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Linear Technology Electronic Components Datasheet

LTC4229 Datasheet

Ideal Diode and Hot Swap Controller

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Features
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
Applications
n Redundant Power Supplies
n Supply Holdup
n High Availability Systems and Servers
n Telecom and Network Infrastructure
n Power Prioritizer
LTC4229
Ideal Diode and
Hot Swap Controller
Description
The LTC®4229 offers ideal diode and Hot Swap™ functions
for a power rail by controlling two external N-channel MOS-
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.
Typical Application
Plug-In Supply Card Application
PLUG-IN
SUPPLY
DIODE FET
SiR818DP
HOT SWAP FET
0.0025Ω SiR818DP
CARD
12V +
680µF
0.1µF
10Ω 1k
10nF
VOUT
7.6A
21.5k
1.1k
2k
CPO DSRC IN DGATE DSNS SENSE+ SENSEHGATE
OUT
FB
UV
OV
DOFF GND DCFG
LTC4229
INTVCC RTMR DTMR
0.1µF
FTMR
PWRGD
FAULT
DSTAT
DFLT
EN
0.1µF
15k
2k
BACKPLANE
4229 TA01a
IN
10V/DIV
OUT
10V/DIV
DGATE
20V/DIV
HGATE
20V/DIV
For more information www.linear.com/LTC4229
Diode FET Protects Output
Voltage from Input Brownout
50µs/DIV
4229 TA01b
4229f
1


Linear Technology Electronic Components Datasheet

LTC4229 Datasheet

Ideal Diode and Hot Swap Controller

No Preview Available !

LTC4229
Absolute Maximum Ratings (Notes 1, 2)
Supply Voltages
IN............................................................ –0.3V to 24V
INTVCC...................................................... –0.3V to 7V
Input Voltages
FB, DCFG.................................................. –0.3V to 7V
FTMR, DTMR, RTMR..............–0.3V to INTVCC + 0.3V
UV, OV, EN, DOFF.................................... –0.3V to 24V
SENSE+, SENSE, DSNS, DSRC.............. –0.3V to 24V
Output Voltages
FAULT, PWRGD, DSTAT, DFLT, OUT......... –0.3V to 24V
CPO, DGATE (Note 3).............................. –0.3V to 35V
HGATE (Note 4)...................................... –0.3V to 35V
Average Currents
FAULT, PWRGD, DSTAT, DFLT................................5mA
INTVCC..................................................................1mA
Operating Ambient Temperature Range
LTC4229C................................................. 0°C to 70°C
LTC4229I..............................................–40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
G Package.......................................................... 300°C
Pin Configuration
TOP VIEW
DSRC
SENSE
SENSE+
IN
DSNS
INTVCC
GND
1
2
3
4
5
6
7
24 23 22 21 20
19 PWRGD
18 FAULT
17 DSTAT
25 16 DFLT
15 DOFF
14 DCFG
13 OV
8 9 10 11 12
UFD PACKAGE
24-LEAD (4mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 43°C/W (Note 5)
EXPOSED PAD (PIN 25) PCB GND CONNECTION OPTIONAL
CPO 1
DGATE 2
DSRC
SENSE
SENSE+
3
4
5
IN 6
DSNS 7
INTVCC 8
GND 9
DTMR 10
RTMR 11
FTMR 12
TOP VIEW
24 HGATE
23 OUT
22 FB
21 PWRGD
20 FAULT
19 DSTAT
18 DFLT
17 DOFF
16 DCFG
15 OV
14 UV
13 EN
G PACKAGE
24-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 88°C/W
Order Information
LEAD FREE FINISH
LTC4229CUFD#PBF
LTC4229IUFD#PBF
LTC4229CG#PBF
LTC4229IG#PBF
TAPE AND REEL
LTC4229CUFD#TRPBF
LTC4229IUFD#TRPBF
LTC4229CG#TRPBF
LTC4229IG#TRPBF
PART MARKING*
4229
4229
LTC4229G
LTC4229G
PACKAGE DESCRIPTION
24-Lead (4mm × 5mm) Plastic QFN
24-Lead (4mm × 5mm) Plastic QFN
24-Lead Plastic SSOP
24-Lead Plastic SSOP
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
4229f
2 For more information www.linear.com/LTC4229


Part Number LTC4229
Description Ideal Diode and Hot Swap Controller
Maker Linear
Total Page 28 Pages
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