UR3325

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

7 of 8

www.unisonic.com.tw

QW-R102-017.F

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, however, the

variation will be small.

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Input /Output characteristic

Dropout Region Regulation Region

Recommended Operating Region

Off Region

2V

3V

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 page 4. 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 22μF electrolytic

capacitor is recommended. If an extremely large value of (over 1000μF) is used, it may cause oscillations at low

frequency. In case of using ceramic capacitor (it is recommended more than 10μF) connect with 1Ω resistance

serially as ESR. For the bypass capacitor, a 0.33μF 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

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.