LP5907 datasheet(16/50 Pages) TI2

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7.2.2.7 Remote Capacitor Operation

The LP5907 requires at least a 1µF capacitor at the OUT pin, but there are no strict requirements about the

location of the capacitor in regards to the pin. In practical designs the output capacitor can be located up to 10cm

away from the LDO. Which means that there is no need to have a special capacitor close to the output pin if

there is already respective capacitors in the system (such as a capacitor at the input of supplied device). The

remote capacitor feature helps minimize the number of capacitors in the system.

In general, keep the wiring parasitic inductance at a minimum, which means use traces as wide as possible from

the LDO output to the capacitors, thus keeping the LDO output trace layer as close to ground layer as possible

and avoiding vias on the path. If vias must be used, use as many vias as possible between the connection

layers. Keep parasitic wiring inductance less than 35nH. For applications with fast load transients, use an input

capacitor equal to or larger to the sum of the capacitance at the output node for best load transient performance.

7.2.2.8 No-Load Stability

The LP5907 remains stable, and in regulation, with no external load.

7.2.2.9 Enable Control

The LP5907 can be switched on or off by a logic input at the EN pin. A voltage on this pin greater than VIH turns

the device on, and a voltage less than VIL turns the device off.

When the EN pin is low, the regulator output is off and the device typically consumes less than 1μA. Additionally,

an output pulldown circuit is activated that makes sure any charge stored on COUT is discharged to ground.

If the application does not require the shutdown feature, the EN pin can be tied directly to the IN pin to keep the

regulator output permanently on.

An internal 1MΩ pulldown resistor ties the EN input to ground, making sure the device remains off if the EN pin

is left open circuit. To provide proper operation, the signal source used to drive the EN pin must be able to swing

above and below the specified turn-on or turn-off voltage thresholds listed in the Electrical Characteristics under

VIL and VIH.

7.2.3 Application Curves

s/DIV

VOUT

1V/DIV

SVA-30180515

Figure 7-2. Start-Up

100

s/DIV

VOUT

100 mV/DIV

LOAD

200 mA/DIV

SVA-30180514

Figure 7-3. Load Transient Response

7.3 Power Supply Recommendations

This device is designed to operate from an input supply voltage range of 2.2V to 5.5V. The input supply must

be well regulated and free of spurious noise. To make sure that the LP5907 output voltage is well regulated and

dynamic performance is optimum, the input supply must be at least VOUT + 1V. A minimum capacitor value of

1µF is required to be within 1cm of the IN pin.

LP5907

SNVS798Q – APRIL 2012 – REVISED JULY 2025

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