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LTC4229 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4229
Description  Single Ideal Diode and Hot Swap Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4229 Datasheet(HTML) 1 Page - Linear Technology

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1
dc2060af
DEMO MANUAL DC2060A
Description
LTC4229
Single Ideal Diode and
Hot Swap Controller
Demonstration circuit 2060A is a single-rail circuit with
an ideal diode and Hot Swap™ functionality provided by
the LTC®4229, ideal diode and Hot Swap controller. The
main components of this circuit are two series connected
N-channel MOSFETs, a power sense resistor, a few pas-
sive components, nine jumpers for selection of alternative
operation modes, and four LEDs for visual indication of
the controller signals. One of the MOSFETs operates as an
ideal diode and the other one as a Hot Swap power switch.
DC2060A facilitates evaluation of the LTC4229 in the dif-
ferent operation modes such as supply ramp-up, steady
state, overcurrent faults, and power supply switchover.
Power supply switchover mode can be realized when the
LTC4229 controller operates in a prioritizer set up or when
a second ideal diode circuit is added.
The DC2060A circuit is assembled to operate with a 12V
supply and 10A maximum current load. The operating
voltage can be easily readjusted for any voltage between
2.9V and 18V.
Pads on key nodes are intended to be used as test points.
TheLTC4229controllerhastwoindependentpins(SENSE+
and SENSE) for the current sense signal. That simplifies
using two configurations with the series connection of the
ideal diode MOSFET and Hot Swap MOSFET. The ability of
theLTC4229toregulatetheidealdiodevoltagebetweenthe
IN and DSNS pins allows the use of two distinctive paths
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.
performance summary
for the ideal diode voltage regulation. The combination of
both features allows the implementation of four different
configurations.
The typical configuration (as DC2060A is populated by
default) has the ideal diode MOSFET ahead of the Hot
Swap MOSFET with voltage regulation across the ideal
diode MOSFET. There is an option to use two back-to-back
MOSFETs instead of one ideal diode MOSFET to prevent
powering the load before the gate voltage of the ideal diode
MOSFET ramps up.
The LTC4229 provides voltage regulation to the ideal
diode across the single ideal diode MOSFET or across
three series connected components: ideal diode MOSFET,
sense resistor, and Hot Swap MOSFET.
The bottom side of the board includes pads for an alter-
native configuration with the Hot Swap MOSFET located
ahead of the ideal diode.
Provision is made for the selection of ideal diode regula-
tion components: single ideal diode MOSFET or series
connected ideal diode MOSFET, sense resistor, and Hot
Swap MOSFET.
Design files for this circuit board are available at
http://www.linear.com/demo
Specifications are at TA = 25°C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Hot Swap
VNOM
Demo Board Rail Voltage
9.8
12.0
15.2
V
ILIM
Assembled Circuit Current Limit
FB = 1.23V, VOUT ≥ 10.5V
FB = 0, VOUT < 2.5V
8.9
2.4
10.0
3.3
11.2
4.3
A
A
S
Output Voltage Slew Rate with No Load
630
950
1300
V/s
Ideal Diode
ΔVFWD(REG)
Forward Regulation Voltage (VIN – VDSNS)
35
50
65
mV


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