3-V to 20-V, voltage mode synchronous buck controller with DCR current sensing
Product details
Parameters
Package | Pins | Size
Features
- Wide Input-Voltage Range of 3 V to 20 V
- Inductor DCR or Shunt Resistor Based Overcurrent Protection
- 0.6-V Reference With ±1% FB Accuracy Across Full –40°C to 125°C Junction Temperature Range
- Switching Frequency from 200 kHz to 1.2 MHz
- Output Voltage as High as 95% of Input Voltage
- Integrated High-Current MOSFET Drivers
- Internal VDD Bias Supply LDO Subregulator
- External Clock Synchronization
- Adjustable Soft Start With External Capacitor
- Prebiased Start-up Capability
- Power Supply Tracking
- Voltage-Mode Control With Line Feedforward
- Open-Drain Power-Good Indicator
- Precision Enable With Hysteresis
- 16-Pin HTSSOP and WQFN Packages
- Create a Custom Design Using the LM27402 With the WEBENCH® Power Designer
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Description
The LM27402 is a voltage-mode, synchronous, DC/DC step-down controller with lossless inductor DCR current sensing capability. Sensing the inductor current eliminates the need to add resistive powertrain elements, which increases overall efficiency and facilitates accurate, continuous current sensing. A 0.6-V ±1% voltage reference enables high accuracy and low voltage capability at the output. An input operating voltage range of 3 V to 20 V makes the LM27402 suitable for a large variety of input rails.
The LM27402 voltage-mode control loop incorporates input voltage feed forward to maintain stability throughout the entire input-voltage range. The switching frequency is adjustable from 200 kHz to
1.2 MHz. Dual, high-current, integrated MOSFET drivers support large QG, low RDS(on) power MOSFETs. A power-good indicator provides power-rail-sequencing capability and output fault detection. An adjustable external soft start limits inrush current and provides monotonic output control during start-up. Other features include external tracking of other power supplies, integrated LDO bias supply, and synchronization capability.
Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | LM27402 High-Performance Synchronous Buck Controller With DCR Current Sensing datasheet (Rev. K) | Feb. 23, 2018 |
Selection guide | Power Management Guide 2018 (Rev. R) | Jun. 25, 2018 | |
Application note | Common mistakes made in controller designs for power converters | Mar. 26, 2018 | |
Application note | Using DC/DC Controllers to Improve Bitcoin Miner Designs | Mar. 15, 2018 | |
Application note | Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics | Jul. 21, 2016 | |
Technical article | High Density PCB Layout of DC/DC Converters, Part 2 | Sep. 16, 2015 | |
Technical article | High Density PCB Layout of DC/DC Converters, Part 1 | Sep. 12, 2015 | |
User guide | AN-1992 LM27402 Evaluation Board (Rev. B) | May 06, 2013 | |
Application note | AN-2060 LM27402 Current Limit Application Circuits (Rev. A) | May 06, 2013 | |
Application note | Current Limit Foldback Improves Short Circuit Protection in LM274X Family (Rev. B) | Apr. 23, 2013 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
The LM27402 evaluation board represents a 20A typical application circuit. The application circuit is optimized for an input voltage of 12V. However, input voltage feed-forward technology allows the evaluation board to operate up to 20V while maintaining a stable output voltage of 1.5V at 20A (...)
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 PMP7882 BOM.pdf (108KB) -
download PMP7882 Gerber.zip (180KB)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
HTSSOP (PWP) | 16 | View options |
WQFN (RUM) | 16 | 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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Support & training
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