Linear Technology LTC4417CUF Demoboard : Prioritized PowerPath Controller DC1717A DC1717A 데이터 시트
제품 코드
DC1717A
LTC4417
11
4417f
applicaTions inForMaTion
INTRODUCTION
The LTC4417 is an intelligent high voltage triple load switch
The LTC4417 is an intelligent high voltage triple load switch
which automatically connects one of three input supplies
to a common output based on predefined pin priorities
and validity. V1 is defined to be the highest priority and
V3 the lowest priority, regardless of voltage. An input
supply is defined valid when the voltage remains in the
user defined overvoltage (OV) and undervoltage (UV)
window for at least 256ms.
If a connected input supply falls out of the user defined
If a connected input supply falls out of the user defined
OV/UV window and remains outside the OV/UV window
for at least 8µs, the channel is disconnected and the next
highest valid priority is connected to the common output.
If a lower priority input supply is connected to V
OUT
and a
higher priority input supply becomes valid, the LTC4417
disconnects the lower priority supply and connects the
higher priority input supply to V
OUT
.
Typical LTC4417 applications are systems where predict-
able autonomous load control of multiple input supplies is
desired. These supplies may not necessarily be different
in voltage, nor must the highest voltage be the primary
supply. A typical LTC4417 application circuit is shown in
Figure 1. External component selection is discussed in
detail in the following sections.
VS1
V1
V
OUT
3.3V
4A
VALID1
VALID2
VALID3
VALID2
VALID3
12V WALL
ADAPTER
C
IN1
2200µF
7.4V Li-Ion
PRIMARY
BATTERY
UV1
OV1
R3
806k
R2
39.2k
R1
60.4k
R6
931k
R5
63.4k
R4
137k
R9
931k
R8
63.4k
R7
137k
R10
1M
R11
1M
R12
1M
PRIMARY INVALID
SECONDARY INVALID
SECONDARY INVALID
ADAPTER
INVALID
V2
UV2
OV2
V3
EN
SHDN
HYS
CAS
UV3
OV3
4417 F01
G1
VS2
VS3
G2
C
VS3
0.1µF
GND
LTC4417
G3
IRF7324
M5
M6
IRF7324
M3
M4
IRF7324
M1
M2
C
VS2
0.1µF
C
VS1
0.1µF
C
V1
0.1µF
C
V2
0.1µF
C
V3
0.1µF
+
C
L
100µF
V
OUT
+
+
7.4V Li-Ion
SECONDARY
BATTERY
+
LTC3690
SWITCHING
REGULATOR
Figure 1. Typical Hand Held Computer Application.