Linear Technology LTC4417CUF Demoboard : Prioritized PowerPath Controller DC1717A DC1717A 데이터 시트
제품 코드
DC1717A
LTC4417
6
4417f
Typical perForMance characTerisTics
V
OUT
Switching from Higher to
Lower Voltage
V
OUT
Switching from Lower to
Higher Voltage with Slew Rate
Control Circuitry
Reverse Voltage Blocking
V
VALID(OL)
vs Pull-Up Current
V
OV,UV
vs Temperature
Deglitched Connection
pin FuncTions
CAS: Cascade Output. Digital output used for cascad-
ing multiple LTC4417s. Connect CAS to EN of another
LTC4417 to increase the number of multiplexed input
supplies. CAS is pulled up to the internal V
LDO
voltage
by an internal 20µA current source to indicate when all
inputs are invalid, the external P-channel MOSFETs are
determined to be off, and EN is above 1V. CAS also pulls
high when SHDN is driven below 1V. CAS is pulled low
when any input supply is within the OV/UV window for at
least 256ms and both SHDN and EN are above 1V. CAS
also pulls low when EN is driven below 1V. CAS can be
driven to 5.5V independent of the input supply voltages.
Leave open if not used.
EN: Channel Enable Input. EN is a high voltage input that
allows the user to quickly connect and disconnect chan-
nels without resetting the OV/UV timers. When below 1V,
all external back-to-back P-channel MOSFETs are driven
off by pulling G1, G2 and G3 to their respective VS1, VS2
and VS3. When above 1V, the highest valid priority chan-
nel is connected to the output. EN is pulled to the internal
V
LDO
voltage with a 2µA current source and can be pulled
up externally to a maximum voltage of 36V. Leave open
when not used.
Exposed Pad (UF Package Only): Exposed pad may be
Exposed Pad (UF Package Only): Exposed pad may be
left open or connected to device ground.
PULL-UP CURRENT (mA)
0
V
VALID
(OL)
(V)
0.5
0.4
0.2
0.3
0.1
0
0.5
1.0
1.5
4417 G10
2.0
TEMPERATURE (°C)
–50
V
OV
,UV
(V)
1.04
1.03
1.01
1.02
1.00
0.98
0.99
0.97
0.96
0
50
–25
25
100
4417 G11
125
75
V
UV(RISING)
V
OV(FALLING)
V
OV,UV(THR)
V2
V1
C
L
= 122µF
I
L
= 1A
–40V PCH FDD4685
100ms/DIV
4417 G12
2V/DIV
V
OUT
V1 = –20V
V1 = 20V
C
L
= 122µF
I
L
= 1A
–40V PCH FDD4685
5µs/DIV
4417 G15
V2, V
OUT
10V/DIV
V2
V1
C
L
= 122µF
I
L
= 1A
–40V PCH FDD4685
100µs/DIV
4417 G13
2V/DIV
V
OUT
V2
2V/DIV
V1
2V/DIV
I
VOUT
5A/DIV
R
S
= 1.43kΩ
C
S
= 6.8nF
C
L
= 100µF
I
L
= 1A
–40V PCH FDD4685
20µs/DIV
4417 G14
V
OUT