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LTC2928 데이터시트 PDF




Linear Technology에서 제조한 전자 부품 LTC2928은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

PDF 형식의 LTC2928 자료 제공

부품번호 LTC2928 기능
기능 Multichannel Power Supply Sequencer and Supervisor
제조업체 Linear Technology
로고 Linear Technology 로고


LTC2928 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.




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LTC2928 데이터시트, 핀배열, 회로
FEATURES
LTC2928www.DataSheet4U.com
Multichannel Power Supply
Sequencer and Supervisor
DESCRIPTIO
Easily Configure Power Management
without Software
Controls Up to Four Supplies per Device
Cascades for Additional Supplies
Staged Supply Sequencing with
Adjustable Time Positions
Fault Event Reporting with Diagnostics
Selectable System Shutdown on Fault
1.5% Undervoltage Monitor Accuracy
Overvoltage and/or Fault Indication
Configurable Undervoltage and
Overvoltage Thresholds
Charge Pumped Enable Pins Drive N-Channel
MOSFETs
Operates from 2.9V to 16.5V
5mm × 7mm 38-lead QFN and
AP36P-lLeaIdCSASTOIPOPaUckSages
Network/Telecom Infrastructure
Sequencing for Multiple I/O and Core Voltages
Power Management
, LT, LTC and LTM 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.
The LTC®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 shutdown 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.
TYPICAL APPLICATIO
12V
ON
LTM4600
VIN VOUT
RUN
LTC1628
VIN VOUT
RUN
10k VINLTC3414VOUT
RUN
AUSTIN LYNX
VIN VOUT
Si7894ADP
AXA010AY93
100
0.1 F
95.3k
24.3k
9.53k
1.5k
3.4k
1F
HVCC EN2 EN1 EN4 EN3
ON
RT1
RT2
RT3
RT4
DONE
VCC
GND MS1 VSEL
V1
V2
LTC2928
V3
V4
RST
OV
FLT
RTMR PTMR STMR
0.047 F
3300pF
ALL RESISTORS 1%
3.3V
1.2V
2.5V
1.8V
12.1k
36.5k
23.2k
51.1k
SYSTEM
RESET
FAULT
10k 10k 10k 10k
2928 TA06
Sequencing Up and Down
3.3V
2.5V
1.8V
1.2V
1V/DIV
ON
DONE
START
SEQUENCE SEQUENCE UP START
UP COMPLETE SEQUENCE
DOWN
SEQUENCE
DOWN
COMPLETE
2928 TA07
2928f
1




LTC2928 pdf, 반도체, 판매, 대치품
LTC2928
www.DataSheet4U.com
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VCC = 3.3V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
Sequence Time Position Control Inputs: RT1, RT2, RT3, RT4 (see resistor selection Table 3)
VRT(LO)
Voltage Required to Force Enable Pin
Low While Sequencing
VRT(HI)
Voltage Required to Force Enable Pin
High Outside of Sequencing
RRT RT Pin Input Resistance
Cascade Pin: CAS
VCAS(OL)
ICAS(UP)
tCAS(HI)
CAS Voltage Output Low
CAS Pull-Up Current
Fixed Time Delay between Sequence
Time Positions (Note 5)
ICAS = 2.5mA
Master Pulling CAS High, VCAS = GND
CAS High, CSTMR = 1500pF
tCAS(MIN)
Minimum CAS Low Time During
Sequencing
Fault Status Pin: FLT
VFLT(OL)
IFLT(UP)
VFLT(TH)
VFLT(HYST)
tFLT
FLT Voltage Output Low
FLT Pull-Up Current
External Fault Input Threshold
External Fault Input Hysteresis
Minimum Detectable External Fault
Pulse Width
IFLT = 2.5mA
VFLT = VCC –1V
VFLT Falling
IFLT(LKG)
Fault Pin Leakage Current
Done Status Pin: DONE
VFLT = VCC
VDONE(OL)
IDONE(DN)
RDONE
DONE Voltage Output Low
DONE Pull-Down Current
Required Pull-Up Resistance on “Last”
LTC2928
IDONE = 2.5mA
VDONE = 3.3V (Note 6)
5% Tolerance or Better
VDONE(LAST)
Voltage Output High when Configured
as “Last”
Reset Pin: RST
VRST(OL)
RST Voltage Output Low
VRST(OH)
RST Voltage Output High
Timer Pins: RTMR, PTMR, STMR
VCC = 0.2V, IRST = 0.1μA
VVCCCC
=
=
01.V5,VI,RISRTS=T
= 5μA
200μA
VCC = 3V, IRST = 2500μA
IRST = –1μA (Note 7)
ITMR(UP)
ITMR(DN)
tRTMR
tPTMR
tSTMR
Timer Pull-Up Current
Timer Pull-Down Current
Timer Period, RTMR (Note 8)
Timer Period, PTMR
Timer Period, STMR
VTMR = GND
VTMR = 1.3V
CRTMR = 1500pF
CPTMR = 1500pF
CSTMR = 1500pF
MIN TYP MAX
0.045 • VCC
0.955 • VCC
11.2 12 12.8
0.15 0.3
–45 –60 –75
11 13 15
15 22.5 30
–12
1.0
25
0.15
–17
1.1
100
2.4
0.15
20
0.8 • VCC
0.3
–22
1.2
150
2
±1
0.3
40
5.1
VCC – 1
5
10
25
150
–1.7
15
5
5
11
–2
20
6
6
13
60
150
300
300
–2.3
25
7
7
15
UNITS
V
V
kΩ
V
μA
ms
μs
V
μA
V
mV
μs
μA
V
μA
kΩ
V
mV
mV
mV
mV
V
μA
μA
ms
ms
ms
2928f
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LTC2928 전자부품, 판매, 대치품
TYPICAL PERFORMANCE CHARACTERISTICS
LTC2928www.DataSheet4U.com
Reference Output Voltage vs
Temperature
1.200
1.196
1.192
1.188
1.184
1.180
–50 –25
0
25 50
TEMPERATURE (°C)
75 100
2928 G05
ON Threshold Voltage (Rising) vs
Temperature
1.015
1.010
1.005
1.000
0.995
0.990
0.985
–50 –25
0
25 50
TEMPERATURE (°C)
75 100
2928 G01
Sequence, Reset and Power-
Good Timing vs Capacitance
10
1
100m
SEQUENCER TIMER
10m
RESET AND
POWER-GOOD TIMER
1m
100
10p
100p
1n 10n
CAPACITANCE (F)
100n 1
2928 G19
Comparator Under-Voltage
Glitch Immunity
1k
RESET OCCURS
ABOVE CURVE
100
COMPARATOR
IGNORES GLITCH
10
0.1
1 10
COMPARATOR OVERDRIVE
(% OF RESET THRESHOLD)
100
2928 G15
Relative Reset Output Voltage vs
VtoCCVC(wC)ith Reset Pull-Up Resistor
50
1k
40
30
5k
20 10k
10
100k
0
0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5
VCC (V)
2928 G17
Three State Selection Pin Current
vs Pin Voltage
(SQT1, SQT2, MS1, MS2, RDIS)
20
15
10
5
0
–5
–10
–15
–20
0.3
0.6 0.9 1.2 1.5
THREE STATE PIN VOLTAGE (V)
2928 G20
Comparator Over-Voltage
Glitch Immunity
1k
OV OCCURS
ABOVE CURVE
100
COMPARATOR
IGNORES GLITCH
10
0.1
1 10
COMPARATOR OVERDRIVE
(% OF OV THRESHOLD)
100
2928 G16
RST Pull-Up Current vs
External Voltage on RST
–70
–60 VCC = 5V
–50
–40
–30
–20 VCC = 3.3V
–10
0
012345
VRST (V)
2928 G17
IFLT(UP) vs Temperature
–22
VFLT = 2.3V
–20
–18
–16
–14
–12
–50
–25 0
25 50
TEMPERATURE (°C)
75 100
2928 G21
2928f
7

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