1. Overview
1.1. Features
鈮?/div>
40A per Phase
Supports Switching Frequency up to 1.4MHz
>5A Sink Low-side Driver
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
RoHS Compliant, Pb-free
Exposed Pad 3 x 3mm DFN-10 Package
1.3. Description
The FD1505 is an integrated high-speed, high-current
N-channel MOSFET driver for synchronous step-down
DC-DC conversion applications. When used with
Digital-DC鈩?PWM controllers, the FD1505 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 FD1505
combines a 5A, 0.5惟 low-side driver and a 3A, 0.8惟
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 range 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 FD1505 is specified over a wide -40擄C to 125擄C
junction temperature range and is available in an
exposed-pad, DFN-10 package.
HSEL
1.2. Applications
High-Efficiency, High-Current DC-DC Buck
Converters with Digital Control and PMBus鈩?/div>
Multi-Phase Digital DC-DC converters with Phase
Adding/Dropping
Power Train Modules
Synchronous Rectification for Secondary Side
Isolated Power Converters
V
DD
PWMH
Level
shift
PWML
Shoot-
through
Protection
BST
GH
SW
V
DD
GL
FD1505
GND
LSEL
IMPORTANT NOTE:
For additional information, please contact
digitalpower@fairchildsemi.com
.
Figure 1.
Block Diagram
漏 2008 Fairchild Semiconductor Corporation
FD1505 鈥?Rev. 1.3.1
www.fairchildsemi.com
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