CYT 6508 150mA CMOS LDO Regulator Features General Description The CYT6508 series of fixed output low dropout linear regulators are designed for portable battery powered applications, which require low noise environment, fast enable response time, and low dropout voltage. An optional bypass capacitor can be added for better low-noise performance. Each device contains a voltage reference unit, an error amplifier, a PMOS power transistor, and resistors for setting output voltage, and current limit and temperature limit protection circuits. The CYT6508 has been designed to be used with low cost capacitors and requires a minimum output capacitor of 1.0µF. Standard voltage versions are 1.5, 1.8, 2.5, 2.8, 3.0, and 3.3V. Excellent Noise Rejection at 62 dB. ■ Typical 200mV dropout voltage at 75mA. ■ Excellent Line and Load Regulation. ■ Fast Enable Turn-On Time of 20µs ■ Typical Low Ground Current at 50µA ■ Typical Disable Current Less than 0.3µA ■ Thermal Protection. ■ Standard SOT-23-5 package. ■ Available in Lead-Free Packages. ■ Applications ■ ■ ■ ■ ■ ■ Digital camera USB removable devices Portable DVD players MPEG4 devices Wireless LAN’s Cellphones SOT-23-5 Package ShenZhen CYT IC Design CO ,Ltd 1 CYT 6508 Pin Configuration 1.VIN 2.GND 3.EN 4.BYPASS 5.VOUT SOT-23-5 Typical Application VIN=5V VIN ON CIN:2.2uF OFF VOUT CYT6508-3.3V EN BYPASS GND VOUT=3.3V COUT:2.2uF CB:0.1uF Block Diagram ShenZhen CYT IC Design CO ,Ltd 2 CYT 6508 Ordering/Marking Information CYT6508- X X X Yield periods: A-Z : 1-26 a-z : 27-52 Package Type: L : SOT-23-5L P : SOT-323-5L Output Voltage: A : 3.3V B : 2.8V C : 2.5V D : 1.8V E : 1.5V F : 3.0V Operating Rating (1) Parameter Symbol Value Units Supply Input Voltage VIN +2.0 to +5.5 V Junction Temperature TJ 0 to +125 ℃ Absolute Maximum Rating (2) Parameter Symbol Value Units Input Supply Voltage VIN 6 V Enable Voltage VEN -0.3 to VIN V Output Voltage VOUT -0.3 to VIN V Power Dissipation PD Internally Limited (3) Output Short Circuit Duration Infinite Thermal Resistance, Junction-to-Ambient ӨJA Lead Temperature (Soldering,5 sec.) 230 ℃/W 260 ℃ Junction Temperature TJ 0 to +150 ℃ Storage Temperature TS -40 to +150 ℃ ShenZhen CYT IC Design CO ,Ltd 3 CYT 6508 Electrical Characteristics VIN = 5V; IOUT = 10mA, CIN = 2.2µF; COUT = 2.2µF; Symbol TJ = 25°C; unless otherwise specified. Parameter Conditions Min Typ Max Units VOUT Output Voltage Accuracy CYT6508-1.5V CYT6508-1.8V CYT6508-2.5V CYT6508-2.8V CYT6508-3.0V CYT6508-3.3V 1.470 1.764 2.450 2.744 2.940 3.234 1.5 1.8 2.5 2.8 3.0 3.3 1.530 1.836 2.550 2.856 3.060 3.366 V △VOUT/△T Output Voltage Temperature Coefficient Note4 -- 0.033 -- mV/℃ △VOUT/VOUT Line Regulation VIN=VOUT+1V to 6V,IOUT=10mA (VOUT=3.3V) -- 1.0 -- ％/V △VOUT/VOUT Load Regulation(5) VIN=5V IOUT=10 to 150mA (VOUT=3.3V) -- 1.0 -- ％ IOUT=10mA -- 20 -- IOUT=75mA -- 200 -- IOUT=150mA -- 500 -- Thermal Protection Temperature -- 150 -- Protection Hysterisys -- 20 -- F=120Hz -- 62 -- VEN=0V -- 0.3 -- VEN=VTH(EN) ; IOUT=10mA -- 65 -- Voltage Increasing, Output Tums On, Logic High 1.6 -- -- Voltage Decreasing, Output Tums Off, Logic Low -- -- 0.4 VOUT=0V -- 300 -- VIN-VOUT TPROTECTION (6) Dropout Voltage Thermal Protection PSRR Ripple Rejection IQ Quiescent Current VTH(EN) ILIMIT Enable Input Threshold Voltage Current Limit mV ℃ dB uA V mA Note 1: The device is not guaranteed to function outside its operating rating. Note 2: Exceeding the absolute maximum rating may damage the device. Note 3: The maximum allowable power dissipation at any TA (ambient temperature) is calculated using: PD(MAX) =(TJ(MAX) – TA)/ΘJA. Exceeding the maximum allowable power dissipation will result in excessive die temperature,and the regulator will go into thermal shutdown. See “Thermal Consideration” section for details Note 4: Output voltage temperature coefficient is the worst case voltage change divided by the total temperature range. ShenZhen CYT IC Design CO ,Ltd 4 CYT 6508 Note 5: Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range from 0.1mA to150mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification. Note 6: Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V differential. Application Hints Like any low dropout regulator, CYT6508 requires external capacitors to ensure stability. The external capacitors must be carefully selected to ensure performance. Input Capacitor An input capacitor of at least 1µF 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 1µF but may be increase without limit. Thermal Considerations It is important that the thermal limit of the package is not exceeded. The CYT6508 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 230°C/W for CYT6508 CYT6508 is designed to enter thermal protection at 150°C. For example, if TA is 25°C then the maximum PD is limited to about 0.6W. In other words, if IOUT(MAX) = 150mA, then [VIN – VOUT] cannot exceed 3.6V. ShenZhen CYT IC Design CO ,Ltd 5 CYT 6508 Typical Performance Characteristics ShenZhen CYT IC Design CO ,Ltd 6 CYT 6508 Outline Drawing SOT-23-5 DIM A B C D E F H J K N DIMENSIONS INCHES MM MIN MAX MIN MAX 0.110 0.120 2.80 3.05 0.059 0.070 1.50 1.75 0.036 0.051 0.90 1.30 0.014 0.020 0.35 0.50 - 0.037 - 0.95 - 0.075 - 1.90 - 0.006 - 0.15 0.0035 0.008 0.090 0.20 0.102 0.118 2.60 3.00 ShenZhen CYT IC Design CO ,Ltd 7