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LTC2921IGN-2.5#PBF

Description
Power Supply Tracker w/3 FB Switches
CategoryPower/power management    The power supply circuit   
File Size310KB,20 Pages
ManufacturerADI
Websitehttps://www.analog.com
Environmental Compliance
Download Datasheet Parametric View All

LTC2921IGN-2.5#PBF Overview

Power Supply Tracker w/3 FB Switches

LTC2921IGN-2.5#PBF Parametric

Parameter NameAttribute value
Brand NameAnalog Devices Inc
Is it lead-free?Contains lead
Is it Rohs certified?conform to
MakerADI
package instructionSSOP,
Contacts16
Manufacturer packaging code05-08-1641 (GN16)
Reach Compliance Codecompliant
Adjustable thresholdYES
Analog Integrated Circuits - Other TypesPOWER SUPPLY SUPPORT CIRCUIT
JESD-30 codeR-PDSO-G16
JESD-609 codee3
length4.8895 mm
Humidity sensitivity level1
Number of channels4
Number of functions1
Number of terminals16
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Package body materialPLASTIC/EPOXY
encapsulated codeSSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
Maximum seat height1.727 mm
Maximum supply voltage (Vsup)2.63 V
Minimum supply voltage (Vsup)2.37 V
Nominal supply voltage (Vsup)2.5 V
surface mountYES
Temperature levelINDUSTRIAL
Terminal surfaceMATTE TIN
Terminal formGULL WING
Terminal pitch0.635 mm
Terminal locationDUAL
Maximum time at peak reflow temperature30
width3.9 mm
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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