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参数资料
| 型号： | LTC4160EUDC#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY MANAGEMENT CKT, PQCC20 |
| 封装： | 3 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20 |
| 文件页数： | 18/32页 |
| 文件大小： | 422K |
| 代理商： | LTC4160EUDC#TRPBF |
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LTC4160/LTC4160-1
25
41601fa
APPLICATIONS INFORMATION
Hot Plugging and USB Inrush Current Limiting
The overvoltage protection circuit provides inrush current
limiting due to the long time it takes for OVGATE to fully
enhance the N-channel MOSFET. This prevents the current
from building up in the cable too quickly and dampens
out any resonant overshoot on VBUS. It is possible to
observe voltage overshoot on VBUS when connecting the
LTC4160/LTC4160-1 to a lab supply if the overvoltage
protection circuit is not used. This overshoot is caused by
the inductance of the long leads from the supply to VBUS.
Twisting the wires together from the supply to VBUS can
greatly reduce the parasitic inductance of these long leads
and keep VBUS at a safe level. USB cables are generally
manufactured with the power leads in close proximity and
thus have fairly low parasitic inductance.
Hot Plugging and USB On-The-Go
If there is more than 4.3V on VBUS when On-The-Go is
enabled, the bidirectional switching regulator will not try
to drive VBUS.IfUSBOn-The-Goisenabledandanexternal
supply is then connected to VBUS, one of three things will
happen depending on the properties of the external sup-
ply. If the external supply has a regulation voltage higher
than 5.1V, the bidirectional switching regulator will stop
Figure 8. Modified NTC Configuration
–
+
–
+
RNOM
105k
RNTC
100k
R1
12.7k
NTC
NTCBIAS
0.1V
NTC_ENABLE
41601 F08
LTC4160/LTC4160-1
NTC BLOCK
TOO_COLD
TOO_HOT
0.765 NTCBIAS
0.349 NTCBIAS
–
+
3
4
T
switching and VBUS will be held at the regulation voltage
of the external supply. If the external supply has a lower
regulation voltage and is capable of only sourcing current,
then VBUS will be regulated to 5.1V. The external supply
will not source current to VBUS.
For a supply that can also sink current and has a regulation
voltagelessthan5.1V,thebidirectionalswitchingregulator
will source current into the external supply in an attempt
to bring VBUS up to 5.1V. As long as the external supply
holds VBUS to more than VOUT + 70mV, the bidirectional
switching regulator will source up to 680mA into the sup-
ply. If VBUS is held to a voltage that is less than VOUT +
70mVthentheshortcircuittimerwillshutofftheswitching
regulator after 7.2ms. The FAULT pin will then go low to
indicate a short circuit current fault.
VBUS Bypass Capacitance and USB On-The-Go
Session Request Protocol
When two On-The-Go devices are connected, one will be
the A device and the other will be the B device depending
on whether the device is connected to a micro-A or micro-
B plug. The A device provides power to the B device and
starts as the host. To prolong battery life, the A device
can power down VBUS when the BUS is not being used.
If the A device has powered down VBUS, the B device can
request the A device to power up VBUS and start a new
session using the session request protocol (SRP). The
SRP consists of data-line pulsing and VBUS pulsing. The
B device must first pulse the D+ or D– data lines. The B
device must then pulse VBUS only if the A device does not
respond to the data-line pulse. The A device is required
to respond to only one of the pulsing methods. USB A
devices that never power down VBUS are not required to
respond to the SRP.
For VBUS pulsing, the limit on the VBUS capacitance on
the A device allows a B device to differentiate between a
powered down On-The-Go device and a powered down
standard host. The B device will send out a pulse of current
that will raise VBUS to a voltage between 2.1 and 5.25V if
connected to an On-The-Go A device which must have no
more than 6.5μF. An On-The-Go A device must drive VBUS
as soon as the current pulse raises VBUS above 2.1V if the
device is capable of responding to VBUS pulsing.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4210 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Supply Hot Swap Controller for Advanced Mezzanine Card |
| LTC4210-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Hot Swap Controller in 6-Lead SOT-23 Package |
| LTC42101CS6 | 制造商:Linear Technology 功能描述: |
| LTC4210-1CS6 | 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH 16.5V 6-Pin TSOT-23 |
| LTC4210-1CS6#PBF | 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH 16.5V 6-Pin TSOT-23 制造商:Linear Technology 功能描述:IC HOT SWAP CONT 制造商:Linear Technology 功能描述:HOT SWAP CNTRL 16.5VIN 6SOT23 制造商:Linear Technology 功能描述:HOT SWAP, CNTRL, 16.5VIN, 6SOT23 制造商:Linear Technology 功能描述:IC, HOT SWAP CONT; Controller Applications:Hot Board Insertion, Electronic Circuit Breaker, Industrial High Side Switch; Input Voltage:16.5V; Internal Switch:Yes; Supply Voltage Min:2.7V; Supply Voltage Max:16.5V; No. of Pins:6 ;RoHS Compliant: Yes |
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