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Texas Instruments LM5109BSD/NOPB — Power Management (PMIC / Gate Driver)

LM5109BSD/NOPB Half-Bridge Gate Driver, 1A Peak

MPNLM5109BSD/NOPB
End of Life

Texas Instruments LM5109BSD/NOPB, half-bridge N-Channel MOSFET gate driver, 2 independent drivers, 8V-14V supply, 108V max bootstrap, 1A peak source/sink, 15ns rise/fall, -40°C to 125°C, 8-WSON exposed pad.

$1.68Ref. price · indicative, final on quote
Texas Instruments LM5109BSD/NOPB datasheet (PDF)
Packaging8-WDFN Exposed Pad
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LM5109BSD/NOPB specifications
ParameterValue
Gate typeN-Channel MOSFET
Input typeNon-Inverting
Channel typeIndependent
MountingSurface Mount
Supply voltage8V ~ 14V
Logic voltage - VIL, VIH0.8V, 2.2V
High side voltage - max (Bootstrap)108 V
Current - peak output (Source, sink)1A, 1A
Operating temperature-40°C ~ 125°C (TJ)
PackageTape & Reel (TR); Cut Tape (CT)
Case8-WDFN Exposed Pad
Number of drivers2
Driven configurationHalf-Bridge
Rise (Fall time)15ns, 15ns

Product details

Half-bridge driver for N-channel MOSFETs

It delivers 1A peak source and sink current with 15ns rise and fall time. The bootstrap supply handles up to 108 V on the high side.

Bootstrap voltage and external diode

The high-side driver uses a bootstrap technique requiring an external diode and capacitor between the VDD and HB pins. The maximum bootstrap voltage is 108 V.

Logic input compatibility

Logic input thresholds are 0.8 V for VIL and 2.2 V for VIH. The inputs are non-inverting and independent per channel.

No internal deadtime

The LM5109BSD/NOPB does not include internal deadtime. The two driver channels are independent, so shoot-through prevention relies on external deadtime inserted in the PWM signals. For motor drive or synchronous buck applications, the controller or MCU must ensure complementary switching with a deadtime interval appropriate for the MOSFET gate charge and load current.

The device is housed in an 8-WSON (4x4 mm) exposed pad package.

No last-time-buy or end-of-life notice applies. ROHS3 compliant.

Frequently asked questions

Does LM5109BSD/NOPB require an external bootstrap diode?

Yes, an external bootstrap diode and capacitor are required between VDD and HB. No internal diode is integrated.

Is LM5109BSD/NOPB compatible with 5V logic inputs?

Yes. The VIH threshold is 2.2 V, so 5 V logic levels drive the inputs reliably. VIL is 0.8 V.

Does LM5109BSD/NOPB have internal deadtime?

No. The two channels are independent with no internal deadtime. External deadtime must be provided by the controller or MCU.

What are the alternatives for LM5109BSD/NOPB?

A close functional alternative is the LM5106MM/NOPB, which is also a half-bridge N-channel MOSFET driver but with synchronous channel type and 1.2 A peak output current. Verify pin compatibility and bootstrap requirements for your layout.