4.5-36V, 3A Current Mode Synchronous Buck Regulator
Product details
Parameters
Package | Pins | Size
Features
- 4.5V to 36V Input Voltage Range
- 3A Output Current, 5.2A Peak Current
- 130 mΩ/110 mΩ Integrated Power MOSFETs
- 93% Peak Efficiency with Synchronous Rectification
- 1.5% Feedback Voltage Accuracy
- Current Mode Control, Selectable Compensation
- Fixed 500 kHz Switching Frequency
- Adjustable Output Voltage Down to 0.8V
- Compatible with Pre-biased Loads
- Programmable Soft-start with External Capacitor
- Precision Enable Pin with Hysteresis
- Integrated OVP, UVLO, PGOOD
- Internally Protected with Peak Current Limit, Thermal Shutdown and Restart
- Accurate Current Limit Minimizes Inductor Size
- Non-linear Current Mode Slope Compensation
- 20-Pin HTSSOP Exposed Pad Package
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Description
The LM20323 is a full featured 500kHz synchronous buck regulator capable of delivering up to 3A of load current. The current mode control loop is externally compensated with only two components, offering both high performance and ease of use. The device is optimized to work over the input voltage range of 4.5V to 36V making it well suited for high voltage systems.
The device features internal Over Voltage Protection (OVP) and Over Current Protection (OCP) circuits for increased system reliability. A precision Enable pin and integrated UVLO allows the turn-on of the device to be tightly controlled and sequenced. Startup inrush currents are limited by both an internally fixed and externally adjustable soft-start circuit. Fault detection and supply sequencing are possible with the integrated power good (PGOOD) circuit.
The LM20323 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track a higher voltage rail using the SS/TRK pin. If the output of the LM20323 is pre-biased at startup it will not sink current to pull the output low until the internal soft-start ramp exceeds the voltage at the feedback pin.
The LM20323 is offered in an exposed pad 20-pin HTSSOP package that can be soldered to the PCB, eliminating the need for bulky heatsinks.
Technical documentation
| Type | Title | Date | |
|---|---|---|---|
| * | Datasheet | LM20323 36V, 3A 500 kHz Synchronous Buck Regulator datasheet (Rev. C) | Apr. 03, 2013 |
| Technical articles | Minimize the impact of the MLCC shortage on your power application | Mar. 29, 2019 | |
| Selection guides | Power Management Guide 2018 (Rev. R) | Jun. 25, 2018 | |
| User guides | AN-1790 LM20323 Evaluation Board (Rev. B) | May 05, 2013 | |
| User guides | AN-1792 LM20343 Evaluation Board (Rev. B) | May 05, 2013 | |
| Application notes | AN-2077 LM20k POL Module (Rev. A) | May 03, 2013 |
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
- (...)
Reference designs
Design files
-
download PMP10487 REVC PCB.pdf (5163KB) -
download PMP10487 Altium.zip (22325KB) -
download PMP10487 Gerber.zip (392KB) -
download PMP10487 BOM (Rev. A).pdf (105KB) -
download PMP10487 Assembly Drawing (Rev. A).pdf (47KB)
CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| HTSSOP (PWP) | 20 | View options |
Ordering & quality
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