Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Topology | Synchronous buck controller with external high-side and low-side N-MOSFETs |
| Input | 6 V to 100 V |
| Output | Programmable from 1.215 V up to 80 V stated |
| Control | Emulated peak-current-mode |
| Gate Drive | 3.5 A peak stated |
| Frequency | 50 kHz to 1 MHz; free-run or synchronizable |
| Efficiency Features | Adaptive dead time, optional diode-emulation light-load mode, external bias switchover |
| Exact Package / Packing | HTSSOP (PWP), 20 pins with exposed pad; 2500-piece large reel; −40°C to +150°C; marking LM5116 MH |
Product Overview
LM5116MHX/NOPB is a high-voltage synchronous step-down controller, fundamentally different from the boost/SEPIC/flyback LM3478 and LM3481. It drives both high-side and low-side external NMOS devices to convert rails as high as 100 V down to lower regulated outputs.
Emulated peak-current-mode control provides cycle-by-cycle current behavior without relying on a noisy direct high-side current waveform. Adaptive dead time and diode-emulation mode balance efficiency across heavy and light loads.
The wide 6–100 V input range targets automotive, industrial and telecom supplies. The exposed-pad HTSSOP and 3.5-A gate drive require careful high-dV/dt layout around the external power MOSFETs.
For related devices, see HKEQGOO’s DC DC Switching Controllers category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | LM5116MHX/NOPB |
| Topology | Synchronous buck controller with external high-side and low-side N-MOSFETs |
| Input | 6 V to 100 V |
| Output | Programmable from 1.215 V up to 80 V stated |
| Control | Emulated peak-current-mode |
| Gate Drive | 3.5 A peak stated |
| Frequency | 50 kHz to 1 MHz; free-run or synchronizable |
| Efficiency Features | Adaptive dead time, optional diode-emulation light-load mode, external bias switchover |
| Exact Package / Packing | HTSSOP (PWP), 20 pins with exposed pad; 2500-piece large reel; −40°C to +150°C; marking LM5116 MH |
| Manufacturer Status | Active / Production |
| Part Marking | LM5116 MH |
Functional Highlights
100-V synchronous buck handles wide/high input rails efficiently
External MOSFET selection lets the design scale current while synchronous rectification avoids a large diode loss at high load.
Diode emulation improves light-load behavior
The low-side FET can stop reverse current during discontinuous conduction instead of forcing bidirectional inductor current.
Design Considerations
- Lay out both gate-drive loops and switch node compactly to control ringing and EMI.
- Select MOSFET voltage rating for the full 100-V-class transient environment with margin.
- Use UVLO, soft start, current limit and compensation values matched to the actual inductor/output network.
Product Status and Exact Order Code
Texas Instruments lists LM5116MHX/NOPB as Active / Production; HTSSOP (PWP), 20 pins; 2500-piece large tape and reel; −40°C to +150°C; marking LM5116 MH.
Related Engineering Resources
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