ZL1505

Synchronous Step-Down MOSFET Drivers

OVERVIEW

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 Digital- DC™ 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.

KEY 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

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ZL1505
Basic Information
Production Status
Mass Production(*)
VIN/VPWM (max) (V)
5
VDRIVE (V)
7.5
Output Per Driver UGATE Source|Sink (A)
4|5
Output Per Driver LGATE Source|Sink (A)
3|3
No Load IS (max) (mA)
0.8
Qualification Level
Standard
Temperature Range
-40 to +125

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