DATASHEET
ZL1505 FN6845
Rev 3.00
February 25, 2011 Synchronous Step-Down MOSFET Drivers
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 DigitalDCв„ў 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 -40В°C to +125В°C junction …
