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LTC2921CGN-3.3

Description
Processor Supervisor 2.871V 5 16-Pin SSOP N Tube
File Size311KB,20 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Download user manual Parametric View All

LTC2921CGN-3.3 Overview

Processor Supervisor 2.871V 5 16-Pin SSOP N Tube

LTC2921CGN-3.3 Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesNot Compliant
ECCN (US)EAR99
Part StatusUnconfirmed
SVHCYes
SVHC Exceeds ThresholdYes
Number of Supervisors5
Typical Reset Threshold Voltage (V)2.871
Maximum Reset Threshold Voltage (V)4.04
Monitored Voltage (V)2.5|3.3|5
Minimum Operating Supply Voltage (V)2.97
Typical Operating Supply Voltage (V)3.3
Maximum Operating Supply Voltage (V)3.63
Maximum Supply Current (uA)2000(Typ)
Power Fail DetectionNo
Watchdog TimerNo
Manual ResetNo
Chip Enable SignalsNo
Battery Backup SwitchingNo
Minimum Operating Temperature (°C)0
Maximum Operating Temperature (°C)70
Supplier Temperature GradeCommercial
PackagingTube
TypePower Supply Tracker
Pin Count16
Standard Package NameSOP
Supplier PackageSSOP N
MountingSurface Mount
Package Height1.5(Max)
Package Length4.98(Max)
Package Width3.99(Max)
PCB changed16
Lead ShapeGull-wing
LTC2921/LTC2922 Series
Power Supply Tracker
with Input Monitors
FEATURES
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Tracks Multiple Supplies with MOSFET Switches
Monitors 5 Input Voltages Including V
CC
Guaranteed Threshold Accuracy:
±1%
at 0.5V
Automatic Remote Sense Switching
Adjustable Supply Ramp Rate
Overvoltage Monitor
Adjustable Electronic Circuit Breaker
Adjustable Power-Good Delay
Available for V
CC
Supply Voltages of 5V, 3.3V and 2.5V
Available in 16-Pin Narrow SSOP (LTC2921 Series)
and 20-Pin TSSOP (LTC2922 Series)
The LTC
®
2921 and LTC2922 monitor up to five supplies
and force them to track on power-up in multiple supply
systems. Using external N-channel pass transistors, the
supplies can be ramped up at an adjustable rate. Auto-
matic remote sense switching allows the DC/DC convert-
ers to compensate for series voltage drops in the wiring.
An incorrect level on one or more of the supplies triggers
disconnect of all supplies. Tight 1% accuracy and glitch
immunity on the low 0.5V monitoring level ensure no false
error disconnects.
The LTC2921 and LTC2922 each feature an adjustable
electronic circuit breaker to protect the V
CC
supply against
short circuits. Capacitance at the TIMER pin programs the
delays in the monitoring sequence.
The LTC2921 includes three remote sense switches in a
16-pin narrow SSOP package, while the LTC2922 includes
five remote sense switches in a 20-pin TSSOP package.
Both parts are available for V
CC
supply voltages of 5V,
3.3V, and 2.5V.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
Desktop Computers
Plug-In Cards
Telecom Infrastructure
Supply Sequencing
Instruments
TYPICAL APPLICATIO
V
OUT
V
FB
DC/DC
CONVERTER
V
OUT
V
FB
DC/DC
CONVERTER
V
OUT
V
FB
DC/DC
CONVERTER
243k
169k
2.5V SUPPLY
100Ω
3.3V SUPPLY
100Ω
5V SUPPLY
100Ω
Three-Supply Tracker and Monitor (5V, 3.3V, 2.5V)
WSL1206
0.05Ω
Si2316DS
10Ω
3.3V
LOAD
5V
LOAD
Si2316DS
10Ω
2.5V SUPPLY
2V/DIV
5V LOAD
3.3V LOAD
OUTPUTS
2V/DIV
2.5V LOAD
Si2316DS
10Ω
2.5V
LOAD
V
CC
V1
V2
V3
V4
S1
S2
S3
GND
CIRCUIT BREAKER
RESET CONTROL
SENSE
GATE
0.47µF
PG
D1
D2
D3
TIMER
0.22µF
4.7k
PG
2V/DIV
49.9k
Si1012R
CBRST
100k
49.9k
LTC2921
RESET
t
GATE
~ 500ms
t
TIMER
~ 130ms
2921/22 TA01
U
Load Voltage Ramp-Up and
Power-Good Activation
100ms/DIV
5V SUPPLY AT 5V
3.3V SUPPLY AT 3.3V
2921/22 TA01b
U
U
29212fa
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