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LTC2928IUHF#PBF

Description
Processor Supervisor 5V 4 38-Pin QFN EP Tube
File Size498KB,34 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric View All

LTC2928IUHF#PBF Overview

Processor Supervisor 5V 4 38-Pin QFN EP Tube

LTC2928IUHF#PBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
Number of Supervisors4
Minimum Reset Threshold Voltage (V)0.4925
Typical Reset Threshold Voltage (V)5
Maximum Reset Threshold Voltage (V)0.5075
Minimum Operating Supply Voltage (V)2.9
Maximum Operating Supply Voltage (V)16.5
Maximum Supply Current (uA)2500
Power Fail DetectionNo
Watchdog TimerNo
Manual ResetNo
Chip Enable SignalsNo
Battery Backup SwitchingNo
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeIndustrial
PackagingTube
TypePower Supply Sequencer
Pin Count38
Standard Package NameQFN
Supplier PackageQFN EP
MountingSurface Mount
Package Height0.75(Max)
Package Length7
Package Width5
PCB changed38
Lead ShapeNo Lead
FEATURES
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LTC2928
Multichannel Power Supply
Sequencer and Supervisor
DESCRIPTION
The
LTC
®
2928
is a four channel cascadable power
supply sequencer and high accuracy supervisor. Sequenc-
ing thresholds, order and timing are configured with just a
few external components, negating the need for PC board
layout or software changes during system development.
Multiple LTC2928s may be easily connected to sequence
an unlimited number of power supplies.
Sequence outputs control supply enable pins or
N-channel pass gates. Precision input comparators with
individual outputs monitor power supply voltages to 1.5%
accuracy. Supervisory functions include undervoltage
and overvoltage monitoring and reporting as well as
µP
reset generation.
RST
may be forced high to complement
margin testing.
Application faults, whether internally or externally gener-
ated, can shut down all controlled supplies. The type and
source of faults are reported for diagnosis. Individual
channel controls are available to independently exercise
enable outputs and supervisory functions.
A high voltage input allows the LTC2928 to be powered
from voltages as high as 16.5V. A buffered reference
output permits single negative power supply sequencing
and monitoring operations.
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Easily Configure Power Management
without Software
Controls Up to Four Supplies per Device
Cascades for Additional Supplies
Staged Supply Sequencing with
Adjustable Time Positions
Fault Event Reporting with Diagnostics
Selectable System Shutdown on Fault
1.5% Undervoltage Monitor Accuracy
Overvoltage and/or Fault Indication
Configurable Undervoltage and
Overvoltage Thresholds
Charge Pumped Enable Pins Drive N-Channel MOSFETs
Operates from 2.9V to 16.5V
5mm
×
7mm 38-lead QFN and
36-lead SSOP Packages
APPLICATIONS
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Network/Telecom Infrastructure
Sequencing for Multiple I/O and Core Voltages
Power Management
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. patents, including 4843302, 6949965.
TYPICAL APPLICATION
12V
LTM4600
V
IN
V
OUT
RUN
10k
V
IN
LTC3414
V
OUT
3.3V
1.2V
LTC1628
V
IN
V
OUT
RUN
AUSTIN LYNX
V
IN
V
OUT
AXA010AY93
0.1µF
ON
95.3k
24.3k
9.53k
1.5k
3.4k
RUN
2.5V
Sequencing Up and Down
3.3V
2.5V
1.8V
1.2V
Si7894ADP
1.8V
12.1k
23.2k
36.5k
51.1k
1V/DIV
ON
100
HV
CC
EN2
EN1 EN4
EN3
1µF
ON
RT1
RT2
RT3
RT4
DONE
V
CC
GND MS1 VSEL
V1
V2
V3
LTC2928
V4
RST
OV
FLT
RTMR PTMR STMR
0.047µF
3300pF
10k
10k
10k
10k
DONE
SYSTEM
RESET
FAULT
START
SEQUENCE SEQUENCE UP
START
UP COMPLETE
SEQUENCE
DOWN
SEQUENCE
DOWN
COMPLETE
2928 TA07
ALL RESISTORS 1%
2928 TA06
Document Feedback
For more information
www.analog.com
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