Datasheet Linear Technology LTC1728-3.3

Manufacturer	Linear Technology
Series	LTC1728-3.3

Micropower Precision Triple Supply Monitors in 8-Lead MSOP and 5-Lead SOT-23 Packages

Datasheets

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PDF, 332 Kb, Revision: D, File uploaded: Oct 24, 2017

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Packaging

	LTC1728ES5-3.3#PBF	LTC1728ES5-3.3#TRMPBF	LTC1728ES5-3.3#TRPBF
N	1	2	3
Package	SOT-23 Package Outline Drawing	SOT-23 Package Outline Drawing	SOT-23 Package Outline Drawing
Package Code	S5	S5	S5
Package Index	05-08-1635	05-08-1635	05-08-1635
Pin Count	5	5	5

Parametrics

Parameters / Models	LTC1728ES5-3.3#PBF	LTC1728ES5-3.3#TRMPBF	LTC1728ES5-3.3#TRPBF
Design Tools	LTspice Model	LTspice Model	LTspice Model
Export Control	no	no	no
Features	Supervisor	Supervisor	Supervisor
Isupply, µA	15	15	15
Minimum Reset Level, V	1	1	1
Number of Supplies	3	3	3
Operating Temperature Range, °C	0 to 85	0 to 85	0 to 85
Power Fail Warning	no	no	no
Power Up/Down Reset	yes	yes	yes
Reset Pulse Width	200ms	200ms	200ms
Reset Voltage	3.3V	3.3V	3.3V
Second Reset Voltage	1.8V	1.8V	1.8V
Third Reset Voltage	Adj	Adj	Adj
Threshold Accuracy, %	1.5	1.5	1.5
Vs Max, V	7	7	7
Watchdog Timer	no	no	no

Eco Plan

	LTC1728ES5-3.3#PBF	LTC1728ES5-3.3#TRMPBF	LTC1728ES5-3.3#TRPBF
RoHS	Compliant	Compliant	Compliant

Other Options

LTC1727-2.5 LTC1727-5 LTC1728-1.8 LTC1728-2.5 LTC1728-5

Articles

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Hot Swap Controller with Power-Up Timeout Function Simplifies Hot Swapping Boards with Multiple Power Supplies &mdash LT Journal
PDF, 204 Kb, File published: Dec 1, 2003
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DESIGN FEATURES Hot Swap Controller with
Power-Up Timeout Function
Simplifies Hot Swapping Boards
with Multiple Power Supplies
by Anthony Ng and YK Sim Introduction
The LTC4212 is a Hot Swap controller that allows safe board insertion
and removal from a live backplane.
It features a supply range of 2.5V to
16.5V, programmable soft-start with
inrush current limiting, automatic retry or latched mode operation, a high
side drive for an external N-channel
MOSFET and dual level overcurrent
fault protection.
Unlike many Hot Swap controllers,
the LTC4212 does not monitor the load
side of the MOSFET directly. Instead,
the LTC4212 interfaces with external
power supply monitor ICs or directly
with the PGOOD pin of a switching
regulator. This permits the LTC4212 to
monitor any number of supplies on the
board. It has a power-up timeout function that disconnects a card from the
backplane supply when the monitored …
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Ramp Three Supplies with a Supply Monitor and Hot Swap Controller &mdash LT Journal
PDF, 235 Kb, File published: May 1, 2001
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DESIGN IDEAS Ramp Three Supplies with a Supply
Monitor and Hot Swap Controller
by Mitchell Lee
Many digital systems with multiple
supply voltages require simultaneous
ramping of supplies at power up. Since
the power supply usually consists of
separate regulators for each voltage,
it is impossible to guarantee simultaneity of output. The circuit shown in
Figure 1 ramps the outputs of three
supplies and ensures tracking at
power up and during recovery from a
fault.
Regulators invariably start up at
different rates and different times
based on current capability, filter
capacitance and loop characteristics,
so there are no guarantees as to how
or when the outputs will rise to their
respective voltages. In this case, an
LTC1728-2.5 triple supply monitor
keeps watch over each of three regulated supplies (1.8V, 2.5V and 3.3V).
continued on page 27 Q1 1.8V/15A …

Model Line

Series: LTC1728-3.3 (3)

LTC1728ES5-3.3#PBF LTC1728ES5-3.3#TRMPBF LTC1728ES5-3.3#TRPBF

Manufacturer's Classification

Monitor, Control and Protection > Supervisory Circuits > Triple Supply Monitors
Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) System Monitor