LM5110
1
2
3
4
8
7
6
5
IN_REF
IN_A
IN_B
VEE
SHDN
OUT_A
OUT_B
VCC
1.0F
INA
0.1F
RG
RG
INB
0.1F
+
±
+
±
VPOS
VNEG
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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
LM5110
SNVS255B –MAY 2004–REVISED SEPTEMBER 2016
LM5110 Dual 5-A Compound Gate Driver With Negative Output Voltage Capability
1
1 Features
1• Independently Drives Two N-Channel MOSFETs
• Compound CMOS and Bipolar Outputs Reduce
Output Current Variation
• 5A sink/3A Source Current Capability
• Two Channels can be Connected in Parallel to
Double the Drive Current
• Independent Inputs (TTL Compatible)
• Fast Propagation Times (25-ns Typical)
• Fast Rise and Fall Times (14-ns/12-ns Rise/Fall
With 2-nF Load)
• Dedicated Input Ground Pin (IN_REF) for Split
Supply or Single Supply Operation
• Outputs Swing from VCC to VEE Which Can Be
Negative Relative to Input Ground
• Available in Dual Noninverting, Dual Inverting and
Combination Configurations
• Shutdown Input Provides Low Power Mode
• Supply Rail Undervoltage Lockout Protection
• Pin-Out Compatible With Industry Standard Gate
Drivers
• Packages:
– SOIC-8
– WSON-10 (4 mm × 4 mm)
2 Applications
• Synchronous Rectifier Gate Drivers
• Switch-Mode Power Supply Gate Driver
• Solenoid and Motor Drivers
3 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 VCC to the output
ground VEE which can be negative with respect to
IN_REF. Undervoltage 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 WSON-10 packages.
Device Information(1)
PART NUMBER PACKAGE BODY SIZE (NOM)
LM5110 SOIC (8) 4.90 mm × 3.91 mm
WSON (10) 4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Application Diagram
2
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Table of Contents
1 Features.................................................................. 1
2 Applications ........................................................... 1
3 Description............................................................. 1
4 Revision History..................................................... 2
5 Device Options....................................................... 3
6 Pin Configuration and Functions......................... 3
7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ...................................... 4
7.2 ESD Ratings.............................................................. 4
7.3 Recommended Operating Conditions....................... 4
7.4 Thermal Information.................................................. 4
7.5 Electrical Characteristics........................................... 5
7.6 Switching Characteristics.......................................... 5
7.7 Typical Characteristics.............................................. 7
8 Detailed Description.............................................. 9
8.1 Overview................................................................... 9
8.2 Functional Block Diagram......................................... 9
8.3 Feature Description................................................. 10
8.4 Device Functional Modes........................................ 11
9 Applications and Implementation ...................... 12
9.1 Application Information............................................ 12
9.2 Typical Application.................................................. 13
10 Power Supply Recommendations ..................... 15
11 Layout................................................................... 15
11.1 Layout Guidelines ................................................. 15
11.2 Layout Example .................................................... 16
11.3 Thermal Considerations........................................ 16
12 Device and Documentation Support................. 19
12.1 Receiving Notification of Documentation Updates 19
12.2 Community Resources.......................................... 19
12.3 Trademarks........................................................... 19
12.4 Electrostatic Discharge Caution............................ 19
12.5 Glossary................................................................ 19
13 Mechanical, Packaging, and Orderable
Information........................................................... 19
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (November 2012) to Revision B Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes,Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section ................................................................................................. 1
• Added Thermal Information table. ......................................................................................................................................... 4
OUT A
1
2
3
47
8
9
10
IN_REF
IN_A
VEE
IN_B
VCC
OUT_B
SHDN
56
NC NC
OUT A
1
2
3
4 5
6
7
8
IN_REF
IN_A
VEE
IN_B
SHDN
VCC
OUT_B
3
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5 Device Options
Table 1. Configuration Table
PART NUMBER “A” OUTPUT CONFIGURATION “B” OUTPUT CONFIGURATION PACKAGE
LM5110-1M Noninverting Noninverting SOIC- 8
LM5110-2M Inverting Inverting SOIC- 8
LM5110-3M Inverting Noninverting SOIC- 8
LM5110-1SD Noninverting Noninverting WSON-10
LM5110-2SD Inverting Inverting WSON-10
LM5110-3SD Inverting Noninverting WSON-10
6 Pin Configuration and Functions
D Package
8-Pin SOIC
Top View DPR Package
10-Pin WSON
Top Pin
(1) P = Power, G = Ground, I = Input, O = Output, I/O = Input/Output.
(2) Pins 5 and 6 are No Connect for WSON-10 packages.
Pin Functions
PIN I/O(1) DESCRIPTION APPLICATION INFORMATION
SOIC WSON(2) NAME
1 1 IN_REF G Ground reference for control
inputs
Connect to VEE for standard positive only output
voltage swing. Connect to system logic ground
reference for positive and negative output voltage
swing.
2 2 IN_A I ‘A’ side control input TTL compatible thresholds.
3 3 VEE GPower ground of the driver
outputs Connect to either power ground or a negative gate
drive supply.
4 4 IN_B I ‘B’ side control input TTL compatible thresholds.
5 7 OUT_B O Output for the ‘B’ side driver. Capable of sourcing 3A and sinking 5A. Voltage
swing of this output is from VCC to VEE.
6 8 VCC P Positive supply Locally decouple to VEE and IN_REF.
7 9 OUT_A. O Output for the ‘A’ side driver. Capable of sourcing 3A and sinking 5A. Voltage
swing of this output is from VCC to VEE .
8 10 nSHDN I Shutdown input pin Pull below 1.5V to activate low power shutdown
mode.
4
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(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
7 Specifications
7.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)(1)(2)
MIN MAX UNIT
VCC to VEE −0.3 15 V
VCC to IN_REF −0.3 15 V
IN to IN_REF, nSHDN to IN_REF −0.3 15 V
IN_REF to VEE −0.3 5 V
Maximum junction temperature,
(TJ(max)) 150 °C
Operating junction temperature 125 °C
Storage temperature, (Tstg) –55 150 °C
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
7.2 ESD Ratings VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2000 V
7.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted) MIN NOM MAX UNIT
VCC to VEE 3.5 - 14 V
VCC to IN_REF 3.5 - 14 V
IN_REF to VEE 0 4 V
Junction Temperature -40 126 °C
(1) For more information about traditional and new thermal metrics, see Semiconductor and IC Package Thermal Metrics application report.
7.4 Thermal Information
THERMAL METRIC(1) LM5110
UNITD (SOIC) DPR (WSON)
8 PINS 10 PINS
RθJA Junction-to-ambient thermal resistance 114 40.1 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 56.6 40.4 °C/W
RθJB Junction-to-board thermal resistance 55.2 17.3 °C/W
ψJT Junction-to-top characterization parameter 10.3 0.5 °C/W
ψJB Junction-to-board characterization parameter 54.6 17.5 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance - 6.3 °C/W
5
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(1) The output resistance specification applies to the MOS device only. The total output current capability is the sum of the MOS and
Bipolar devices.
7.5 Electrical Characteristics
TJ=−40°C to +125°C, VCC = 12V, VEE = IN_REF = 0V, nSHDN = VCC, No Load on OUT_A or OUT_B, unless otherwise
specified. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
VCC Operating Range VCC−IN_REF and VCC−VEE 3.5 14 V
VCCR VCC Under Voltage Lockout (rising) VCC−IN_REF 2.3 2.9 3.5 V
VCCH VCC Under Voltage Lockout
Hysteresis 230 mV
ICC VCC Supply Current (ICC)IN_A = IN_B = 0 V (5110-1) 1 2 mAIN_A = IN_B = VCC (5110-2) 1 2
IN_A = VCC, IN_B = 0 V (5110-3) 1 2
ICCSD VCC Shutdown Current (ICC) nSHDN = 0 V 18 25 µA
CONTROL INPUTS
VIH Logic High 2.2 V
VIL Logic Low 0.8 V
HYS Input Hysteresis 400 mV
IIL Input Current Low IN_A=IN_B=VCC (5110-1-2-3) −1 0.1 1
µA
IIH Input Current High
IN_A=IN_B=VCC (5110-1) 10 18 25
IN_A=IN_B=VCC (5110-2) −1 0.1 1
IN_A=VCC (5110-3) –1 0.1 1
IN_B=VCC (5110-3) 10 18 25
SHUTDOWN INPUT
ISD Pullup Current nSHDN = 0 V −18 −25 µA
VSDR Shutdown Threshold nSHDN rising 0.8 1.5 2.2 V
VSDH Shutdown Hysteresis 165 mV
OUTPUT DRIVERS
ROH Output Resistance High IOUT =−10 mA (1) 30 50 Ω
ROL Output Resistance Low IOUT = + 10 mA (1) 1.4 2.5 Ω
ISource Peak Source Current OUTA/OUTB = VCC/2,
200 ns Pulsed Current 3 A
ISink Peak Sink Current OUTA/OUTB = VCC/2,
200 ns Pulsed Current 5 A
LATCHUP PROTECTION
AEC - Q100, Method 004 TJ= 150°C 500 mA
7.6 Switching Characteristics
over operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
td1 Propagation Delay Time Low to
High, IN rising (IN to OUT) CLOAD = 2 nF, see Figure 2 25 40 ns
td2 Propagation Delay Time High to
Low, IN falling (IN to OUT) CLOAD = 2 nF, see Figure 2 25 40 ns
trRise Time CLOAD = 2 nF, see Figure 2 14 25 ns
tfFall Time CLOAD = 2 nF, see Figure 2 12 25 ns
46 8 10 12 14 16
SUPPLY VOLTAGE (V)
17.5
20
22.5
25
27.5
30
32.5
TIME (ns)
tD2
tD1
TA = 25°C
CL = 2200pF
100 1k 10k
CAPACITIVE LOAD (pF)
0
10
20
30
40
50
TIME (ns)
tr
tf
TA = 25°C
VCC = 12V
-75 -50 -25 0 25 50 75 100125150 175
10
12
14
16
18
20
TIME (ns)
TEMPERATURE (°C)
tr
tf
VCC = 12V
CL = 2200pF
46910 12 13 16
10
14
16
18
20
TIME (ns)
SUPPLY VOLTAGE (V)
12
57811 14 15
tr
tf
TA = 25°C
CL = 2200pF
110 100 1000
FREQUENCY (kHz)
0.1
1
10
100
SUPPLY CURRENT (mA)
VCC = 15V
VCC = 10V
VCC = 5V
TA = 25°C
CL = 2200pF
100
1
1k
100
10k
CAPACITIVE LOAD (pF)
0.1
10
1000
SUPPLY CURRENT (mA)
f = 500kHz
f = 100kHz
f = 10kHz
TA = 25°C
VCC = 12V
7
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7.7 Typical Characteristics
Figure 3. Supply Current vs Frequency Figure 4. Supply Current vs Load
Figure 5. Rise and Fall Time vs Supply Voltage Figure 6. Rise and Fall Time vs Temperature
Figure 7. Rise and Fall Time vs Capacitive Load Figure 8. Delay Time vs Supply Voltage
-75 -50 -25 0 25 50 75 100 125 150175
1.600
1.900
2.200
2.500
2.800
3.100
UVLO THRESHOLDS (V)
TEMPERATURE (°C)
0.150
0.210
0.270
0.330
0.450
0.390
HYSTERESIS (V)
VCCR
VCCF
VCCH
-75 -50 -25 0 25 50 75 100125150175
17.5
20
22.5
25
27.5
30
32.5
TIME (ns)
TEMPERATURE (°C)
tD2
tD1
VCC = 12V
CL = 2200pF
03 6 9 12 15 18
SUPPLY VOLTAGE (V)
0.75
1.25
1.75
2.25
2.75
3.25
ROL (:)
15
25
45
55
65
35
ROH (:)
ROH
ROL
TA = 25°C
IOUT = 10mA
8
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Typical Characteristics (continued)
Figure 9. Delay Time vs Temperature Figure 10. RDSON vs Supply Voltage
Figure 11. UVLO Thresholds and Hysteresis vs Temperature
UVLO
IN_REF
18µA
SHDN
IN_A
VCC
LEVEL
SHIFT
VCC
OUT_A
VEE
LEVEL
SHIFT
OUT_B
VEE
IN_REF
IN_B
Copyright © 2016, Texas Instruments Incorporated
9
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8 Detailed Description
8.1 Overview
LM5110 dual gate driver consists of two independent and identical driver channels with TTL compatible logic
inputs and high current totem-pole outputs that source or sink current to drive MOSFET gates. The driver output
consist of a compound structure with MOS and bipolar transistor operating in parallel to optimize current
capability over a wide output voltage and operating temperature range. The bipolar device provides high peak
current at the critical threshold region of the MOSFET VGS while the MOS devices provide rail-to-rail output
swing. The totem pole output drives the MOSFET gate between the gate drive supply voltage VCC and the power
ground potential at the VEE pin.
The LM5110 is available in dual noninverting (-1), dual inverting (-2) and the combination inverting plus
noninverting (-3) configurations. All three configurations are offered in the SOIC-8 and WSON-10 plastic
packages.
8.2 Functional Block Diagram
10
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8.3 Feature Description
8.3.1 Input Stage and Level Shifter
The control inputs of the drivers are high impedance CMOS buffers with TTL compatible threshold voltages. The
negative supply of the input buffer is connected to the input ground pin IN_REF. An internal level shifting circuit
connects the logic input buffers to the totem pole output drivers. The level shift circuit and separate input/output
ground pins provide the option of single supply or split supply configurations. When driving MOSFET gates from
a single positive supply, the IN_REF and VEE pins are both connected to the power ground. The LM5110 pinout
was designed for compatibility with industry standard gate drivers in single supply gate driver applications. Pin 1
(IN_REF) on the LM5110 is a no-connect on standard driver IC's. Connecting pin 1 to pin 3 (VEE) on the printed-
circuit board accommodates the pin-out of both the LM5110 and competitive drivers.
The input stage of each driver should be driven by a signal with a short rise and fall time. Slow rising and falling
input signals, although not harmful to the driver, may result in the output switching repeatedly at a high
frequency.
The input pins of noninverting drivers have an internal 18-μA current source pull-down to IN-REF. The input pins
of inverting driver channels have neither pullup nor pulldown current sources. Unused input should be tied to
IN_REF or VCC and not left open.
8.3.2 Output Stage
The two driver channels of the LM5110 are designed as identical cells. Transistor matching inherent to integrated
circuit manufacturing ensures that the AC and DC performance of the channels are nearly identical. Closely
matched propagation delays allow the dual driver to be operated as a single driver if inputs and output pins are
connected. The drive current capability in parallel operation is 2X the drive of either channel. Small differences in
switching speed between the driver channels will produce a transient current (shoot-through) in the output stage
when two output pins are connected to drive a single load. Differences in input thresholds between the driver
channels will also produce a transient current (shoot-through) in the output stage. Fast transition input signals are
especially important while operating in a parallel configuration. The efficiency loss for parallel operation has been
characterized at various loads, supply voltages and operating frequencies. The power dissipation in the LM5110
increases by less than 1% relative to the dual driver configuration when operated as a single driver with inputs
and outputs connected.
8.3.3 Turn-off with Negative Bias
The isolated input/output grounds provide the capability to drive the MOSFET to a negative VGS voltage for a
more robust and reliable off state. In split supply configuration, the IN_REF pin is connected to the ground of the
controller which drives the LM5110 inputs. The VEE pin is connected to a negative bias supply that can range
from the IN-REF as much as 14-V below the VCC gate drive supply.
Enhancement mode MOSFETs do not inherently require a negative bias on the gate to turn off the FET.
However, certain applications may benefit from the capability of negative VGS voltage during turnoff including:
1. When the gate voltages cannot be held safely below the threshold voltage due to transients or coupling in
the printed-circuit-board.
2. When driving low threshold MOSFETs at high junction temperatures.
3. When high switching speeds produce capacitive gate-drain current that lifts the internal gate potential of the
MOSFET.
8.3.4 UVLO and Power Supplies
An undervoltage lockout (UVLO) circuit is included in the LM5110, which senses the voltage difference between
VCC and the input ground pin, IN_REF. When the VCC to IN_REF voltage difference falls below 2.7 V, both driver
channels are disabled. The driver will resume normal operation when the VCC to IN_REF differential voltage
exceeds approximately 2.9 V. UVLO hysteresis prevents chattering during brown-out conditions.
The maximum recommended voltage difference between VCC and IN_REF or between VCC and VEE is 14 V. The
minimum voltage difference between VCC and IN_REF is 3.5 V.
11
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Feature Description (continued)
(1) IN_A and IN_B is referenced to IN_REF.
(2) OUT_A and OUT_B is referenced to VEE.
8.3.5 Shutdown SHDN
The Shutdown pin (SHDN) is a TTL compatible logic input provided to enable/disable both driver channels. When
SHDN is in the logic low state, the LM5110 is switched to a low power standby mode with total supply current
less than 25 µA. This function can be effectively used for start-up, thermal overload, or short circuit fault
protection. TI recommends connecting this pin to VCC when the shutdown function is not being used. The
shutdown pin has an internal 18-μA current source pullup to VCC.
8.4 Device Functional Modes
The device operates in normal mode and UVLO mode. See Table 2 for more information on UVLO operation
mode. In normal mode when the VCC and VIN–REF are above UVLO threshold, the output stage is dependent on
the states of the IN_A, IN_B and nSHDN pins. The output HO and LO will be low if input state is floating.
Table 2. INPUT/OUTPUT Logic Table
IN_A(1) IN_B(1) SHDN OUT_A(2) OUT_B(2)
L L H or Left Open L L
L H H or Left Open L H
H L H or Left Open H L
H H H or Left Open H H
X X L L L
12
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9 Applications and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
To operate fast switching of power MOSFETs at high switching frequencies and to reduce associated switching
losses, a powerful gate driver is employed between the PWM output of controller and the gates of the power
semiconductor devices. Also, gate drivers are indispensable when it is impossible for the PWM controller to
directly drive the gates of the switching devices. With the advent of digital power, this situation is often
encountered because the PWM signal from the digital controller is often a 3.3 V logic signal which cannot
effectively turn on a power switch. Level shift circuit is needed to boost the 3.3 V signal to the gate-drive voltage
(such as 12 V) in order to fully turn-on the power device and minimize conduction losses. Traditional buffer drive
circuits based on NPN/PNP bipolar transistors in totem-pole arrangement prove inadequate with digital power
because they lack level-shifting capability. Gate drivers effectively combine both the level-shifting and buffer-drive
functions. Gate drivers also find other needs such as minimizing the effect of high-frequency switching noise (by
placing the high-current driver IC physically close to the power switch), driving gate-drive transformers and
controlling floating power-device gates, reducing power dissipation and thermal stress in controllers by moving
gate charge power losses from the controller into the driver.
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.
LM5025
CONTROLLER
FB
OUT_A
OUT_B
-3V
IN_B
IN_A
IN_REF
IN_A
IN_B
LM5110-1
OUT_B
OUT_A
VCC
VEE
VEE
LM5110-1
OUT_A
OUT_B
VCC
VEE
VEE
IN_REF
VOUT
+10V
VIN
+5V
Single Supply
& Paralleled Inputs
and Outputs Dual Supply
utilizing negative
Output voltage
Drive
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9.2 Typical Application
Figure 12. Simplified Power Converter Using Synchronous Rectifiers
With Negative Off Gate Voltage
9.2.1 Design Requirements
To select proper device from LM5110 family, TI recommends first checking the appropriate logic for the outputs.
LM5110-2 has dual inverting outputs; LM5110-1 has dual noninverting outputs; LM5110-3 have inverting channel
A and noninverting channel B. Moreover, some design considerations must be evaluated first in order to make
the most appropriate selection. Among these considerations are VCC, drive current, and power dissipation.
9.2.2 Detailed Design Procedure
9.2.2.1 Parallel Outputs
The A and B drivers may be combined into a single driver by connecting the INA/INB inputs together as close to
the IC as possible, and the OUTA/OUTB outputs ties together if the external gate drive resistor is not used. In
some cases where the external gate drive resistor is used, TI recommends that the resistor can be equally split
in OUTA and OUTB respectively to reduce the parasitic inductance induce unbalance between two channels, as
show in Figure 13.
110 100 1000
FREQUENCY (kHz)
0.1
1
10
100
SUPPLY CURRENT (mA)
VCC = 15V
VCC = 10V
VCC = 5V
TA = 25°C
CL = 2200pF
100
1
1k
100
10k
CAPACITIVE LOAD (pF)
0.1
10
1000
SUPPLY CURRENT (mA)
f = 500kHz
f = 100kHz
f = 10kHz
TA = 25°C
VCC = 12V
LM5110
1
2
3
4
8
7
6
5
IN_REF
IN_A
IN_B
VEE
SHDN
OUT_A
OUT_B
VCC
1.0F
INA
0.1F
RG
RG
INB
0.1F
+
±
+
±
VPOS
VNEG
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Typical Application (continued)
Figure 13. Parallel Operation of LM5110-1 and LM5110-2
Important consideration about paralleling two channels for LM5110 include: 1) IN_A and IN_B should be shorted
in PCB layout as close to the device as possible, as well as for OUT_A and OUT_B, in which condition PCB
layout parasitic mismatching between two channels could be minimized. 2) INA/B input slope signal should be
fast enough to avoid mismatched VIH/VIL, td1/td2 between channel-A and channel-B. TI recommends having input
signal slope faster than 20 V/µs.
9.2.3 Application Curves
Figure 14 and Figure 15 shows the total operation current comsumption vs load and frequency.
Figure 14. Operating Current vs Switching Frequency Figure 15. Operating Current vs Load Capacitance
15
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10 Power Supply Recommendations
The recommended bias supply voltage range for LM5110 is from 3.5 V to 14 V. The upper end of this range is
driven by the 15 V absolute maximum voltage rating of the VCC. TI recommends keeping proper margin to allow
for transient voltage spikes.
A local bypass capacitor must be placed between the VCC and IN_REF pins, as well as between the VCC and
VEE. This capacitor must be placed as close to the device as possible. A low ESR, ceramic surface mount
capacitor is recommended. TI recommends using 2 capacitors in parallel: a 100-nF ceramic surface-mount
capacitor for high frequency filtering placed as close to VCC as possible, and another surface-mount capacitor,
220 nF to 10 µF, for IC bias requirements.
11 Layout
11.1 Layout Guidelines
Attention must be given to board layout when using LM5110. Some important considerations include:
1. A Low ESR/ESL capacitor must be connected close to the IC and between the VCC and VEE pins to support
high peak currents being drawn from VCC during turn-on of the MOSFET.
2. Proper grounding is crucial. The drivers need a very low impedance path for current return to ground
avoiding inductive loops. The two paths for returning current to ground are a) between LM5110 IN-REF pin
and the ground of the circuit that controls the driver inputs, b) between LM5110 VEE pin and the source of the
power MOSFET being driven. All these paths should be as short as possible to reduce inductance and be as
wide as possible to reduce resistance. All these ground paths should be kept distinctly separate to avoid
coupling between the high current output paths and the logic signals that drive the LM5110. A good method
is to dedicate one copper plane in a multi-layered PCB to provide a common ground surface.
3. With the rise and fall times in the range of 10 ns to 30 ns, care is required to minimize the lengths of current
carrying conductors to reduce their inductance and EMI from the high di/dt transients generated by the
LM5110.
4. The LM5110 SOIC footprint is compatible with other industry standard drivers. Simply connect IN_REF pin of
the LM5110 to VEE (pin 1 to pin 3) to operate the LM5110 in a standard single supply configuration.
5. If either channel is not being used, the respective input pin (IN_A or IN_B) should be connected to either
IN_REF or VCC to avoid spurious output signals. If the shutdown feature is not used, the nSHDN pin should
be connected to VCC to avoid erratic behavior that would result if system noise were coupled into a floating
’nSHDN’ pin.
VHIGH
Q2
VGATE
RG
Q1
VTRIG CIN
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11.2 Layout Example
Figure 16. SOIC(8) Layout Example
11.3 Thermal Considerations
The primary goal of thermal management is to maintain the integrated circuit (IC) junction temperature (TJ) below
a specified maximum operating temperature to ensure reliability. It is essential to estimate the maximum TJof IC
components in worst case operating conditions. The junction temperature is estimated based on the power
dissipated in the IC and the junction to ambient thermal resistance θJA for the IC package in the application board
and environment. The θJA is not a given constant for the package and depends on the printed circuit board
design and the operating environment.
11.3.1 Drive Power Requirement Calculations in LM5110
The LM5110 dual low side MOSFET driver is capable of sourcing/sinking 3-A/5-A peak currents for short
intervals to drive a MOSFET without exceeding package power dissipation limits. High peak currents are
required to switch the MOSFET gate very quickly for operation at high frequencies.
Figure 17. LM5110 drives MOSFET with Driver Output Stage and MOSFET Gate-Source Capacitance
ISINK (MAX) := TJ(MAX) - TA
TJA · RDS (ON)
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Thermal Considerations (continued)
The schematic above shows a conceptual diagram of the LM5110 output and MOSFET load. Q1 and Q2 are the
switches within the gate driver. RGis the gate resistance of the external MOSFET, and CIN is the equivalent gate
capacitance of the MOSFET. The gate resistance Rg is usually very small and losses in it can be neglected. The
equivalent gate capacitance is a difficult parameter to measure since it is the combination of CGS (gate to source
capacitance) and CGD (gate to drain capacitance). Both of these MOSFET capacitances are not constants and
vary with the gate and drain voltage. The better way of quantifying gate capacitance is the total gate charge QG
in coloumbs. QGcombines the charge required by CGS and CGD for a given gate drive voltage VGATE.
Assuming negligible gate resistance, the total power dissipated in the MOSFET driver due to gate charge is
approximated by
PDRIVER = VGATE x QG× FSW
where
• FSW = switching frequency of the MOSFET (1)
As an example, consider the MOSFET MTD6N15 whose gate charge specified as 30 nC for VGATE = 12 V.
The power dissipation in the driver due to charging and discharging of MOSFET gate capacitances at switching
frequency of 300 kHz and VGATE of 12 V is equal to
PDRIVER = 12 V × 30 nC × 300 kHz = 0.108 W. (2)
If both channels of the LM5110 are operating at equal frequency with equivalent loads, the total losses will be
twice as this value which is 0.216 W.
In addition to the above gate charge power dissipation, - transient power is dissipated in the driver during output
transitions. When either output of the LM5110 changes state, current will flow from VCC to VEE for a very brief
interval of time through the output totem-pole N and P channel MOSFETs. The final component of power
dissipation in the driver is the power associated with the quiescent bias current consumed by the driver input
stage and undervoltage lockout sections.
Characterization of the LM5110 provides accurate estimates of the transient and quiescent power dissipation
components. At 300-kHz switching frequency and 30-nC load used in the example, the transient power will be 8
mW. The 1-mA nominal quiescent current and 12-V VGATE supply produce a 12-mW typical quiescent power.
Therefore the total power dissipation
PD= 0.216 + 0.008 + 0.012 = 0.236W. (3)
We know that the junction temperature is given by
TJ= PDxθJA + TA(4)
Or the rise in temperature is given by
TRISE = TJ−TA= PDxθJA (5)
For SOIC-8 package θJA is estimated as 114°C/W see Thermal Information section.
Therefore TRISE is equal to
TRISE = 0.236 × 114 ≈27°C (6)
For WSON-10 package, the integrated circuit die is attached to leadframe die pad which is soldered directly to
the printed circuit board. This substantially decreases the junction to ambient thermal resistance (θJA). θJA as low
as 40°C/W is achievable with the WSON10 package. The resulting TRISE for the dual driver example above is
thereby reduced to just 9.5°.
11.3.2 Continuous Current Rating of LM5110
The LM5110 can deliver pulsed source/sink currents of 3 A and 5 A to capacitive loads. In applications requiring
continuous load current (resistive or inductive loads), package power dissipation, limits the LM5110 current
capability far below the 5-A sink/3-A source capability. Rated continuous current can be estimated both when
sourcing current to or sinking current from the load. For example when sinking, the maximum sink current can be
calculated using Equation 7.
ISOURCE (MAX) := TJ(MAX) - TA
TJA · VDIODE
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Thermal Considerations (continued)
where
• RDS(on) is the on resistance of lower MOSFET in the output stage of LM5110. (7)
Consider TJ(max) of 125°C and θJA of 114°C/W for an SO-8 package under the condition of natural convection
and no air flow. If the ambient temperature (TA) is 60°C, and the RDS(on) of the LM5110 output at TJ(max) is 2.5
Ω, this equation yields ISINK(max) of 478 mA which is much smaller than 5-A peak pulsed currents.
Similarly, the maximum continuous source current can be calculated as
where
• VDIODE is the voltage drop across hybrid output stage which varies over temperature and can be assumed to
be about 1.1 V at TJ(max) of 125°C (8)
Assuming the same parameters as above, this equation yields ISOURCE(max) of 518 mA.
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12 Device and Documentation Support
12.1 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
12.2 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
12.3 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
12.4 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
12.5 Glossary
SLYZ022 —TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
13 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
LM5110-1MX/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1
LM5110-1SD WSON DPR 10 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1
LM5110-1SD/NOPB WSON DPR 10 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1
LM5110-1SDX/NOPB WSON DPR 10 4500 330.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1
LM5110-2MX/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1
LM5110-2SD/NOPB WSON DPR 10 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1
LM5110-2SD/NOPB WSON DPR 10 1000 180.0 12.4 4.3 4.3 1.1 8.0 12.0 Q1
LM5110-3MX/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1
LM5110-3SD WSON DPR 10 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1
LM5110-3SD/NOPB WSON DPR 10 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1
LM5110-3SDX/NOPB WSON DPR 10 4500 330.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1
PACKAGE MATERIALS INFORMATION
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Pack Materials-Page 1