LP5907 datasheet(17/47 Pages) TI

17 / 47 page

s/DIV

VOUT

1V/DIV

SVA-30180515

100

s/DIV

VOUT

100 mV/DIV

LOAD

200 mA/DIV

SVA-30180514

LP5907

www.ti.com

SNVS798O – APRIL 2012 – REVISED JUNE 2020

Product Folder Links: LP5907

Submit Documentation Feedback

As a good design practice, keep the wiring parasitic inductance at a minimum, which means to use as wide as

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

layer as possible and avoiding vias on the path. If there is a need to use vias, implement as many as possible

vias between the connection layers. The recommendation is to keep parasitic wiring inductance less than 35 nH.

For the applications with fast load transients, it is recommended to use an input capacitor equal to or larger to

the sum of the capacitance at the output node for the best load transient performance.

8.2.2.8 No-Load Stability

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

8.2.2.9 Enable Control

The LP5907 may 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, while 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 1 µA.

Additionally, an output pulldown circuit is activated which ensures that any charge stored on COUT is discharged

to ground.

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

keep the regulator output permanently on.

An internal 1-MΩ pulldown resistor ties the EN input to ground, ensuring that the device remains off if the EN pin

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

above and below the specified turnon or turnoff voltage thresholds listed in the Electrical Characteristics under

VIL and VIH.

8.2.3 Application Curves

Figure 22. Start-Up

Figure 23. Load Transient Response

9 Power Supply Recommendations

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

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

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

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

LP5907 датащи(PDF) 17 Page - Texas Instruments

LP5907 датащи(HTML) 17 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47

датащи скачать

ссылки URL