UCC27288 3-A 120-V Half-Bridge Driver with 8-V UVLO and External Bootstrap Diode
1 Features
- Drives two N-channel MOSFETs in high-side low-side configuration
- 16-ns typical propagation delay
- 12-ns rise, 10-ns typical fall time with 1800-pF load
- 1-ns typical delay matching
- Configurable external bootstrap diode
- 8-V typical undervoltage lockout
- Absolute maximum negative voltage handling on inputs (–5 V)
- Absolute maximum negative voltage handling on HS (–14 V)
- ±3-A peak output current
- Absolute maximum boot voltage 120 V
- Inputs are independent of each other and VDD
- Under voltage lockout for both channels
- Specified from –40°C to 140°C junction temperature
2 Applications
3 Description
The UCC27288 is a robust N-channel MOSFET driver with a maximum switch node (HS) voltage rating of 100 V. It allows for two N-channel MOSFETs to be controlled in half-bridge or synchronous buck configuration based topologies. Its 3-A peak source and sink current along with low pull-up and pull-down resistance allows the UCC27288 to drive large power MOSFETs with minimum switching losses during the transition of the MOSFET Miller plateau. Since the inputs are independent of the supply voltage, UCC27288 can be used in conjunction with both analog and digital controllers. Two inputs are completely independent of each other and therefore provides added control design flexibility.
The input pins as well as the HS pin are able to tolerate significant negative voltage, which improves system robustness. The inputs are completely independent of each other. This allows for control flexibility where two outputs can be overlapped by overlapping inputs if needed. Small propagation delay and delay matching specifications minimize the dead-time requirement which improves system efficiency.
Under voltage lockout (UVLO) is provided for both the high-side and low-side driver stages forcing the outputs low if the VDD voltage is below the specified threshold. No integrated bootstrap diode allows user to use application-appropriate external bootstrap diode. UCC27288 is offered in an SOIC8 package to improve system robustness in harsh environments.
| PART NUMBER | PACKAGE (SIZE)(1) |
|---|---|
| UCC27288 | SOIC8 (6 mm x 5mm) |
4 Revision History
Changes from Revision A (October 2020) to Revision B (April 2022)
- Updated typcal peak pullup/pulldown current from +2.5A/-3.5A to ±3A in Electrical CharacteristicsGo
- Updated IHBS typical leakage to 5.0μA and test voltage from 110V to 100V in Electrical CharacteristicsGo
Changes from Revision * (June 2020) to Revision A (October 2020)
- Changed marketing status from Advance Information to initial release. Go
Changes from Revision () to Revision ()
5 Pin Configuration and Functions
Figure 5-1 D Package
8-Pin SOIC
Top View| PIN | I/O(1) | DESCRIPTION | |
|---|---|---|---|
| Name | D | ||
| HB | 2 | P | High-side bootstrap supply. The external bootstrap diode and the external bootstrap capacitor is required to generate bootstrap supply from VDD. Connect positive side of the bootstrap capacitor and cathode of an external diode to this pin. The external diode should be 100V (minimum) rated. Higher voltage rated diode is acceptable too. Typical recommended value of HB bypass capacitor is 0.1 μF, This value primarily depends on the gate charge of the high-side MOSFET. |
| HI | 5 | I | High-side input. |
| HO | 3 | O | High-side output. Connect to the gate of the high-side power MOSFET or one end of external gate resistor, when used. |
| HS | 4 | P | High-side source connection. Connect to source of high-side power MOSFET. Connect negative side of bootstrap capacitor to this pin. |
| LI | 6 | I | Low-side input |
| LO | 8 | O | Low-side output. Connect to the gate of the low-side power MOSFET or one end of external gate resistor, when used. |
| VDD | 1 | P | Positive supply to the low-side gate driver. Decouple this pin to VSS. Typical decoupling capacitor value is 1 μF. When using an external boot diode, connect the anode to this pin. If series resistor is used in series with the boot diode then connect one end of series boot resistor to this pin and other end of the resistor should be connected to the anode of the external boot diode. |
| VSS | 7 | G | Negative supply terminal for the device which is generally the system ground. |
