LINEAR TECHNOLOGY LTC1645 User Guide Manual
Summary
The LTC1645 is a robust dual-channel Hot Swap Controller designed to ensure safe board insertion and removal from live backplanes. This advanced power sequencer provides programmable supply voltage ramping for supplies ranging from 1.2V up to 12V, managing system power-up and power-down rates precisely using external N-channel FETs. The accompanying manual details critical features, including Undervoltage Lockout (UVLO), electronic circuit protection, and glitch filtering, making it ideal for engineers building reliable embedded systems requiring meticulous power management during operation.
Page 1 Text Content
LTC1645
CO NN EC TO
Dual-Channel Hot Swap
CO NN EC TO
Controller/Power Sequencer
FEATURES DESCRIPTIO
Allows Safe Board Insertion and Removal from a The LTC®1645 is a 2-channel Hot Swap TM controller that Live Backplane allows a board to be safely inserted and removed from a Programmable Power Supply Sequencing live backplane. Using external N-channel pass transistors, Programmable Electronic Circuit Breaker the supply voltages can be ramped at a programmable User-Programmable Supply Voltage Power-Up and rate. Two high side switch drivers control the N-channel Power-Down Rate gates for supply voltages ranging from 1.2V to 12V. The High Side Drivers for External N-Channel FETs two channels can be set to ramp up and down separately, Controls Supply Voltages from 1.2V to 12V or they can be programmed to rise and fall simultaneously, Ensures Proper Power-Up Behavior ensuring power supply tracking at the two outputs.
Undervoltage Lockout
Programmable electronic circuit breakers protect against
Glitch Filter Protects Against Spurious RESET Signals
shorts at either output. The RESET output can be used to
8- and 14-Pin SO Packages
generate a system reset when a supply voltage falls below a user-programmed voltage. An additional spare com-
APPLICATIO S
parator is available for monitoring a second supply voltage.
Hot Board Insertion
Power Supply Sequencing The LTC1645 is available in the 8- and 14-pin SO packages. Electronic Circuit Breaker , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
5V and 3.3V Hot Swap 5V and 3.3V Hot Swap Waveforms
IRF74130.005Ω* VOUT2 VIN2 3.3V 5A CLOAD2
ON VOUT1 5V/DIV
0.005Ω* IRF7413
VIN1 5V 5A 10Ω CLOAD1
GATEn
10V/DIV
VOUT2 5V/DIV
SENSE1 VCC2GATE1 SENSE2 GATE2
VOUT1
LTC1645 5V/DIV (8-LEAD)
ON ON
1645 TA01
PLUG-IN CARDBACKPLANE *LRF1206-01-R005-J (IRC)
1645fa
Page Summary Contents For LINEAR TECHNOLOGY LTC1645 User Guide Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 24 |
| File Size | 325.03 KB |
| Published | June 01, 2026 |
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Frequently Asked Questions
What does the LTC1645 control?
It is a 2-channel Hot Swap controller that controls supply voltages ranging from 1.2V to 12V.
How does this device ensure safe board insertion/removal?
It allows for safe connection and disconnection of a board from a live backplane using external N-channel pass transistors.
What protection features are included in the LTC1645?
Features include Undervoltage Lockout, proper power-up behavior checks, Glitch Filter protection against spurious signals, and programmable circuit breakers.
Can I customize the power sequencing rates?
Yes, the supply voltages can be programmed to ramp up and down at a programmable rate using two dedicated high side switch drivers.