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LTC4449IDCB#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P14
LTC4449
4
4449fa
TYPICAL PERFORMANCE CHARACTERISTICS
Input Thresholds
vs V
LOGIC
Supply Voltage
Input Thresholds for V
LOGIC
= 3.3V
vs Temperature
BG or TG Input Threshold Hysteresis
vs V
LOGIC
Supply Voltage
V
LOGIC
Undervoltage Lockout
Thresholds vs Temperature
Undervoltage Lockout Threshold
Hysteresis vs Temperature
Input Thresholds for V
LOGIC
≥ 5V
vs Temperature
Quiescent Supply Current
vs Supply Voltage
V
CC
Undervoltage Lockout
Thresholds vs Temperature
BG or TG Input Threshold Hysteresis
vs Temperature
V
LOGIC
SUPPLY (V)
3.0 3.5
0
INPUT THRESHOLD (V)
1.0
4.0
4.0
5.0
5.5
4449 G01
0.5
2.0
2.5
3.0
3.5
1.5
4.5
6.0
6.5
V
IH(TG)
V
IL(TG)
V
IL(BG)
V
IH(BG)
TEMPERATURE (°C)
INPUT THRESHOLD (V)
1.0
2.0
3.0
0.5
1.5
2.5
–10 20 50 80
4449 G02
110–40
V
IH(TG)
V
LOGIC
= 3.3V
V
IL(TG)
V
IL(BG)
V
IH(BG)
TEMPERATURE (°C)
INPUT THRESHOLD (V)
3
4
5
4449 G03
2
1
0
–10–40 110
20
50
80
V
IH(TG)
V
LOGIC
≥ 5V
V
IL(TG)
V
IL(BG)
V
IH(BG)
V
LOGIC
SUPPLY (V)
3.0 3.5
0
BG OR TG INPUT THRESHOLD HYSTERESIS (V)
0.10
0.35
4.0
5.0
5.5
4449 G04
0.05
0.20
0.25
0.30
0.15
4.5
6.0
6.5
TEMPERATURE (°C)
BG OR TG INPUT THRESHOLD HYSTERESIS (V)
0.25
0.30
0.35
4449 G05
0.15
0
–40 –10 20 50 80
110
0.40
0.20
0.10
0.05
V
LOGIC
= 5V
V
LOGIC
= 3.3V
SUPPLY VOLTAGE (V)
3.0
0
SUPPLY CURRENT (mA)
0.1
0.3
0.4
0.5
1.0
0.7
4.0
5.0
5.5
4449 G06
0.2
0.8
0.9
0.6
3.5
4.5
6.0
6.5 7.0
IN FLOATING
TS = GND
I
VLOGIC
I
BOOST
I
VCC
TEMPERATURE (°C)
V
LOGIC
UVLO THRESHOLD (V)
2.8
2.9
4449 G08
2.7
2.6
2.5
–10–40 110
20
50
80
RISING THRESHOLD
FALLING THRESHOLD
TEMPERATURE (°C)
V
CC
UVLO THRESHOLD (V)
3.2
3.3
4449 G09a
3.1
3.0
2.9
–10–40 110
20
50
80
RISING THRESHOLD
FALLING THRESHOLD
TEMPERATURE (°C)
UVLO THRESHOLD HYSTERESIS (V)
150
250
200
4449 G09b
100
50
0
–10–40 110
20
50
80
V
CC
UVLO
V
LOGIC
UVLO
LTC4449
5
4449fa
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current
vs Input Frequency
Propagation Delay
vs V
LOGIC
Supply Voltage
Propagation Delay
vs V
CC
(Boost) Supply Voltage
Rise and Fall Time
vs V
CC
(Boost) Supply Voltage
Switching Supply Current
vs Load Capacitance
Rise and Fall Time
vs Load Capacitance
Propagation Delay
vs Temperature
FREQUENCY (Hz)
0
5
6
800k
4449 G12
4
3
200k 400k 600k 1M
2
1
0
SUPPLY CURRENT (mA)
NO LOAD
V
LOGIC
= V
CC
= 5V
TS = GND
I
VCC
I
VLOGIC
LOAD CAPACITANCE (nF)
0.1
SUPPLY CURRENT (mA)
1
10
100
4449 G13
31030
V
LOGIC
= V
CC
= 5V
TS = GND
I
CC
f
IN
= 500kHz
I
CC
f
IN
= 100kHz
I
LOGIC
f
IN
= 500kHz
1
V
CC
(BOOST) SUPPLY VOLTAGE (V)
3.5
15
10
5
0
5.0 6.0
4449 G14
4.0 4.5
5.5 6.5
RISE/FALL TIME (ns)
C
LOAD
= 3.3nF
TS = GND
t
r(TG)
t
r(BG)
t
f(TG)
t
f(BG)
LOAD CAPACITANCE (nF)
3
1
RISE/FALL TIME (ns)
10
100
10 30
4449 G15
V
CC
= 5V
TS = GND
t
r(BG)
t
r(TG)
t
f(TG)
1
t
f(BG)
V
LOGIC
SUPPLY VOLTAGE (V)
3.53.0
25
15
20
10
5
5.0 6.0
4449 G16
4.0 4.5
5.5 6.5
PROPAGATION DLEAY (ns)
NO LOAD
V
CC
= BOOST = 5V
TS = GND
t
pHL(TG)
t
pLH(BG)
t
pLH(TG)
t
pHL(BG)
V
CC
(BOOST) SUPPLY VOLTAGE (V)
20
15
10
5
5.0 6.0
4449 G17
4.0 4.5
5.5 6.5
PROPAGATION DLEAY (ns)
NO LOAD
V
LOGIC
= 5V
TS = GND
t
pHL(TG)
t
pLH(BG)
t
pLH(TG)
t
pHL(BG)
TEMPERATURE (°C)
PROPAGATION DELAY (ns)
4449 G18
15
0
–40 –10 20 50 80
110
25
20
10
5
NO LOAD
V
CC
= V
LOGIC
= 5V
TS = GND
t
pHL(TG)
t
pLH(BG)
t
pLH(TG)
t
pHL(BG)
LTC4449
6
4449fa
BLOCK DIAGRAM
PIN FUNCTIONS
TG (Pin 1): High Side Gate Driver Output (Top Gate). This
pin swings between TS and BOOST.
TS (Pin 2): High Side MOSFET Source Connection (Top
Source).
BG (Pin 3): Low Side Gate Driver Output (Bottom Gate).
This pin swings between V
CC
and GND.
GND (Pin 4, Exposed Pad Pin 9): Chip Ground. The
exposed pad must be soldered to PCB ground for optimal
electrical and thermal performance.
IN (Pin 5): Input Signal. Input referenced to an internal
supply baised off of V
LOGIC
(Pin 6) and GND. If this pin is
fl oating, an internal resistive divider triggers a shutdown
mode in which both BG (Pin 3) and TG (Pin 1) are pulled
low. Trace capacitance on this pin should be minimized
to keep the shutdown time low.
V
LOGIC
(Pin 6): Logic Supply. This pin powers the input
buffer and logic. Connect this pin to the power supply
of the controller that is driving IN (Pin 5) to match input
thresholds or to V
CC
(Pin 7) to simplify PCB routing.
V
CC
(Pin 7): Output Driver Supply. This pin powers the
low side gate driver output directly and the high side gate
driver output through an external Schottky diode connected
between this pin and BOOST. A low ESR ceramic bypass
capacitor should be tied between this pin and GND.
BOOST (Pin 8): High Side Bootstrapped Supply. An
external capacitor should be tied between this pin and TS
(Pin 2). Normally an external Schottky diode is connected
between V
CC
(Pin 7) and this pin. Voltage swing at this
pin is from V
CC
– V
D
to V
IN
+ V
CC
– V
D
, where V
D
is the
forward voltage drop of the Schottky diode.
8
1
2
SHOOT-
THROUGH
PROTECTION
THREE-STATE
INPUT
BUFFER
LEVEL
SHIFTER
INTERNAL
SUPPLY
UNDERVOLTAGE
LOCKOUT
UNDERVOLTAGE
LOCKOUT
BOOST
TG
TS
3
6
BG
4449 BD
V
CC
7k
7k
V
LOGIC
7
V
CC
5
IN
4
GND
9
GND
P1-P3P4-P6P7-P9P10-P12P13-P14

LTC4449IDCB#TRMPBF

Mfr. #:
Buy LTC4449IDCB#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Gate Drivers Hi Speed Sync N-Ch MOSFET Drvr
Lifecycle:
New from this manufacturer.
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