Linear Technology DC536 Quick Start Manual

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 536
HOT SWAP CONTROLLER WITH MULTIFUNCTION CURRENT CONTROL
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.
Table 1. Performance Summary (T
PARAMETER
Supply Voltage
Under Voltage Lockout
ON Pin Threshold Voltage, High
ON Pin Threshold Voltage, Low
Gate Pull-Up current
Normal Gate Pull-Down Current
Fast Gate Pull-Down Current
Current Limit
Supply Voltage
Under Voltage Lockout
ON Pin Threshold Voltage, High
ON Pin Threshold Voltage, Low
Gate Pull-Up current
Normal Gate Pull-Down Current
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-
= 25°C)
A
CONDITION
Rated operating limits
Transition to operating mode
Charge Pump On, V
ON Pin Signal Low
• Latched and Circuit Breaker Tripped or in UVLO
Si4410 and 7mΩ SENSE Resistor
FDB8030L and 2.5mΩ SENSE Resistor
Rated operating limits
Charge Pump On, V
ON Pin Signal Low
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.
0.2V
GATE
0.2V
GATE
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 7mΩ 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 2.5mΩ sense resistor provides a
minimum16A load current.
LTC4211
VALUE
2.5V ≤ VCC ≤ 16.5V
2.13V ≤ V ≤ 2.47V
CC(UVL)
1.23V ≤ V ≤ 1.39V
CC(UVL)
1.20V ≤ V ≤1.26V
CC(UVL)
7.5µA ≤ I ≤ 12.5µA
GATE
130µA ≤ I ≤ 270µA
GATE
50mA
5.7A ≤I ≤ 8.5A
LIMIT
16A ≤ I ≤ 24A
LIMIT
2.5V ≤ VCC ≤ 16.5V
2.13V ≤ V ≤ 2.47V
CC(UVL)
1.23V ≤ V ≤ 1.39V
CC(UVL)
1.20V ≤ V ≤1.26V
CC(UVL)
7.5µA ≤ I ≤ 12.5µA
GATE
130µA ≤ I ≤ 270µA
GATE
1