LTC1693
High Speed Single/Dual
N-Channel MOSFET Drivers
U
FEATURES
DESCRIPTIO
The LTC®1693 family drives power N-channel MOSFETs
at high speed. The 1.5A peak output current reduces
switching losses in MOSFETs with high gate capacitance.
■
Dual MOSFET Drivers in SO-8 Package
or Single MOSFET Driver in MSOP Package
■
1GΩ Electrical Isolation Between the Dual Drivers
Permits High/Low Side Gate Drive
The LTC1693-1 contains two noninverting drivers while
the LTC1693-2 contains one noninverting and one invert-
ing driver. These dual drivers are electrically isolated and
independent. The LTC1693-3 is a single driver with an
output polarity select pin.
■
1.5A Peak Output Current
■
16ns Rise/Fall Times at VCC = 12V, CL = 1nF
■
Wide VCC Range: 4.5V to 13.2V
■
CMOS Compatible Inputs with Hysteresis,
Input Thresholds are Independent of VCC
■
■
■
All MOSFET drivers offer VCC independent CMOS input
thresholds with 1.2V of typical hysteresis. They can level-
shifttheinputlogicsignalupordowntotherail-to-railVCC
drive for the external MOSFET.
Driver Input Can Be Driven Above VCC
Undervoltage Lockout
Thermal Shutdown
U
APPLICATIO S
TheLTC1693containsanundervoltagelockoutcircuitand
a thermal shutdown circuit that disable the external
N-channel MOSFET gate drive when activated.
■
Power Supplies
■
High/Low Side Drivers
■
Motor/Relay Control
Line Drivers
Charge Pumps
TheLTC1693-1andLTC1693-2comeinan8-leadSOpack-
age. The LTC1693-3 comes in an 8-lead MSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
■
U
TYPICAL APPLICATION
Two Transistor Forward Converter
V
IN
48VDC
C1
330µF
63V
C2
1.5µF
63V
+
±10%
R1
0.068Ω
D1
RETURN
MURS120
L1
1.5µH
Q1
T1
13:2
MTD20NO6HD
V
12V
OUT
1.5V/15A
C5
C3
4700pF
25V
R2
5.1Ω
D2
MURS120
•
•
C4
LTC1693CS8-2
1µF
1
2
3
4
8
7
6
5
0.1µF
IN1
GND1 OUT1
IN2
GND2 OUT2
C7
V
CC1
R3
17
IN
249Ω
D3
C6
C11
0.1µF
12V
+
1%
MURS120
470µF
20
V
CC2
BOOST
6.3V
Q2
Si4420
×2
R4
C9
19
×8
Q4
Si4420
1.24k
1%
LT1339
TG
1800pF
5%
1
2
C8
1µF
SYNC
5V
Q3
BAT54
1µF
NPO
18
11
12
16
14
13
9
MTD20NO6HD
TS
+
REF
R5
2.49k
1%
R6 100Ω
4
RETURN
SL/ADJ
SENSE
R7 100Ω
D4
3
–
C
T
SENSE
MBRO530T1
LTC1693CS8-2
1
2
3
4
8
5
IN1
GND1 OUT1
IN2
GND2 OUT2
V
CC1
I
BG
PHASE
AVG
R8
301k
1%
7
6
5
6
SS
7
V
CC2
V
C
RUN/SHDN
10
V
V
FB
C10
REF
SGND PGND
15
C12
100pF
R9
12k
0.1µF
R10
10k
1%
C13
1µF
C1: SANYO 63MV330GX
C2: WIMA SMD4036/1.5/63/20/TR
C6: KEMET T510X477M006AS (×8)
L1: GOWANDA 50-318
8
C14
3300pF
C15
0.1µF
T1: GOWANDA 50-319
1693 TA01
1