The TPS4000x are controllers for low-voltage, non-isolated synchronous buck regulators. These controllers drive an N-channel MOSFET for the primary buck switch, and an N-channel MOSFET for the synchronous rectifier switch, thereby achieving very high-efficiency power conversion. In addition, the device controls the delays from main switch off to rectifier turn-on and from rectifier turn-off to main switch turn-on in such a way as to minimize diode losses (both conduction and recovery) in the synchronous rectifier with TI’s proprietary Predictive Gate Drive™ technology. The reduction in these losses is significant and increases efficiency. For a given converter power level, smaller FETs can be used, or heat sinking can be reduced or even eliminated.
The current-limit threshold is adjustable with a single resistor connected to the device. The TPS4000x controllers implement a closed-loop soft start function. Startup ramp time is set by a single external capacitor connected to the SS/SD pin. The SS/SD pin is also used for shutdown.
PowerPAD and Predictive Gate Drive are trademarks of Texas Instruments Incorporated.
| Vin (min) (V) | 2.25 |
| Vin (max) (V) | 5.5 |
| Vout (min) (V) | 0.7 |
| Vout (max) (V) | 4 |
| Iout (max) (A) | 15 |
| Iq (typ) (mA) | 1.5 |
| Switching frequency (min) (kHz) | 300 |
| Switching frequency (max) (kHz) | 300 |
| Features | Enable, Synchronous Rectification |
| Operating temperature range (°C) | -40 to 85 |
| Regulated outputs (#) | 1 |
| Number of phases | 1 |
| Rating | Catalog |
| Control mode | Voltage mode |
| Type | Controller |
| HVSSOP (DGQ) | 10 | 14.7 mm² 3 x 4.9 |
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