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IXYS
IXS839 / IXS839A / IXS839B
Synchronous Buck MOSFET Driver
Features:
? Logic Level Gate Drive Compatible
? 2A Source, 4A Sink Peak Drive Current
? Programmable High-Side Driver Turn-on Delay
? Supports Floating Voltage for Top Driver Up to
24V
? IXS839/839B: Undervoltage Lockout
? IXS839A/B: Output Shutdown, Low Side
Shutdown Inputs
? 10μA Shut Down Current
? 2mA Quiescent Current (Non- Switching)
? Bootstrapped High Side Driver
? Cross-Conduction Protection
Applications:
? Multiphase Desktop CPU Supplies
? Mobile CPU Core Voltage supplies
? High Current / Low Voltage DC/DC
Synchronous Buck Converters
Figure 1. IXS839 Functional Block Diagram
and General Application Circuit
General Description
The IXS839/IXS839A/IXS839B are 2A Source / 4A
Sink Synchronous Buck MOSFET Drivers. These
Synchronous Buck MOSFET Drivers are specifically
designed to drive two N-channel power MOSFETs
in a synchronous buck converter. The High-Side
driver is powered via a bootstrapped power
connection. The driver is capable of 20ns High-Side
output, and 18ns Low-Side output transition times
driving a 3000pF load.
The IXS839 and IXS839B incorporate an
undervoltage lockout to prevent unintentional gate
drive output during low voltage conditions. The
IXS83A/B include External Shutdown and Low-Side
Drive Shutdown features. Simultaneous shutdown
of both outputs prevents rapid output capacitor
discharge. The high-side turn-on delay is adjustable
with an external capacitor added at the DLY pin.
The IXS839/839A/839B are designed to operate
over a temperature range of -40°C to +85°C. The
IXS839 is available in an 8-Lead SOIC, the
IXS839A and the IXS839B in a 10-pin QFN.
Figure 2. IXS839A Functional Block Diagram
and General Application Circuit
5V
VIN
5V
VIN
4
VDD
8
VDD
UVLO
1
BST
DBST
3
BST
DBST
PWM
2
OVERLAP
PROTECTION
CIRCUIT
8
7
HGD
SW
CBST
Q1
VOUT
SD
PWM
4
5
OVERLAP
PROTECTION
CIRCUIT
2
1
HGD
SW
CBST
Q1
VOUT
DLY
3
DLY
7
CDLY
5
6
LGD
PGND
Q2
CDLY
9
10
LGD
PGND
Q2
Copyright ? IXYS CORPORATION 2004
LSD
6
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