LINEAR TECHNOLOGY LTC4260 User's Guide
Summary
The LTC4260 is a robust high-voltage hot swap controller essential for reliable power delivery in server and computer applications. It enables safe board insertion and removal from live backplanes by monitoring critical parameters like voltage, current, and fault status via an 8-Bit ADC. Featuring wide operating voltages (8.5V–80V), adjustable ramping, and advanced protections—including over/undervoltage monitoring and foldback limiting—this controller ensures system integrity even during unexpected power events. This manual provides deep technical details for developers building mission-critical rack-resident systems.
Page 1 Text Content
LTC4260
CO NN EC TO Positive High Voltage
Hot Swap Controller with
CO NN EC TO
I2C Compatible Monitoring
FEATURES DESCRIPTIO Allows Safe Insertion into Live Backplane The LTC®4260 Hot Swap TM controller allows a board to be 8-Bit ADC Monitors Current and Voltage safely inserted and removed from a live backplane. Using I2CTM/SMBus Interface an external N-channel pass transistor, the board supply Wide Operating Voltage Range: 8.5V to 80V voltage can be ramped up at an adjustable rate. An I2C High Side Drive for External N-Channel MOSFET interface and onboard ADC allow monitoring of board Input Overvoltage/Undervoltage Protection current, voltage and fault status. Optional Latchoff or Autoretry After Faults
The device features adjustable analog foldback current
Alerts Host After Faults
limit with latch off or automatic restart after the LTC4260
Foldback Current Limiting
remains in current limit beyond an adjustable time-out
Available in 24-Lead SO, 24-Lead Narrow
delay.
SSOP and 32-Lead (5mm × 5mm) QFN Packages
The controller has additional features to interrupt the host when a fault has occurred, notify when output power is
APPLICATIO S
good, detect insertion of a load card and power-up in either Electronic Circuit Breakers the on or off state. Live Board Insertion , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation.
Computers, Servers All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
Power Up Waveforms3A, 48V Card Resident Application
FDB36320.010Ω VOUT
48V CL = 1000µF
CL VIN 43.5k
49.9k 50V/DIV
IIN 3.57k 2A/DIV
UV VDD SENSE GATE SOURCE VOUT
2.67k* OV FB 50V/DIV
BD_PRST
SDA SDAI LTC4260 SCL SCL GPIO
ALERT ALERT 5V/DIV
ON GPIO INTVCC TIMER GND
4260 TA01
4260 TA02
0.1µF 68n F 25ms/DIV
BACKPLANE PLUG-IN
*DIODES INC. SMBT70A
4260fa
Page Summary Contents For LINEAR TECHNOLOGY LTC4260 User's Guide
Manual Details
| Brand | Linear |
|---|---|
| Pages | 28 |
| File Size | 305.71 KB |
| Published | June 16, 2026 |
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Frequently Asked Questions
Which packages are available for this controller?
The LTC4260 is available in multiple packages including 24-Lead SO, 24-Lead Narrow delay SSOP, and 32-Lead (5mm × 5mm) QFN.