National Semiconductor LM5110 Technical data

October 2003

LM5110
Dual 5A Compound Gate Driver with Negative Output
Voltage Capability

General Description

The LM5110 Dual Gate Driver replaces industry standard
gate drivers with improved peak output current and effi­ciency. Each “compound” output driver stage includes MOS
and bipolar transistors operating in parallel that together sink
more than 5A peak from capacitive loads. Combining the
unique characteristics of MOS and bipolar devices reduces
drive current variation with voltage and temperature. Sepa­rate input and output ground pins provide Negative Drive
Capability allowing the user to drive MOSFET gates with
positive and negative VGS voltages. The gate driver control
inputs are referenced to a dedicated input ground (IN_REF).
The gate driver outputs swing from V

which can be negative with respect to IN_REF. The

V

EE

ability to hold MOSFET gates off with a negative VGS volt­age reduces losses when driving low threshold voltage
MOSFETs often used as synchronous rectifiers. When driv­ing with conventional positive only gate voltage, the IN_REF
and V
common ground. Under-voltage lockout protection and a
shutdown input pin are also provided. The drivers can be
operated in parallel with inputs and outputs connected to
double the drive current capability. This device is available in
the SOIC-8 and the thermally-enhanced LLP-10 packages.

pins are connected together and referenced to a

EE

to the output ground

CC

Features

n Independently drives two N-Channel MOSFETs
n Compound CMOS and bipolar outputs reduce output

current variation

n 5A sink/3A source current capability
n Two channels can be connected in parallel to double the

drive current

n Independent inputs (TTL compatible)
n Fast propagation times (25 ns typical)
n Fast rise and fall times (14 ns/12 ns rise/fall with 2 nF

load)

n Dedicated input ground pin (IN_REF) for split supply or

single supply operation

n Outputs swing from V

relative to input ground

n Available in dual non-inverting, dual inverting and

combination configurations

n Shutdown input provides low power mode
n Supply rail under-voltage lockout protection
n Pin-out compatible with industry standard gate drivers

to VEEwhich can be negative

CC

Typical Applications

n Synchronous Rectifier Gate Drivers
n Switch-mode Power Supply Gate Driver
n Solenoid and Motor Drivers
n Power Level Shifter

Package

n SOIC-8
n LLP-10 (4 mmx4mm)

LM5110 Dual 5A Compound Gate Driver with Negative Output Voltage Capability

Ordering Information

Order Number Package Type NSC Package Drawing Supplied As

LM5110-1/2/3 M SOIC-8 M08A Shipped in anti-static units

LM5110-1/2/3 MX SOIC-8 M08A 2500 shipped in Tape & Reel

LM5110-1/2/3 SD LLP-10 SDC10A 1000 shipped in Tape & Reel

LM5110-1/2/3 SDX LLP-10 SDC10A 4500 shipped in Tape & Reel

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Pin Configurations

LM5110

Block Diagram

SOIC-8

20079201

LLP-10

20079202

NC - NOT CONNECTED

Block Diagram of LM5110

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20079203

Typical Application

LM5110

Simplified Power Converter Using Synchronous Rectifiers

with Negative Off Gate Voltage

20079204

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Pin Description

LM5110

SOIC-8 LLP-10

Note: Pins 5 and 6 are No Connect for LLP-10 package.

Pin

Description

Name Description Application Information

1 1 IN_REF Ground reference for control

2 2 IN_A ‘A’ side control input TTL compatible thresholds.

33V

EE

4 4 IN_B ‘B’ side control input TTL compatible thresholds.

5 7 OUT_B Output for the ‘B’ side driver. Capable of sourcing 3A and sinking 5A. Voltage

68V

CC

7 9 OUT_A. Output for the ‘A’ side driver. Capable of sourcing 3A and sinking 5A. Voltage

8 10 nSHDN Shutdown input pin Pull below 1.5V to activate low power shutdown

Configuration Table

inputs

Connect to V
voltage swing. Connect to system logic ground

for standard positive only output

EE

reference for positive and negative output voltage
swing.

Power ground of the driver
outputs

Connect to either power ground or a negative gate
drive supply.

swing of this output is from V

CC

to VEE.

Positive supply Locally decouple to VEEand IN_REF.

swing of this output is from VCCto VEE.

mode.

Part Number “A” Output Configuration “B” Output Configuration Package

LM5110-1M Non-Inverting Non-Inverting SOIC- 8

LM5110-2M Inverting Inverting SOIC- 8

LM5110-3M Inverting Non-Inverting SOIC- 8

LM5110-1SD Non-Inverting Non-Inverting LLP-10

LM5110-2SD Inverting Inverting LLP-10

LM5110-3SD Inverting Non-Inverting LLP-10

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