NTLJF4156NTAG Discrete Semiconductor Products

Vgs(th) (Max) @ Id:	1V @ 250µA
Package / Case:	6-WDFN Exposed Pad
Supplier Device Package:	6-WDFN (2x2)
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 150°C (TJ)
Power Dissipation (Max):	710mW (Ta)
FET Feature:	Schottky Diode (Isolated)
Input Capacitance (Ciss) (Max) @ Vds:	427pF @ 15V
Vgs (Max):	±8V
Gate Charge (Qg) (Max) @ Vgs:	6.5nC @ 4.5V
Series:	--
Rds On (Max) @ Id, Vgs:	70 mOhm @ 2A, 4.5V
Drive Voltage (Max Rds On, Min Rds On):	1.5V, 4.5V
Current - Continuous Drain (Id) @ 25°C:	2.5A (Tj)
Drain to Source Voltage (Vdss):	30V
Technology:	MOSFET (Metal Oxide)
FET Type:	N-Channel
Part Status:	Active
Packaging:	Tape & Reel (TR)

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NTLJF4156NTAG Application Field and Working Principle

Introduction

The NTLJF4156NTAG is a low-side MOSFET gate driver highly optimized for synchronous buck DC/DC converter applications. The Driver includes an internally compensated error amplifier, high-side and low-side MOSFET drivers, and operational amplifiers. The design and easy-to-use feature of NTLJF4156NTAG provide significant cost saving and improved system performance. This paper discusses the application field and working principle of NTLJF4156NTAG.

Application Fields

1. Voltage regulator: The NTLJF4156NTAG can be used as a synchronous buck regulator. Its driver can provide a regulated voltage as high as 50V and offers improved efficiency and ultra-low quiescentcurrent operation. With the help of its high speed edge rate, it can provide better regulation, improved transient response and fast response.2. DC/DC converter: With its fast rise and fall time, the NTLJF4156NTAG can be used for high output current applications. It also provides low ripple, high efficiency and better control of frequency and voltage.3. Power supply: The NTLJF4156NTAG can be used to provide a regulated voltage or current driven to a load. The driver has adjustable current and voltage limits that help to protect and regulate the power supply from over-voltage and over-current conditions. It can also be used in applications requiring non-linear power control such as power sharing and peak power control.4. Motor control: The NTLJF4156NTAG can be used for motor control and other applications requiring high speed switching and low power consumption. Its driver is capable of driving high voltage motors within a given range of operation and offers improved speed control.

Working Principle

The NTLJF4156NTAG Gate Driver is an integrated circuit that uses two sections of complementary MOSFETs in an H-bridge configuration to drive a gate voltage. It includes two high side (G1 and G2) and two low side MOSFETs (G3 and G4). The NTLJF4156NTAG gate driver provides an internally compensated error amplifier to compensate for any parameter drift in the gate driver. It has a current monitor for current sensing in the gate driver and an adjustable ramp generator for soft-start and to minimize shoot-through current.The NTLJF4156NTAG gate driver operates in two modes: constant-voltage mode and constant-current mode. In constant-voltage mode, the voltage across the gate remains constant; this mode is used for low-side MOSFETs (G3, G4) and for high-side MOSFETs (G1, G2). In constant-current mode, the current through the gate remains constant; this mode is only used for high-side MOSFETs (G1, G2).The NTLJF4156NTAG also has an adjustable slew rate control which allows the gate driver to control the transition of the gate voltage between the two modes. This allows the driver to reduce both switching losses and EMI along with the circuit complexity.

Conclusion

NTLJF4156NTAG is highly optimized for synchronous buck DC/DC converter applications. The driver includes an internally compensated error amplifier, high-side and low-side MOSFET drivers, and operational amplifiers. It offers adjustable current and voltage limits, adjustable slew rate control and adjustable ramp generator for soft-start and to minimize shoot-through current. With the help of its high speed edge rate, it can provide better regulation, improved transient response and fast response in voltage regulator, DC/DC converters, power supplies and motor control applications.

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