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LTC4229 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4229
Description  Ideal Diode and Hot Swap Controller
Download  28 Pages
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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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LTC4229
1
4229f
For more information www.linear.com/LTC4229
Typical applicaTion
FeaTures
DescripTion
Ideal Diode and
Hot Swap Controller
The LTC®4229 offers ideal diode and Hot Swap™ functions
forapowerrailbycontrollingtwoexternalN-channelMOS-
FETs. The MOSFET acting as an ideal diode replaces a high
power Schottky diode and the associated heat sink, saving
power and board area. The Hot Swap MOSFET control al-
lows a board to be safely inserted and removed from a live
backplane by limiting inrush current. The supply output is
also protected against short-circuit faults with a fast acting
foldback current limit and electronic circuit breaker.
The LTC4229 regulates the forward voltage drop across
the external MOSFET to ensure smooth current transfer
in diode-OR applications. The ideal diode turns on quickly
to reduce the load voltage droop during supply switcho-
ver. If the input supply fails or is shorted, a fast turn-off
minimizes reverse-current transients.
The LTC4229 provides adjustable start-up delay, under-
voltage and overvoltage protection, and reports fault and
power good status for the supply. It can be configured
for latch off or automatic retry after a fault.
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.
Protected by U.S. Patents, including 7920013, 8022679.
Plug-In Supply Card Application
applicaTions
n
Ideal Diode and Inrush Current Control for
Redundant Supplies
n
Low Loss Replacement for Power Schottky Diode
n
Protects Output Voltage from Input Brownouts
n
Allows Safe Hot Swapping from a Live Backplane
n
2.9V to 18V Operating Range
n
Controls Back-to-Back N-Channel MOSFETs
n
Limits Peak Fault Current in ≤1µs
n
Adjustable Current Limit with Foldback
n
Adjustable Start-Up and Current Limit Fault Delay
n
0.5µs Ideal Diode Turn-On and Turn-Off Time
n
Undervoltage and Overvoltage Protection
n
Status, Fault and Power Good Outputs
n
Pin Selectable Latch Off or Automatic Retry
After Fault
n
24-Lead 4mm × 5mm QFN and SSOP Packages
n
Redundant Power Supplies
n
Supply Holdup
n
High Availability Systems and Servers
n
Telecom and Network Infrastructure
n
Power Prioritizer
Diode FET Protects Output
Voltage from Input Brownout
DCFG
DOFF
EN
4229 TA01a
DFLT
GND
INTVCC
FB
SENSE+ SENSE
UV
OV
DSTAT
RTMR
FAULT
PWRGD
DTMR
FTMR
CPO DSRC
HGATE
IN
DSNS
BACKPLANE
OUT
10
1k
680µF
10nF
12V
VOUT
7.6A
HOT SWAP FET
SiR818DP
PLUG-IN
SUPPLY
CARD
DGATE
DIODE FET
SiR818DP
0.0025
21.5k
1.1k
2k
+
0.1µF
0.1µF
0.1µF
15k
2k
LTC4229
50µs/DIV
IN
10V/DIV
OUT
10V/DIV
DGATE
20V/DIV
HGATE
20V/DIV
4229 TA01b


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