Automotive Grade 5.5-65V Wide Vin, Current Mode Dual Synchronous Buck Controller
Product details
Parameters
Package | Pins | Size
Features
- Qualified for Automotive Applications
- AEC-Q100 Qualified With the Following Results:
- Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range
- Device HBM ESD Classification Level 1C
- Device CDM ESD Classification Level C4A
- Emulated Peak Current Mode Control
- Wide Operating Range (5.5 V to 65 V)
- Easily Configurable for Dual Outputs or Interleaved Single Output
- Robust 3.3-A Peak Gate Drive
- Switching Frequency Programmable to 750 kHz
- Optional Diode Emulation Mode
- Programmable Output from 0.8 V
- Precision 1.5% Voltage Reference
- Programmable Current Limit
- Hiccup Mode Overload Protection
- Programmable Soft-Start
- Programmable Line Undervoltage Lockout
- Automatic Switch-Over to External Bias Supply
- Channel2 Enable Logic Input
- Thermal Shutdown
- Leadless 32-Pin WQFN Package
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Description
The LM5119Q device is a dual 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 switching frequency is programmable from 50 kHz to 750 kHz. The LM5119Q device 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 with automatic switch-over to external bias further improves efficiency. Additional features include thermal shutdown, frequency synchronization, cycle-by-cycle and hiccup mode current limit and adjustable line undervoltage lockout. The device is available in a power enhanced leadless 32-pin WQFN package featuring an exposed die attach pad to aid thermal dissipation.
Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | LM5119Q Wide Input Range Dual Synchronous Buck Controller datasheet | Jan. 29, 2018 |
White paper | Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) | Jul. 03, 2018 | |
More literature | LM5119 and LM25119 Design tool | Feb. 26, 2014 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
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Reference designs
Design files
-
download PMP11098 BOM.pdf (112KB) -
download PMP11098 Assembly Drawing (from PMP9227).pdf (77KB) -
download PMP11098 PCB (from PMP9227).pdf (349KB) -
download PMP11098 Altium.zip (3092KB) -
download PMP11098 Gerber.zip (228KB)
Design files
-
download PMP10979 BOM.pdf (137KB) -
download PMP10979 Assembly Drawings.pdf (413KB) -
download PMP10979 Gerber.zip (354KB)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
WQFN (RTV) | 32 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
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