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LTC3351 Datasheet

Hot Swappable Supercapacitor Charger / Backup Controller and System Monitor

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LTC3351
Hot Swappable Supercapacitor Charger,
Backup Controller and System Monitor
FEATURES
nn Integrated Hot Swap Controller with Circuit Breaker
nn High Efficiency Synchronous Step-Down CC/CV
Charging of One to Four Series Supercapacitors
nn Step-Up Mode in Backup Provides Greater
Utilization of Stored Energy in Supercapacitors
nn 16-Bit ADC for Monitoring System Voltages/
Currents, Capacitance and ESR
nn Programmable Undervoltage and Overvoltage
Thresholds to 35V
nn VIN: 4.5V to 35V, VCAP(n): Up to 5V per Capacitor,
Charge/Backup Current: >10A
nn Programmable Input Current Limit Prioritizes System
Load Over Capacitor Charge Current
nn All N-FET Charger Controller and PowerPath Controller
nn Compact 44-Lead 4mm x 7mm QFN Package
APPLICATIONS
nn Swappable PCIe cards with NVM
nn High Current 12V Ride-Through UPS
nn Servers/Mass Storage/High Availability Systems
DESCRIPTION
The LTC®3351 is a backup power controller that charges
and monitors a series stack of one to four supercapacitors.
The LTC3351’s synchronous step-down controller drives
N-channel MOSFETs for constant current/constant voltage
charging with programmable input current limit. In addi-
tion, the step-down converter runs in reverse as a step-up
converter to deliver power from the supercapacitor stack
to the backup supply rail. Internal balancers eliminate the
need for external balance resistors and each capacitor has
a shunt regulator for overvoltage protection.
The LTC3351 monitors system voltages, currents, stack
capacitance and ESR which can all be read over the I2C/
SMBus port. The hot swap controller uses N-channel
MOSFETs for inrush control and a low loss path from the
input to the output. The ideal diode controller uses an
N-channel MOSFET for a low loss power path from the
supercapacitors to the output. The LTC3351 is available
in a thermally enhanced low profile 44-lead 4mm x 7mm
x 0.75mm QFN surface mount package.
All registered trademarks and trademarks are the property of their respective owners. Patents
pending.
TYPICAL APPLICATION
ICHG (STEP-DOWN)
VIN
HS_GATE
UV
ISNSP_HS/ ISNSM
ISNSP_CHG OUTFB
OV
OUTFET
TGATE
LTC3351
SW
BGATE
ICAP
VCAP
I2C CAP4
CAP3
CAP2
CAP1
CAPRTN
CAPFB
IBACKUP
VOUT
VCAP < VOUT
(STEP-UP)
VCAP > VOUT
(DIRECT
CONNECT)
10F VCAP
10F
10F
10F
3351 TA01a
VIN
2V/DIV
Example Hot Swap from 12V
VOUT
2V/DIV
IIN
0.2A/DIV
5ms/DIV
3351 TA01
For more information www.linear.com/LTC3351
3351f
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC3351 Datasheet

Hot Swappable Supercapacitor Charger / Backup Controller and System Monitor

No Preview Available !

LTC3351
TABLE OF CONTENTS
Features............................................................................................................................. 1
Applications........................................................................................................................ 1
Typical Application ................................................................................................................ 1
Description......................................................................................................................... 1
Absolute Maximum Ratings...................................................................................................... 3
Order Information.................................................................................................................. 3
Pin Configuration.................................................................................................................. 3
Electrical Characteristics......................................................................................................... 4
Typical Performance Characteristics........................................................................................... 8
Pin Functions......................................................................................................................10
Block Diagram.....................................................................................................................13
Timing Diagram...................................................................................................................14
Operation.......................................................................................................................... 15
Applications Information........................................................................................................26
Register Map......................................................................................................................43
Package Description.............................................................................................................55
Typical Application...............................................................................................................56
Related Parts......................................................................................................................56
3351f
2 For more information www.linear.com/LTC3351


Part Number LTC3351
Description Hot Swappable Supercapacitor Charger / Backup Controller and System Monitor
Maker Analog Devices
Total Page 30 Pages
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