4.5-V TO 18-V input, 3A/2A/2A output, synchronous triple buck converter
Product details
Parameters
Package | Pins | Size
Features
- Wide Input Supply Voltage Range (4.5 to 18 V)
- 0.8 V, 1% Accuracy Reference
- Continuous Loading: 3 A (Buck 1),
2 A (Buck 2 and 3) - Maximum Current: 3.5 A (Buck 1),
2.5 A (Buck 2 and 3) - Adjustable Switching Frequency
300 kHz to 2.2 MHz Set by External Resistor - Dedicated Enable for Each Buck
- External Synchronization Pin for Oscillator
- External Enable/Sequencing and Soft-Start Pins
- Adjustable Current Limit Set By External Resistor
- Soft-Start Pins
- Current-Mode Control With Simple Compensation Circuit
- Powergood
- Optional Low-Power Mode Operation for Light Loads
- VQFN Package, 40-Pin 6 mm × 6 mm RHA
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Description
The TPS65251 features three synchronous wide input range high efficiency buck converters. The converters are designed to simplify its application while giving the designer the option to optimize their usage according to the target application.
The converters can operate in 5-, 9-, 12- or 15-V systems and have integrated power transistors. The output voltage can be set externally using a resistor divider to any value between 0.8 V and close to the input supply. Each converter features enable pin that allows a delayed start-up for sequencing purposes, soft-start pin that allows adjustable soft-start time by choosing the soft-start capacitor, and a current limit (RLIMx) pin that enables designer to adjust current limit by selecting an external resistor and optimize the choice of inductor. The current mode control allows a simple RC compensation.
The switching frequency of the converters can either be set with an external resistor connected to ROSC pin or can be synchronized to an external clock connected to SYNC pin if needed. The switching regulators are designed to operate from 300 kHz to 2.2 MHz. 180° out of phase operation between Buck 1 and Buck 2, 3 (Buck 2 and 3 run in phase) minimizes the input filter requirements.
TPS65251 features a supervisor circuit that monitors each converter output. The PGOOD pin is asserted once sequencing is done, all PG signals are reported and a selectable end of reset time lapses. The polarity of the PGOOD signal is active high.
TPS65251 also features a light load pulse skipping mode (PSM) by allowing the LOW_P pin tied to V3V. The PSM mode allows for a reduction on the input power supplied to the system when the host processor is in standby (low-activity) mode.
Technical documentation
| Type | Title | Date | |
|---|---|---|---|
| * | Datasheet | TPS65251 4.5-V to 18-V Input, High-Current, Synchronous Step-Down Three Buck Switcher With Integrated FET datasheet (Rev. G) | Feb. 16, 2018 |
| Application notes | Measure Power Stage Gain and Slope Compensation in PCM (Peak Current Mode) BUCK (Rev. A) | Apr. 01, 2019 | |
| Technical articles | Minimize the impact of the MLCC shortage on your power application | Mar. 29, 2019 | |
| Selection guides | Power Management Units for Embedded Processors (Rev. G) | Jan. 18, 2013 | |
| Application notes | TPS65250/1/2/3 LAYOUT GUIDE | Jan. 15, 2013 | |
| Application notes | TPS65250/1/2/3 Output Filter Selection Guidelines | Jan. 15, 2013 | |
| Selection guides | Power Management for Altera Cyclone FPGAs (Rev. A) | Mar. 15, 2011 | |
| User guides | TPS65251 High Current, Synchronous Step Down Three Buck Switcher EVM (Rev. A) | Aug. 26, 2010 |
Design & development
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- Simultaneous RGB LED operation
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Features
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Description
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Features
- Wide Input Supply Voltage Range (4.5 V to 18 V)
- 0.8 V, 1% Accuracy Reference
- Continuous Loading: 3 A (Buck 1), 2 A (Buck 2 and 3)
- Maximum Current: 3.5 A (Buck 1), 2.5 A (Buck 2 and 3)
- Adjustable Switching Frequency, 300 kHz - 2.2 MHz Set By External Resistor
- Dedicated Enable for Each Buck
- External (...)
Design tools & simulation
Reference designs
Design files
Design files
Design files
Design files
CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| VQFN (RHA) | 40 | View options |
Ordering & quality
Support & training
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Training series
View all TI training and videosVideos
Power Tips: Layout for a Buck Power Stage
This video shows a simplified schematic and PCB layout for a buck converter
