Overview
The NCP81253AMNTBG, produced by onsemi, is a high-performance dual MOSFET gate driver designed for synchronous buck converter applications. It is optimized to drive the gates of both high-side and low-side power MOSFETs in a compact 2 mm x 2 mm DFN8 thermally-enhanced package. This driver is particularly suited for power solutions in notebook and desktop systems, and it is compatible with single-phase IMVP8 controllers such as the NCP81206.
Key Specifications
| Symbol | Parameter | Min | Typ | Max |
|---|---|---|---|---|
| VCC | Main Supply Voltage | -0.3 V | 6.5 V | |
| BST | Bootstrap Supply Voltage | -0.3 V wrt/SW | 35 V wrt/GND | |
| SW | Switch Node Voltage | -5 V | 35 V | |
| DRVH | High-Side Driver Output | -0.3 V wrt/SW | BST + 0.3 V wrt/SW | |
| DRVL | Low-Side Driver Output | -0.3 V | VCC + 0.3 V | |
| PWM, EN | DRVH/DRVL Control Input, Enable Pin | -0.3 V | 6.5 V | |
| TSTG | Storage Temperature Range | -55°C | 150°C |
Key Features
- Space-efficient 2 mm x 2 mm DFN8 thermally-enhanced package
- VCC range of 4.5 V to 5.5 V
- Internal bootstrap diode to minimize external components
- 5 V 3-stage PWM input
- Diode braking capability via EN mid-state
- Adaptive anti-cross conduction circuit to protect against cross-conduction during FET turn-on and turn-off
- Output disable control to turn off both MOSFETs via the enable pin
- VCC undervoltage lockout (UVLO) function
- Pb-free, halogen-free/BFR-free, and RoHS compliant
Applications
The NCP81253 is designed for power solutions in notebook and desktop systems. It is particularly suited for synchronous buck converter topologies and is compatible with single-phase IMVP8 controllers such as the NCP81206.
Q & A
- What is the primary function of the NCP81253?
The NCP81253 is a dual MOSFET gate driver designed to drive the gates of both high-side and low-side power MOSFETs in synchronous buck converter applications.
- What is the package type and size of the NCP81253?
The NCP81253 comes in a 2 mm x 2 mm DFN8 thermally-enhanced package.
- What is the VCC supply voltage range for the NCP81253?
The VCC supply voltage range is from 4.5 V to 5.5 V.
- Does the NCP81253 have an internal bootstrap diode?
- How does the PWM input work on the NCP81253?
The PWM input is a 3-stage input where PWM = High enables DRVH and disables DRVL, PWM = Mid disables both DRVH and DRVL, and PWM = Low enables DRVL and disables DRVH.
- What is the purpose of the VCC UVLO function?
The VCC undervoltage lockout (UVLO) function ensures that the outputs are low when the supply voltage is low.
- Is the NCP81253 RoHS compliant?
- What are the typical applications for the NCP81253?
The NCP81253 is typically used in power solutions for notebook and desktop systems.
- How does the adaptive anti-cross conduction circuit work?
The adaptive anti-cross conduction circuit protects against cross-conduction during FET turn-on and turn-off by introducing a delay between the turn-off of one MOSFET and the turn-on of the other.
- What is the maximum power dissipation supported by the NCP81253?
The maximum power dissipation is dependent on the board design and layout, but it can dissipate up to 1.05 W under certain conditions.
