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LTC4280CUFD#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
LTC4280
1
4280f
TYPICAL APPLICATION
DESCRIPTION
Hot Swap Controller with
I
2
C Compatible Monitoring
The LTC
®
4280 Hot Swap™ controller allows a board to be
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 analog foldback current
limit and a FILTER pin which confi gures the time spent in
overcurrent before declaring a fault. An I
2
C interface may
confi gure the part to latch off or automatically restart after
the LTC4280 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.
FEATURES
APPLICATIONS
n
Live Board Insertion
n
Electronic Circuit Breakers
n
Computers, Servers
n
Platform Management
n
Allows Safe Insertion into Live Backplane
n
8-Bit ADC Monitors Current and Voltage
n
I
2
C/SMBus Interface
n
Wide Operating Voltage Range: 2.9V to 15V
n
Adjustable Overcurrent Filter Time
n
High Side Drive for External N-Channel MOSFET
n
No External Gate Capacitor Required
n
Input Overvoltage/Undervoltage Protection
n
Optional Latchoff or Auto-Retry After Faults
n
Alerts Host After Faults
n
Inrush Current Limit with Foldback
n
Available in 24-Pin 4mm × 5mm QFN Package
+
UV V
DD
SENSE
+
SENSE
–
LTC4280
GATE
TIMER FILTERON GND
SOURCE
OV
SDAO
SDAI
SCL
ALERT
INTV
CC
FB
EN
ADIN
GPIO
3.4k
PLUG-IN
CARD
1.18k
P6KE16A
10
0.005
FDC653N
30.1k
V
OUT
12V
3.57k
24k
4280 TA01
C
L
INTV
CC
INTV
CC
0.1µF
CONNECTOR 2
CONNECTOR 1
0.1µF
34.8k
BACKPLANE
47nF
GND
ALERT
SCL
SDA
12V
V
OUT
10V/DIV
V
GPIO
(POWERGOOD)
10V/DIV
INRUSH
CURRENT
2.5A/DIV
V
DD
10V/DIV
50ms/DIV
4280 TA02
C
L
= 12000µF
CONTACT
BOUNCE
12V Application with 5A Circuit Breaker Start-Up Waveform
L, LT, LTC, LTM, Linear Technology, the Linear logo and Hot Swap are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
LTC4280
2
4280f
ABSOLUTE MAXIMUM RATINGS
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
EN, FB, ON, OV, UV ................................–0.3V to 12V
ADR0, ADR1, ADR2, TIMER,
ADIN, FILTER .........................–0.3V to INTV
CC
+ 0.3V
ALERT SCL, SDA, SDAI, SDAO ............. –0.3V to 6.5V
Output Voltages
GATE, GPIO ............................................ –0.3V to 24V
Operating Temperature Range
LTC4280C ................................................ 0°C to 70°C
LTC4280I..............................................–40°C to 85°C
Storage Temperature Range
SSOP .................................................–65°C to 150°C
QFN ....................................................–65°C to 125°C
Lead Temperature (Soldering, 10 sec)
SSOP ................................................................ 300°C
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4280CUFD#PBF LTC4280CUFD#TRPBF 4280
24-Lead (4mm × 5mm) Plastic QFN
0°C to 70°C
LTC4280IUFD#PBF LTC4280IUFD#TRPBF 4280
24-Lead (4mm × 5mm) Plastic QFN
–40°C to 85°C
LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4280CUFD LTC4280CUFD#TR 4280
24-Lead (4mm × 5mm) Plastic QFN
0°C to 70°C
LTC4280IUFD LTC4280IUFD#TR 4280
24-Lead (4mm × 5mm) Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi
cations, go to: http://www.linear.com/tapeandreel/
PIN CONFIGURATION
(Notes 1, 2)
8 9
TOP VIEW
25
UFD PACKAGE
24-LEAD (4mm s 5mm) PLASTIC QFN
10 11 12
24 23 22 21 20
6
5
4
3
2
1
UV
OV
FILTER
GND
ON
EN
SDAO
FB
GPIO
INTV
CC
TIMER
ADIN
ADR2
ADR1
V
DD
SENSE
+
SENSE
–
GATE
SOURCE
SDAI
SCL
ALERT
NC
ADR0
7
14
15
16
17
18
19
13
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 25) NOT GUARANTEED LOW IMPEDANCE TO GND,
ELECTRICAL CONNECTION OPTIONAL
LTC4280
3
4280f
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
DD
= 12V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Supplies
V
DD
Input Supply Range
l
2.9 15 V
V
OV(VDD)
Input Supply Overvoltage Threshold
l
15 15.6 16.5 V
I
DD
Input Supply Current
l
35 mA
V
DD(UVL)
Input Supply Undervoltage Lockout V
DD
Rising
l
2.75 2.84 2.89 V
V
DD(HYST)
Input Supply Undervoltage Lockout Hysteresis
l
75 100 125 mV
INTV
CC
Internal Regulator Voltage V
DD
≥ 3.3V
l
2.9 3.1 3.4 V
INTV
CC(UVL)
INTV
CC
Undervoltage Lockout INTV
CC
Rising
l
2.55 2.64 2.79 V
INTV
CC(HYST)
INTV
CC
Undervoltage Lockout Hysteresis
l
20 55 75 mV
Current Limit and Circuit Breaker
∆V
SENSE(TH)
Circuit Breaker Threshold (V
DD
– V
SENSE
)
l
22.5 25 27.5 mV
∆V
SENSE
Current Limit Voltage (V
DD
– V
SENSE
)V
FB
= 1.3V
V
FB
= 0V
l
l
22.5
7
26
10
29.5
13.5
mV
mV
I
SENSE(IN)
SENSE +/– Input Current
V
SENSE
= 12V
l
10 20 35 µA
Gate Drive
∆V
GATE
External N-Channel Gate Drive (V
GATE
– V
SOURCE
)
(Note 3)
V
DD
= 2.9V to 15V
l
4.7 5.9 6.5 V
I
GATE(UP)
External N-Channel Gate Pull-Up Current Gate On, V
GATE
= 0V
l
–15 –20 –30 µA
I
GATE(DN)SLOW
External N-Channel Gate Pulldown Current Gate Off, V
GATE
= 15V
l
0.8 1 1.6 mA
I
GATE(DN)FAST
Pulldown Current From GATE to SOURCE
During OC/UVLO
V
DD
– SENSE = 100mV, V
GS
= 4V
l
300 450 700 mA
t
PHL(SENSE)
(V
DD
– SENSE) High to GATE Low V
DD
– SENSE = 100mV, C
GS
= 10nF
l
0.5 1 µs
V
GS(POWERBAD)
Gate-Source Voltage for Power Bad Fault V
SOURCE
= 2.9V – 15V
l
3.8 4.3 4.7 V
Comparator Inputs
V
ON(TH)
ON Pin Threshold Voltage V
ON
Rising
l
1.210 1.235 1.26 V
∆V
ON(HYST)
ON Pin Hysteresis
l
60 128 180 mV
I
ON(IN)
ON Pin Input Current V
ON
= 1.2V
l
0
±1
µA
V
EN(TH)
EN Input Threshold V
EN
= Rising
l
1.215 1.235 1.255 V
∆V
EN(HYST)
EN Hysteresis
l
50 128 200 mV
I
EN
EN Pin Input Current EN = 3.5V
l
0
±1
µA
V
OV(TH)
OV Pin Threshold Voltage V
OV
Rising
l
1.215 1.235 1.255 V
∆V
OV(HYST)
OV Pin Hysteresis
l
10 30 40 mV
I
OV(IN)
OV Pin Input Current V
OV
= 1.8V
l
0
±1
µA
V
UV(TH)
UV Pin Threshold Voltage V
UV
Rising
l
1.215 1.235 1.255 V
∆V
UV(HYST)
UV Pin Hysteresis
l
60 80 100 mV
I
UV(IN)
UV Pin Input Current V
UV
= 1.8V
l
0
±1
µA
V
UV(RTH)
UV Pin Reset Threshold Voltage V
UV
Falling
l
0.33 0.4 0.47 V
∆V
UV(RHYST)
UV Pin Reset Threshold Hysteresis
l
60 125 210 mV
V
FB
Foldback Pin Power Good Threshold FB Rising
l
1.215 1.235 1.255 V
∆V
FB(HYST)
FB Pin Power Good Hysteresis
l
3815 mV
I
FB
Foldback Pin Input Current FB = 1.8V
l
0
±1
µA
V
GPIO(TH)
GPIO Pin Input Threshold V
GPIO
Rising
l
0.8 1 1.2 V
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LTC4280CUFD#PBF

Mfr. #:
Buy LTC4280CUFD#PBF
Manufacturer:
Analog Devices Inc.
Description:
Hot Swap Voltage Controllers Hot Swap Contr. w/ADC and I2C, 3 GPIOs
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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