LM4510SDEV datasheet(11/23 Pages) TI1

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LM4510

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SNVS533C – SEPTEMBER 2007 – REVISED MAY 2013

ON/OFF CONTROL

The LM4510 shuts down when the EN pin is low. In this mode the feedback resistors and the load are

disconnected from the input in order to avoid leakage current flow and to allow the output voltage to drop to 0V.

The LM4510 turns on when EN is high. There is an internal pull-down resistor on the EN pin so the device is in a

normally off state.

SHORT CIRCUIT PROTECTION

When VOUT goes down to VIN–0.7V (typ.), the device stops switching due to the short-circuit protection circuitry

and the short-circuit output current is limited to IINIT_CHARGE.

FEEDBACK FAULT PROTECTION

The LM4510 features unique Feedback Fault Protection to maximize safety when the feedback resistor is not

properly connected to a circuit or the feedback node is shorted directly to ground.

Feedback fault triggers VOUT monitoring. During monitoring, if VOUT reaches a protection level, the device shuts

down. When the feedback network is reconnected and VOUT is lower than the OFF threshold level of Feedback

Fault Protection, VOUT monitoring stops. VOUT is then regulated by the control loop.

INPUT UNDER-VOLTAGE LOCK-OUT

The LM4510 has dedicated circuitry to protect the IC and the external components when the battery voltage is

lower than the preset threshold. This under-voltage lock-out with hysteresis prevents malfunctions during startup

or abnormal power off.

THERMAL SHUTDOWN

If the die temperature exceeds 150°C (typ.), the thermal protection circuitry shuts down the device. The switches

remain off until the die temperature is reduced to approximately 140°C (typ.).

Application Information

ADJUSTING OUTPUT VOLTAGE

The output voltage is set using the feedback pin and a resistor voltage divider (RF1, RF2) connected to the output

as shown in the Typical Application Circuit.

The ratio of the feedback resistors sets the output voltage.

RF2 Selection

First of all choose a value for RF2 generally between 10 kΩ and 25 kΩ.

RF1 Selection

Calculate RF1 using the following equation:

(1)

Table 1 gives suggested component values for several typical output voltages.

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