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Si9976
Vishay Siliconix
N-Channel Half-Bridge Driver
FEATURES
APPLICATIONS
D
D
D
D
D
D
D
Single Input for High-Side and Low-Side MOSFETs
20- to 40-V Supply
Static (dc) Operation
Cross-Conduction Protected
Undervoltage Lockout
ESD and Short Circuit Protected
Fault Feedback
D
D
D
D
D
D
D
Power Supplies
Motor Drives
Office Automation
Computer Peripherals
Industrial Controllers
Robotics
Medical Equipment
DESCRIPTION
The Si9976 is an integrated driver for an n-channel MOSFET
half-bridge. Schmitt trigger inputs provide logic signal
compatibility and hysteresis for increased noise immunity. An
internal low-voltage regulator allows the device to be powered
directly from a system supply of 20 to 40 volts. Both half-bridge
n-channel gates are driven directly with low-impedance
outputs. Addition of one external capacitor allows an internal
circuit to level shift both the power supply and logic signal for
the half-bridge high-side n-channel gate drive. An internal
charge pump replaces leakage current lost in the high-side
driver circuit to provide “static” (dc) operation in any output
condition. Protection features include an undervoltage
lockout, cross-conduction prevention logic, and a short circuit
monitor.
The Si9976 is available in both standard and lead (Pb)-free,
14-pin SOIC (surface mount) packages, specified to operate
over the industrial ( ? 40 to 85 _ C) temperature range.
FUNCTIONAL BLOCK DIAGRAM
V+
V+ 3
Bootstrap
Regulator
2
CAP
V DD
4
Low Voltage
Regulator
Under Voltage
Lockout 2
Charge
Pump
V DD
Under Voltage
Lockout 1
12
G 1
C Boot
V CC
7
13
S 1
8
FAULT
IN 5
Short Circuit
& UVL Detect
250 ns
Delay
Half-
Bridge
Output
0.01 m F
EN 6
10
Substrate
R
S Q
Enable Latch
300 ns
Delay
9
G 2
GND
GND
Document Number: 70016
S-40757—Rev. F, 19-Apr-04
www.vishay.com
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