UCC27289 3-A 120-V Half-Bridge Driver with 8-V UVLO and Negative Voltage Handling
1 Features
- Drives two N-channel MOSFETs in high-side low-side configuration
Enable/disable functionality in DRC package
Low current (7-μA) consumption when disabled
- 16-ns typical propagation delay
- 12-ns rise, 10-ns fall time with 1800-pF load (typical)
- 1-ns typical delay matching
- Integrated 100V 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 UCC27289 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 UCC27289 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, UCC27289 can be used in conjunction with both analog and digital controllers. Two inputs are completely independent of each other and thus two outputs can be overlapped by overlapping inputs, if needed. The enable and disable functionality provides additional system flexibility by reducing power consumption by the driver and responds to fault events within the system.
The input pins as well as the HS pin are able to tolerate significant negative voltage, which improves system robustness. 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. An integrated bootstrap diode eliminates the need for an external discrete diode in many applications, which saves board space and reduces system cost. UCC27289 is offered in multiple packages to accommodate system requirements such as robustness in harsh environments and density in compact applications.
| PART NUMBER | PACKAGE (SIZE)(1) |
|---|---|
| UCC27289D | SOIC8 (6mm x 5mm) |
| UCC27289DRC | SON10 (3mm x 3mm) |
| UCC27289DRM | SON8 (4mm x 4mm) |
| UCC27289DPR | SON10 (4mm x 4mm) |
5 Pin Configuration and Functions
Figure 5-1 D
Package8-Pin SOICTop View
Figure 5-3 DRM
Package8-Pin SONTop View
Figure 5-2 DRC
Package10-Pin SONTop View
Figure 5-4 DPR Package10-Pin SONTop View| PIN | I/O(1) | DESCRIPTION | ||||
|---|---|---|---|---|---|---|
| Name | DRC | DRM | DPR | D | ||
| EN | 6 | n/a | n/a | n/a | I | Enable input. When this pin is pulled high, it will enable the driver. If left floating or pulled low, it will disable the driver. 1 nF filter capacitor is recommended for high-noise systems. |
| HB | 3 | 2 | 2 | 2 | P | High-side bootstrap supply. The bootstrap diode is on-chip but 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 | 7 | 5 | 7 | 5 | I | High-side input. |
| HO | 4 | 3 | 3 | 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 | 5 | 4 | 4 | 4 | P | High-side source connection. Connect to source of high-side power MOSFET. Connect negative side of bootstrap capacitor to this pin. |
| LI | 8 | 6 | 8 | 6 | I | Low-side input |
| LO | 10 | 8 | 10 | 8 | O | Low-side output. Connect to the gate of the low-side power MOSFET or one end of external gate resistor, when used. |
| NC | 2 | n/a | 5,6 | n/a | - | Not connected internally. |
| VDD | 1 | 1 | 1 | 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 | 9 | 7 | 9 | 7 | G | Negative supply terminal for the device which is generally the system ground. |
| Thermal Pad | - | - | - | n/a | - | Connect to a large thermal mass trace (generally IC ground plane) to improve thermal performance. This can only be electrically connected to VSS. |
