IXS839S1T-R Clare, Inc., IXS839S1T-R Datasheet

IXS839S1T-R

Manufacturer Part Number

IXS839S1T-R

Description

Synchronous Buck Mosfet Driver

Manufacturer

Clare, Inc.

Datasheet

1.IXS839S1T-R.pdf (13 pages)

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• IXS839/839B: Undervoltage Lockout

• IXS839A/B: Output Shutdown, Low Side

• 10µA Shut Down Current

• 2mA Quiescent Current (Non- Switching)

• Bootstrapped High Side Driver

• Cross-Conduction Protection

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

Applications:

• Multiphase Desktop CPU Supplies

• Mobile CPU Core Voltage supplies

• High Current / Low Voltage DC/DC

Figure 1. IXS839 Functional Block Diagram

PWM

DLY

CDLY

Shutdown Inputs

24V

Synchronous Buck Converters

IXYS

PROTECTION

OVERLAP

CIRCUIT

and General Application Circuit

UVLO

Synchronous Buck MOSFET Driver

IXS839 / IXS839A / IXS839B

VDD

PGND

HGD

BST

LGD

CBST

DBST

VIN

VOUT

General Description

Figure 2. IXS839A Functional Block Diagram

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

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.

PWM

DLY

LSD

CDLY

IXS839

PROTECTION

and General Application Circuit

OVERLAP

CIRCUIT

and

IXS839B

VDD

HGD

PGND

LGD

BST

incorporate

CBST

DBST

VIN

9/9/2005

VOUT

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