Taiwan R.O.C Tel: 886-2-2712-0307 Fax: 886-2-2712-0191 Seaward Electronics Incorporated – North America 1512 Centre Pointe Dr. Milpitas, CA95035, USA Tel: 1-408-821-6600 Last Updated - 11/11/2013