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LTC2928 Datasheet(PDF) 4 Page - Linear Technology

Part # LTC2928
Description  Multichannel Power Supply Sequencer and Supervisor
PDF  32 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC2928 Datasheet(HTML) 4 Page - Linear Technology

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LTC2928
4
2928f
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
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
●
0.045 • VCC
V
VRT(HI)
Voltage Required to Force Enable Pin
High Outside of Sequencing
●
0.955 • VCC
V
RRT
RT Pin Input Resistance
●
11.2
12
12.8
kΩ
Cascade Pin: CAS
VCAS(OL)
CAS Voltage Output Low
ICAS = 2.5mA
●
0.15
0.3
V
ICAS(UP)
CAS Pull-Up Current
Master Pulling CAS High, VCAS = GND
●
–45
–60
–75
μA
tCAS(HI)
Fixed Time Delay between Sequence
Time Positions (Note 5)
CAS High, CSTMR = 1500pF
●
11
13
15
ms
tCAS(MIN)
Minimum CAS Low Time During
Sequencing
●
15
22.5
30
μs
Fault Status Pin: FLT
VFLT(OL)
FLT Voltage Output Low
IFLT = 2.5mA
●
0.15
0.3
V
IFLT(UP)
FLT Pull-Up Current
VFLT = VCC –1V
●
–12
–17
–22
μA
VFLT(TH)
External Fault Input Threshold
VFLT Falling
●
1.0
1.1
1.2
V
VFLT(HYST)
External Fault Input Hysteresis
●
25
100
150
mV
tFLT
Minimum Detectable External Fault
Pulse Width
2
μs
IFLT(LKG)
Fault Pin Leakage Current
VFLT = VCC
●
± 1
μA
Done Status Pin: DONE
VDONE(OL)
DONE Voltage Output Low
IDONE = 2.5mA
●
0.15
0.3
V
IDONE(DN)
DONE Pull-Down Current
VDONE = 3.3V (Note 6)
●
20
40
μA
RDONE
Required Pull-Up Resistance on “Last”
LTC2928
5% Tolerance or Better
●
2.4
5.1
kΩ
VDONE(LAST)
Voltage Output High when Configured
as “Last”
●
0.8 • VCC
V
Reset Pin: RST
VRST(OL)
RST Voltage Output Low
VCC = 0.2V, IRST = 0.1μA
VCC = 0.5V, IRST = 5μA
VCC = 1V, IRST = 200μA
VCC = 3V, IRST = 2500μA
●
●
●
●
5
10
25
150
60
150
300
300
mV
mV
mV
mV
VRST(OH)
RST Voltage Output High
IRST = –1μA (Note 7)
●
VCC – 1
V
Timer Pins: RTMR, PTMR, STMR
ITMR(UP)
Timer Pull-Up Current
VTMR = GND
●
–1.7
–2
–2.3
μA
ITMR(DN)
Timer Pull-Down Current
VTMR = 1.3V
●
15
20
25
μA
tRTMR
tPTMR
tSTMR
Timer Period, RTMR (Note 8)
Timer Period, PTMR
Timer Period, STMR
CRTMR = 1500pF
CPTMR = 1500pF
CSTMR = 1500pF
●
●
●
5
5
11
6
6
13
7
7
15
ms
ms
ms
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.



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