1
dc1886af
DEMO MANUAL DC1886A
Description
LTC4232:
5A Integrated
Hot Swap Controller
Demonstration circuit 1886A features the LTC4232 5A
Integrated Hot Swap™ Controller. The LTC4232 is ideally
suited for demanding power distribution control in 2.9V
to 15V applications for hot board insertion protection,
high side power switching, and electronic circuit breaker
functions. The LTC4232 provides a rich set of features to
support Hot Swap applications including:
• 2% accurate undervoltage and overvoltage protection
• Overtemperature protection
• Adjustable inrush current control
• Adjustable, 10% accurate current limit with program-
mable cutout time
performance summary
• Programmable output voltage ramp rate
• Configurable for auto-retry or latchoff on overcurrent
faults
• Power good and fault outputs
Available in a 16-lead 5mm × 3mm DFN package, the
LTC4232 is showcased on demonstration circuit 1886A,
configured for a 12V application. By changing a few pas-
sive components, 2.9V to 15V applications can easily be
evaluated.
Design files for this circuit board are available at
http://www.linear.com/demo
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
(T
A
= 25°C)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
DD
Input Supply Range
2.9
15
V
dVGATE/dt
GATE Pin Turn-On Ramp Rate
0.15
0.3
0.55
V/ms
R
ON
Sense Resistor On-Resistance
15
33
50
mΩ
I
LIM(TH)
Current Limit Threshold
V
FB
= 1.23V
5.0
5.6
6.1
A
I
LIM(TH)
Current Limit Threshold
V
FB
= 0V
V
FB
= 1.23V, R
SET
= 20k
1.2
2.6
1.5
2.9
1.8
3.3
A
A
V
TH
OV, UV, FB Pin Threshold Voltage
V
IN
Rising
1.21
1.235
1.26
V
V
UV(RTH)
UV Pin Reset Threshold Voltage
V
UV
Falling
0.55
0.62
0.7
V
V
FB(HYST)
FB Pin Power Good Hysteresis
10
20
30
mV
V
TIMER(H)
TIMER Pin High Threshold
V
TIMER
Rising
1.2
1.235
1.28
V
V
TIMER(L)
TIMER Pin Low Threshold
V
TIMER
Falling
0.1
0.21
0.3
V
I
TIMER(UP)
TIMER Pin Pull-Up Current
V
TIMER
= 0
–80
–100
–120
µA
I
TIMER(DN)
TIMER Pin Pulldown Current
V
TIMER
= 1.2V
1.4
2
2.6
µA
I
GATE(UP)
Gate Pull-Up Current
Gate Drive On, V
GATE
= V
OUT
= 12V
–18
–14
–29
µA
t
D(AUTO-RET)
Auto-Retry Turn-On Delay
50
100
150
ms
