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PDF LTC4417 Data sheet ( Hoja de datos )
| Número de pieza | LTC4417 | |
| Descripción | Prioritized PowerPath Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Features
n Selects Highest Priority Supply from Three Inputs
n Blocks Reverse and Cross Conduction Currents
n Wide Operating Voltage Range: 2.5V to 36V
n –42V Protection Against Reverse Battery
Connection
n Fast Switchover Minimizes Output Voltage Droop
n Low 28µA Operating Current
n <1µA Current Draw from Supplies Less than VOUT
n 1.5% Input Overvoltage/Undervoltage Protection
n Adjustable Overvoltage/Undervoltage Hysteresis
n P-Channel MOSFET Gate Protection Clamp
n Cascadable for Additional Input Supplies
n 24-Lead Narrow SSOP and 4mm × 4mm QFN
Packages
Applications
n Industrial Handheld Instruments
n High Availability Systems
n Battery Backup Systems
n Servers and Computer Peripherals
LTC4417
Prioritized PowerPath™
Controller
Description
The LTC®4417 connects one of three valid power supplies
to a common output based on priority. Priority is defined
by pin assignment, with V1 assigned the highest priority
and V3 the lowest priority. A power supply is defined as
valid when its voltage has been within its overvoltage (OV)
and undervoltage (UV) window continuously for at least
256ms. If the highest priority valid input falls out of the
OV/UV window, the channel is immediately disconnected
and the next highest priority valid input is connected to the
common output. Two or more LTC4417s can be cascaded
to provide switchover between more than three inputs.
The LTC4417 incorporates fast non-overlap switching
circuitry to prevent both reverse and cross conduction
while minimizing output droop. The gate driver includes
a 6V clamp to protect external MOSFETs. A controlled
output ramp feature minimizes start-up inrush current.
Open drain VALID outputs indicate the input supplies have
been within their OV/UV window for 256ms.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath, ThinSOT and Hot Swap are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Typical Application
V1: 12V
WALL ADAPTER
IRF7324
V2: 14.8V Li-Ion
MAIN/SWAPPABLE
IRF7324
V3: 12V SLA
BACKUP
IRF7324
2A
OUTPUT
806k
39.2k
60.4k
V1 VS1 G1
UV1
OV1
1.05M
31.6k
68.1k
V2
UV2
OV2
698k
16.9k
49.9k
V3
UV3
OV3
VS2 G2
LTC4417
GND
VS3 G3
VOUT
VALID1
VALID2
VALID3
1M 1M 1M
EN
SHDN
HYS
CAS
4417 TA01a
Priority Switching from 12V V1 to 14.8V V2
V2 14.8V
12V
V1
2V/DIV
V3 = 0V, IL = 2A
CL = 120µF
VOUT
V1 UV FAULT
50ms/DIV
4417 TA01b
4417f
1
1 page  
Typical Performance Characteristics
Total Shutdown Supply Current
vs Supply Voltage
25
20
15
10
5
ALL SUPPLY AND VS PINS CONNECTED
TOGETHER, VOUT = 0V
0
0 10 20 30
40
SUPPLY VOLTAGE (V)
4417 G01
ΔVG vs Temperature
6.40
6.35
6.30
6.25
6.20
6.15
6.10
6.05
6.00
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4417 G04
Total Enabled Supply Current
vs Supply Voltage
40
35
30
25
20
15
10
5 ALL SUPPLY, VS AND VOUT
PINS CONNECTED TOGETHER
0
0 10 20 30
SUPPLY VOLTAGE (V)
40
4417 G02
Gate Falling Slew Rate
vs Temperature
16
14 V1 = 36V
CGATE = 10nF
V1 = V2 = V3
12 V1 = 24V
10
V1 = 12V
8
6
4 V1 = 5V
2
V1 = 2.7V
0
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
4417 G05
IG(DN) vs Temperature
3.0
2.5
2.0
1.5
1.0
0.5
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4417 G07
Switchover Time vs Temperature
3.0
2.5
2.0
1.5
1.0
0.5
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4417 G08
LTC4417
IV1-V3,VOUT(EN) vs Supply Voltage
16
14 VOUT = 4.9V
12
V2 = VS2
10
8
6
4
V1 = VS1 = 5V
2
V3 = VS3 = 2.8V
0
0 10 20 30 40
V2 = VS2 VOLTAGE (V)
4417 G03
Gate Rising Slew Rate
vs Temperature
16
V1 = 12V, 24V, 36V
12
V1 = 5V
8
4
V1 = 2.7V
0
–50 –25
V1 = V2 = V3
CGATE = 10nF
0 25 50 75
TEMPERATURE (°C)
100 125
4417 G06
Valid Delay Off Time
vs Temperature
8.5
8.4
8.3
8.2
8.1
8.0
7.9
7.8
7.7
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4417 G09
4417f
5
5 Page 
LTC4417
Applications Information
Introduction
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
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 VOUT and a
higher priority input supply becomes valid, the LTC4417
disconnects the lower priority supply and connects the
higher priority input supply to VOUT.
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.
12V WALL
ADAPTER
+
7.4V Li-Ion
PRIMARY
BA+TTERY
CIN1
2200µF
IRF7324
M1 M2
IRF7324
M3 M4
VOUT
+ CL
100µF
7.4V Li-Ion
SECONDARY
BATTERY
+
CV3
0.1µF
CV2
0.1µF
R9
931k
R8
63.4k
R7
137k
CV1
0.1µF
R6
931k
R5
63.4k
R4
137k
CVS1
0.1µF
CVS2
0.1µF
R3
806k
R2
39.2k
R1
60.4k
VS1
V1
UV1
OV1
G1
V2
UV2
IRF7324
M5 M6
CVS3
0.1µF
LTC3690
SWITCHING
REGULATOR
VS2 G2
VS3 G3
VOUT
R10 R11
1M 1M
VALID1
VALID2
VALID3
ADAPTER
INVALID
PRIMARY INVALID
SECONDARY INVALID
3.3V
4A
R12
1M
LTC4417
OV2
V3 EN
SHDN
UV3 HYS
CAS
OV3 GND
4417 F01
Figure 1. Typical Hand Held Computer Application.
4417f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC4417.PDF ] | |
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