CYT 8117 1A Positive Voltage Regulator Features General Description The CYT8117 series of high performance low dropout voltage regulators are designed gor applications that require efficient conversion and fast transient response. ■ ■ ■ ■ ■ ■ ■ ■ 1.1V dropout at full load current（Typ） Low Dropout Performance. Guaranteed 1A Output Current. Wide Input Supply Voltage Range. Over-temperature and Over-current Protection. Fixed or Adjustable Output Voltage. Rugged 3KV ESD withstand capability. Available in SOT-223 Packages. Applications ■ ■ ■ ■ SOT-223 Active SCSI Terminators. High Efficiency Linear Regulators. 5V to 3.3V Linear Regulators Motherboard Clock Supplies. Package ShenZhen CYT IC Design CO ,Ltd 1 CYT 8117 Pin Configuration 1. ADJ/GND 2. OUT 3. VIN SOT-223 Typical Application Adjustable Voltage Regulator Fixed Voltage Regulator ShenZhen CYT IC Design CO ,Ltd 2 CYT 8117 Ordering Information CYT8117T- X -LF X Lead-free Output Voltage:15 : Vout=1.5V 18 : Vout=1.8V 25 : Vout=2.5V 30 : Vout=3.0V 33 : Vout=3.3V A : Vout=ADJ Electrical Characteristic VIN,MAX ≤ 8V, VIN,MIN – VOUT = 1.5V, IOUT = 10mA, CIN = 10µF, COUT = 22µF, TJ = 0 – 125°C, unless otherwise specified. Symbol VOUT Parameter Conditions (1) Output Voltage Min Typ Max Units +2％ V (VIN-VOUT)=1.5V , IOUT= 10mA, TA=25℃ CYT8117T15 CYT8117T18 CYT8117T25 CYT8117T30 CYT8117T33 -2％ (VIN-VOUT)=1.5V , 10mA, -2％ 1.25 -2％ V 1.5 1.8 2.5 2.8 3.0 VREF Reference Voltage(1) (Adi. Volage Version) VSR Line Regulation(1) VOUT+1.5V <VIN< 8V IOUT= 10mA, -- 0.3 -- ％ VLR Load Regulation(1) (VIN-VOUT)=1.5V , 10mA≤IOUT≤1A, -- 0.4 -- ％ IADJ Adjust Pin Current -- 48 -- uA ∆IADJ Adjust Pin Current Change VOUT+1.5V <VIN< 8V 10mA≤IOUT≤1A, -- 0.2 -- uA VD Dropout Voltage(2) ∆VREF=1％, IOUT=1A -- 1.1 -- V IQ Quiescent Current Fixed Output Version -- 10 -- mA IO Minimum Load Current -- 4 -- mA ICL Current Limit -- 1.8 -- A TC Temperature Voefficient -- 0.07 -- ％/℃ OTP Thermal Protection -- 175 -- ℃ VN RMS Output Noise TA=25℃, 10Hz ≤ f ≤ 10KHz -- 0.003 -- ％Vo RA Ripple Rejection Ratio F=120Hz, Cout=22uF (Tantalum),(VIN-VOUT)=3V, IOUT=1A -- 35 -- dB IOUT= Notes:1. Low duty cycle pulse testing with which TJ remains unchanged. 2. ∆VOUT, ∆VREF = 1%. ShenZhen CYT IC Design CO ,Ltd 3 CYT 8117 Absolute Maximum Rating Parameter Symbol Value Units Input Supply Voltage VIN 9 V Thermal Resistance, Junction-to-Ambient SOT-223 ӨJA 60 ℃/W Lead Temperature (Soldering,10 sec.) TLEAD 260 ℃ Operating Junction Temperature Range TJ 0 to +125 ℃ Storage Temperature Range TSTG -40 to +150 ℃ Application Hints Like any linear voltage regulator, CYT8117 requires external capacitors to ensure stability. The external capacitors must be carefully selected to ensure performance. Input Capacitor An input capacitor of at least 10µF is required. Ceramic or Tantalum can be used. The value can be increase without upper limit. Output Capacitor An output capacitor is required for stability. It must be placed no more than 1 cm away from the VOUT pin, and connected directly between VOUT and GND pins. The minimum value is 22µF but may be increase without limit. Thermal Considerations It is important that the thermal limit of the package is not exceeded. The CYT8117 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]/ΘJA where TJ is the junction temperature, TA is the ambient temperature, and ΘJA is around 60°C/W for CYT8117.CYT8117 is designed to enter thermal protection at 175°C. For example, if TA is 25°C then the maximum PD is limited to about 2.5W. In other words, if IOUT(MAX) = 1A, then [VIN – VOUT] cannot exceed 2.5V. ShenZhen CYT IC Design CO ,Ltd 4 CYT 8117 Typical Performance Characteristics ShenZhen CYT IC Design CO ,Ltd 5 CYT 8117 Outline Drawing for SOT-223 DIM A B C D d E e L L1 L2 K N DIMENSIONS INCHES MM MIN MAX MIN MAX -- 0.071 -- 1.80 0.025 0.033 0.640 0.840 0.012 -- 0.31 -- 0.248 0.264 6.30 6.71 0.115 0.124 2.95 3.15 -- 0.090 -- 2.29 0.033 0.041 0.840 1.04 0.264 0.287 6.71 7.29 0.130 0.148 3.30 3.71 0.012 -- 0.310 -- 0.010 0.014 0.250 0.360 ShenZhen CYT IC Design CO ,Ltd 6