TJ2205HD [HTC]
Dual-Channel Power Distribution Switch; 双通道配电开关
| 型号： | TJ2205HD |
| 厂家： | 
HTC KOREA TAEJIN TECHNOLOGY CO. |
| 描述： | Dual-Channel Power Distribution Switch |
| 文件： | 总13页 (文件大小：865K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Dual-Channel Power Distribution Switch
TJ2205
FEATURES
z 2.7V to 5.5V Operating Range
z 500mA Continuous Current per Channel
z 1.25A Maximum Short Circuit Current limit
z 90uA Typical On-State Supply Current
z 1uA Maximum Standby Supply Current
z Independent open-drain fault flag pins
z Thermal Shutdown Protection
SOP8 PKG
z 2.4V typical Under Voltage Lockout(UVLO)
z TJ2205H : Active High version
z TJ2205L : Active Low version
ORDERING INFORMATION
z UL Recognized. UL File No. E347996
Device
TJ2205HD
TJ2205LD
Package
APPLICATION
SOP8
z USB Peripherals
z General Purpose Power Switching
z ACPI Power Distribution
z Notebook PCs
z PDAs
z Hot Plug-in Power Supplies
DESCRIPTION
The TJ2205X is dual-channel High-Side MOSFET switches optimized for general-purpose power
distribution requiring circuit protection.
The TJ2205 series support the following USB requirements. Each of the two channels supplies up to
500mA as required by USB downstream devices. Each switch’s low on-resistance meets USB voltage
drop requirements. Fault current is limited to typically 1.2A. Flag output indicates fault conditions to the
local USB controller. Soft-start prevents the transient voltage drop on the upstream port that can occur
when the switch is enabled in bus-powered applications. Under voltage lockout (UVLO) feature disables
the output switches until a valid input voltage. Also the TJ2205 include thermal shutdown to prevent switch
failure from high-current loads.
Absolute Maximum Ratings
Characteristic
(Note 1)
Symbol
VIN
Min
-0.3
-0.3
-
Max
Unit
V
Supply Voltage
6.0
Enable Input Voltage
Fault Flag Voltage
Fault Flag Current
Output Voltage
(Note 2)
VEN
6.0
V
VFLG
IFLAG
VOUT
IOUT
6.0
V
-
25
mA
V
6.0
Internally Limited
150
Output Current
Storage Temperature Range
TSTG
-65
℃
Oct. 2011 – R1.1
- 1 -
HTC
Dual-Channel Power Distribution Switch
TJ2205
Operating Ratings
(Note 3)
Characteristic
Symbol
VIN
Min
2.7
-40
-40
-
Max
5.5
85
Unit
V
Supply Voltage
Ambient Temperature Range
TA
℃
Operating Junction Temperature Range
Thermal Resistance SOP Junction to Ambient
Thermal Resistance SOP Junction to Case
TJ
125
165
26
℃
θJA
℃/W
℃/W
θJC
-
Note:
1. Exceeding the absolute maximum ratings may damage the device.
2. It is recommended for VEN voltage not to exceed VIN voltage.
3. The device is not guaranteed to function outside its operating rating.
4. Devices are ESD sensitive. Handling precautions are recommended.
Ordering Information
TJ 2205
Package Type
Green Mode
: D
G
: SOP8
: Halogen Free
Blank : Pb Free
: Active – High
: Active – Low
H
L
Enable Mode
Root Name
Product Code
Oct. 2011 – R1.1
- 2 -
HTC
Dual-Channel Power Distribution Switch
TJ2205
TYPICAL APPLICATION CIRCUIT
USB
Ports
VCC
2.7V to 5V
VCONT
TJ2205
D+
7
D-
IN
8
0.1uF
VBUS
GND
OUT1
0.1uF
33uF
10K 10K
2
1
3
FLG1
EN1
USB
Control
D+
D-
FLG2
EN2
4
5
OUT2
VBUS
GND
0.1uF
33uF
GND
6
USB
Ports
FUNCTION BLOCK DIAGRAM
EN1
OUT1
Current
Limit
Flag
Logic
Gate
Control
FLG1
FLG2
Thermal
Shutdown
UVLO
BIAS
IN
Gate
Control
Flag
Logic
Current
Limit
EN2
OUT2
GND
Oct. 2011 – R1.1
- 3 -
HTC
Dual-Channel Power Distribution Switch
TJ2205
PIN CONFIGURATION
PIN DESCRIPTION
Pin No. Pin Name
Pin Description & Function
Enable1: Logic-Compatible enables input. (H: active high, L: active low).
1
2
3
4
5
6
7
8
EN1
FLG1
FLG2
EN2
Do not float.
Fault Flag1: Active-low, open-drain output. Indicates Short circuit, UVLO and
Thermal shutdown.
Fault Flag2: Active-low, open-drain output. Indicates Short circuit, UVLO and
Thermal shutdown.
Enable2: Logic-Compatible enables input. (H: active high, L: active low).
Do not float.
Switch Output2: Output MOSFET source. Typically connect to switched side of
load.
OUT2
GND
IN
Ground
Supply Input: Output MOSFET drain. Also supplies IC’s internal circuitry. Connect
to positive supply.
Switch Output1: Output MOSFET source. Typically connect to switched side of
load.
OUT1
Oct. 2011 – R1.1
- 4 -
HTC
Dual-Channel Power Distribution Switch
TJ2205
ELECTRICAL CHARACTERISTICS (Under the conditions of VIN=+5V and TA=25℃)
PARAMETER
Symbol
CONDITIONS
MIN
TYP
MAX
UNITS
V
Operating Voltage Range
VIN
2.7
5.5
1
Enable off ,OUT=Open
Enable on, OUT=Open
0.05
90
uA
Supply Current
ICC
160
uA
Enable Input Threshold
Voltage
VEN
(Note 5)
0.8
-1
1.7
2.4
1
V
Enable Input Current
IEN
VEN = 0V to 5.5V
0.01
1
uA
pF
mΩ
mΩ
us
us
us
us
uA
A
Enable Input Capacitance
CEN
VIN=5V, IOUT=500mA
160
200
50
200
230
Switch Resistance
RDS(ON)
VIN=3.3V, IOUT=500mA
RL=10Ω each output, CL=1uF
RL=10Ω each output, CL=1uF
RL=10Ω each output, CL=1uF
RL=10Ω each output, CL=1uF
VENX≤0.8V
Output Turn-On Delay
Output Turn-On Rise Time
Output Turn-Off Delay
Output Turn-Off Fall Time
Output leakage Current
Current Limit Threshold
Short Circuit Current Limit
TDON
TR
TDOFF
TF
ILEAK
ILIM
40
0.5
0.5
0.01
1.2
1.0
145
135
10
10
10
5
Ramped load applied to output
each output, VOUT=0V
Temperature increasing switch
Temperature decreasing switch
VIN=5V, IL=10mA
1.0
0.7
1.4
1.25
IOS
A
oC
oC
Ω
Over-Temperature
Shutdown Threshold
TTS
25
40
Error Flag Output Resistance
Error Flag Off Current
UVLO Threshold
RFO
VIN=3.3V, IL=10mA
15
Ω
IFOH
VFLAG=5V
0.01
2.5
2.3
10
uA
V
VIN = increasing
2.3
2.1
2.7
2.5
UVLO
VIN = decreasing
V
Overcurrent Flag Response
Delay
VIN=5V,
apply VOUT=0V until FLG low
TDFOV
0.45
ms
Note:
5. OFF is VEN≤0.8V and ON is VEN≥2.4V for the TJ2205H. OFF is VEN≥2.4V and ON is VEN≤0.8V for the TJ2205L.
Oct. 2011 – R1.1
- 5 -
HTC
Dual-Channel Power Distribution Switch
TJ2205
Test Circuit
Oct. 2011 – R1.1
- 6 -
HTC
Dual-Channel Power Distribution Switch
TJ2205
TYPICAL PERFORMANCE CHARACTERISTICS
ON-Resistance vs. Temperature
ON-Resistance vs. Supply Voltage
On-Current vs. Temperature
On-Current vs. Supply Voltage
Enable Threshold vs. Temperature
Enable Threshold vs. supply Voltage
Oct. 2011 – R1.1
- 7 -
HTC
Dual-Channel Power Distribution Switch
TJ2205
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Turn-On Delay Time vs. Temperature
Turn-On Delay Time vs. Supply voltage
Turn-On Rise Time vs. Temperature
Turn-On Rise Time vs. Supply Voltage
Turn-Off Fall Time vs. Temperature
Turn-Off Fall Time vs. Supply Voltage
Oct. 2011 – R1.1
- 8 -
HTC
Dual-Channel Power Distribution Switch
TJ2205
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Current Limit Threshold vs. Temperature
Current Limit Threshold vs. Supply Voltage
Short Circuit Current vs. Temperature
UVLO vs. Temperature
Oct. 2011 – R1.1
- 9 -
HTC
Dual-Channel Power Distribution Switch
TJ2205
TYPICAL OPERATING CHARACTERISTICS
-
VIN=5V, C1=1uF, VEN=VIN, TA=25oC, unless otherwise noted
Turn – ON / Turn-OFF
Turn – ON
Turn – OFF
Inrush Current Response
Enable Into Short
(TJ2205H)
Thermal Shutdown
Oct. 2011 – R1.1
- 10 -
HTC
Dual-Channel Power Distribution Switch
TYPICAL OPERATING CHARACTERISTICS (continued)
UVLO – VIN Rising
TJ2205
UVLO – VIN Falling
Oct. 2011 – R1.1
- 11 -
HTC
Dual-Channel Power Distribution Switch
TJ2205
Function Description
Supply Filtering
A 0.1uF to 1uF bypass capacitor from IN pin to GND pin is recommended to control power supply
transients. Without this bypass capacitor, an output short can cause ringing from supply lead inductance
on the input and damage the internal control circuitry.
Input or output transients must never exceed the absolute maximum supply voltage (VINmax = 6V)
Power Dissipation
The device’s junction temperature depends on several factors such as the load, PCB layout, ambient
temperature, and package type. Equations that can be used to calculate power dissipation of each
channel and junction temperature are found below:
2
PD=RDS(ON)
x IOUT
Total power dissipation of the device will be the summation of PD for both channels. To relate this to
junction temperature, the following equation can be used:
TJ=PD x θJA +TA
Where:
TJ = Junction temperature
TA = Ambient temperature
θJA= Thermal resistance of the package
Enable/Shutdown
The EN1 and EN2 control pins must be driven to a logic high or logic low for a clearly defined signal input.
Floating these control lines may cause unpredictable operation.
Fault Flag
The FLG signal is open-drained output of N-channel MOSFET, the FLG output is pulled low to signal the
following fault conditions: input under voltage, output to GND short, and thermal shutdown.
Soft-Start Condition
The TJ2205 has high impedance when off, which gradually shifts to low impedance as the chip turns on.
This prevents an inrush current from causing voltage drops that result from charging a capacitive load and
can pull the USB voltage bus below specified levels. This satisfies the USB voltage droop requirements
for bus-powered applications.
The TJ2205 can provide inrush current limiting for applications with large load capacitances where CL
>10uF.
Current Sense
A sense MOSFET monitors the current supplied to the load. The sense MOSFET measures current more
efficiently than conventional resistance methods. When an overload or short circuit is encountered, the
current-sense circuitry sends a control signal to the driver. The driver in turn reduces the gate-source
voltage and drives the power MOSFET into its saturation region, which switches the output into a
constant-current mode and holds the current constant while varying the voltage on the load.
Over-Current and Short-Circuit Protection
The TJ2205 features an over-current protection circuitry to protect the device against overload conditions.
The current limit threshold is preset internally. It protects the output MOSFET switches from damage due
to undesirable short circuit conditions of excess inrush current often encountered during hot plug-in. The
low limit of the current limit threshold of the TJ2205 allows a minimum current of 0.5A through the
Oct. 2011 – R1.1
- 12 -
HTC
Dual-Channel Power Distribution Switch
TJ2205
MOSFET switches. A current limit condition will signal the error flag. These features can protect the load
system effectively at any accidental circumstances.
Thermal Shutdown Protection
Thermal shutdown limits the TJ2205 junction temperature and protects the device from damage as a
result of overheated.
Thermal protection turns off when the TJ2205’s junction temperature 145℃ reached, allowing it to cool
down until 135℃. The TJ2205 is reactivated when a junction temperature drops to approximately 130℃.
It depends on the power dissipation, thermal resistance, and ambient temperature.
Under Voltage Lockout
Under Voltage Lockout (UVLO) prevents the output MOSFET from turning on until VIN exceeds
approximately 2.5V. After the switch turns on, if the voltage drops below 2.3V typically, UVLO shuts off
the output MOSFET. Under voltage detection functions only when the switch is enabled.
Printed Circuit Layout
The power circuitry of USB printed circuit boards requires a customized layout to maximize thermal
dissipation and to minimize voltage drop and EMI.
USB Compliance
The TJ2205 is ideal for self-powered and bus powered Universal Serial Bus (USB) applications. A USB
port provides a +5.0V bus and ground return line in addition to a twisted pair for data.
The TJ2205 will comply with the following USB requirements:
1) The fault current is well below the UL 25VA safety requirements.
2) The Flag Outputs are available to indicate fault conditions to USB controllers.
3) The MOSFET switches' low on-resistance meets USB voltage drop requirements.
4) Each MOSFET switch channel can supply 500mA as required by USB downstream devices.
5) Soft start eliminates any momentary voltage drops on the upstream port that may occur when the
switches are enabled in bus-powered applications.
6) An Under-voltage Lockout ensures that the device remains off unless there is a valid input supply
voltage present.
7) +2.7V and +5.0V logic compatible enable inputs.
8) Thermal Shutdown prevents the possibility of catastrophic switch failure from high-current loads.
8) The device is available in both active-high and active-low versions.
Table 1. USB Protocol Compliance of the TJ2205 device
USB REQUIREMENT
Inrush Current limiting required
TJ2205 COMPLIANT FEATURE
Soft Start turns on in 1ms
Suspend State of <500uA Required
Suspend Current of 1uA Maximum
Bus powered hubs must have 350mV drop from
cable plug to port.
Switch on resistance of 200mΩ maximum
(translates to 100mV at 500mA)
Voltage supplied to host or hub port is +4.75V to
+5.25V
Operating range of +2.7V to +5.5V
Turn on in 1ms
A device that draws bus power must have a stable
supply within 100ms of VBUS reaching +4.4V
Over-Current reporting capability required
Open drain fault flags.
Oct. 2011 – R1.1
- 13 -
HTC
相关型号：
TJ22514200J0G
Barrier Strip Terminal Block, 20A, 2.5mm2, 1 Row(s), 1 Deck(s), ROHS COMPLIANT
AMPHENOL
TJ22516200J0G
Barrier Strip Terminal Block, 20A, 2.5mm2, 1 Row(s), 1 Deck(s), ROHS COMPLIANT
AMPHENOL
©2020 ICPDF网 联系我们和版权申明