LM27222SD/NOPB.A中文资料德州仪器数据手册PDF规格书

1FEATURES

2• Adaptive Shoot-through Protection

• 10ns Dead Time

• 8ns Propagation Delay

• 30ns Minimum On-time

• 0.4Ω Pull-down and 0.9Ω Pull-up Drivers

• 4.5A Peak Driving Current

• MOSFET Tolerant Design

• 5μA Quiescent Current

• 30V Maximum Input Voltage in Buck

Configuration

• 4V to 6.85V Operating Voltage

• SOIC-8 and WSON Packages

APPLICATIONS non•

High Current Buck And Boost Voltage

Converters

• Fast Transient DC/DC Power Supplies

• Single Ended Forward Output Rectification

• CPU And GPU Core Voltage Regulators

DESCRIPTION

The LM27222 is a dual N-channel MOSFET driver

designed to drive MOSFETs in push-pull

configurations as typically used in synchronous buck

regulators. The LM27222 takes the PWM output from

a controller and provides the proper timing and drive

levels to the power stage MOSFETs. Adaptive shoot- through protection prevents damaging and efficiency

reducing shoot-through currents, thus ensuring a

robust design capable of being used with nearly any

MOSFET. The adaptive shoot-through protection

circuitry also reduces the dead time down to as low

as 10ns, ensuring the highest operating efficiency.

The peak sourcing and sinking current for each driver

of the LM27222 is about 3A and 4.5Amps

respectively with a Vgs of 5V. System performance is

also enhanced by keeping propagation delays down

to 8ns. Efficiency is once again improved at all load

currents by supporting synchronous, non•

synchronous, and diode emulation modes through the

LEN pin. The minimum output pulse width realized at

the output of the MOSFETs is as low as 30ns. This enables high operating frequencies at very high

conversion ratios in buck regulator designs. To

support low power states in notebook systems, the

LM27222 draws only 5μA from the 5V rail when the

IN and LEN inputs are low or floating.