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LM5116MHX/NOPB

6-100V Wide Vin, Current Mode Synchronous Buck Controller

Manufacturer:

TI
Mfr.Part #:

LM5116MHX/NOPB
Datasheet:

LM5116MHX/NOPB Datasheet (PDF)
Vin (min) (V):

6
Vin (max) (V):

100
Vout (min) (V):

1.215
Vout (max) (V):

80
EDA/CAD Models:

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LM5116MHX/NOPB General Description

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.

Key Features

Emulated Peak Current Mode
Wide Operating Range Up to 100 V
Low I_Q 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

Specifications

Vin (min) (V)	6	Vin (max) (V)	100
Vout (min) (V)	1.215	Vout (max) (V)	80
Iout (max) (A)	20	Iq (typ) (mA)	4.6
Switching frequency (min) (kHz)	50	Switching frequency (max) (kHz)	1000
Features	Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification, UVLO adjustable	Operating temperature range (°C)	-40 to 150
Regulated outputs (#)	1	Number of phases	1
Rating	Catalog	Control mode	current mode
Type	Controller