OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

LTC2925IUF#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
LTC2925
1
2925fd
For more information www.linear.com/LTC2925
Typical applicaTion
FeaTures
applicaTions
DescripTion
Multiple Power Supply
Tracking Controller with
Power Good Timeout
n
V
CORE
and V
I/O
Supply Tracking
n
Microprocessor, DSP and FPGA Supplies
n
Servers
n
Communication Systems
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
n
Flexible Power Supply Tracking Up and Down
n
Power Supply Sequencing
n
Supply Stability Is Not Affected
n
Controls Three Supplies Without Series FETs
n
Controls an Optional Fourth Supply with a
Series FET
n
Electronic Circuit Breaker
n
Remote Sense Switch Compensates for Voltage
Drop Across a Series FET
n
Supply Shutdown Outputs
n
FAULT Output
n
Adjustable Power Good Timeout
n
Available in Narrow 24-Lead SSOP and Tiny 24-Lead
QFN Packages
The LTC
®
2925 provides a simple solution to power supply
tracking and sequencing requirements. By selecting a few
resistors, the supplies can be configured to ramp-up and
ramp-down together or with voltage offsets, time delays
or different ramp rates.
The LTC2925 controls the outputs of three independent
supplies without inserting any pass element losses. For
systems that require a fourth supply, or when a supply
does not allow direct access to its feedback resistors, one
supply can be controlled with a series FET. When the FET
is used, an internal remote sense switch compensates for
the voltage drop across the FET and current sense resistor,
and an electronic circuit breaker provides protection from
short-circuit conditions.
The LTC2925 also includes a power good timeout feature
that turns off the supplies if an external supply monitor
fails to indicate that the supplies have entered regulation
within an adjustable timeout period.
0.015Ω Si4412ADY
0.1µF
0.1µF
0.82µF
10k
V
CC
SENSEP SENSEN
3.3V
V
IN
3.3V
138k
3.3V V
IN
1.65k
88.7k
41.2k
2.5V
SLAVE2
MASTER
88.7k
41.2k
86.6k
100k
13k
100k
RAMPBUF
TRACK1
TRACK2
TRACK3
FB2
GATE
LTC2925
PGTMR
0.082µF
SDTMR
0.47µF
SCTMR
GND
2925 TA01
RAMP
100k
1.5V
SLAVE3
86.6k
DC/DC
IN
FB = 0.8V OUT
DC/DC
IN
FB = 0.8V
RUN/SS
RUN/SS
OUT
FB3
SD3
SD2
3.3V
PGI
35.7k
10Ω
1.8V
SLAVE1
16.5k
SUPPLY
MONITOR
DC/DC
IN
FB = 1.235V
RUN/SS
OUT
FB1
SD1
FAULT
ON
10k
V
IN
STATUS
REMOTE
RST
1V/DIV
3.3V
2.5V
1.8V
1.5V
10ms/DIV
2925 TA02a
1V/DIV
3.3V
2.5V
1.8V
1.5V
10ms/DIV
2925 TA02b
LTC2925
2
2925fd
For more information www.linear.com/LTC2925
absoluTe MaxiMuM raTings
(Notes 1, 2)
1
2
3
4
5
6
7
8
9
10
11
12
TOP VIEW
GN PACKAGE
24-LEAD PLASTIC SSOP
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
SENSEP
SENSEN
ON
SDTMR
SD1
SD2
SD3
RAMPBUF
GND
FB3
TRACK3
SCTMR
PGTMR
PGI
STATUS
FAULT
GATE
RAMP
REMOTE
FB1
TRACK1
TRACK2
FB2
T
JMAX
= 125°C, θ
JA
= 85°C/W
24 23 22 21 20 19
7 8 9
TOP VIEW
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
EXPOSED PAD (PIN 25)
PCB GND CONNECTION OPTIONAL
10 11 12
6
5
4
3
2
1
13
14
15
16
17
18
25
ON
SDTMR
SD1
SD2
SD3
RAMPBUF
SENSEN
SENSEP
V
CC
SCTMR
PGTMR
PGI
GND
FB3
TRACK3
FB2
TRACK2
TRACK1
STATUS
FAULT
GATE
RAMP
REMOTE
FB1
T
JMAX
= 125°C, θ
JA
= 37°C/W
pin conFiguraTion
orDer inForMaTion
TUBE TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2925CGN#PBF LTC2925CGN#TRPBF LTC2925CGN 24-Lead Plastic SSOP 0°C to 70°C
LTC2925IGN#PBF LTC2925IGN#TRPBF LTC2925IGN 24-Lead Plastic SSOP –40°C to 85°C
LTC2925CUF#PBF LTC2925CUF#TRPBF 2925 24-Lead (4mm × 4mm) Plastic QFN 0°C to 70°C
LTC2925IUF#PBF LTC2925IUF#TRPBF 2925 24-Lead (4mm × 4mm) Plastic QFN –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
Supply Voltage (V
CC
) ................................. –0.3V to 10V
Input Voltages
ON, PGI, SENSEP, SENSEN ................... –0.3V to 10V
TRACK1, TRACK2, TRACK3 .........–0.3V to V
CC
+ 0.3V
SCTMR, SDTMR, PGTMR ............–0.3V to V
CC
+ 0.3V
Output Voltages
FAULT, SD1, SD2, SD3,
FB1, FB2, FB3, STATUS .......................... –0.3V to 10V
RAMPBUF, REMOTE ....................–0.3V to V
CC
+ 0.3V
RAMP .............................................–0.3V to V
CC
+ 1V
GATE (Note 3) ...................................... –0.3V to 11.5V
Average Current
TRACK1, TRACK2, TRACK3 .................................5mA
FB1, FB2, FB3.......................................................5mA
Operating Temperature Range
LTC2925C ................................................ 0°C to 70°C
LTC2925I .............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MS Package ......................................................300°C
http://www.linear.com/product/LTC2925#orderinfo
LTC2925
3
2925fd
For more information www.linear.com/LTC2925
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Input Supply Range
l
2.9 5.5 V
I
CC
Input Supply Current I
FBx
= 0, I
TRACKx
= 0, I
RAMPBUF
= 0
l
1.5 3 mA
I
FBx
= –1mA, I
TRACKx
= –1mA,
I
RAMPBUF
= –3mA
l
10.5 15 mA
V
CC(UVL)
Input Supply Undervoltage Lockout V
CC
Rising
l
2.3 2.5 2.7 V
∆V
CC(UVL, HYST)
Input Supply Undervoltage Lockout Hysteresis 25 mV
∆V
GATE
External N-Channel Gate Drive (V
GATE
– V
CC
) I
GATE
= –1µA
l
5 5.5 6 V
I
GATE
GATE Pin Current Gate On, V
GATE
= 0V, No Faults
l
–7 –10 –13 µA
Gate Off, V
GATE
= 5V, No Faults
l
7 10 13 µA
Gate Off, V
GATE
= 5V, Short-Circuit or
Power Good Timeout
l
5 20 50 mA
V
ON(TH)
ON Pin Threshold Voltage V
ON
Rising
l
1.214 1.232 1.250 V
∆V
ON(HYST)
ON Pin Hysteresis
l
30 75 150 mV
V
ON(FC)
ON Pin Fault Clear Threshold Voltage
l
0.3 0.4 0.5 V
I
ON(IN)
ON Pin Input Current V
ON
= 1.2V, V
CC
= 5.5V
l
0 ±100 nA
∆V
RS-SENSE(TH)
Sense Resistor Overcurrent Voltage Threshold
(V
SENSEP
– V
SENSEN
)
1V < V
SENSEP
< V
CC
0V < V
SENSEP
< 1V
l
l
40
30
50
50
60
70
mV
mV
I
SENSEN
SENSEN Pin Input Current 0V < V
SENSEN
< V
CC
l
–1 5 10 µA
I
SENSEP
SENSEP Pin Input Current 0V < V
SENSEP
< V
CC
l
–1 5 10 µA
V
OS
Ramp Buffer Offset (V
RAMPBUF
– V
RAMP
) V
RAMPBUF
= V
CC
/2, I
RAMPBUF
= 0A
l
–30 0 30 mV
V
FAULT(OL)
FAULT Output Low Voltage I
FAULT
= 3mA
l
0.2 0.4 V
V
SDx(OL)
SDx Output Low Voltage I
SDx
= 1mA, V
CC
= 2.3
l
0.2 0.4 V
V
STATUS(OL)
STATUS Output Low Voltage I
STATUS
= 3mA
l
0.2 0.4 V
I
RAMP
RAMP Pin Input Current 0V < RAMP < V
CC
, V
CC
= 5.5V
l
0 ±1 µA
V
RAMPBUF(OL)
RAMPBUF Low Voltage I
RAMPBUF
= 3mA
l
90 150 mV
V
RAMPBUF(OH)
RAMPBUF High Voltage (V
CC
– V
RAMPBUF
) I
RAMPBUF
= –3mA
l
100 200 mV
I
ERROR(%)
I
FBx
to I
TRACKx
Current Mismatch
I
ERROR(%)
= (I
FBx
– I
TRACKx
)/I
TRACKx
I
TRACKx
= –10µA
I
TRACKx
= –1mA
l
l
0
0
±5
±5
%
%
V
TRACKx
TRACK Pin Voltage I
TRACKx
= –10µA
I
TRACKx
= –1mA
l
l
0.78
0.78
0.8
0.8
0.82
0.82
V
V
I
FB(LEAK)
I
FB
Leakage Current V
FB
= 1.5V, V
CC
= 5.5V
l
±10 nA
V
FB(CLAMP)
V
FB
Clamp Voltage 1µA < I
FB
< 1mA
l
1.6 2.1 2.5 V
R
REMOTE
REMOTE Feedback Switch Resistance 2V < V
REMOTE
< V
CC
l
15 30 Ω
I
SCTMR(UP)
Short-Circuit Timer Pull-Up Current V
SCTMR
= 1V
l
–35 –50 –65 µA
I
SCTMR(DN)
Short-Circuit Timer Pull-Down Current V
SCTMR
= 1V
l
1 2 3 µA
V
SCTMR(TH)
Short-Circuit Timer Threshold Voltage
l
1.1 1.23 1.4 V
I
SDTMR(UP)
Shutdown Timer Pull-Up Current V
SDTMR
= 1V
l
–7 –10 –13 µA
V
SDTMR(TH)
Shutdown Timer Threshold Voltage
l
1.1 1.23 1.4 V
I
PGI(UP)
Power Good Input Pull-Up Current V
PGI
= 0V
l
–5 –10 –15 µA
V
PGI(TH)
Power Good Input Threshold Voltage
l
0.8 1.4 V
I
PGTMR(UP)
Power Good Timer Pull-Up Current V
PGTMR
= 1V
l
–8 –10 –14 µA
V
PGTMR(TH)
Power Good Timer Threshold Voltage
l
1.1 1.23 1.4 V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26

LTC2925IUF#PBF

Mfr. #:
Buy LTC2925IUF#PBF
Manufacturer:
Analog Devices Inc.
Description:
Power Management Specialized - PMIC Pwr Supply Sequence/Tracking Controller
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet