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Analog Devices LTC7803JMSE#PBF — Analog & Data Acquisition

LTC7803JMSE#PBF Synchronous Buck Controller, 100kHz–3MHz

MPNLTC7803JMSE#PBF
End of Life

Analog Devices LTC7803JMSE#PBF, low-IQ synchronous buck controller, step-down, 4.5V–40V input, 100kHz–3MHz switching, 100% duty cycle, -40°C to 150°C, 16-MSOP-EP exposed pad, tube.

$6.85Ref. price · indicative, final on quote
Packaging16-TFSOP (0.118", 3.00mm Width) Exposed Pad
RoHSROHS3 Compliant
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LTC7803JMSE#PBF specifications
ParameterValue
Output typeTransistor Driver
MountingSurface Mount
Voltage - supply (Vcc (Vdd))4.5V ~ 40V
Frequency100kHz ~ 3MHz
I/O channels1
Output phases1
Duty cycle100%
Operating temperature-40°C ~ 150°C (TJ)
PackageTube
FunctionStep-Down
TopologyBuck
Clock syncYes
Case16-TFSOP (0.118\", 3.00mm Width) Exposed Pad
Control featuresEnable, Frequency Control, Phase Control
Output configurationPositive
Synchronous rectifierYes

Product details

The LTC7803JMSE#PBF is a low quiescent current synchronous step-down (buck) controller from Analog Devices, designed for converting 4.5 V to 40 V input rails down to a regulated positive output. It drives external N-channel MOSFETs in a single-phase synchronous topology, which means the low-side FET replaces the freewheeling diode for higher efficiency across the load range. The controller integrates clock synchronization, frequency control, and phase control, making it suitable for multi-rail systems where switching harmonics must be aligned or spread.

100% duty cycle — what it means for dropout

The LTC7803JMSE#PBF can operate at 100% duty cycle, meaning the high-side FET can stay on continuously. This keeps the output in regulation when the input voltage sags close to the output target.

Switching frequency: 100 kHz to 3 MHz — inductor and EMI trade-offs

Lower frequencies reduce switching losses and simplify layout but require larger inductors.

Frequently asked questions

What is the switching frequency range of LTC7803JMSE#PBF?

The switching frequency is programmable from 100 kHz to 3 MHz via the frequency control pin, and the controller supports external clock synchronization.

Does LTC7803JMSE#PBF have synchronous rectification?

Yes, the LTC7803JMSE#PBF is a synchronous buck controller — it drives both high-side and low-side N-channel MOSFETs for rectification, which improves efficiency compared to an asynchronous diode-based design.

Can LTC7803JMSE#PBF achieve 100% duty cycle?

Yes, the LTC7803JMSE#PBF supports 100% duty cycle operation. This allows the output to stay in regulation when the input voltage drops close to the output voltage, effectively eliminating dropout.

What is the closest functional alternative to LTC7803JMSE#PBF?

The LT8390AIUFD#PBF is a buck-boost controller with a similar feature set (clock sync, synchronous rectification, transistor driver output) but operates in step-up/step-down topology and has a lower maximum duty cycle of 95% and a lower temperature rating of 125°C. The LTC7803JMSE#PBF is a pure step-down controller with 100% duty cycle and 150°C junction rating, so they are not pin-compatible drop-in replacements but serve adjacent power-conversion needs.