ADC 2 Specifications

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LTC4261/LTC4261-2
1
42612fd
For more information www.linear.com/LTC4261
Negative Voltage
Hot Swap Controllers with
ADC and I
2
C Monitoring
The LT C
®
4261/LTC4261-2 negative voltage Hot Swap
TM
controllers allow a board to be safely inserted and removed
from a live backplane. Using an external N-channel pass
transistor, the board supply voltage can be ramped at an
adjustable rate. The devices feature independently adjust
-
able inrush current and overcurrent limits to minimize
stresses on the pass transistor during start-up, input
step and output short conditions. The L
TC4261 defaults
to latch-off while the L
TC4261-2 defaults to auto-retry on
overcurrent faults.
An I
2
C interface and onboard 10-bit ADC allow monitoring
of board current, voltage and fault status. A single-wire
broadcast mode is available to simplify the interface by
eliminating two optoisolators.
The controllers have additional features to interrupt the
host when a fault has occurred, notify when output power
is good, detect insertion of a board and turn off the pass
transistor if an external supply monitor fails to indicate
power good within a timeout period.
n
AdvancedTCA Systems
n
Telecom Infrastructure
n
–48V Distributed Power Systems
n
Power Monitors
n
Allows Safe Insertion into Live –48V Backplanes
n
10-Bit ADC Monitors Current and Voltages
n
I
2
C/SMBus Interface or Single-Wire Broadcast Mode
n
Floating Topology Allows Very High Voltage
Operation
n
Independently Adjustable Inrush and Overcurrent
Limits
n
Controlled Soft-Start Inrush
n
Adjustable UV/OV Thresholds and Hysteresis
n
Sequenced Power Good Outputs with Delays
n
Adjustable Power Good Input Timeout
n
Programmable Latchoff or Auto-Retry After Faults
n
Alerts Host After Faults
n
Available in 28-Lead Narrow SSOP and 24-Lead
(4mm × 5mm) QFN Packages
–48V/200W Hot Swap Controller with I
2
C and ADC
+
PGI
ALERT
SDAO
SDAI
SCL
ADIN
PGIO
PG
UVL
UVH
ADIN2
OV
INTV
CC
ON
RAMPDRAINGATE
LTC4261CGN
V
IN
V
EE
ENTMRSS SENSE
1M
4 × 1k IN SERIES
1/4W EACH
453k
1%
–48V RTN
–48V INPUT
UV = 38.5V
UV RELEASE
AT 43V
OV RELEASE
AT 71V
OV = 72.3V
16.9k
1%
11.8k
1%
10nF
100V
5%
47nF0.1µF
F
220nF
47nF
0.008Ω
1%
10Ω
V
OUT
Q1
IRF1310NS
1k
330µF
100V
LOAD
ON
42612 TA01
V
IN
+
V
IN
Start-Up Behavior
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
–48V INPUT
50V/DIV
V
OUT
50V/DIV
SENSE
0.5A/DIV
PG
50V/DIV
10ms/DIV
42612 TA01b
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 7382167, 8194379, 8230151.
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Summary of Contents

Page 1 - Start-Up Behavior

LTC4261/LTC4261-2142612fdFor more information www.linear.com/LTC4261Negative Voltage Hot Swap Controllers with ADC and I2C MonitoringThe LT C®4261/LT

Page 2 - PIN CONFIGURATION

LTC4261/LTC4261-21042612fdFor more information www.linear.com/LTC4261VEE (Pin 13/Pin 8): Negative Supply Voltage Input and Device Ground. Connect this

Page 3 - ELECTRICAL CHARACTERISTICS

LTC4261/LTC4261-21142612fdFor more information www.linear.com/LTC4261BLOCK DIAGRAM+–UVLO:VIN = 9VINTVCC = 4.25VVEEVEEVEEVSENSE50mVVEEVEEVINVINVCCSSASS

Page 4

LTC4261/LTC4261-21242612fdFor more information www.linear.com/LTC4261The LTC4261/LTC4261-2 are designed to turn a board’s supply voltage on and off in

Page 5

LTC4261/LTC4261-21342612fdFor more information www.linear.com/LTC4261The LTC4261/LTC4261-2 are ideally suited for –48V distributed power systems and A

Page 6

LTC4261/LTC4261-21442612fdFor more information www.linear.com/LTC42612216528274 3VEER6100kRIN8 × 240Ω IN SERIES1/4W EACHCVCC0.1µFVEECIN1µFMOC207217 2

Page 7

LTC4261/LTC4261-21542612fdFor more information www.linear.com/LTC426110µA until the voltage at TMR reaches 2.56V. CTMR is then quickly discharged with

Page 8

LTC4261/LTC4261-21642612fdFor more information www.linear.com/LTC42616. The voltage at INTVCC is lower than 4.25V (INTVCC undervoltage lockout). 7. VS

Page 9

LTC4261/LTC4261-21742612fdFor more information www.linear.com/LTC4261EN and ONFigure 5 shows a logic diagram for EN and ON as they relate to GATE, ALE

Page 10 - PIN FUNCTIONS

LTC4261/LTC4261-21842612fdFor more information www.linear.com/LTC4261Figure 6. Overcurrent Fault and Auto-RetryIn the case of a low impedance short ci

Page 11 - BLOCK DIAGRAM

LTC4261/LTC4261-21942612fdFor more information www.linear.com/LTC4261overvoltage auto-retry has been disabled by clearing reg-ister bit D0.Undervoltag

Page 12 - OPERATION

LTC4261/LTC4261-2242612fdFor more information www.linear.com/LTC4261VIN (Note 3) ... –0.3V to 10.65VDrain (Not

Page 13 - APPLICATIONS INFORMATION

LTC4261/LTC4261-22042612fdFor more information www.linear.com/LTC4261Figure 8. Adjustment of Undervoltage Thresholds for Larger (8a) or Smaller (8b) H

Page 14

LTC4261/LTC4261-22142612fdFor more information www.linear.com/LTC4261fault will cause the ALERT pin to pull low. After the bus master controller broad

Page 15

LTC4261/LTC4261-22242612fdFor more information www.linear.com/LTC4261Ejector Switch or Loop-Through Connection Sense. Floating switch contacts or a co

Page 16

LTC4261/LTC4261-22342612fdFor more information www.linear.com/LTC4261Configuring the PGIO Pin Table 6 describes the possible states of the PGIO pin us

Page 17

LTC4261/LTC4261-22442612fdFor more information www.linear.com/LTC4261I2C InterfaceThe LTC4261/LTC4261-2 feature an I2C interface to pro-vide access to

Page 18

LTC4261/LTC4261-22542612fdFor more information www.linear.com/LTC4261START and STOP ConditionsWhen the bus is idle, both SCL and SDA must be high. A b

Page 19

LTC4261/LTC4261-22642612fdFor more information www.linear.com/LTC4261master acknowledges the transmitted data byte, as in a Read Word command, the LTC

Page 20

LTC4261/LTC4261-22742612fdFor more information www.linear.com/LTC4261Figure 17. Single-Wire Broadcast ModeFigure 18. Single-Wire Broadcast Data Format

Page 21

LTC4261/LTC4261-22842612fdFor more information www.linear.com/LTC4261Table 1. LTC4261 Device AddressingDESCRIPTIONHEX DEVICEADDRESS BINARY DEVICE ADDR

Page 22

LTC4261/LTC4261-22942612fdFor more information www.linear.com/LTC4261Table 3. STATUS Register A (00h)—Read OnlyBIT NAME OPERATIONA7 FET On Indicates S

Page 23

LTC4261/LTC4261-2342612fdFor more information www.linear.com/LTC4261 The l denotes the specifications which apply over the full operating temperature

Page 24

LTC4261/LTC4261-23042612fdFor more information www.linear.com/LTC4261Table 6. CONTROL Register D (03h)—Read/WriteBIT NAME OPERATIOND7:6 PGIO Configure

Page 25

LTC4261/LTC4261-23142612fdFor more information www.linear.com/LTC4261TYPICAL APPLICATIONPACKAGE DESCRIPTIONUsing the LTC4261 and a Thermistor to Monit

Page 26

LTC4261/LTC4261-23242612fdFor more information www.linear.com/LTC4261PACKAGE DESCRIPTIONPlease refer to http://www.linear.com/designtools/packaging/ f

Page 27

LTC4261/LTC4261-23342612fdFor more information www.linear.com/LTC4261Information furnished by Linear Technology Corporation is believed to be accurate

Page 28

LTC4261/LTC4261-23442612fdFor more information www.linear.com/LTC4261 LINEAR TECHNOLOGY CORPORATION 2005LT 0614 REV D • PRINTED IN USALinear Technolo

Page 29

LTC4261/LTC4261-2442612fdFor more information www.linear.com/LTC4261SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITSTimerVTMR(H)TMR Pin High Threshold VT

Page 30

LTC4261/LTC4261-2542612fdFor more information www.linear.com/LTC4261SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITSI2C Interface Timing (Note 5)fSCL(MAX

Page 31 - PACKAGE DESCRIPTION

LTC4261/LTC4261-2642612fdFor more information www.linear.com/LTC4261Shunt Regulator Voltage vs Input CurrentShunt Regulator Voltage vs TemperatureINTV

Page 32

LTC4261/LTC4261-2742612fdFor more information www.linear.com/LTC4261OV Threshold vs TemperatureOV Hysteresis vs TemperatureCurrent Limit Voltage vs Te

Page 33 - REVISION HISTORY

LTC4261/LTC4261-2842612fdFor more information www.linear.com/LTC4261ADIN (Pin 23/Pin 16): ADC Input. A voltage between 0V and 2.56V applied to this pi

Page 34 - RELATED PARTS

LTC4261/LTC4261-2942612fdFor more information www.linear.com/LTC4261PGI (Pin 1/Pin 22): Power Good Input. This pin along with the PGI check timer serv

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