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PDF LTC4449 Data sheet ( Hoja de datos )
| Número de pieza | LTC4449 | |
| Descripción | High Speed Synchronous N-Channel MOSFET Driver | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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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 Risetime Driving 3000pF Load
n 7ns TG Falltime 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 and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
LTC4449www.DataSheet4U.com
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
4449f
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current
vs Input Frequency
6
NO LOAD
VLOGIC = VCC = 5V
5 TS = GND
4
IVCC
3
2
1 IVLOGIC
0
0 200k 400k 600k 800k 1M
FREQUENCY (Hz)
4449 G12
Rise and Fall Time
vs Load Capacitance
100
VCC = 5V
TS = GND
tr(TG)
tf(TG)
10 tr(BG)
tf(BG)
1
13
10 30
LOAD CAPACITANCE (nF)
4449 G15
Switching Supply Current
vs Load Capacitance
100
VLOGIC = VCC = 5V
TS = GND
ICC
fIN = 500kHz
10
ICC
fIN = 100kHz
ILOGIC
1 fIN = 500kHz
0.1
1
3 10
LOAD CAPACITANCE (nF)
30
4449 G13
Propagation Delay
vs VLOGIC Supply Voltage
25
NO LOAD
VCC = BOOST = 5V
TS = GND
20
tpLH(TG)
tpLH(BG)
15
tpHL(TG)
10 tpHL(BG)
5
3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5
VLOGIC SUPPLY VOLTAGE (V)
4449 G16
Propagation Delay
vs Temperature
25
NO LOAD
VCC = VLOGIC = 5V
20 TS = GND
tpHL(TG)
15 tpLH(TG)
tpLH(BG)
10 tpHL(BG)
5
0
–40 –10 20 50 80
TEMPERATURE (°C)
110
4449 G18
LTC4449www.DataSheet4U.com
Rise and Fall Time
vs VCC (Boost) Supply Voltage
15
CLOAD = 3.3nF
TS = GND
10
tr(TG)
tr(BG)
5
tf(BG)
tf(TG)
0
3.5 4.0
4.5 5.0
5.5 6.0 6.5
VCC (BOOST) SUPPLY VOLTAGE (V)
4449 G14
Propagation Delay
vs VCC (Boost) Supply Voltage
20
NO LOAD
VLOGIC = 5V
TS = GND
15 tpLH(TG) tpLH(BG)
tpHL(TG)
10 tpHL(BG)
5
4.0 4.5 5.0 5.5 6.0 6.5
VCC (BOOST) SUPPLY VOLTAGE (V)
4449 G17
4449f
5
5 Page 
TYPICAL APPLICATION
LTC4449www.DataSheet4U.com
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation
that the interconnection of its circuits as described herein will not infringe on existing patent rights.
4449f
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC4449.PDF ] | |
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