1A Positive Voltage Regulators (Preliminary) Description CYT8117 Features The CYT8117 series of high performance low dropout voltage regulators are designed for applications that require efficient conversion and fast transient response. ¾ Low Dropout Performance. ¾ Guaranteed 1A Output Current. ¾ Wide Input Supply Voltage Range. ¾ Over-temperature and Over-current Protection. Pin Configuration Tab is Vout 1 2 ¾ Fixed or Adjustable Output Voltage. ¾ Rugged 3KV ESD withstand capability. ¾ Available in SOT-223 Packages. 3 Application ¾ Active SCSI Terminators. Front View ¾ High Efficiency Linear Regulators. SOT-223 ¾ 5V to 3.3V Linear Regulators ¾ Motherboard Clock Supplies. Adj/Gnd Out In Ordering Information Device CYT8117TXX VOUT Volts Package Fixed output voltages; XX denotes voltage options (1.5V, 1.8V, 2.5V, 3.0V, and 3.3V). SOT-223 CYT8117TA CYT8117TXXLF CYT8117TALF Adjustable output voltage. SOT-223 Fixed output voltages; XX denotes voltage options (1.5V, 1.8V, 2.5V, 3.0V, and 3.3V). (Lead-free) Adjustable output voltage. Absolute Maximum Rating Symbol VIN θJA TJ Parameter Input Supply Voltage Thermal Resistance Junction to Ambient SOT-223 Operating Junction Temperature Range TSTG Storage Temperature Range TLEAD Lead Temperature (Soldering 10 Sec) Maximum Units 9 V 60 0 to 125 °C/W °C -40 to 150 °C 260 °C Preliminary and all contents are subject to change without prior notice. 1 1A Positive Voltage Regulators (Preliminary) CYT8117 Electrical Characteristic VIN,MAX ≤ 8V, VIN,MIN – VOUT = 1.5V, IOUT = 10mA, CIN = 10µF, COUT = 22µF, TJ = 0 – 125°C, unless otherwise specified. Symbol Parameter Test Condition Min Typ Max Units (+2%) V 1.250 (+2%) V (VIN - VOUT) = 1.5V, IOUT = 10mA, TA = 25°C, CYT8117T15 VO Output Voltage (1) CYT8117T18 1.5 (-2%) 1.8 CYT8117T25 2.5 CYT8117T30 3.0 CYT8117T33 3.3 VREF Reference Voltage (1) (Adj. Voltage Version) (VIN - VOUT) = 1.5V IOUT = 10mA (-2%) 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 -- % IQ Quiescent Current Fixed Output Version -- 10 -- mA IADJ Adjust Pin Current -- 48 -- µA ∆IADJ Adjust Pin Current Change VOUT + 1.5V < VIN < 8V 10mA ≤ IOUT ≤ 1A -- 0.2 -- µA VD Dropout Voltage (2) ∆VREF = 1%, IOUT = 1A -- 1.1 -- V IO Minimum Load Current -- 4 -- mA ICL Current Limit -- 1.8 -- A TC Temperature Coefficient -- 0.07 -- %/°C OTP Thermal Protection -- 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 = 1A -- 35 -- dB Notes: 1. Low duty cycle pulse testing with which TJ remains unchanged. 2. ∆VOUT, ∆VREF = 1%. Preliminary and all contents are subject to change without prior notice. 2 1A Positive Voltage Regulators (Preliminary) CYT8117 Typical Application Adjustable Voltage Regulator VIN >= 3.0V 3 2 CYT8117TA VOUT = 1.5V VREF R1 124 Ohm 1 CIN 10uF COUT 22uF IADJ R2 24.9 Ohm Fixed Voltage Regulator VIN >= 4.8V CIN 10uF 3 CYT8117T33 2 VOUT = 3.3V COUT 22uF 1 IQ Preliminary and all contents are subject to change without prior notice. 3 1A Positive Voltage Regulators (Preliminary) CYT8117 Application Hints Thermal Considerations Like any linear voltage regulator, CYT8117 requires It is important that the thermal limit of the package external capacitors to ensure stability. The is not exceeded. The CYT8117 has built-in external capacitors must be carefully selected to thermal protection. When the thermal limit is ensure performance. exceeded, the IC will enter protection, and VOUT will be pulled to ground. The power dissipation 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. following: The power dissipation (PD) is PD = IOUT * [VIN – VOUT] Output Capacitor An output capacitor is required for stability. for a given application can be calculated as It must be placed no more than 1 cm away from the The thermal limit of the package is then limited to VOUT pin, and connected directly between VOUT PD(MAX) = [TJ – TA]/ΘJA where TJ is the junction and GND pins. The minimum value is 22µF but temperature, TA is the ambient temperature, and may be increase without limit. 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. Preliminary and all contents are subject to change without prior notice. 4 1A Positive Voltage Regulators (Preliminary) Typical Performance Characteristics Line Transients Reference Voltage vs Junction Temperature Reference Voltage (mV) 1250 VIN = 4.5V – 5.5 V 1245 1240 1235 CIN = 0.1µF, COUT = 1µF 1230 1225 1220 -25 0 25 50 75 100 125 150 Junction Temperature (C) Load Transients Output Voltage vs Junction Temperature 3.70 3.65 Output Voltage 3.60 ILOAD = 10mA – 1A 3.55 3.50 3.45 3.40 3.35 COUT = 22µF, CIN = 10µF 3.30 3.25 3.20 -25 0 25 50 75 100 125 150 Junction Temperature (C) Dropout Voltage vs Output Current 1.14 Dropout Voltage (V) 1.12 1.1 1.08 1.06 1.04 1.02 1 0 200 400 600 800 1000 Output Current (mA) Preliminary and all contents are subject to change without prior notice. 5 CYT8117 1A Positive Voltage Regulators (Preliminary) Outline Drawing for SOT-223 Preliminary and all contents are subject to change without prior notice. 6 CYT8117