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| UTC UR3325 LINEAR INTEGRATED CIRCUIT 2 CHANNEL LOW-DROPOUT VOLTAGE REGULATOR FEATURES *Dual Output: 3.3V/1A, 2.5V/1A. *Output Voltage Precision of 2%. *Output consists of PNP power transistor with low-dropout voltage. *Built-in over current protection circuit (OCP). *Built-in Thermal Shut Down Circuit (TSD). *Ideal for Hard Disk Drives applications. 1 TO-252-5 1: Vcc 2: NC 3: GND 4: Vo1 5: VO2 PIN DISCRIPTION PIN NO. 1 2 3 4 5 PIN NAME Vcc N.C. GND Vo1 Vo2 Power Supply Not internally connected Ground 3.3V Output 2.5V Output FUNCTION UTC UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R102-017,C UTC UR3325 BLOCK DIAGRAM Vcc PIN 1 LINEAR INTEGRATED CIRCUIT Vcc Reference Voltage + - Vcc Vo1 Current Limit Sat. Prevention PIN 4 Vcc Vcc + Vo2 Thermal Shut Down Current Limit Sat. Prevention PIN 5 NC PIN 2 PIN 3 GND UTC UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R102-017,C UTC UR3325 PARAMETER LINEAR INTEGRATED CIRCUIT SYMBOL RATINGS 18 1000* -40 ~ +85 -55 ~ +150 150 ABSOLUTE MAXIMUM RATINGS (Ta=25) UNIT V mW C C C Supply Voltage Vcc Power dissipation PD Operating temperature range Topr Storage temperature range Tstg Junction temperature Tj * PD derated at 8mW/ for temperatures above Ta=25 OPERATING RATINGS(Ta=25) PARAMETER Input Voltage 3.3V Output current 2.5V Output current SYMBOL Vcc Io1 Io2 MIN 3.0 MAX 16.0 1 1 UNIT V A A ELECTRICAL CHARACTERISTICS (Refer to the test circuit, Ta=25, VCC=5V unless otherwise specified.) PARAMETER Bias Current 3.3V Output Output Voltage 1 Dropout Voltage 1 Peak Output Current 1 Ripple Rejection 1 Line Regulation 1 SYMBOL IB Vo1 VD1 Io1 R.R.1 VLINE1 TEST CONDITIONS Io1=0mA, Io2=0mA Io1=500mA Io1=500mA, Vcc=3.135V f=120Hz, ein=1Vrms Io1=200mA Vcc=4V ~ 16V, Io1=500mA MIN TYP 0.8 MAX 1.5 3.366 0.5 UNIT mA V V A dB 3.234 1.0 50 3.30 0.25 1.7 58 5 30 0.01 270 30 75 mV mV %/ mA VLOAD1 Io1=0mA ~ 1A Load Regulation 1 Io1=5mA, TJ=0 ~ 125 Temperature Coefficient of Output TCVO1 Voltage 1* Short circuit Output Current 1 IOS1 Vcc=16V 2.5V Output Output Voltage 2 Vo2 Io2=500mA Peak Output Current 2 Io2 Ripple Rejection 2 f=120Hz, ein=1Vrms R.R.2 Io2=200mA VLINE2 Vcc=4V ~ 16V, Io2=500mA Line Regulation 2 VLOAD2 Io2=0mA ~ 1A Load Regulation 2 Io2=5mA, TJ=0 ~ 125 Temperature Coefficient of Output TCVO2 Voltage 2* Short circuit Output Current 2 IOS2 Vcc=16V * Design Guarantee. (Outgoing inspection is not done on all products.) This product is not designed for protection against radioactive rays. 2.450 1.0 50 2.50 1.7 58 5 30 0.01 270 2.550 V A dB 30 75 mV mV %/ mA Note: All characteristic are measured with a capacity across the input (0.33F) and the output (22F). Measurement is done at TATJ, and variations in the parameter of all measurement (except for Temperature Coefficient of Output Voltage)caused by temperature change are not considered. UTC UNISONIC TECHNOLOGIES CO., LTD. 3 QW-R102-017,C UTC UR3325 POWER DISSIPATION POWER DISSIPATION, PD (W) 12.5 10 7.5 5 2.5 0 LINEAR INTEGRATED CIRCUIT (1) With infinitc Aluminum heat sink j-c=12.5 (/W) (2) With no heat sink j-a=125.0(/W) (1) 10.0 (2) 1.0 0 25 50 75 100 125 150 AMBIENT TEMPERATURE, Ta () STANDARD APPLICATION CIRCUIT Vo1 Vcc GND Vo2 22F + OR + 22F 1 10F Ceramic OR 1 10F Ceramic TEST CIRCUIT FOR EACH CONDITION V Vo1 or Vo2 Vcc GND 0.33F A 22F + A Io UTC UNISONIC TECHNOLOGIES CO., LTD. 4 QW-R102-017,C UTC UR3325 LINEAR INTEGRATED CIRCUIT TEST CIRCUIT FOR RIPPLE REJECTION RATIO Vcc ein VIN 0.33F GND Vo1 or Vo2 22F + V Io APPLICATION INFORMATION Operation Supply Voltage Range The circuit functionality is guaranteed within operation of ambient temperature range, as long as it is within operation supply voltage range. The standard electrical characteristic values are guaranteed at the test circuit voltage of Vcc=5V. The cannot be guaranteed at other voltages in the operating range of 3.0V~16.0V, homever, the variation will be small. Input /Output characteristic VOUT Dropout Region Regulation Region Off Region 2V (Typ.TA=25) 3V Vin Recommended Operating Region For proper regulation, this device must be operated in the Recommended Operating Region shown above. Power Dissipation Refer to the thermal duration characteristics shown in Fig.3. Also, be sure to use this IC within a power dissipation rage allowing enough margins. Output and Bypass Capacitor To prevent oscillations, place the output capacitor between the output pin and GND for both channel. There is a possibility for oscillation if capacitor's value changes due to temperature, voltage, etc. More than 22F electrolytic capacitor is recommended. If an extremely large value of (over 1000F) is used, it may cause oscillations at low frequency. In case of using ceramic capacitor (it is recommended more than 10F) connect with 1 resistance UTC UNISONIC TECHNOLOGIES CO., LTD. 5 QW-R102-017,C UTC UR3325 LINEAR INTEGRATED CIRCUIT serially as ESR. For the bypass capacitor, a 0.33F capacitor placed as close to Vcc pin and GND pin as possible is recommended. Over- current Protection Circuit The over-current protection circuits are built in at the outputs. They protect the IC from being damaged when the load is short-circuited or subjected to an over current condition. This protection circuits perform holdback current limiting. Thermal Protection Circuit A thermal shut down circuit (T.S.D.) is built into the IC to prevent damage due to overheating, Therefore, all the outputs are turned off when the T.S.D. circuit is activated and are turned on when the temperature recedes to the specified level. However, the T.S.D. circuit is only for extreme conditions and the regulator circuit should still be designed for the IC not to exceed TJ(max)=150. Grounding It is recommended that every capacitor (bypass and output capacitors) is grounded to PIN3 using single-point connections. Electromagnetic Fields The IC is susceptible to strong electromagnetic fields and may cause malfunction. Therefore, caution should be used when placing it on the PCB. Protection Diodes It is recommended that protection diodes be used when the output is connected to an inductive load. UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UTC UNISONIC TECHNOLOGIES CO., LTD. 6 QW-R102-017,C |
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