LM25117 - Wide Input Range Synchronous Buck Controller with Analog Current Monitor

LM25117是TI德州仪器公司的一款控制器（外部开关）产品，LM25117是Wide Input Range Synchronous Buck Controller with Analog Current Monitor，本站介绍了LM25117的封装应用图解、特点和优点、功能等，并给出了与LM25117相关的TI元器件型号供参考。

LM25117 - Wide Input Range Synchronous Buck Controller with Analog Current Monitor - 控制器（外部开关） - DC/DC开关稳压器 - 德州仪器

产品特性

LM25117-Q1 is Qualified for Automotive Applications
AEC-Q100 Qualified With the Following Results:
- Device Temperature Grade 1: -40°C to 125°C Ambient Operating Temperature Range
Emulated Peak Current Mode Control
Wide Operating Range from 4.5 V to 42 V
Robust 3.3 A Peak Gate Drives
Adaptive Dead-time Output Driver Control
Free-run or Synchronizable Clock up to 750 kHz
Optional Diode Emulation Mode
Programmable Output from 0.8 V
Precision 1.5% Voltage Reference
Analog Current Monitor
Programmable Current Limit
Hiccup Mode Over Current Protection
Programmable Soft-start and Tracking
Programmable Line Undervoltage Lockout
Programmable Switch-over to External Bias Supply
Thermal Shutdown

产品应用

Automotive Infotainment
Industrial DC-DC Motor Drivers
Automotive USB Power
Telecom Server

产品说明

The LM25117 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 750 kHz. The LM25117 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 high voltage bias regulator that allows external bias supply further improves efficiency. The LM25117’s unique analog telemetry feature provides average output current information. Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line undervoltage lockout.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (NOM)
LM25117	HTSSOP (20) PWP	6.50 mm x 4.40 mm
LM25117-Q1	WQFN (24) RTW	4.00 mm x 4.00 mm

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