| Vin (Min) (V) | 6 |
| Vin (Max) (V) | 42 |
| Vout (Min) (V) | 1.215 |
| Vout (Max) (V) | 36 |
| 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 |
| Regulated outputs (#) | 1 |
| Number of phases | 1 |
| Rating | Catalog |
- Emulated Peak Current Mode
- Wide Operating Range (Up to 42 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 36 V
- Precision 1.5% Voltage Reference
- Programmable Current Limit
- Programmable Soft Start
- Programmable Line Undervoltage Lockout
- Automatic Switch to External Bias Supply
- 20-Pin HTSSOP Exposed Pad
- Thermal Shutdown
The LM25116 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 using an emulated current ramp. Current mode control provides inherent line feedforward, 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 LM25116 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 20-pin HTSSOP package featuring an exposed die attach pad to aid thermal dissipation.
