Overview
The TPS65400-Q1, produced by Texas Instruments, is an integrated Power Management Unit (PMU) designed for applications requiring a small form factor and high power conversion efficiency. This device is optimized for use in space-constrained equipment that operates in high-ambient temperatures without the need for cooling. It features four high-current buck-switching regulators (SW1, SW2, SW3, and SW4) with integrated FETs, making it suitable for powering high-current digital circuits such as processors, FPGAs, ASICs, memory, and digital I/Os.
The TPS65400-Q1 can be powered from a single-input voltage rail between 4.5 and 18 V, making it compatible with 5- or 12-V intermediate power distribution buses. It provides a high level of flexibility through its PMBus-compatible I2C bus interface, allowing for runtime control and status monitoring.
Key Specifications
| Parameter | Test Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|
| Input Voltage Range | 4.5 | 18 | V | ||
| Output Voltage Range | 0.6 | 90% VIN | V | ||
| SW1, SW2 Current Limit | 2 | 4 | 6 | A | |
| SW3, SW4 Current Limit | 0.5 | 2 | 3 | A | |
| Switching Frequency Range | 275 kHz | 2.2 MHz | |||
| UVLO Threshold (Rising) | 4.25 | 4.48 | V | ||
| UVLO Threshold (Falling) | 3.4 | 3.75 | V | ||
| Junction-to-Ambient Thermal Resistance | 29.8 | °C/W |
Key Features
- High Efficiency: Up to 95% efficiency for each switching regulator.
- Adjustable Output Voltage: Output voltages can be set through external resistor networks, and VREF can be programmed from 0.6 to 1.87 V in 10-mV steps.
- Sequencing Control: Sequencing requirements can be met using individual enable pins or by programming the sequence through the I2C bus into the onboard EEPROM.
- Soft-Start and Prebiased Startup: Soft-start function minimizes discharge of the output when starting up in a prebiased condition.
- Protection Features: Internal undervoltage lockout (UVLO), overcurrent protection (OCP), overvoltage protection (OVP), and overtemperature protection (OTP).
- PMBus-Compatible I2C Interface: Allows for runtime control and status monitoring.
- Thermally Enhanced Package: 7-mm × 7-mm 48-pin, 0.5-mm pitch VQFN package.
- Current Sharing: Current sharing between SW1 and SW2 and between SW3 and SW4 allows support of higher current needs if required.
Applications
- Automotive Applications: Qualified for automotive use.
- Communications Infrastructure: Suitable for small cellular base stations (BTS), picocells, microcells, and macro BTS using multiple PMUs.
- Power over Ethernet (PoE): Compatible with PoE-powered systems.
- Industrial and Factory Automation: Ideal for systems requiring small form factor, high efficiency, and high-ambient operating temperature.
- Powering DSP and MCUs: Designed to power high-current digital circuits such as DSPs and MCUs.
Q & A
- What is the input voltage range of the TPS65400-Q1?
The input voltage range is from 4.5 to 18 V.
- What are the current limits for each switcher?
SW1 and SW2 support up to 4 A each, and SW3 and SW4 support up to 2 A each.
- How can the output voltages be adjusted?
Output voltages can be set through external resistor networks, and VREF can be programmed from 0.6 to 1.87 V in 10-mV steps.
- What protection features does the TPS65400-Q1 have?
The device includes internal undervoltage lockout (UVLO), overcurrent protection (OCP), overvoltage protection (OVP), and overtemperature protection (OTP).
- How does the TPS65400-Q1 handle sequencing?
Sequencing requirements can be met using individual enable pins or by programming the sequence through the I2C bus into the onboard EEPROM.
- What is the thermal resistance of the TPS65400-Q1 package?
The junction-to-ambient thermal resistance is 29.8 °C/W.
- What is the purpose of the soft-start function?
The soft-start function minimizes discharge of the output when starting up in a prebiased condition.
- Can the switching frequency be adjusted?
Yes, the switching frequency is independently adjustable up to 2.2 MHz for each regulator.
- What interface does the TPS65400-Q1 use for control and status monitoring?
The device uses a PMBus-compatible I2C bus interface.
- In what types of applications is the TPS65400-Q1 commonly used?
It is commonly used in automotive, communications infrastructure, Power over Ethernet (PoE), industrial and factory automation, and for powering DSP and MCUs.
