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LTC2921CGN-3.3#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LTC2921/LTC2922 Series
1
29212fa
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
2921/22 TA01
100Ω
10Ω
LTC2921
V
CC
SENSE
100Ω
100Ω
4.7k
49.9k
49.9k
169k
243k
V
OUT
V
FB
V
OUT
V
FB
V
OUT
V
FB
10Ω
10Ω
V1
V2
V3
V4
GATE
PG
GND TIMER
Si1012R
CBRST
5V SUPPLY
3.3V SUPPLY
2.5V SUPPLY
Si2316DS
Si2316DS
Si2316DS
WSL1206
0.05Ω
0.22µF
5V
LOAD
3.3V
LOAD
2.5V
LOAD
RESET
0.47µF
DC/DC
CONVERTER
DC/DC
CONVERTER
DC/DC
CONVERTER
100k
D1
D2
D3
S1
S2
S3
CIRCUIT BREAKER
RESET CONTROL
t
GATE
~ 500ms
t
TIMER
~ 130ms
■
Desktop Computers
■
Plug-In Cards
■
Telecom Infrastructure
■
Supply Sequencing
■
Instruments
■
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)
Power Supply Tracker
with Input Monitors
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.
Three-Supply Tracker and Monitor (5V, 3.3V, 2.5V)
Load Voltage Ramp-Up and
Power-Good Activation
2921/22 TA01b
2.5V SUPPLY
2V/DIV
PG
2V/DIV
5V LOAD
3.3V LOAD
2.5V LOAD
5V SUPPLY AT 5V
3.3V SUPPLY AT 3.3V
100ms/DIV
OUTPUTS
2V/DIV
LTC2921/LTC2922 Series
2
29212fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply Pin
V
CC
Supply Voltage Typical Operating Range
LTC2921/LTC2922 4.50 5.00 5.50 V
LTC2921-3.3/LTC2922-3.3 2.97 3.30 3.63 V
LTC2921-2.5/LTC2922-2.5 2.37 2.50 2.63 V
I
CC
Supply Current 2mA
V
CC(MON)
Supply Monitor Threshold Voltage LTC2921/LTC2922 ● 4.285 4.350 4.415 V
LTC2921-3.3/LTC2922-3.3
● 2.828 2.871 2.914 V
LTC2921-2.5/LTC2922-2.5 ● 2.265 2.300 2.335 V
V
CC(OV)
Supply Overvoltage Threshold LTC2921/LTC2922 ● 5.82 6.13 6.43 V
LTC2921-3.3/LTC2922-3.3 ● 3.84 4.04 4.24 V
LTC2921-2.5/LTC2922-2.5
● 3.08 3.24 3.40 V
V
CC
Supply Voltage......................................–0.3V to 7V
V1, V2, V3, V4 Voltages............................... –0.3V to 7V
SENSE Voltage ............................................–0.3V to 7V
TIMER Voltage............................. –0.3V to (V
CC
+ 0.3V)
Charge Pumped Output Voltages
GATE, PG............................................ –0.3V to 12.2V
Switch Voltages
S0, D0, S4, D4 (LTC2922 Series) ............–0.3V to 7V
S1, D1, S2, D2, S3, D3 ............................–0.3V to 7V
ORDER PART
NUMBER
T
JMAX
= 125°C, θ
JA
= 110°C/W
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
ELECTRICAL CHARACTERISTICS
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Switch Currents (DC, RMS)
S0, D0, S4, D4 (LTC2922 Series) ..................... 30mA
S1, D1, S2, D2, S3, D3 ..................................... 30mA
Operating Ambient Temperature Range
LTC2921C/LTC2922C .............................. 0°C to 70°C
LTC2921I/LTC2922I ............................–40°C to 85°C
Junction Temperature (Note 2).............................125°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
LTC2922CF
LTC2922CF-3.3
LTC2922CF-2.5
LTC2922IF
LTC2922IF-3.3
LTC2922IF-2.5
T
JMAX
= 125°C, θ
JA
= 90°C/W
TOP VIEW
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V1
V2
V3
V4
S3
D3
S2
D2
TIMER
V
CC
SENSE
GATE
PG
GND
D1
S1
1
2
3
4
5
6
7
8
9
10
TOP VIEW
20
19
18
17
16
15
14
13
12
11
SO
TIMER
V1
V2
V3
V4
S4
D4
S3
D3
D0
V
CC
SENSE
GATE
PG
GND
D1
S1
D2
S2
F PACKAGE
20-LEAD PLASTIC TSSOP
LTC2921CGN
LTC2921CGN-3.3
LTC2921CGN-2.5
LTC2921IGN
LTC2921IGN-3.3
LTC2921IGN-2.5
GN PART MARKING
2921
292133
292125
2921I
921I33
921I25
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V for LTC2921/LTC2922, V
CC
= 3.3V for
LTC2921-3.3/LTC2922-3.3, and V
CC
= 2.5V for LTC2921-2.5/LTC2922-2.5, unless otherwise noted.
LTC2921/LTC2922 Series
3
29212fa
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V for LTC2921/LTC2922, V
CC
= 3.3V for
LTC2921-3.3/LTC2922-3.3, and V
CC
= 2.5V for LTC2921-2.5/LTC2922-2.5, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
as follows:
LTC2921 Series: T
J
= T
A
+ (P
D
• 110°C/W)
LTC2922 Series: T
J
= T
A
+ (P
D
• 90°C/W)
Note 3: This specification applies to all switches, and is measured with
V
S
< V
D
.
Note 4: The PG pin will rise to approximately the same voltage as the
GATE pin when not pulled up or pulled down by external resistance.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC(UVLO)
Supply Undervoltage Lockout V
CC
Rising ● 2.08 2.20 2.30 V
V
CC(UVH)
Supply Undervoltage Hysteresis V
CC
Falling 120 mV
Electronic Circuit Breaker
∆V
SENSE
Circuit Breaker Trip Voltage ∆V
SENSE
= V
CC
- V
SENSE
● 45 50 55 mV
I
SENSE
SENSE Pin Input Current 150 500 nA
t
V1(DLY)
Circuit Breaker Trip Delay Time V
CC
- V
SENSE
= 150mV
LTC2921/LTC2922 0.5 1.5 3.0 µs
LTC2921-3.3/LTC2922-3.3 0.5 1.5 3.0 µs
LTC2921-2.5/LTC2922-2.5 0.5 1.5 6.0 µs
t
V1(RST)
Circuit Breaker Reset Pulse Width Guaranteed Not to Reset ● 50 µs
Guaranteed to Reset
● 150 µs
V
V1(RST)
Circuit Breaker Reset Threshold Voltage ● 0.490 0.500 0.510 V
Monitor Inputs
V
MON
V1-V4 Monitor Threshold Voltages 0.495 0.500 0.505 V
● 0.492 0.500 0.508 V
V
OV
V1-V4 Overvoltage Thresholds ● 0.665 0.700 0.735 V
I
MON
V1-V4 Input Currents ±0.1 µA
TIMER Pin
V
TIMER(TH)
TIMER Ramp Threshold Voltage ● 1.15 1.20 1.25 V
I
TIMER(PU)
TIMER Pull-Up Current V
TIMER
= 1V ● –1.3 –2.0 –2.5 µA
I
TIMER(PD)
TIMER Pull-Down Current V
CC
= 2.35V, V
TIMER
= 0.4V 100 µA
V
TIMER(CLR)
TIMER Cleared Threshold Voltage V
TIMER
Falling 150 250 mV
GATE Pin
V
GATE
GATE Drive Output Voltage LTC2921/LTC2922 ● 10.0 11.1 12.2 V
LTC2921-3.3/LTC2922-3.3
● 8.4 9.1 9.8 V
LTC2921-2.5/LTC2922-2.5
● 6.1 6.8 7.5 V
I
GATE(PU)
GATE Pull-Up Current V
GATE
= V
CC
● –6.5 –10.0 –12.5 µA
I
GATE(PD)
GATE Pull-Down Current V
CC
= 2.35V, V
GATE
= 2.35V 10 mA
Remote Sense Switches
R
DS(FB)
Feedback Switch Resistances (Note 3) V
D
= V
CC
● 210 Ω
PG Pin
I
PG(PU)
PG Pull-Up Current V
PG
= V
CC
● –2.6 –4.0 –5.0 µA
I
PG(PD)
PG Pull-Down Current V
CC
= 2.35V, V
PG
= 2.35V 10 mA
V
PG(OL)
PG Output Low Voltage V
CC
= 2.35V, I
PG
= 5mA ● 0.4 V
V
PG
PG Output Voltage (Note 4) LTC2921/LTC2922 ● 10.0 11.1 12.2 V
LTC2921-3.3/LTC2922-3.3
● 8.4 9.1 9.8 V
LTC2921-2.5/LTC2922-2.5
● 6.1 6.8 7.5 V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC2921CGN-3.3#TRPBF

Mfr. #:
Buy LTC2921CGN-3.3#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Current & Power Monitors & Regulators Power Supply Tracker w/3 FB Switches
Lifecycle:
New from this manufacturer.
Delivery:
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