LM27224A [TI]
LM2724A High Speed 3A Synchronous MOSFET Driver;
| 型号： | LM27224A |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | LM2724A High Speed 3A Synchronous MOSFET Driver |
| 文件： | 总11页 (文件大小：696K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
NRND
LM2724A
www.ti.com
SNVS242C –JUNE 2003–REVISED MARCH 2013
LM2724A High Speed 3A Synchronous MOSFET Driver
Check for Samples: LM2724A
1
FEATURES
DESCRIPTION
The LM2724A is a dual N-channel MOSFET driver
2
•
•
•
•
•
•
Shoot-Through Protection
which can drive both the top and bottom MOSFETs in
a push-pull structure simultaneously. The LM2724A
takes a logic input and splits it into two complimentary
signals with a typical 20ns dead time in between. The
built-in cross-conduction protection circuitry prevents
the top and bottom MOSFETs from turning on
simultaneously. With a bias voltage of 5V, the peak
sourcing and sinking current for each driver of the
LM2724A is about 3A. Input UVLO (Under-Voltage-
Lock-Out) ensures that all the driver outputs stay low
until the supply rail exceeds the power-on threshold
during system power on, or after the supply rail drops
below power-on threshold by a specified hysteresis
during system power down. The cross-conduction
protection circuitry detects both driver outputs and will
not turn on a driver until the other driver output is low.
The top gate voltage needed by the top MOSFET is
obtained through an external boot-strap structure.
When not switching, the LM2724A only draws up to
195µA from the 5V rail. The synchronization
operation of the bottom MOSFET can be disabled by
pulling the SYNC pin to ground.
Input Under-Voltage-Lock-Out
3A Peak Driving Current
195µA Quiescent Current
28V Input Voltage in Buck Configuration
SOIC-8 and WSON Packages
APPLICATIONS
•
•
•
•
High Current DC/DC Power Supplies
High Input Voltage Switching Regulators
Fast Transient Microprocessors
Notebook Computers
TYPICAL APPLICATION
VIN (up to 28V)
D1
C2
+
1.5
+5V
C3
Q1
.33mF
U1
C1
6
5
4
8
3
2
1
7
1mF
BOOT
VCC
L1
VOUT
(to controller)
(to controller)
HG
SW
LG
SYNC
IN
Q2
+
GND
C4
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2003–2013, Texas Instruments Incorporated
NRND
LM2724A
SNVS242C –JUNE 2003–REVISED MARCH 2013
www.ti.com
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.
CONNECTION DIAGRAM
1
8
7
6
5
GND
LG
SW
1
8
GND
LG
SW
HG
2
3
4
HG
2
7
BOOT
VCC
BOOT
IN
6
5
VCC
SYNC
3
4
SYNC
IN
Figure 1. 8-Lead SOIC
See Package Number D
Figure 2. 8-Lead WSON
See Package Number NGN
PIN DESCRIPTIONS
Pin
1
Name
Function
SW
HG
Top driver return. Should be connected to the common node of top and bottom FETs
Top gate drive output. Should be connected to the top FET gate.
Bootstrap. Accepts a bootstrap voltage for powering the high-side driver
Accepts a logic control signal
2
3
BOOT
IN
4
5
SYNC
VCC
Bottom gate enable
6
Connect to +5V supply
7
LG
Bottom gate drive output. Should be connected to the bottom FET gate.
Ground
8
GND
BLOCK DIAGRAM
+5V
VIN
BOOT
HG
SW
VCC
Q1
Power
On
Reset
VOUT
+
-
SYNC
IN
Q2
Logic
LG
Shoot-through
Protection
GND
2
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Copyright © 2003–2013, Texas Instruments Incorporated
Product Folder Links: LM2724A
NRND
LM2724A
www.ti.com
SNVS242C –JUNE 2003–REVISED MARCH 2013
ABSOLUTE MAXIMUM RATINGS(1)(2)
VALUE / UNITS
VCC
7V
7V
BOOT to SW
BOOT to GND(3)
SW to GND(4)
Junction Temperature
35V
-2V to 30V
+150°C
720mW (SOIC-8)
3.2W (WSON-8)
Power Dissipation(5)
Storage Temperature
ESD Susceptibility
−65°C to 150°C
2.0 kV
Human Body Model(6)
Soldering Time, Temperature
10sec., 300°C
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating ratings are conditions under which
the device operates correctly. The ensured specifications apply only for the listed test conditions. Some performance characteristics may
degrade when the part is not operated under listed conditions.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(3) If BOOT voltage exceeds this value, the ESD structure will degrade.
(4) The SW pin can have -2V to -0.5V applied for a maximum duty cycle of 10% with a maximum period of 1 second. There is no duty cycle
or maximum period limitation for a SW pin voltage range of -0.5V to 30V.
(5) Maximum allowable power dissipation is a function of the maximum junction temperature, TJMAX, the junction-to-ambient thermal
resistance, θJA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated
using: PMAX = (TJMAX-TA) / θJA. The junction-to-ambient thermal resistance, θJA, for LM2724A is 172°C/W. For a TJMAX of 150°C and TA
of 25°C, the maximum allowable power dissipation is 0.7W. The θJA, for LM2724A WSON package is 39°C/W. For a TJMAX of 150°C
and TA of 25°C, the maximum allowable power dissipation is 3.2W.
(6) ESD machine model susceptibility is 200V.
RECOMMENDED OPERATING CONDITIONS(1)
VALUE / UNITS
VCC
4.3V to 6.8V
Junction Temperature Range
-40°C to 125°C
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating ratings are conditions under which
the device operates correctly. The ensured specifications apply only for the listed test conditions. Some performance characteristics may
degrade when the part is not operated under listed conditions.
Copyright © 2003–2013, Texas Instruments Incorporated
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3
Product Folder Links: LM2724A
NRND
LM2724A
SNVS242C –JUNE 2003–REVISED MARCH 2013
www.ti.com
Electrical Characteristics — LM2724A
VCC = BOOT = SYNC = 5V, SW = GND = 0V, unless otherwise specified. Tyicals and limits appearing in plain type apply for
TA = TJ = +25°C. Limits appearing in boldface type apply over the entire operating temperature range.
Symbol
Parameter
Condition
Min
Typ
Max
195
Units
POWER SUPPLY
Iq_op
TOP DRIVER
Peak Pull-Up Current
Operating Quiescent Current
IN = 0V
145
µA
3.0
1.2
−3.2
0.5
17
A
Ω
Pull-Up Rds_on
Peak Pull-down Current
Pull-down Rds_on
Rise Time
IBOOT = IHG = 0.3A
A
ISW = IHG = 0.3A
Ω
t4
t6
t3
t5
Timing Diagram, CLOAD = 3.3nF
ns
ns
ns
ns
Fall Time
12
Pull-Up Dead Time
Pull-Down Delay
Timing Diagram
19
Timing Diagram, from IN Falling Edge
27
BOTTOM DRIVER
Peak Pull-Up Current
3.2
1.1
3.2
0.6
17
A
Ω
Pull-up Rds_on
Peak Pull-down Current
Pull-down Rds_on
Rise Time
IVCC = ILG = 0.3A
A
IGND = ILG = 0.3A
Ω
t8
Timing Diagram, CLOAD = 3.3nF
ns
ns
ns
ns
t2
Fall Time
14
t7
Pull-up Dead Time
Pull-down Delay
Timing Diagram
Timing Diagram
22
t1
13
LOGIC
Vuvlo_up
Vuvlo_dn
VCC Under-Voltage-Lock-Out Upper Threshold
VCC Under-Voltage-Lock-Out Lower Threshold
VCC rises from 0V toward 5V
VCC falls from 5V toward 0V
VCC falls from 5V toward 0V
4
V
V
V
2.5
Vuvlo_hys VCC Under-Voltage-Lock-Out Hysteresis
VIH_SYNC SYNC Pin High Input
0.8
55%
VCC
µA
VIL_SYNC SYNC Pin Low Input
25%
2
Ileak_SYNC SYNC Pin Leakage Current
SYNC = 5V, Sink Current
SYNC = 0V, Source Current
IN = 0V, Source Current
IN = 5V, Sink Current
10
2
Ileak_IN
IN Pin Leakage Current
µA
10
ton_min1
ton_min2
Minimum Positive Pulse Width at IN Pin(1)
160
45
Minimum Positive Pulse Width at IN Pin for HG to
Respond(2)
ton_min3
toff_min1
toff_min2
Minimum Positive Pulse Width at IN Pin for LG to
Respond(3)
10
40
5
ns
Minimum Negative Pulse Width at IN Pin for LG
to Respond(4)
Minimum Negative Pulse Width at IN Pin for HG
to Respond(5)
VIH_IN
VIL_IN
IN High Level Input Voltage
IN Low Level Input Voltage
When IN pin goes high from 0V
When IN pin goes low from 5V
55%
VCC
25%
(1) If the positive pulse width at IN pin is below this value but above ton_min2, the pulse is internally stretched to ton_min1, so the HG width will
be a constant value.
(2) If the positive pulse width at IN pin is below this value but above ton_min3, then HG stops responding while LG still responds to the pulse.
(3) If the positive pulse width at IN pin is below this value, the pulse will be completely ignored. Neither HG or LG will respond to it.
(4) If the negative pulse width at IN pin is below this value but above toff_min2, then LG stops responding while HG still responds.
(5) If the negative pulse width at IN pin is below this value, the pulse will be completely ignored. Neither HG or LG will respond to it.
4
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Copyright © 2003–2013, Texas Instruments Incorporated
Product Folder Links: LM2724A
NRND
LM2724A
www.ti.com
SNVS242C –JUNE 2003–REVISED MARCH 2013
TIMING DIAGRAM
IN
t2
t7
t8
t5
t1
LG
t3
t4
t6
HG
Copyright © 2003–2013, Texas Instruments Incorporated
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Product Folder Links: LM2724A
NRND
LM2724A
SNVS242C –JUNE 2003–REVISED MARCH 2013
www.ti.com
REVISION HISTORY
Changes from Revision B (March 2013) to Revision C
Page
•
Changed layout of National Data Sheet to TI format ............................................................................................................ 5
6
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Copyright © 2003–2013, Texas Instruments Incorporated
Product Folder Links: LM2724A
PACKAGE OPTION ADDENDUM
www.ti.com
28-Mar-2013
PACKAGING INFORMATION
Orderable Device
LM2724AMX
Status Package Type Package Pins Package
Eco Plan Lead/Ball Finish
MSL Peak Temp
Op Temp (°C)
Top-Side Markings
Samples
Drawing
Qty
(1)
(2)
(3)
(4)
NRND
SOIC
SOIC
D
8
8
2500
TBD
Call TI
CU SN
Call TI
2724
AM
LM2724AMX/NOPB
NRND
D
2500
Green (RoHS
& no Sb/Br)
Level-1-260C-UNLIM
2724
AM
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
Multiple Top-Side Markings will be inside parentheses. Only one Top-Side Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a
continuation of the previous line and the two combined represent the entire Top-Side Marking for that device.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
8-Apr-2013
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
B0
K0
P1
W
Pin1
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
LM2724AMX
SOIC
SOIC
D
D
8
8
2500
2500
330.0
330.0
12.4
12.4
6.5
6.5
5.4
5.4
2.0
2.0
8.0
8.0
12.0
12.0
Q1
Q1
LM2724AMX/NOPB
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
8-Apr-2013
*All dimensions are nominal
Device
Package Type Package Drawing Pins
SPQ
Length (mm) Width (mm) Height (mm)
LM2724AMX
SOIC
SOIC
D
D
8
8
2500
2500
367.0
367.0
367.0
367.0
35.0
35.0
LM2724AMX/NOPB
Pack Materials-Page 2
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