The ZL1505 is an integrated high-speed, high-current

N-channel MOSFET driver for synchronous step-down DC/DC

conversion applications. When used with Zilker Labs DigitalDC™ PWM controllers, the ZL1505 enables dynamically

adaptive dead-time control that optimizes efficiency under all

operating conditions. A dual input PWM configuration enables

this efficiency optimization while minimizing complexity within

the driver.

Operating from a 4.5V to 7.5V input, the ZL1505 combines a

5A, 0.5W low-side driver and a 3A, 0.8W high-side driver to

support high step-down buck applications. A unique adjustable

gate drive current scheme allows the user to adjust the drive

current on both drivers to optimize performance for a wide

rage of input/output voltages, load currents, power MOSFETs

and switching frequencies up to 1.4MHz. An integrated 30V

bootstrap Schottky diode is used to charge the external

bootstrap capacitor. An internal watchdog circuit prevents

excessive shoot-through currents and protects the external

MOSFET switches.

The ZL1505 is specified over a wide -40°C to +125°C junction

temperature range and is available in an exposed pad DFN-10

package.

Features

• High-speed, high-current drivers for synchronous N-channel

MOSFETs

• Adaptive dead-time control optimizes efficiency when used

with Digital-DC controllers

• Integrated 30V bootstrap Schottky diode

• Capable of driving 40A per phase

• Supports switching frequency up to 1.4MHz

- >4A source, >5A sink low-side driver

- >3A source/sink high-side driver

- <10ns rise/fall times, low propagation delay

• Adjustable gate drive strength optimizes efficiency for

different VIN, VOUT, IOUT, FSW and MOSFET combinations

• Internal non-overlap watchdog prevents shoot-through

currents

Applications

• High efficiency, high-current DC/DC buck converters with

digital control and PMBus™

• Multi-phase digital DC/DC converters with phase

adding/dropping

• Power train modules

• Synchronous rectification for secondary side isolated power

converters