LDO, short for Low Dropout Regulator, is a class of regulators featuring an input-output voltage difference smaller than conventional 3-terminal fixed-output types, resulting in lower heat generation and greater efficiency.

Overcurrent protection circuits prevent IC damage due to load shorts. ROHM utilizes a foldback-type protection circuit that reduces the output current based on the output voltage.

TSD is an abbreviation for Thermal Shut Down, a type of temperature protection circuit that prevents IC damage due to excessive thermal stress by turning OFF the circuit once the chip temperature Tj exceeds a predetermined value. Operation is resumed once Tj decreases to within the normal range. A hysteresis of 20ºC is built in.

The overvoltage circuit protects the IC from damage due to excessive input voltages (i.e. 50V surge for <200ms).

This function controls IC operation. When turned ON the circuit operates normally, and when OFF the circuit current is effectively set to 0uA for lower power consumption.

Refers to the change in output voltage caused by fluctuations in the input voltage, under constant temperature and load conditions.

Refers to the change in output voltage caused by fluctuations in the output current, under constant temperature and load conditions.

Current not exceeding the absolute maximum ratings will not damage the IC. However, operation above or near the maximum value specified may trigger the overcurrent protection circuit, leading to operation shutdown. Please note that the current can fluctuate depending on external factors, including ambient temperature.

Multiple protection circuits are built in (TSD, OCP, OVP) in order to prevent IC and possible peripheral circuit damage due to various factors. Each protection circuit was designed to enable normal operation once particular conditions were met. Please note that the TSD (Temperature Shut Down) circuit features hysteresis.

Yes, although it is strongly advised that precautions be taken to prevent this situation from occurring, by placing a diode between the input and output terminals or in series input lines for backcurrent protection, for example. However, it has been confirmed that the IC will not be damaged by the discharge from the output capacitor, as long as the capacitance is less than 1000µF.

An output capacitor is necessary in order to prevent output oscillation. The ESR-Io stable operating region shows the relationship between the ESR of the capacitor and the stable operating region of the IC, and is measured using a ceramic capacitor and resistor connected in series. Therefore, it is highly recommended that operation be verified under actual usage conditions when using an electrolytic capacitor or a ceramic capacitor with a capacitance out of the recommended range, since this, along with the wiring and load impedances, will affect stable operating region.

There is no recommended diode in particular.
In practice the impedance will vary depending on a number of factors, including the components connected to the input/output lines, substrate pattern, part layout, and ambient temperature.
Therefore, it is recommended that the customer select the appropriate diode for reverse current by evaluating the actual set.
As a rule, it is advantageous to select a diode with low Vf and high current handling capability.

Since the NC pin is not connected internally, there should be no problems applying a voltage.

The heat sink is attached to the ground pin. Therefore, please connect it to ground.

For always ON operation, the output control pin should be connected to the input side. The CTL pin (also cally the the Shutdown Switch by ROHM) requires at least 2V for startup. In addition, for continuous operation we offer a 3-terminal type without a control pin.

Applicable products :
Standard Fixed Output LDO Regulators with Shutdown Switch
Standard Variable Output LDO Regulators with Shutdown Switch

ROHM products prevent failure due to excessive heat caused by overload conditions by utilizing a thermal shutdown circuit. Therefore, exceeding a junction temperature of 150ºC will not cause immediate failure. However, the absolute maximum rating should never be exceeded, since doing so - even momentarily - will decrease reliability and may result in failure.

The difference is the input voltage. Standard types feature a voltage resistance of 35V, while secondary regulators are designed for voltage input from primary stage regulators.

Applicable products :
Standard Fixed Output LDO Regulators
Secondary Fixed Output LDO Regulators

The input capacitor is connected to stabilize the line from the IC to the power supply. There should not be any problems with a larger input capacitance. However, an excessively small capacitance will result in unstable power supply IC operation.

Please consider the BA□□CC0FP series compatible with the BA□□FP lineup. The main differences are the output tolerance (4%→2%), operating temperature range (-40ºC to 85ºC→-40ºC-125ºC), and the overvoltage protection level (38V→28V). Please ensure characteristics and specifications when replacing.

Please refer to the relevant figure (overvoltage operation characteristics) in the technical notes. This function is designed to operated between the upper limit of the recommended operating range and the absolute maximum rating. Therefore, operation is not possible up to the max. rated value.