ZL1505_10 Datasheet, PDF (1/13 Pages) Intersil Corporation – Synchronous Step-Down MOSFET Drivers

Synchronous Step-Down MOSFET Drivers
ZL1505
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.
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 V_IN, V_OUT, I_OUT, F_SW and MOSFET
combinations
• Internal non-overlap watchdog prevents
shoot-through currents
Applications*(see page 12)
• 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
Related Literature*(see page 12)
• FN6846 ZL2004 Adaptive Digital DC/DC Controller
with Current Sharing
VDD
PWMH
PWML
HSEL
Level
shift
Shoot-
through
Protection
VDD
ZL1505
GND LSEL
FIGURE 1. ZL1505 BLOCK DIAGRAM
BST
GH
SW
GL
November 12, 2010
FN6845.2
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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