LM5145 datasheet(17/60 Pages) TI1

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8.3 Feature Description

8.3.1 Input Range (VIN)

The LV5144 operational input voltage range is from 6 V to 95 V. The device is intended for step-down

conversions from 12-V, 24-V, 48-V, 60-V, and 72-V unregulated, semiregulated, and fully-regulated supply rails.

The application circuit in Figure 8-1 shows all the necessary components to implement an LV5144-based

wide-VIN step-down regulator using a single supply. The LV5144 uses an internal LDO subregulator to provide a

7.5-V VCC bias rail for the gate drive and control circuits (assuming the input voltage is higher than 7.5 V plus

the necessary subregulator dropout specification).

BST

PGND

SS/TRK

COMP

AGND

VIN

VOUT

LV5144

OUT

SYNC

GND

SYNCOUT

SYNCIN

EN/UVLO

VIN

ILIM

PGOOD

SYNC out

VCC

OUT

ILIM

VCC

BST

UV2

UV1

FB2

FB1

optional

ILIM

Figure 8-1. Schematic Diagram for VIN Operating Range of 6 V to 95 V

In high-voltage applications, take extra care to ensure the VIN pin does not exceed the absolute maximum

voltage rating of 95 V during line or load transient events. Voltage ringing on the VIN pin that exceeds the values

in the Absolute Maximum Ratings can damage the IC. Use high-quality ceramic input capacitors to minimize

ringing. An RC filter from the input rail to the VIN pin (for example, 4.7 Ω and 0.1 µF) provides supplementary

filtering at the VIN pin.

8.3.2 Output Voltage Setpoint and Accuracy (FB)

The reference voltage at the FB pin is set at 0.8 V with a feedback system accuracy over the full junction

temperature range of ±1%. Junction temperature range for the device is –40°C to +125°C. While dependent

on switching frequency and load current requirements, the LV5144 is generally capable of providing an output

voltage in the range of 0.8 V to a maximum of 60 V or slightly less than VIN, whichever is lower. The DC output

voltage setpoint during normal operation is set by the feedback resistor network, RFB1 and RFB2, connected to

the output.

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LV5144

SNVSCJ1 – AUGUST 2023

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LM5145 Datasheet(PDF) 17 Page - Texas Instruments

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