1
dc1717afa
DEMO MANUAL DC1717A
Description
LTC4417
Prioritized PowerPath™ Controller
Demonstration circuit DC1717A uses the
to
arbitrate between three input supply rails, selecting the
highest priority, valid supply to power the load. The rail’s
priority is defined by the input connection (V1-V3). Each
rail has overvoltage and undervoltage thresholds set by
external resistors. If the highest priority rail voltage falls
out of the defined window (overvoltage or undervoltage),
the rail with the next highest priority, which is valid, is
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
performance summary
Specifications are at T
A
= 25°C
enabled and powers the load. Two or more LTC4417s
can be cascaded to provide switchover between more
than three rails.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1717A
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V1-V3, V
OUT
V1 to V3, V
OUT
Operating Supply Range
2.5
36
V
ΔV
G
Open (VS-VG) Clamp Voltage
V
OUT
= 11V, G1 to G3 = Open
5.4
6.2
6.7
V
ΔV
G(SOURCE)
Sourcing (VS-VG) Clamp Voltage
V
OUT
= 11V, I = –10µA
5.8
6.6
7
V
ΔV
G(SINK)
Sinking (VS-VG) Clamp Voltage
V
OUT
= 11V, I = 10µA
4.5
5.2
6
V
ΔV
G(OFF)
G1 to G3 Off (VS-VG) Threshold
V1 = V2 = V3 = 2.8V, V
OUT
= 2.6V, G1 to G3 Rising Edge
0.12
0.35
0.6
V
ΔV
G(SLEW,ON)
G1 to G3 Pull-Down Slew Rate
V
OUT
= 11V, C
GATE
= 10nF
4
9
20
V/µs
ΔV
G(SLEW,OFF)
G1 to G3 Pull-Up Slew Rate
V
OUT
= 11V, C
GATE
= 10nF
7.5
13
22
V/µs
I
GATE(LOW)
G1 to G3 Low Pull-Down Current
V
OUT
= 2.6V, V1 to V3 = 2.8V, (G1 to G3) = ΔV
G
+ 300mV
0.8
2
7
µA
V
REV
Reverse Voltage Threshold
Measure (V1 to V3) – V
OUT
, V
OUT
Falling
30
120
200
mV
t
G(SWITCHOVER)
Break-Before-Make Time
V
OUT
= 11V, C
GATE
= 10nF
0.7
2
3
µs
V
VALID(OL)
VALID1
to
VALID3
Output Low Voltage
I = 1mA, (V1 to V3) = 2.5V, V
OUT
= 0V
0.2
0.55
V
t
PVALID(OFF)
VALID1
to
VALID3
Delay OFF from
OV/UV Fault
5
8
13
µs
V
SHDN
(THR)
SHDN
Threshold Voltage
SHDN
Rising
0.4
0.8
1.2
V
V
SHDN
_EN(HYS)
SHDN
, EN Threshold Hysteresis
100
mV
I
SHDN
_EN
SHDN
, EN Pull-Up Current
SHDN
= EN = 0V
–0.5
–2
–5
µA
V
OV_UV(THR)
OV1 to O3, UV1 to UV3 Comparator
Threshold
V
OUT
= 11V, OV1 to OV3 Rising, UV1 to UV3 Falling
0.985
1
1.015
V
V
OV_UV(HYS)
OV1 to O3, UV1 to UV3 Comparator
Hysteresis
V
OUT
= 11V
15
30
45
mV
t
VALID
V1 to V3 Validation Time
100
256
412
ms
V1
Operating Voltage of Channel V1
9.6
12
14.4
V
V2
Operating Voltage of Channel V2
4
5
6
V
V3
Operating voltage of Channel V3
6.4
8
9.6
V
I
LOAD
Load Current
2
A
AVI
Auxiliary Voltage Input
6
24
V