CYT8117TXXLF

1A Positive Voltage Regulators (Preliminary) Description The CYT8117 series of high performance low dropout voltage regulators are designed for applications that require efficient conversion and fast transient response. CYT8117 Features Low Dropout Performance. Guaranteed 1A Output Current. Wide Input Supply Voltage Range. Over-temperature and Over-current Protection. Fixed or Adjustable Output Voltage. Tab is Vout Pin Configuration Rugged 3KV ESD withstand capability. Available in SOT-223 Packages. 1 2 3 Application In Adj/Gnd Out Front View Active SCSI Terminators. High Efficiency Linear Regulators. 5V to 3.3V Linear Regulators Motherboard Clock Supplies. SOT-223 Ordering Information Device CYT8117TXX CYT8117TA CYT8117TXXLF CYT8117TALF SOT-223 (Lead-free) Package VOUT Volts Fixed output voltages; XX denotes voltage options (1.5V, 1.8V, 2.5V, SOT-223 3.0V, and 3.3V). Adjustable output voltage. Fixed output voltages; XX denotes voltage options (1.5V, 1.8V, 2.5V, 3.0V, and 3.3V). Adjustable output voltage. Absolute Maximum Rating Symbol VIN θJA TJ TSTG TLEAD Parameter Input Supply Voltage Thermal Resistance Junction to Ambient SOT-223 Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering 10 Sec) Maximum 9 60 0 to 125 -40 to 150 260 Units V °C/W °C °C °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 (VIN - VOUT) = 1.5V, IOUT = 10mA, TA = 25°C, CYT8117T15 Min Typ Max Units 1.5 (-2%) 1.8 2.5 3.0 3.3 (-2%) ----1.250 (+2%) 0.3 0.4 10 48 0.2 1.1 4 1.8 0.07 175 0.003 35 ------------V % % mA µA µA V mA A %/°C °C %VO dB (+2%) V VO Output Voltage (1) CYT8117T18 CYT8117T25 CYT8117T30 CYT8117T33 VREF VSR VLR IQ IADJ ∆IADJ VD IO ICL TC OTP VN RA Notes: 1. 2. Reference Voltage (1) (Adj. Voltage Version) Line Regulation (1) Load Regulation (1) Quiescent Current Adjust Pin Current Adjust Pin Current Change Dropout Voltage (2) Minimum Load Current Current Limit Temperature Coefficient Thermal Protection RMS Output Noise Ripple Rejection Ratio (VIN - VOUT) = 1.5V IOUT = 10mA VOUT + 1.5V < VIN < 8V IOUT = 10mA (VIN - VOUT) = 1.5V 10mA ≤ IOUT ≤ 1A Fixed Output Version VOUT + 1.5V < VIN < 8V 10mA ≤ IOUT ≤ 1A ∆VREF = 1%, IOUT = 1A ------- TA = 25°C, 10Hz ≤ f ≤ 10kHz f = 120Hz, COUT = 22µF (Tantalum), (VIN - VOUT) = 3V, IOUT = 1A --- Low duty cycle pulse testing with which TJ remains unchanged. ∆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 CYT8117TA 2 VOUT = 1.5V VREF CIN 10uF 1 R1 124 Ohm COUT 22uF IADJ R2 24.9 Ohm Fixed Voltage Regulator VIN >= 4.8V 3 CYT8117T33 2 VOUT = 3.3V CIN 10uF 1 IQ COUT 22uF Preliminary and all contents are subject to change without prior notice. 3 1A Positive Voltage Regulators (Preliminary) Application Hints Like any linear voltage regulator, CYT8117 requires external capacitors to ensure stability. ensure performance. The external capacitors must be carefully selected to CYT8117 Thermal Considerations It is important that the thermal limit of the package is not exceeded. thermal protection. The CYT8117 has built-in 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] It 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. 2.5V. In other words, if IOUT(MAX) = 1A, then [VIN – VOUT] cannot exceed Input Capacitor An input capacitor of at least 10µF is required. Ceramic or Tantalum can be used. can be increase without upper limit. The value Output Capacitor An output capacitor is required for stability. 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. Preliminary and all contents are subject to change without prior notice. 4 1A Positive Voltage Regulators (Preliminary) CYT8117 Typical Performance Characteristics Reference Voltage vs Junction Temperature 1250 Reference Voltage (mV) 1245 1240 1235 1230 1225 1220 -25 0 25 50 75 100 125 150 Junction Temperature (C) Line Transients VIN = 4.5V – 5.5 V CIN = 0.1µF, COUT = 1µF Output Voltage vs Junction Temperature 3.70 3.65 3.60 Output Voltage 3.55 3.50 3.45 3.40 3.35 3.30 3.25 3.20 -25 0 25 50 75 100 125 150 Junction Temperature (C) Load Transients ILOAD = 10mA – 1A COUT = 22µF, CIN = 10µF D ropout Voltage vs Output Current 1.14 1.12 Dropout Voltage (V) 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 1A Positive Voltage Regulators (Preliminary) Outline Drawing for SOT-223 CYT8117 Preliminary and all contents are subject to change without prior notice. 6