TCA62753FUG Datasheet, PDF (6/10 Pages) Toshiba Semiconductor – Charge Pump type DC/DC Converter for White LED Driver

TCA62753FUG
Usage Precautions
■About the capacitor
Please connect C/C_IN/C_OUT as much as possible near the pin for best performance.
Please select the ceramic capacitor that ESR (Equivalent Series Resistor) is low.
The input capacitor (C_IN) is effective to decrease the impedance of power supply and also input
current is averaged. The capacitance values of C_IN will recommend 1.0µF to 10µF.
The output capacitor (C_OUT) is effective to decrease the ripple noise of the output line.
The capacitance values of C_OUT will recommend 1.0µF to 10µF.
The flying capacitor (C) is a capacitor for the Step-up operation.
The capacitance values of C will recommend 1.0µF.
Capacitance values of the ceramic capacitor changes greatly depending on the temperature and the
input voltage.
Please confirm necessary Capacitance values can be secured in all temperatures and the total
applied voltages.
■About the output ability
This product outputs 5V ± 6% from the terminal V_OUT in input voltage V_IN = 2.7V or more.
The output current ability is 50mA at V_IN = 2.7V ~ 3.0V. Moreover, it is 100mA at V_IN = 3.0V or more.
■Thermal shutdown function
The thermal shutdown circuit works when the junction temperature exceeds 150°C (Typ.), and IC
stops operating.
Operation begins again when the junction temperature falls.
(This function is not included in the product inspection.)
■Others
*When the capacitor connected with C+ terminal and C- terminal comes off.
The step up operation is not done.
The power supply current flows because the current route is generated from the terminal VIN to
the terminal GND / the terminal VOUT.
However, the over current limitation function works, and the power supply current is limited to
250mA (Typ.).
*When the capacitor connected with I/O comes off
The step up operation is done. However, the voltage ripple of I/O grows, and the output ability
decreases.
*When terminal C+ and terminal C- are short-circuited
The step up operation is not done.
The power supply current flows because the current route is generated from the terminal VIN to
the terminal GND.
However, the over current limitation function works, and the power supply current is limited to
250mA (Typ.).
*When the terminal SHDN is an opening
The behavior of the IC is unpredictable if the input on the pin is undefined. Ensure that the pin is
tied to either “H” or “L” level.
*When the terminal VOUT is short-circuited to GND
The over current limitation function works, and the power supply current is limited to 250mA
(Typ.).
*When the terminal VOUT is an opening
The output voltage is controlled with 5V ± 6%.
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2006-10-25