Overview
The TPS51120RHBT is a highly sophisticated dual-channel synchronous buck controller produced by Texas Instruments. This controller is designed to operate directly from a three- or four-cell Li-ion battery, providing high-power and 5-V and/or 3.3-V standby regulation for downstream circuitry in systems such as notebook computers. It features high-current, 100-mA, 5-V or 3.3-V on-board linear regulators with glitch-free switch over to SMPS, which can be kept alive independently during standby state. The controller supports a pseudo-constant frequency adaptive on-time control scheme, simplified loop compensation, and seamless transition to reduced frequency operation at light-load conditions.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 32-pin VQFN (RHB) with Exposed Pad |
| Operating Temperature Range (°C) | -40 to 85 |
| Supply Input Voltage Range (V) | 4.5 to 28 |
| Number of Outputs | 2 |
| Output Configuration | Positive |
| Topology | Buck |
| Synchronous Rectifier | Yes |
| Internal Reference Accuracy | Less than 1% |
| Control Features | Enable, On Time Control, Power Good |
Key Features
- 3.3-V and 5-V 100-mA Bootstrapped Standby Regulators with Independent Enables
- Selectable D-CAP™ Mode for Fast Transient Response Less than 100 ns
- Selectable Low Ripple Current Mode
- Low-side RDS(on) Loss-less Current Sensing and RSENSE Accurate Current Sense Option
- Internal Soft-Start and Integrated VOUT Discharge Transistors
- Integrated 2-V Reference and Adaptive Gate Drivers with Integrated Boost Diode
- Power Good for Each Channel with Delay Timer and Fault Disable Mode
- Dynamic UVP Supports VIN Line Sag Without Latch Off
Applications
The TPS51120RHBT is primarily designed for use in notebook computer systems, providing high-power and standby regulation for downstream circuitry. It is also suitable for other applications requiring dual-channel synchronous buck conversion with advanced features such as fast transient response, low ripple current, and accurate current sensing.
Q & A
- What is the operating temperature range of the TPS51120RHBT?
The operating temperature range is -40°C to 85°C.
- What is the supply input voltage range of the TPS51120RHBT?
The supply input voltage range is 4.5 V to 28 V.
- How many output channels does the TPS51120RHBT have?
The TPS51120RHBT has two output channels.
- What is the topology of the TPS51120RHBT?
The topology is synchronous buck.
- Does the TPS51120RHBT support D-CAP mode?
Yes, it supports selectable D-CAP mode for fast transient response.
- What is the internal reference accuracy of the TPS51120RHBT?
The internal reference accuracy is less than 1%.
- Does the TPS51120RHBT have integrated soft-start and discharge transistors?
Yes, it has internal soft-start and integrated VOUT discharge transistors.
- What are the control features of the TPS51120RHBT?
The control features include enable, on time control, and power good for each channel.
- How does the TPS51120RHBT handle VIN line sag?
The TPS51120RHBT supports dynamic UVP, which handles VIN line sag without latch off.
- What is the package type of the TPS51120RHBT?
The package type is 32-pin VQFN (RHB) with an exposed pad.
