Overview
The TDA21472 power stage, produced by Infineon Technologies, is a highly integrated power management solution designed for high-frequency, low-profile DC-DC converters. This component combines a low quiescent-current synchronous buck gate-driver IC with a Schottky diode and high-side and low-side MOSFETs in a single package. The design is optimized for PCB layout, heat transfer, and minimal switch node ringing, making it ideal for voltage regulators in CPUs, GPUs, and DDR memory arrays.
Key Specifications
| Parameter | Symbol | Values | Unit | Note/Test Condition |
|---|---|---|---|---|
| Input Voltage Range | VIN | 4.25 - 16 | V | |
| Current Sense Gain | ACS | 4.8 - 5.2 | mV/A | |
| Temperature Sense Slope | ATOUT_GAIN | 7.8 - 8.2 | mV/°C | 0°C ≤ TJ ≤ 125°C |
| Temperature Sense Offset Voltage | VTOUT_OFFSET | 1.108 - 1.132 | V | TJ = 65°C |
| Enable Power-on Delay | tEN_DELAY_ON | - 5 | μs | PWM=0 |
Key Features
- Low quiescent-current synchronous buck gate-driver IC co-packaged with Schottky diode and high-side and low-side MOSFETs.
- Internal MOSFET current sense algorithm with temperature compensation for superior current sense accuracy.
- Cycle-by-cycle over current protection with programmable threshold, VCC/VDRV UVLO protection, phase fault detection, IC temperature reporting, and thermal shutdown.
- Auto-replenishment of the bootstrap capacitor to prevent over-discharging.
- Deep-sleep power saving mode to reduce power consumption in PS3/PS4 mode.
- Body-Braking mode to reduce output voltage overshoot during load release events.
- Diode emulation mode controlled by PWM tri-state signal.
- External fault signal on the TOUT/FLT pin for detecting shorted high-side MOSFET, prolonged over current, or over-temperature conditions.
Applications
- CPU voltage regulators
- GPU voltage regulators
- DDR memory arrays
Q & A
- What is the input voltage range of the TDA21472?
The input voltage range is 4.25 to 16 volts. - What is the current sense gain of the TDA21472?
The current sense gain is between 4.8 and 5.2 mV/A. - How does the TDA21472 handle temperature sensing?
The TDA21472 features a temperature sense slope of 7.8 to 8.2 mV/°C and a temperature sense offset voltage. - What protection features does the TDA21472 include?
The TDA21472 includes cycle-by-cycle over current protection, VCC/VDRV UVLO protection, phase fault detection, IC temperature reporting, and thermal shutdown. - Does the TDA21472 support any power-saving modes?
Yes, it supports a deep-sleep power saving mode to reduce power consumption in PS3/PS4 mode. - How does the Body-Braking mode work in the TDA21472?
The Body-Braking mode reduces output voltage overshoot during load release events by turning off the low-side MOSFET and channeling the current through its body diode. - Can the TDA21472 be controlled by PWM signals?
Yes, the TDA21472 PWM input is compatible with industry standard 3.3V PWM input with tri-state. - What is the purpose of the TOUT/FLT pin in the TDA21472?
The TOUT/FLT pin provides an external fault signal for detecting shorted high-side MOSFET, prolonged over current, or over-temperature conditions. - How does the TDA21472 improve current sense accuracy?
The TDA21472 uses an internal MOSFET current sense algorithm with temperature compensation, which achieves superior current sense accuracy compared to controller-based inductor DCR sense methods. - What is diode emulation mode in the TDA21472?
Diode emulation mode is controlled by the PWM tri-state signal and is used to enhance system performance.
