TD9516 [TECHCODE]
Power-Distribution Switches;
| 型号： | TD9516 |
| 厂家： | 
TECHCODE SEMICONDUCTOR, INC. |
| 描述： | Power-Distribution Switches |
| 文件： | 总16页 (文件大小：991K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DATASHEET
USB Power-Distribution Switches
TD9516/TD9517/TD9518/TD9519
General Description
Features
The TD9516/TD9517/TD9518/TD9519 series of power
switches are designed for USB applications. The
62mΩ High Side MOSFET
Wide Supply Voltage Range: 2.7V to 5.5V
Current-Limit and Short-Circuit Protections
Over-Temperature Protection
Fault Indication Output
62mN-channel MOSFET power switch satisfies the voltage
drop requirements of USB specification.
The protection features include current-limit protection,
short-circuit protection, and over-temperature
Enable Input
protection.The device limits the output current at current
limit threshold level. When VOUT drops below 1.5V, the devices
limit the current to a lower and safe level. The
Lead Free and Green Devices Available
Applications
over-temperature protection limits the junction temperature
below 140 C in case of short circuit or over load
o
Notebook and Desktop Computers
conditions.Other features include a deglitched OCB output to
indicate the fault condition and an enable input to enable or
disable the device.
USB Ports
High-Side Power Protection Switches
Pin Configurations
SOT-23-5(Top View)
TD9516A/TD9517A
SOT-23-5(Top View)
TD9518A/TD9519A
SOT-23-5(Top View)
TD9516B/TD9517B
SOT-23-5(Top View)
TD9518B/TD9519B
Figure Pin Configuration of TD9516/TD9517/TD9518/TD9519(Top View)
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DATASHEET
USB Power-Distribution Switches
TD9516/TD9517/TD9518/TD9519
Pin Description
Pin Number
Pin
Description
Name
TD9516/
TD9517
TD9518/
TD9519
Output Voltage Pin. The output voltage follows the input voltage. When ENB is
high or EN is low, the output voltage is discharged by an internal resistor.
Ground.
1
2
3
5
2
1
VOUT
GND
OCB
Fault Indication Pin. This pin goes low when a current limit or an
over-temperature condition is detected after a 12ms deglitch time.
Enable Input. Pulling this pin to high will enable the device and pulling this pin to
low will disable device. The EN pin cannot be left floating.
EN
4
5
3
4
Enable Input. Pulling this pin to high will enable the device and pulling this pin to
low will disable device. The EN pin cannot be left floating.
ENB
VIN
Power Supply Input. Connect this pin to external DC supply.
Ordering Information
TD951X □ □ □
Circuit Type
A/B:
Packing:
A- Enable High
B- Enable Low
Blank：Tube
R:Type and Reel
T:SOT-23
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DATASHEET
USB Power-Distribution Switches
TD9516/TD9517/TD9518/TD9519
Functional Block Diagram
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
VIN
VIN Input Voltage (VIN to GND)
VOUT to GND Voltage
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
150
V
V
V
VOUT
VENB, VEN
VOCB
TJ
TSTG
TSDR
EN, ENB to GND Voltage
OCB to GND Voltage
V
o
Maximum Junction Temperature
Storage Temperature
Maximum Soldering Temperature, 10 Seconds
C
o
-65 ~ 150
260
C
o
C
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Exposure to absolute maximum rating conditions
for extended periods may affect device reliability.
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USB Power-Distribution Switches
TD9516/TD9517/TD9518/TD9519
Recommended Operating Conditions
Symbol Parameter
Range
2.7~5.5
Unit
V
VIN
VIN Input Voltage
VCC
VCC Supply Voltage
OUT Output Current (TD9516/TD9518)
4.5 ~ 5.5
0~1
0~ 2.4
-40 ~ 85
-40 ~ 125
V
A
A
IOUT
OUT Output Current (TD9517/TD9519)
o
TA
TJ
Ambient Temperature
Junction Temperature
C
C
o
Note: Refer to the typical application circuit.
ThermalCharacteristics
Symbol
Parameter
Typical Value
Unit
Junction-to-Ambient Resistance in Free Air
°C/W
JA
235
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USB Power-Distribution Switches
TD9516/TD9517/TD9518/TD9519
Electrical Characteristics
Unless otherwise specified, these specifications apply over VIN=5V, VEN =5V or VENB=0V and T
A= -40 ~ 85
oC. Typical values are at T
A
=25 C.
o
Symbol
Parameter
Test Conditions
Unit
Min.
Typ.
Max.
SUPPLY CURRENT
No load, VEN=0V or VENB=5V
1
A
-
-
VIN Supply Current
No load, VEN=5V or VENB=0V
60
100
1
A
A
A
Leakage Current
VOUT=GND, VEN=0V or VENB=5V
VIN=GND, VOUT=5V, VEN=0V or VENB=5V
-
-
-
-
Reverse Leakage Current
1
POWER SWITCH
Power Switch On Resistance
RDS(ON)
IOUT=1A, TA= 25 oC
62
78
m
UNDER-VOLTAGE LOCKOUT (UVLO)
VIN UVLO Threshold Voltage
VIN UVLO Hysteresis
VIN rising, TA= -40 ~ 85 oC
1.7
2.65
V
V
0.2
CURRENT-LIMIT AND SHORT-CIRCUIT PROTECTIONS
TD9517/TD9519 VIN=2.7V to 5.5V, TA= -40 ~ 85 oC
2.5
1.1
2.8
1.3
1.5
0.8
3.2
1.5
A
A
A
A
ILIM
Current Limit Threshold
TD9516/TD9518 VIN=2.7V to 5.5V, TA= -40 ~ 85 oC
TD9517/TD9519, VIN=2.7V to 5.5V
ISHORT
Short-Circuit Output Current
TD9516/TD9518, VIN=2.7V to 5.5V
OCB OUTPUT PIN
OCB Output Low Voltage
IOCB=5mA
0.2
12
0.4
V
OCB Leakage Current
OCB Deglitch Time
VOCB=5V
uA
mS
1
tD(OCB)
OCB assertion, TA= -40 ~ 85 oC
5
2
20
EN OR ENB INPUT PIN
VIH
VIL
Input Logic HIGH
VIN=2.7V to 5V
VIN=2.7V to 5V
V
Input Logic LOW
0.8
1
V
Input Current
uA
VOUT Discharge Resistance
Turn On Delay Time
Turn Off Delay Time
Soft-Start Time
VEN=0V or VENB=5V, VOUT=1V
40
30
30
tD(ON)
tD(OFF)
tSS
uS
uS
uS
400
No load, COUT=1F, VIN=5V
OVER-TEMPERATURE PROTECTION (OTP)
TOTP
Over-Temperature Threshold
Over-Temperature Hysteresis
TJ rising
140
20
C
C
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DATASHEET
USB Power-Distribution Switches
TD9516/TD9517/TD9518/TD9519
Typical Operating Characteristics
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DATASHEET
USB Power-Distribution Switches
TD9516/TD9517/TD9518/TD9519
Typical Operating Characteristics(Cont.)
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DATASHEET
USB Power-Distribution Switches
TD9516/TD9517/TD9518/TD9519
Typical Operating Characteristics(Cont.)
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DATASHEET
USB Power-Distribution Switches
TD9516/TD9517/TD9518/TD9519
Typical Operating Characteristics(Cont.)
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DATASHEET
USB Power-Distribution Switches
TD9516/TD9517/TD9518/TD9519
Typical Operating Characteristics(Cont.)
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DATASHEET
USB Power-Distribution Switches
TD9516/TD9517/TD9518/TD9519
Operating Waveforms
VIN =5V, RLOAD =30, CIN =33F/Electrolytic,
COUT =1F/Electrolytic
VIN =5V, RLOAD =30, CIN =33F/Electrolytic,
COUT =1F/Electrolytic
CH1: VENB, 5V/Div, DC
CH1: VENB, 5V/Div, DC
CH2: VOUT, 2V/Div, DC
CH2: VOUT, 2V/Div, DC
TIME: 200s/Div
TIME: 100s/Div
VIN =5V, RLOAD =30, CIN =33F/Electrolytic,
COUT =1F/Electrolytic
VIN =5V, RLOAD =30, CIN =33F/Electrolytic,
COUT =1F/Electrolytic
CH1: VIN, 1V/Div, DC
CH1: VIN, 1V/Div, DC
CH2: VOUT, 1V/Div, DC
TIME: 2ms/Div
CH2: VOUT, 1V/Div, DC
TIME: 2ms/Div
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DATASHEET
USB Power-Distribution Switches
TD9516/TD9517/TD9518/TD9519
Operating Waveforms(Cont.)
TD9516A, VIN =5V, OUT short to GND,
TD9516A, VIN =5V, CIN =COUT=33F/Electrolytic
CH1: VOCB, 5V/Div, DC
C
IN =COUT=33F/Electrolytic
CH1: VEN, 5V/Div, DC
CH2: VOCB, 5V/Div, DC
CH3: IOUT, 1A/Div, DC
TIME: 5ms/Div
CH2: VOUT, 2V/Div, DC
CH3: IOUT, 1A/Div, DC
TIME: 5ms/Div
TD9516A, VIN =5V, OUT Short to GND,
TD9517A, VIN =5V, RLOAD =1k 2.2
C
IN =33F/Electrolytic, No COUT
CH1: VIN, 2V/Div, DC
CH2: VOUT, 2V/Div, DC
CH3: IOUT, 5A/Div, DC
TIME: 50s/Div
C
IN =COUT=33F/Electrolytic
CH1: VOUT, 1V/Div, DC
CH2: IOUT, 1A/Div, DC
TIME: 1ms/Div
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DATASHEET
USB Power-Distribution Switches
TD9516/TD9517/TD9518/TD9519
Type Application Circuit
Function Description
VIN Under-Voltage Lockout (UVLO)
OCB Output
TheTD951X series of power switches provide an open-drain
output to indicate that a fault has occurred. When any of
current-limit or over-temperature protection occurs for a deglitch
time of tD(OCB), the OCB goes low. Since the OCB pin is an
open-drain output, connecting a resistor to a pull high voltage is
necessary.
The TD951X series of power switches have a built-in
under-voltage lockout circuit to keep the output shutting off
until internal circuitry is operating properly. The UVLO circuit
has hysteresis and a de-glitch feature so that it will typically
ignore undershoot transients on the input. When input
voltage exceeds the UVLO threshold, the output voltage
starts a soft-start to reduce the inrush current.
Power Switch
Enable/Disable
Pull the ENB above 2V or EN below 0.8V will disable the device,
The power switch is an N-channel MOSFET with a low RDS(ON). The and pull ENB pin below 0.8V or EN above 2V will enable the
internal power MOSFET does not have the body diode. When IC is device. When the IC is disabled, the supply current is reduced to
off, the MOSFET prevents a current flowing from the VOUT back
to VIN and VIN to VOUT.
less than 1A. The enable input is compatible with both TTL and
CMOS logic levels. The EN/ENB pin cannot be left floating.
Over-Temperature Protection
Current-Limit Protection
When the junction temperature exceeds 140
o
C, the internal
The TD951X series of power switches provide the current- limit
protection function. During current-limit, the devices limit output
thermal sense circuit turns off the power FET and allows the
current at current limit threshold. For reliable operation, the device device to cool down. When the device’s junction temperature cools
should not be operated in current-limit for extended period.
by 20
oC, the internal thermal sense circuit will enable the device,
Short-Circuit Protection
resulting in a pulsed output during continuous thermal protection.
When the output voltage drops below 1.5V, which is caused by an Thermal protection is designed to protect the IC in the event of
over-load or a short-circuit, the devices limit the output current
down to a safe level. The short-circuit current limit is used to
reduce the power dissipation during short-circuit conditions. If the
junction temperature reaches over-temperature threshold, the
device will enter the thermal shutdown.
over temperature conditions. For normal operation, the junction
temperature cannot exceed T =+125 C.
J
o
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DATASHEET
USB Power-Distribution Switches
TD9516/TD9517/TD9518/TD9519
Application Information
Input Capacitor
Layout Consideration
The PCB layout should be carefully performed to maximize
A 1F ceramic bypass capacitor from VIN to GND, located near
the TD951X, is strongly recommended to suppress the ringing thermal dissipation and to minimize voltage drop, droop and
during short circuit fault event. Without the bypass capacitor, EMI. The following guidelines must be considered:
the output short may cause sufficient ringing on the input 1. Please place the input capacitors near the VIN pin as close
(from supply lead inductance) to damage internal control as possible.
circuitry.
2. Output decoupling capacitors for load must be placed near
the load as close as possible for decoupling highfrequency
ripples.
Output Capacitor
A low-ESR 10F aluminum electrolytic or tantalum between
V
OUT and GND is strongly recommended to reduce the voltage 3. Locate TD951X and output capacitors near the load to
drop during hot-attachment of downstream peripheral. (Per reduce parasitic resistance and inductance for excellent load
transient performance.
USB 2.0, output ports must have a minimum 120F of
low-ESR bulk capacitance per hub).
4. The negative pins of the input and output capacitors and
Higher-value output capacitor is better when the output load the GND pin must be connected to the ground plane of the
load.
is heavy. Additionally, bypassing the output with a 0.1F
ceramic capacitor improves the immunity of the device to 5. Keep VIN and VOUT traces as wide and short as possible.
short-circuit transients.
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DATASHEET
USB Power-Distribution Switches
TD9516/TD9517/TD9518/TD9519
Package Information
TSOT23-5 Package Outline Dimensions
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DATASHEET
USB Power-Distribution Switches
TD9516/TD9517/TD9518/TD9519
Design Notes
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