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Linear Technology Electronic Components Datasheet

LTC4215-2 Datasheet

Hot Swap Controller

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LTC4215/LTC4215-2
Hot Swap Controller with
I2C Compatible Monitoring
FEATURES
n Allows Safe Insertion into Live Backplane
n 8-Bit ADC Monitors Current and Voltage
n I2C/SMBus Interface
n Wide Operating Voltage Range: 2.9V to 15V
n 20μs (LTC4215) or 420μs (LTC4215-2) Circuit
Breaker Timeout
n dI/dt Controlled Soft-Start
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
n LTC4215 also available in 16-Lead Narrow SSOP
Package
APPLICATIONS
n Live Board Insertion
n Electronic Circuit Breakers
n Computers, Servers
n Platform Management
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.
Protected by U.S. Patent including 7330065.
DESCRIPTION
The LTC®4215/LTC4215-2 Hot Swap™ controllers allow
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 I2C 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 I2C 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 I2C command
to turn on.
The LTC4215 has a 20μs circuit breaker filter for applica-
tions that require a fast fault response time and it defaults
to latchoff after an overcurrent fault. The LTC4215-2 has
an extended 420μs circuit breaker filter for applications
where supply transients may exceed 20μs and it defaults
to restart automatically after an overcurrent fault.
TYPICAL APPLICATION
12V Application with 5A Circuit Breaker
12V
0.005Ω
FDC653N
+
VOUT
12V
34.8k
0.1μF
CL 30.1k
10Ω
SDA
SCL
ALERT
GND
BACKPLANE PLUG-IN
CARD
1.18k
P6KE16A
3.4k
INTVCC
UV VDD SENSE+ SENSEGATE SOURCE
OV FB
SDAO
SDAI
SCL
ALERT
LTC4215UFD
EN
ADIN
INTVCC
ON TIMER SS
GPIO
GND
0.1μF
68nF
3.57k
INTVCC
24k
4215 TA01a
Start-Up Waveform
VDD
10V/DIV
INRUSH
CURRENT
2.5A/DIV
VOUT
10V/DIV
VGPIO
(POWERGOOD)
10V/DIV
CONTACT
BOUNCE
CL = 12000μF
50ms/DIV
42151 TA01b
4215fe
1


Linear Technology Electronic Components Datasheet

LTC4215-2 Datasheet

Hot Swap Controller

No Preview Available !

LTC4215/LTC4215-2
ABSOLUTE MAXIMUM RATINGS (Notes 1, 2)
Supply Voltage (VDD) ................................ –0.3V to 24V
Supply Voltage (INTVCC) .......................... –0.3V to 6.5V
Input Voltages
GATE-SOURCE (Note 3).......................... –0.3V to 5V
SENSE+, SENSE................ VDD – 0.3V to VDD + 0.3V
SOURCE.................................................... –5V to 24V
EN, FB, ON, OV, UV ................................ –0.3V to 12V
ADR0, ADR1, ADR2, TIMER,
ADIN, SS................................ –0.3V to INTVCC + 0.3V
ALERT SCL, SDA, SDAI, SDAO ............. –0.3V to 6.5V
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
Lead Temperature (Soldering, 10 sec)
SSOP ................................................................ 300°C
PIN CONFIGURATION
LTC4215
SENSE1
VDD 2
UV 3
SS 4
GND 5
ON 6
SDA 7
SCL 8
TOP VIEW
16 GATE
15 SOURCE
14 FB
13 GPIO
12 INTVCC
11 TIMER
10 ADR0
9 ALERT
GN PACKAGE
16-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 130°C/W
LTC4215/LTC4215-2
TOP VIEW
UV 1
OV 2
SS 3
GND 4
ON 5
EN 6
SDAO 7
24 23 22 21 20
19 FB
18 GPIO
17 INTVCC
25 16 TIMER
15 ADIN
14 ADR2
13 ADR1
8 9 10 11 12
UFD PACKAGE
24-LEAD (4mm s 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 25) NOT GUARANTEED LOW IMPEDANCE TO GND,
ELECTRICAL CONNECTION OPTIONAL
ORDER INFORMATION
LEAD FREE FINISH
LTC4215CGN#PBF
LTC4215IGN#PBF
LTC4215CUFD#PBF
LTC4215IUFD#PBF
LTC4215CUFD-2#PBF
LTC4215IUFD-2#PBF
TAPE AND REEL
LTC4215CGN#TRPBF
LTC4215IGN#TRPBF
LTC4215CUFD#TRPBF
LTC4215IUFD#TRPBF
LTC4215CUFD-2#TRPBF
LTC4215IUFD-2#TRPBF
PART MARKING*
4215
4215I
4215
4215
42152
42152
PACKAGE DESCRIPTION
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
24-Lead (4mm × 5mm) Plastic QFN
24-Lead (4mm × 5mm) Plastic QFN
24-Lead (4mm × 5mm) Plastic QFN
24-Lead (4mm × 5mm) Plastic QFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
4215fe
2


Part Number LTC4215-2
Description Hot Swap Controller
Maker Linear
Total Page 28 Pages
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