safely inserted and removed from a live backplane. Using
an external N-channel pass transistor, board supply voltage
and inrush current are ramped up at an adjustable rate.
An I
2
C interface and onboard ADC allow for monitoring
of load current, voltage and fault status.
The device features adjustable foldback current limit and
a soft-start pin that sets the dI/dt of the inrush current.
An I
2
C interface may configure the part to latch off or
automatically restart after the LTC4215 detects a current
limit fault.
The controller has additional features to interrupt the host
when a fault has occurred, notify when output power is
good, detect insertion of a load card, and power-up either
automatically upon insertion or wait for an I
2
C command
to turn on.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Hot Swap is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIO S
■
■
■
■
Live Board Insertion
Electronic Circuit Breakers
Computers, Servers
Platform Management
TYPICAL APPLICATIO
12V
34k
0.005Ω
FDC653N
+
C
L
10Ω
1.74k
20V
2.67k
UV V
DD
SENSE
+
SENSE
–
GATE SOURCE
OV
FB
SDAO
EN
SDAI
LTC4215UFD
SCL
ADIN
ALERT
GPIO
INTV
CC
ON TIMER SS
GND
68nF
0.1µF
CONNECTOR 2
CONNECTOR 1
V
OUT
12V
30.1k
V
DD
10V/DIV
INRUSH
CURRENT
2.5A/DIV
CONTACT
BOUNCE
3.57k
SDA
SCL
ALERT
0.1µF
24k
V
OUT
10V/DIV
V
GPIO
(POWERGOOD)
10V/DIV
4215 TA01a
C
L
= 12000µF
GND
BACKPLANE PLUG-IN
CARD
U
50ms/DIV
4215 TA01b
U
U
4215fb
1
LTC4215
ABSOLUTE
AXI U RATI GS
Supply Voltage (V
DD
) ................................ –0.3V to 24V
Supply Voltage (INTV
CC
) .......................... –0.3V to 6.5V
Input Voltages
GATE-SOURCE (Note 3) .......................... –0.3V to 5V
SENSE
+
, SENSE
–
................ V
DD
– 0.3V to V
DD
+ 0.3V
SOURCE.................................................... –5V to 24V
⎯
E
⎯
N, FB, ON, OV, UV ................................ –0.3V to 12V
ADR0, ADR1, ADR2, TIMER,
ADIN, SS................................ –0.3V to INTV
CC
+ 0.3V
⎯
A
⎯
L
⎯
E
⎯
R
⎯
T SCL, SDA, SDAI, SDAO ............ –0.3V to 6.5V
PACKAGE/ORDER I FOR ATIO
TOP VIEW
SENSE
–
V
DD
UV
SS
GND
ON
SDA
SCL
1
2
3
4
5
6
7
8
16 GATE
15 SOURCE
14 FB
13 GPIO
12 INTV
CC
11 TIMER
10 ADR0
9
ALERT
24 23 22 21 20
UV 1
OV 2
SS 3
GND 4
ON 5
EN 6
SDAO 7
8
SDAI
9 10 11 12
ALERT
SCL
NC
ADR0
25
19 FB
18 GPIO
17 INTV
CC
16 TIMER
15 ADIN
14 ADR2
13 ADR1
GN PACKAGE
16-LEAD PLASTIC TSSOP
T
JMAX
= 125°C,
θ
JA
= 130°C/W
UFD PACKAGE
24-LEAD (4mm
×
5mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 25) NOT GUARANTEED LOW IMPEDANCE TO GND,
ELECTRICAL CONNECTION OPTIONAL
ORDER PART NUMBER
LTC4215CGN
LTC4215IGN
GN PART MARKING
4215
4215I
ORDER PART NUMBER
LTC4215CUFD
LTC4215IUFD
UFD PART MARKING*
4215
4215
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
http://www.linear.com/leadfree/
*The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges.
SOURCE
SENSE
+
SENSE
–
GATE
V
DD
2
U
U
W
W W
U
W
(Notes 1, 2)
Output Voltages
GATE, GPIO............................................ –0.3V to 24V
Operating Temperature Range
LTC4215C ................................................ 0°C to 70°C
LTC4215I ............................................. –40°C to 85°C
Storage Temperature Range
SSOP ................................................. –65°C to 150°C
QFN.................................................... –65°C to 125°C
MSP430F4XX User's Guide上有这么一句：
When using the WDT in the watchdog mode, the WDTIFG flag sources a reset
vector interrupt. The WDTIFG can be used by the reset int ......
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