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LTC2928IG#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P34
LTC2928
1
2928fa
For more information www.linear.com/LTC2928
Typical applicaTion
FeaTures DescripTion
Multichannel Power Supply
Sequencer and Supervisor
The LT C
®
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.
applicaTions
L, LT , LT C , LT M , Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 4843302, 6949965.
n
Network/Telecom Infrastructure
n
Sequencing for Multiple I/O and Core Voltages
n
Power Management
n
Easily Configure Power Management
without Software
n
Controls Up to Four Supplies per Device
n
Cascades for Additional Supplies
n
Staged Supply Sequencing with
Adjustable Time Positions
n
Fault Event Reporting with Diagnostics
n
Selectable System Shutdown on Fault
n
1.5% Undervoltage Monitor Accuracy
n
Overvoltage and/or Fault Indication
n
Configurable Undervoltage and
Overvoltage Thresholds
n
Charge Pumped Enable Pins Drive N-Channel MOS-
FETs
n
Operates from 2.9V to 16.5V
n
5mm × 7mm 38-lead QFN and
36-lead SSOP Packages
RT1
RT2
RT3
RT4
V1
12V
ON
10k
V2
V3
V4
LTC2928
ON
10k 10k 10k 10k
FAULT
SYSTEM
RESET
1.8V
2.5V
1.2V
3.3V
12.1k
23.2k
36.5k
51.1k
95.3k
0.047µF 3300pF
0.1µF
100Ω
1µF
24.3k
9.53k
1.5k
3.4k
RST
OV
F LT
DONE
V
CC
2928 TA06
GND MS1 VSEL RTMR PTMR
EN2HV
CC
EN1 EN4 EN3
STMR
V
IN
V
OUT
RUN
LTM4600
V
IN
V
OUT
RUN
LTC3414
V
IN
V
OUT
RUN
LTC1628
V
IN
V
OUT
AUSTIN LYNX
AXA010AY93
ALL RESISTORS 1%
Si7894ADP
3.3V
2.5V
1.8V
1.2V
ON
START
SEQUENCE
UP
START
SEQUENCE
DOWN
SEQUENCE UP
COMPLETE
SEQUENCE
DOWN
COMPLETE
DONE
2928 TA07
1V/DIV
Sequencing Up and Down
LTC2928
2
2928fa
For more information www.linear.com/LTC2928
pin conFiguraTion
absoluTe MaxiMuM raTings
(Note 1)
Supply Voltages
HV
CC
...................................................... –0.3V to 18V
V
CC
........................................................ –0.3V to 6.5V
Input Voltages
V1, V2, V3, V4 .........................................–0.3V to 12V
MS1, MS2, RDIS ................................... –0.3V to 6.5V
SQT1, SQT2, VSEL ............................... –0.3V to 6.5V
RT1, RT2, RT3, RT4 .............................. –0.3V to 6.5V
ON, OVA ......................................... –0.3 to V
CC
+ 0.3V
STMR, PTMR, RTMR .....................–0.3 to V
CC
+ 0.3V
Output Voltages
EN1, EN2, EN3, EN4 (Note 3) ..................–0.3V to 12V
CMP1, CMP2, CMP3, CMP4.................. –0.3V to 6.5V
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
TOP VIEW
G PACKAGE
36-LEAD PLASTIC SSOP
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
CMP1
CMP2
EN2
V2
OVA
EN1
V1
REF
RT1
RT2
RT3
RT4
SQT1
SQT2
MS1
MS2
RDIS
CAS
CMP4
CMP3
V3
EN3
V4
EN4
RTMR
PTMR
STMR
VSEL
GND
HV
CC
V
CC
RST
OV
FLT
DONE
ON
T
JMAX
= 125°C, θ
JA
= 95°C/W
13 14 15 16
TOP VIEW
39
UHF PACKAGE
38-LEAD (5mm × 7mm) PLASTIC QFN
17 18 19
38 37 36 35 34 33 32
24
25
26
27
28
29
30
31
8
7
6
5
4
3
2
1OVA
EN1
V1
N/C
REF
RT1
RT2
RT3
RT4
SQT1
SQT2
MS1
EN3
V4
EN4
RTMR
PTMR
STMR
VSEL
GND
HV
CC
V
CC
RST
OV
V2
EN2
CMP2
CMP1
CMP4
CMP3
V3
MS2
RDIS
CAS
ON
N/C
DONE
FLT
23
22
21
20
9
10
11
12
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 39) PCB GND CONNECTION OPTIONAL
F LT, RST, OV, CAS ................................ –0.3V to 6.5V
DONE, REF ...................................–0.3V to V
CC
+ 0.3V
RMS Currents
IV
CC
................................................................. ±10mA
IHV
CC
.............................................................. ±20mA
I
REF
.................................................................. ±10mA
Operating Ambient Temperature Range
LTC2928C ................................................ 0°C to 70°C
LTC2928I .............................................–40°C to 85°C
Storage Temperature Range
SSOP Package ................................... –65°C to 150°C
QFN Package ..................................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
SSOP Package .................................................. 300°C
LTC2928
3
2928fa
For more information www.linear.com/LTC2928
elecTrical characTerisTics
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2928CG#PBF LTC2928CG#TRPBF LTC2928CG 36-Lead Plastic SSOP (5.3mm) 0°C to 70°C
LTC2928IG#PBF LTC2928IG#TRPBF LTC2928IG 36-Lead Plastic SSOP (5.3mm) 0°C to 70°C
LTC2928CUHF#PBF LTC2928CUHF#TRPBF LTC2928CUHF
38-Lead (5mm × 7mm) Plastic QFN
–40°C to 85°C
LTC2928IUHF#PBF LTC2928IUHF#TRPBF LTC2928IUHF
38-Lead (5mm × 7mm) Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
CC
= 3.3V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply Pins: V
CC
, HV
CC
V
VCC
V
CC
Input Supply Range
l
2.9 6 V
I
VCC
V
CC
Input Supply Current HV
CC
= GND
l
1 2.5 mA
V
UVL
V
CC
Input Supply Undervoltage Lockout V
CC
Rising
l
2.75 2.8 2.85 V
V
UVL(HYST)
Undervoltage Lockout Hysteresis
l
50 100 150 mV
V
HVCC
High Voltage Input Supply Range
l
7.2 12 16.5 V
V
CC(REG)
Regulated V
CC
from HV
CC
V
HVCC
= 12V
l
3.2 3.3 3.4 V
I
REG
Regulated V
CC
Output Current to
External Load (Note 2)
l
–10 mA
I
HVCC
HV
CC
Input Supply Current I
REG
= 0mA, V
HVCC
= 12V
l
1 2 mA
Sequence Up/Down Pin: ON
V
ON
ON Threshold Voltage V
ON
Rising
l
0.985 1.00 1.015 V
V
ON(HYST)
ON Hysteresis
l
20 30 40 mV
I
ON(LKG)
ON Leakage Current V
ON
= 1V
l
±50 nA
Voltage Monitor Pins: V1, V2, V3, V4
V
MON(TH)
Reset Threshold Voltage
V1 Negative Threshold Voltage
VSEL = V
CC
l
l
0.4925 0.500 0.5075
±18
V
mV
V
SEQ(TH)
Sequencing Thresholds
0.67 V
MON(TH)
0.33 V
MON(TH)
0.10 V
MON(TH)
See Table 4
l
l
l
0.315
0.149
0.032
0.333
0.167
0.05
0.351
0.185
0.068
V
V
V
I
MON(LKG)
Monitor Pin Leakage Current V
MON
= 0.55V
l
±15 nA
t
MON(UV)
Undervoltage Pulse Width Required to
Trip Comparators
V
MON
below V
MON(TH)
by 1% 225
µs
t
MON(OV)
Overvoltage Pulse Width Required to
Trip OV
V
MON
above Overvoltage Threshold by
1%
225
µs
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LTC2928IG#PBF

Mfr. #:
Buy LTC2928IG#PBF
Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits Quad Supply Sequencer/Supervisor
Lifecycle:
New from this manufacturer.
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