Linear Analog Devices DC2749A Manual

DESCRIPTION
Demonstration circuit 2749A is a 60V protected, high
side switch featuring the
designed to switch a 14.5A output load from input volt-
ages from 6V to 60V. The wide input range and low shut-
down current (1µA typical) make it suitable for automo-
tive, industrial, medical instrument and telecom applica-
tions. This board offers a low 45ns (typical) propagation
delay, fast switching times (<10ns) and 100% duty cycle
operation.
The LTC7003 is a fast protected high side N-channel
MOSFET driver. An internal charge pump fully enhances
an external N-channel MOSFET switch, allowing it to
remain on indefinitely. Its powerful gate driver can drive
large gate capacitance MOSFETs with very short transition
times, ideal for both high frequency switching and static
switch applications. The LTC7003 operates over a 3.5V to
60V input supply range. When an external current sense
resistor and internal comparator sense that the switch
current has exceeded a preset level, a fault flag is asserted
and the switch is turned off after a period of time set
by an external timing capacitor. After a cooldown period,
the LTC7003 can be configured to automatically retry or
remain off until the input is recycled.
PERFORMANCE SUMMARY
SYMBOL PARAMETER
V Input Voltage
IN
I Output Current
OUT
Insertion Drop
V Start-Up Voltage
IN
V V Undervoltage Lockout
CCUV CC
Overcurrent to V Low
OUT
Input to Output Propagation Delay
Output Rise Time
LTC 7003. The demo board is
®
Specifications are at T
CONDITIONS
V – V , 14.5A Load, Input to Output Terminals
IN OUT
V = 4V
INP
100kΩ Load
V Rising
CC
V Falling
CC
Hysteresis
Turn-On into a 25A Resistive Load
V = 60V, 50Ω Load, INP = 2.2V to V
IN
V = 60V, 50Ω Load, 10% to 90%
IN
DEMO MANUAL DC2749A
Fast 60V Protected High Side
NMOS Static Switch Driver
The demo board includes input capacitors and output
diode to accommodate input and output supply induc-
tance when switching loads. The switch can be controlled
directly with external signal or using the on-board on/off
switch. A single-shot pulse generator is included for evalu-
ating switching times while limiting output power. Optional
auxiliary V input accommodates gate power associated
CC
with high frequency switching. Positions for RC delay net-
work to control inrush current are also included.
The LTC7003 data sheet gives a complete description of
the part, operation and application information. The data
sheet must be read in conjunction with this demo manual
for demo circuit 2749A. Proper board layout is essential
for maximum thermal and electrical performance. See the
data sheet sections for details. The LTC7003 is available
in 16-lead MSOP package and three operating junction
temperature grades extended and industrial from –40°C
to 125°C, high temp automotive from –40°C to 150°C and
a military grade from –55°C to 150°C.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2749A
All registered trademarks and trademarks are the property of their respective owners.
= 25°C
A
= 6V
OUT
LTC7003
MIN TYP MAX UNITS
60
14.5
81
7.0
6.0
5.1
4.6
0.5
19
45
9
dc2749af
V
A
mV
V
V
V
V
V
µs
ns
ns
1