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Linear Technology Electronic Components Datasheet

LTC4449IDCB Datasheet

High Speed Synchronous N-Channel MOSFET

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FEATURES
n 4V to 6.5V VCC Operating Voltage
n 38V Maximum Input Supply Voltage
n Adaptive Shoot-Through Protection
n Rail-to-Rail Output Drivers
n 3.2A Peak Pull-Up Current
n 4.5A Peak Pull-Down Current
n 8ns TG Rise Time Driving 3000pF Load
n 7ns TG Fall Time Driving 3000pF Load
n Separate Supply to Match PWM Controller
n Drives Dual N-Channel MOSFETs
n Undervoltage Lockout
n Low Profile (0.75mm) 2mm × 3mm DFN Package
APPLICATIONS
n Distributed Power Architectures
n High Density Power Modules
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
LTC4449
High Speed Synchronous
N-Channel MOSFET Driver
DESCRIPTION
The LTC®4449 is a high frequency gate driver that
is designed to drive two N-Channel MOSFETs in a
synchronous DC/DC converter. The powerful rail-to-rail
driver capability reduces switching losses in MOSFETs
with high gate capacitance.
The LTC4449 features a separate supply for the input logic
to match the signal swing of the controller IC. If the input
signal is not being driven, the LTC4449 activates a shutdown
mode that turns off both external MOSFETs. The input logic
signal is internally level-shifted to the bootstrapped supply,
which functions at up to 42V above ground.
The LTC4449 contains undervoltage lockout circuits on
both the driver and logic supplies that turn off the external
MOSFETs when an undervoltage condition is present. An
adaptive shoot-through protection feature is also built-in
to prevent the power loss resulting from MOSFET cross-
conduction current.
The LTC4449 is available in the 2mm × 3mm DFN
package.
TYPICAL APPLICATION
Synchronous Buck Converter Driver
VCC
4V TO 6.5V
VCC
VLOGIC
BOOST
LTC4449 TG
VIN
TO 38V
PWM
TS
IN
BG
GND
VOUT
4449 TA01a
LTC4449 Driving 3000pF Capacitive Loads
INPUT (IN)
5V/DIV
TOP GATE
(TG - TS)
5V/DIV
BOTTOM GATE
(BG) 5V/DIV
10ns/DIV
4449 TA01b
4449fa
1


Linear Technology Electronic Components Datasheet

LTC4449IDCB Datasheet

High Speed Synchronous N-Channel MOSFET

No Preview Available !

LTC4449
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage
VLOGIC...................................................... –0.3V to 7V
VCC........................................................... –0.3V to 7V
BOOST – TS............................................. –0.3V to 7V
BOOST Voltage .......................................... –0.3V to 42V
TS ................................................................. –5V to 38V
IN Voltage .................................................... –0.3V to 7V
Driver Output TG (with Respect to TS)......... –0.3V to 7V
Driver Output BG.......................................... –0.3V to 7V
Operating Junction Temperature Range
(Notes 2, 3)............................................–40°C to 125°C
Storage Temperature Range...................–65°C to 150°C
PIN CONFIGURATION
TOP VIEW
TG 1
8 BOOST
TS 2
9
7 VCC
BG 3
6 VLOGIC
GND 4
5 IN
DCB PACKAGE
8-LEAD (2mm s 3mm) PLASTIC DFN
θJA = 64°C/W, θJC = 10.6°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4449EDCB#PBF
LTC4449EDCB#TRPBF LFKC
8-Lead (2mm × 3mm) Plastic DFN
–40°C to 125°C
LTC4449IDCB#PBF
LTC4449IDCB#TRPBF LFKC
8-Lead (2mm × 3mm) Plastic DFN
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *Temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for information on lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating junction
temperature range, otherwise specifications are at TA = 25°C. VCC = VLOGIC = VBOOST = 5V, VTS = GND = 0V, unless otherwise noted. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Logic Supply (VLOGIC)
VLOGIC
IVLOGIC
UVLO
Operating Range
DC Supply Current
Undervoltage Lockout Threshold
IN = Floating
VLOGIC Rising
VLOGIC Falling
Hysteresis
3
6.5
V
730
900
μA
l 2.5
2.75
3
V
l 2.4
2.65
2.9
V
100
mV
Gate Driver Supply (VCC)
VCC
Operating Range
IVCC
DC Supply Current
UVLO
Undervoltage Lockout Threshold
IN = Floating
VCC Rising
VCC Falling
Hysteresis
4
6.5
V
300
400
μA
l 2.75 3.20 3.65
V
l 2.60 3.04 3.50
V
160
mV
IBOOST
DC Supply Current
IN = Floating
300
400
μA
4449fa
2


Part Number LTC4449IDCB
Description High Speed Synchronous N-Channel MOSFET
Maker Linear
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