4.5-75V Wide Vin, Constant On-Time Non-Synchronous PFET Buck Controller
Product details
Parameters
Package | Pins | Size
Features
- LM5085-Q1 is an Automotive Grade Product that
is AEC-Q100 Grade 1 Qualified (–40°C to 125°C
Operating Junction Temperature) - Wide 4.5-V to 75-V Input Voltage Range
- Adjustable Current Limit Using RDS(ON) or a
Current Sense Resistor - Programmable Switching Frequency to 1MHz
- No Loop Compensation Required
- Ultra-Fast Transient Response
- Nearly Constant Operating Frequency with Line
and Load Variations - Adjustable Output Voltage from 1.25 V
- Precision ±2% Feedback Reference
- Capable of 100% Duty Cycle Operation
- Internal Soft-start Timer
- Integrated High Voltage Bias Regulator
- Thermal Shutdown
- Package:
- HVSSOP-8
- VSSOP-8
- WSON-8
Description
The LM5085 is a high efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, efficient buck regulator for a wide range of applications. This high voltage controller contains a PFET gate driver and a high voltage bias regulator which operates over a wide 4.5-V to 75-V input range. The constant on-time regulation principle requires no loop compensation, simplifies circuit implementation, and results in ultrafast load transient response. The operating frequency remains nearly constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The PFET architecture allows 100% duty cycle operation for a low dropout voltage. Either the RDS(ON) of the PFET or an external sense resistor can be used to sense current for over-current detection.
Technical documentation
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
The LM5085 evaluation board provides the design engineer with a fully functional buck regulator, employing the LM5085 PFET switching controller which uses the constant on-time (COT) operating principle. The evaluation board provides a 5V output over an input range of 5.5V to 55V. The circuit (...)
Features
- Input Voltage: 5.5V to 55V, 60V maximum
- Output Voltage: 5V
- Maximum load current: 4.5A for VIN >8V
- Minimum load current: 0A
- Current Limit Threshold: â 7.6A
- Measured Efficiency: 97.2% (VIN 5.5V, IOUT = 0.6Amps)
- Nominal Switching Frequency: 300 kHz
- Size: 3.1 in. x 1.5 in. x 0.78 in
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
- (...)
Reference designs
Design files
-
download PMP9103 BOM.pdf (24KB) -
download PMP9103 Assembly Drawing.pdf (47KB)
Design files
-
download PMP7821 BOM.pdf (113KB) -
download PMP7821 Gerber.zip (231KB)
Design files
-
download PMP7767 BOM.pdf (97KB)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
HVSSOP (DGN) | 8 | View options |
VSSOP (DGK) | 8 | View options |
WSON (NGQ) | 8 | 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
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
Support & training
TI E2E™ forums with technical support from TI engineers
Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.
If you have questions about quality, packaging or ordering TI products, see TI support.