| Vin (Min) (V) | 6 |
| Vin (Max) (V) | 100 |
| Vout (Min) (V) | 1.215 |
| Vout (Max) (V) | 80 |
| Iout (Max) (A) | 20 |
| Iq (Typ) (uA) | 4600 |
| Switching frequency (Min) (kHz) | 50 |
| Switching frequency (Max) (kHz) | 1000 |
| Features | Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Synchronous Rectification, UVLO Adjustable |
| Regulated outputs (#) | 1 |
| Number of phases | 1 |
| Rating | Catalog |
- Emulated Peak Current Mode
- Wide Operating Range Up to 100 V
- Low IQ Shutdown (< 10 μA)
- Drives Standard or Logic Level MOSFETs
- Robust 3.5-A Peak Gate Drive
- Free-run or Synchronous Operation to 1 MHz
- Optional Diode Emulation Mode
- Programmable Output from 1.215 V to 80 V
- Precision 1.5% Voltage Reference
- Programmable Current Limit
- Programmable Soft-Start
- Programmable Line Undervoltage Lockout
- Automatic Switch to External Bias Supply
- HTSSOP-20 Exposed Pad
- Thermal Shutdown
- Create a Custom Design Using the LM5116 with the WEBENCH Power Designer
The LM5116 is a synchronous buck controller intended for step-down regulator applications from a high-voltage or widely varying input supply. The control method is based upon current mode control utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting, and ease-of-loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high-input voltage applications.
The operating frequency is programmable from 50 kHz to 1 MHz. The LM5116 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation, for improved efficiency at light load conditions. A low quiescent current shutdown disables the controller and consumes less than 10 μA of total input current.
Additional features include a high-voltage bias regulator, automatic switch-over to external bias for improved efficiency, thermal shutdown, frequency synchronization, cycle-by-cycle current limit, and adjustable line undervoltage lockout. The device is available in a power enhanced HTSSOP-20 package featuring an exposed die attach pad to aid thermal dissipation.
