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LP5907-Q1

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SNVSA34E – SEPTEMBER 2014 – REVISED DECEMBER 2019

Product Folder Links: LP5907-Q1

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7.3 Feature Description

7.3.1 LP5907-Q1 Voltage Options

Table 1 lists the available voltage options for the LP5907-Q1 SOT-23 package.

Table 1. Voltage Options

SOT-23 PACKAGE ORDER NUMBER

VOLTAGE OPTION (V)

LP5907QMFX-1.2Q1

1.2

—

1.3

—

1.5

LP5907QMFX-1.8Q1

1.8

LP5907QMFX-2.5Q1

2.5

LP5907QMFX-2.8Q1

2.8

2.85

2.9

LP5907QMFX-3.0Q1

3.0

LP5907QMFX-3.3Q1

3.3

LP5907QMFX-3.8Q1

3.8

LP5907QMFX-4.5Q1

4.5

7.3.2 Enable (EN)

The LP5907-Q1 EN pin is internally held low by a 1-MΩ resistor to GND. The EN pin voltage must be higher than

the VIH threshold to ensure that the device is fully enabled under all operating conditions. The EN pin voltage

must be lower than the VIL threshold to ensure that the device is fully disabled and the automatic output

discharge is activated.

7.3.3 Low Output Noise

Any internal noise at the LP5907-Q1 reference voltage is reduced by a first order low-pass RC filter before it is

passed to the output buffer stage. The low-pass RC filter has a –3 dB cut-off frequency of approximately 0.1 Hz.

7.3.4 Output Automatic Discharge

The LP5907-Q1 output employs an internal 230-Ω (typical) pulldown resistance to discharge the output when the

EN pin is low, and the device is disabled.

7.3.5 Remote Output Capacitor Placement

The LP5907-Q1 requires at least a 1-µF capacitor at the OUT pin, but there are no strict requirements about the

location of the capacitor in regards the OUT pin. In practical designs, the output capacitor may be located up to

10 cm away from the LDO.

7.3.6 Thermal Overload Protection (TSD)

Thermal shutdown disables the output when the junction temperature rises to approximately 160°C which allows

the device to cool. When the junction temperature cools to approximately 145°C, the output circuitry enables.

Based on power dissipation, thermal resistance, and ambient temperature, the thermal protection circuit may

cycle on and off. This thermal cycling limits the dissipation of the regulator and protects it from damage as a

result of overheating.

The thermal shutdown circuitry of the LP5907-Q1 has been designed to protect against temporary thermal

overload conditions. The thermal shutdown circuitry was not intended to replace proper heat-sinking.

Continuously running the LP5907-Q1 device into thermal shutdown may degrade device reliability.