QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 536
HOT SWAP CONTROLLER WITH MULTIFUNCTION CURRENT CONTROL
1
LTC4211
DESCRIPTION
Demonstration circuit DC536 is a Hot Swap controller
with multifunction current control featuring the
LTC4211. The DC536 is configured to operate with up to
7A as populated by the factory. Optional component
pads are provided for a higher power pass FET and
sense resistor for operation up to 20A.
The DC536 permits evaluating the LTC4211 during
turn-on and turn-off transients as well as during steady
state conditions.
Design files for this circuit board are available. Call
the LTC factory.
, LTC and Hot Swap are registered trademarks of Linear Technology Corpora-
tion.
Table 1.
Performance Summary (T
A
= 25°C)
PARAMETER
CONDITION
VALUE
Supply Voltage
Rated operating limits
2.5V
≤
VCC
≤
16.5V
Under Voltage Lockout
Transition to operating mode
2.13V
≤
V
CC(UVL)
≤
2.47V
ON Pin Threshold Voltage, High
1.23V
≤
V
CC(UVL)
≤
1.39V
ON Pin Threshold Voltage, Low
1.20V
≤
V
CC(UVL)
≤
1.26V
Gate Pull-Up current
Charge Pump On, V
GATE
0.2V
7.5µA
≤
I
GATE
≤
12.5µA
ON Pin Signal Low
130µA
≤
I
GATE
≤
270µA
Normal Gate Pull-Down Current
Fast Gate Pull-Down Current
• Latched and Circuit Breaker Tripped or in UVLO
50mA
Current Limit
Si4410 and 7m
Ω
SENSE Resistor
FDB8030L and 2.5m
Ω
SENSE Resistor
5.7A
≤
I
LIMIT
≤
8.5A
16A
≤
I
LIMIT
≤
24A
Supply Voltage
Rated operating limits
2.5V
≤
VCC
≤
16.5V
2.13V
≤
V
CC(UVL)
≤
2.47V
Under Voltage Lockout
ON Pin Threshold Voltage, High
1.23V
≤
V
CC(UVL)
≤
1.39V
1.20V
≤
V
CC(UVL)
≤
1.26V
ON Pin Threshold Voltage, Low
Gate Pull-Up current
Charge Pump On, V
GATE
0.2V
7.5µA
≤
I
GATE
≤
12.5µA
Normal Gate Pull-Down Current
ON Pin Signal Low
130µA
≤
I
GATE
≤
270µA
OPERATING PRINCIPLES
The LTC4211 is a low voltage hot swap controller that
has a 2.5V to 16.5V operating range and a 17V absolute
maximum operating voltage for the Vcc pin. This demo
circuit is populated for +5V operation, but it can easily
be re-adjusted for any voltage between 2.5V to 16.5V by
replacing R3 and R1 (top resistors in the feedback di-
vider and the ON pin signal divider). There are two as-
sembly options for load current. The DC536 as supplied
by the factory is populated with an Si4410 MOSFET in an
SO-8 package and a 7m
Ω
current sense resistor provid-
ing a minimum 5A load current. The DC536 has provi-
sion for an FDB8030L MOSFET in the DD package which
when used with a 2.5m
Ω
sense resistor provides a
minimum16A load current.
