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AP2162SG-U [DIODES]

Buffer/Inverter Based Peripheral Driver, 2 Driver, 1A, PDSO8, GREEN, SOP-8;
AP2162SG-U
型号： AP2162SG-U
厂家： DIODES INCORPORATED    DIODES INCORPORATED
描述：

Buffer/Inverter Based Peripheral Driver, 2 Driver, 1A, PDSO8, GREEN, SOP-8

驱动 光电二极管 接口集成电路 驱动器
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中文：  中文翻译
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AP2162/AP2172  
1.0A DUAL CHANNEL CURRENT-LIMITED POWER  
SWITCH  
Description  
Features  
The AP2162 and AP2172 are integrated high-side power switches  
optimized for Universal Serial Bus (USB) and other hot-swap  
applications. The family of devices complies with USB 2.0 and  
available with both polarities of Enable input. They offer current  
and thermal limiting and short circuit protection as well as  
controlled rise time and under-voltage lockout functionality. A 7ms  
deglitch capability on the open-drain Flag output prevents false  
over-current reporting and does not require any external  
components.  
•
•
•
•
•
•
•
•
•
Dual USB port power switches  
Over-current and thermal protection  
1.5A accurate current limiting  
Reverse Current Blocking  
115mΩ on-resistance  
Input voltage range: 2.7V – 5.5V  
0.6ms typical rise time  
Very low shutdown current: 1uA (max)  
Fault report (FLG) with blanking time (7ms typ)  
ESD protection: 4.5KV HBM, 350V MM  
All devices are available in SOP-8L and MSOP-8L-EP packages.  
•
•
Active high (AP2172) or active low (AP2162) enable  
•
•
Ambient temperature range -40ºC to 85°C  
SOP-8L and MSOP-8L-EP (Exposed Pad): Available in  
“Green” Molding Compound (No Br, Sb)  
•
•
Lead Free Finish / RoHS Compliant (Note 1)  
UL pending, File E322375  
Applications  
•
•
•
Consumer electronics – LCD TV & Monitor, Game Machines  
Communications – Set-Top-Box, GPS, Smartphone  
Computing – Laptop, Desktop, Servers, Printers, Docking Station, HUB  
Ordering Information  
AP 21 X 2 XX G - X  
Package  
Packing  
U : Tube  
13 : Tape & Reel  
Lead Free  
G : Green  
Enable  
Channel  
2 : 2 Channel  
6 : Active Low  
7 : Active High  
S : SOP-8L  
MP : MSOP-8L-EP  
Tube  
Part Number  
13” Tape and Reel  
Package  
Code  
Packaging  
(Note 2)  
Device  
Part Number  
Quantity  
Quantity  
Suffix  
Suffix  
AP21X2SG-U  
S
S
MP  
MP  
SOP-8L  
SOP-8L  
MSOP-8L-EP  
MSOP-8L-EP  
100  
NA  
80  
-U  
NA  
-U  
NA  
NA  
NA  
-13  
NA  
-13  
AP21X2SG-13  
AP21X2MPG-U  
AP21X2MPG-13  
2500/Tape & Reel  
NA  
2500/Tape & Reel  
NA  
Notes:  
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied, see EU Directive 2002/95/EC Annex Notes.  
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at  
http://www.diodes.com/datasheets/ap02001.pdf.  
AP2162/AP2172 Rev. 1  
1 of 17  
OCTOBER 2008  
www.diodes.com  
© Diodes Incorporated  
AP2162/AP2172  
1A DUAL CHANNEL CURRENT-LIMITED POWER  
SWITCH  
Pin Assignment  
( Top View )  
( Top View )  
1
2
3
4
8
7
6
5
GND  
FLG1  
OUT1  
OUT2  
FLG2  
1
2
8
7
6
FLG1  
OUT1  
OUT2  
FLG2  
GND  
IN  
IN  
3
4
EN1  
EN2  
EN1  
EN2  
5
MSOP-8L-EP  
SOP-8L  
Pin Descriptions  
Pin  
Number  
Pin Name  
Descriptions  
GND  
IN  
1
Ground  
Voltage input pin  
2
3
4
EN1  
EN2  
Switch 1 enable input, active low (AP2162) or active high (AP2172)  
Switch 2 enable input, active low (AP2162) or active high (AP2172)  
Switch 2 over-current and over-temperature fault report; open-drain flag is active  
low when triggered  
FLG2  
5
OUT2  
OUT1  
6
7
Switch 2 voltage output pin  
Switch 1 voltage output pin  
Switch 1 over-current and over-temperature fault report; open-drain flag is active  
low when triggered  
FLG1  
8
AP2162/AP2172 Rev. 1  
2 of 17  
OCTOBER 2008  
www.diodes.com  
© Diodes Incorporated  
AP2162/AP2172  
1A DUAL CHANNEL CURRENT-LIMITED POWER  
SWITCH  
Functional Block Diagram  
FLG 1  
Therm al  
Sense  
AP2162, A P2172  
D eglitch  
C urrent  
Lim it  
EN 1  
D river  
G N D  
U VLO  
C urrent  
Sense  
O U T1  
IN  
C urrent  
Sense  
O U T2  
U VLO  
FLG 2  
C urrent  
Lim it  
D river  
EN 2  
D eglitch  
Therm al  
Sense  
G N D  
Typical Application Circuit  
AP2172 Enable Active High  
Power Supply  
2.7V to 5.5V  
Load  
Load  
IN  
OUT1  
OUT2  
0.1uF  
0.1uF  
68uF  
68uF  
0.1uF  
10k  
10uF  
ON  
10k  
FLG1  
FLG2  
EN1  
EN2  
GND  
OFF  
Available Options  
Part Number  
Recommended  
Maximum Continuous  
Load Current  
Current Limit  
(Typical)  
Channel  
Enable Pin (EN)  
AP2162  
AP2172  
2
2
Active Low  
Active High  
1.5A  
1.5A  
1.0A  
1.0A  
AP2162/AP2172 Rev. 1  
3 of 17  
OCTOBER 2008  
www.diodes.com  
© Diodes Incorporated  
AP2162/AP2172  
1A DUAL CHANNEL CURRENT-LIMITED POWER  
SWITCH  
Absolute Maximum Ratings  
Symbol  
ESD HBM  
ESD MM  
VIN  
Parameter  
Ratings  
Units  
KV  
V
Human Body Model ESD Protection  
Machine Model ESD Protection  
Input Voltage  
3
300  
6.5  
V
V
VOUT  
Output Voltage  
VIN + 0.3  
6.5  
VEN , VFLG  
Iload  
Enable Voltage  
V
A
Maximum Continuous Load Current  
Maximum Junction Temperature  
Storage Temperature Range  
Internal Limited  
150  
TJmax  
°C  
°C  
TST  
-65 ~ 150  
Recommended Operating Conditions  
Symbol  
VIN  
Parameter  
Min  
Max  
5.5  
1.0  
85  
Units  
V
A
Input voltage  
Output Current  
2.7  
0
-40  
IOUT  
TA  
Operating Ambient Temperature  
°C  
AP2162/AP2172 Rev. 1  
4 of 17  
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OCTOBER 2008  
© Diodes Incorporated  
AP2162/AP2172  
1A DUAL CHANNEL CURRENT-LIMITED POWER  
SWITCH  
Electrical Characteristics  
(TA = 25oC, VIN = +5.0V, unless otherwise stated)  
Symbol  
VUVLO  
ISHDN  
IQ  
Parameter  
Input UVLO  
Input Shutdown Current  
Input Quiescent Current, Dual Enabled, IOUT= 0  
Test Conditions  
Rload=1kΩ  
Disabled, IOUT= 0  
Min Typ. Max Unit  
1.6  
1.9  
0.5  
100 160  
2.5  
1
V
μA  
μA  
μA  
μA  
ILEAK Input Leakage Current  
IREV Reverse Leakage Current  
Disabled, OUT grounded  
Disabled, VIN = 0V, VOUT = 5V, IREV at VIN  
1
1
MSOP-8L-EP  
SOP-8L  
VIN = 5V, IOUT= 0.5A,  
115 150 mΩ  
120 160 mΩ  
140 180 mΩ  
-40oC≤ TA ≤85oC  
RDS(ON) Switch on-resistance  
VIN = 3.3V, IOUT= 0.5A, -40oC≤ TA ≤85oC  
Enabled into short circuit, CL=68μF  
ISHORT Short-circuit current limit  
ILIMIT Over-Load Current Limit  
1.4  
A
VIN = 5V, VOUT = 4.6V, CL=68μF, -40oC≤  
1.1  
2
1.5  
1.9  
A
TA ≤85oC  
VIN = VEN, Output Current Slew rate  
(<100A/s), CL=68μF  
VIN = 2.7V to 5.5V  
Current limiting trigger  
threshold  
EN Input Logic Low Voltage  
ITrig  
2.4  
A
VIL  
VIH  
ISINK  
0.8  
1
V
V
EN Input Logic High Voltage VIN = 2.7V to 5.5V  
EN Input leakage  
VEN = 5V  
μA  
ms  
ms  
ms  
ms  
Ω
ms  
°C  
°C  
TD(ON) Output turn-on delay time  
TR Output turn-on rise time  
TD(OFF) Output turn-off delay time  
TF Output turn-off fall time  
RFLG FLG output FET on-resistance IFLG =10mA  
TBlank FLG blanking time  
0.05  
0.6  
0.01  
0.05 0.1  
30  
7
CL=1μF, Rload=10Ω  
CL=1μF, Rload=10Ω  
CL=1μF, Rload=10Ω  
CL=1μF, Rload=10Ω  
1.5  
50  
15  
4
CIN=10μF, CL=68μF  
Enabled, Rload=1kΩ  
TSHDN Thermal shutdown threshold  
THYS Thermal shutdown hysteresis  
140  
25  
SOP-8L (Note 3)  
110  
60  
oC/W  
oC/W  
Thermal Resistance  
θJA  
Junction-to-Ambient  
MSOP-8L-EP (Note 4)  
Notes: 3. Test condition for SOP-8L: Device mounted on FR-4 2-layer board, 2oz copper, with minimum recommended pad layout.  
4. Test condition for MSOP-8L-EP: Device mounted on FR-4 2-layer board, 2oz copper, with minimum recommended pad on top layer and 3  
vias to bottom layer ground plane.  
AP2162/AP2172 Rev. 1  
5 of 17  
OCTOBER 2008  
www.diodes.com  
© Diodes Incorporated  
AP2162/AP2172  
1A DUAL CHANNEL CURRENT-LIMITED POWER  
SWITCH  
Typical Performance Characteristics  
VEN  
VEN  
50%  
50%  
50%  
50%  
TD(OFF)  
TD(OFF)  
TR  
TR  
TF  
TF  
TD(ON)  
TD(ON)  
90%  
90%  
90%  
90%  
VOUT  
VOUT  
10%  
10%  
10%  
10%  
Figure 1. Voltage Waveforms: AP2162 (left), AP2172 (right)  
All Enable Plots are for AP2172 Active High  
Channel 1 Turn-On Delay and Rise Time  
Channel 1 Turn-Off Delay and Fall Time  
Ven 1  
5V/div  
Ven 1  
5V/div  
C =1uF  
L
Vout 1  
2V/div  
Vout 1  
2V/div  
T
=25°C  
A
R =10ꢀ  
L
C =1uF  
L
T
=25°C  
A
R =10ꢀ  
L
500us/div  
500us/div  
Channel 2 Turn-Off Delay and Fall Time  
Channel 2 Turn-On Delay and Rise Time  
Ven 2  
5V/div  
Ven 2  
5V/div  
C =1uF  
L
Vout 2  
2V/div  
Vout 2  
2V/div  
T
=25°C  
A
R =10ꢀ  
L
C =1uF  
L
T
=25°C  
A
R =10ꢀ  
L
500us/div  
500us/div  
AP2162/AP2172 Rev. 1  
6 of 17  
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OCTOBER 2008  
© Diodes Incorporated  
AP2162/AP2172  
1A DUAL CHANNEL CURRENT-LIMITED POWER  
SWITCH  
Typical Performance Characteristics  
(Continued)  
Channel 1 Turn-On Delay and Rise Time  
Channel 1 Turn-Off Delay and Fall Time  
Ven 1  
5V/div  
Ven 1  
5V/div  
C =100uF  
L
T
=25°C  
A
Vout 1  
2V/div  
Vout 1  
2V/div  
R =10ꢀ  
L
C =100uF  
L
T
=25°C  
A
R =10ꢀ  
L
500us/div  
Channel 2 Turn-Off Delay and Fall Time  
500us/div  
Channel 2 Turn-On Delay and Rise Time  
Ven 2  
5V/div  
Ven 2  
5V/div  
C =100uF  
L
T
=25°C  
A
Vout 2  
2V/div  
Vout 2  
2V/div  
R =10ꢀ  
L
C =100uF  
L
T
=25°C  
A
R =10ꢀ  
L
500us/div  
500us/div  
Channel 1 Short Circuit Current,  
Device Enabled Into Short  
Channel 2 Short Circuit Current,  
Device Enabled Into Short  
Ven 1  
5V/div  
Ven 2  
5V/div  
Iout 1  
500mA/di  
v
Iout 2  
500mA/di  
v
V
=5V  
IN  
V
=5V  
IN  
T
=25°C  
T =25°C  
A
A
C =68uF  
L
C =68uF  
L
500us/div  
500us/div  
AP2162/AP2172 Rev. 1  
7 of 17  
www.diodes.com  
OCTOBER 2008  
© Diodes Incorporated  
AP2162/AP2172  
1A DUAL CHANNEL CURRENT-LIMITED POWER  
SWITCH  
Typical Performance Characteristics  
(Continued)  
Channel 1 Inrush Current  
Channel 2 Inrush Current  
Ven 1  
5V/div  
Ven 2  
5V/div  
C =100u  
F
C =100u  
F
L
L
V
=5V  
IN  
V
=5V  
IN  
T
=25°C  
T =25°C  
A
A
R =3ꢀ  
L
R =3ꢀ  
L
Iout 1  
500mA/di  
v
Iout 2  
500mA/di  
v
C =470u  
L
F
C =470u  
L
F
C =220u  
L
F
C =220u  
L
F
1ms/div  
1ms/div  
Channel 1  
Channel 1  
1 Ω Load Connected to Enabled Device  
2Ω Load Connected to Enabled Device  
V
=5V  
IN  
V
=5V  
IN  
T
=25°C  
T =25°C  
A
A
Vflag 1  
2V/div  
Vflag 1  
2V/div  
C =68uF  
C =68uF  
L
L
Iout 1  
Iout 1  
1A/div  
1A/div  
2ms/div  
2ms/div  
Channel 2  
Channel 2  
1 Ω Load Connected to Enabled Device  
2Ω Load Connected to Enabled Device  
V
=5V  
IN  
V
=5V  
IN  
T
=25°C  
T =25°C  
A
A
Vflag 2  
2V/div  
Vflag 2  
2V/div  
C =68uF  
C =68uF  
L
L
Iout 2  
Iout 2  
1A/div  
1A/div  
2ms/div  
2ms/div  
AP2162/AP2172 Rev. 1  
8 of 17  
www.diodes.com  
OCTOBER 2008  
© Diodes Incorporated  
AP2162/AP2172  
1A DUAL CHANNEL CURRENT-LIMITED POWER  
SWITCH  
Typical Performance Characteristics  
(Continued)  
Channel 1  
Channel 2  
Short Circuit with Blanking Time and Recovery  
Short Circuit with Blanking Time and Recovery  
Vout  
Vout  
5V/div  
5V/div  
V
=5V  
IN  
V
=5V  
IN  
T
=25°C  
T =25°C  
A
A
C =68uF  
L
C =68uF  
L
Iout  
Vflag  
500mA/di  
v
5V/div  
Iout  
Iout  
1A/div  
1A/div  
20ms/div  
20ms/div  
Channel 1 Power On  
Channel 2 Power On  
Vflag  
5V/div  
Vflag  
5V/div  
Iout  
500mA/di  
v
Iout  
500mA/di  
v
T
=25°C  
T =25°C  
A
A
C =68uF  
C =68uF  
L
L
R =5ꢀ  
L
R =5ꢀ  
L
Ven  
Ven  
5V/div  
5V/div  
Vin  
Vin  
5V/div  
5V/div  
1ms/div  
1ms/div  
Channel 1 UVLO Increasing  
Channel 1 UVLO Decreasing  
T
=25°C  
A
C =68uF  
L
Vin  
2V/div  
Vin  
2V/div  
R =5ꢀ  
L
T
=25°C  
A
C =68uF  
L
R =5ꢀ  
L
Iout  
Iout  
500mA/di  
v
500mA/di  
v
10ms/div  
1ms/div  
AP2162/AP2172 Rev. 1  
9 of 17  
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OCTOBER 2008  
© Diodes Incorporated  
AP2162/AP2172  
1A DUAL CHANNEL CURRENT-LIMITED POWER  
SWITCH  
Typical Performance Characteristics  
(Continued)  
Channel 2 UVLO Increasing  
Channel 2 UVLO Decreasing  
T
=25°C  
A
C =68uF  
L
Vin  
2V/div  
Vin  
2V/div  
R =5ꢀ  
L
T
=25°C  
A
C =68uF  
L
R =5ꢀ  
L
Iout  
Iout  
500mA/di  
v
500mA/di  
v
10ms/div  
1ms/div  
Channel 1 Enabled and Shorted with Channel 2  
Disabled  
Channel 1 Disabled and Channel 2 Enabled  
Vout 1  
5V/div  
Ven1  
5V/div  
Vout 2  
5V/div  
Vout 1  
5V/div  
Vflag 1  
5V/div  
Ven2  
5V/div  
T
=25°C  
T =25°C  
A
A
C =68uF  
L
C =68uF  
L
Iout 2  
500mA/di  
v
Vout 2  
5V/div  
50ms/div  
100ms/div  
Turn-On Time vs Input Voltage  
Turn-Off Time vs Input Voltage  
750  
700  
650  
600  
550  
500  
450  
400  
350  
300  
30  
29  
29  
28  
28  
27  
27  
26  
26  
25  
C =1uF  
L
R =10ꢀ  
L
T
=25°C  
A
C =1uF  
L
R =10ꢀ  
L
T
=25°C  
A
250  
1.5  
1.5  
2
2.5  
3
3.5  
4
4.5  
5
5.5  
6
2
2.5  
3
3.5  
4
4.5  
5
5.5  
6
Input Voltage (V)  
Input Voltage (V)  
AP2162/AP2172 Rev. 1  
10 of 17  
www.diodes.com  
OCTOBER 2008  
© Diodes Incorporated  
AP2162/AP2172  
1A DUAL CHANNEL CURRENT-LIMITED POWER  
SWITCH  
Typical Performance Characteristics  
(Continued)  
Rise Time vs Input Voltage  
Fall Time vs Input Voltage  
650  
600  
550  
500  
450  
400  
350  
300  
250  
22  
22  
21  
21  
20  
20  
19  
C =1uF  
L
C =1uF  
L
R =10ꢀ  
L
R =10ꢀ  
L
T
=25°C  
T
=25°C  
A
A
2
2.5  
3
3.5  
4
4.5  
5
5.5  
6
2
2.5  
3
3.5  
4
4.5  
5
5.5  
6
Input Voltage (V)  
Input Voltage (V)  
Supply Current, Output Enabled vs Ambient Temperature  
Supply Current, Output Disabled vs Ambient Temperature  
68  
63  
58  
53  
48  
43  
38  
33  
28  
Vin=5.5V  
0.8  
0.7  
0.6  
0.5  
0.4  
0.3  
0.2  
0.1  
0.0  
Vin=5.0V  
Vin=3.3V  
Vin=5.0V  
Vin=5.5V  
Vin=3.3V  
Vin=2.7V  
Vin=2.7V  
-60  
-40  
-20  
0
20  
40  
60  
80  
100  
-60  
-40  
-20  
0
20  
40  
60  
80  
100  
Ambient Temperature (°C)  
Ambient Temperature (°C)  
Static Drain-Source On-State Resistance vs Ambient  
Temperature  
Short-Circuit Output Current vs Ambient Temperature  
1.56  
1.55  
1.54  
1.53  
1.52  
1.51  
1.50  
1.49  
1.48  
1.47  
1.46  
1.45  
170  
160  
150  
140  
130  
120  
110  
100  
90  
C =100uF  
L
Vin=3.3V  
Vin=2.7V  
Vin=2.7V  
Vin=5.0V  
Vin=3.3V  
Vin=5V  
Vin=5.5V  
80  
80  
-60  
-40  
-20  
0
20  
40  
60  
80  
100  
-60  
-40  
-20  
0
20  
40  
60  
100  
Ambient Temperature (°C)  
Ambient Temperature (°C)  
AP2162/AP2172 Rev. 1  
11 of 17  
OCTOBER 2008  
www.diodes.com  
© Diodes Incorporated  
AP2162/AP2172  
1A DUAL CHANNEL CURRENT-LIMITED POWER  
SWITCH  
Typical Performance Characteristics  
(Continued)  
Undervoltage Lockout vs Ambient Temperature  
Threshold Trip Current vs Input Voltage  
2.20  
2.10  
2.00  
1.90  
1.80  
1.70  
1.60  
1.99  
1.98  
1.97  
1.96  
1.95  
1.94  
1.93  
1.92  
1.91  
1.90  
1.89  
1.88  
UVLO Rising  
UVLO Falling  
T
=25°C  
A
C =68uF  
L
2.8  
3.3  
3.8  
4.3  
4.8  
5.3  
-60  
-40  
-20  
0
20  
40  
60  
80  
100  
Input Voltage (V)  
Ambient Temperature (°C)  
Current Limit Response vs Peak Current  
120  
100  
80  
60  
40  
20  
0
V
=5V  
IN  
T
=25°C  
A
0
2
4
6
8
10  
12  
Peak Current (A)  
AP2162/AP2172 Rev. 1  
12 of 17  
OCTOBER 2008  
www.diodes.com  
© Diodes Incorporated  
AP2162/AP2172  
1A DUAL CHANNEL CURRENT-LIMITED POWER  
SWITCH  
Application Note  
Power Supply Considerations  
A 0.01-μF to 0.1-μF X7R or X5R ceramic bypass capacitor between IN and GND, close to the device, is  
recommended. Placing a high-value electrolytic capacitor on the input and output pin(s) is recommended  
when the output load is heavy. This precaution reduces power-supply transients that may cause ringing on  
the input. Additionally, bypassing the output with a 0.01-μF to 0.1-μF ceramic capacitor improves the  
immunity of the device to short-circuit transients.  
Over-current and Short Circuit Protection  
An internal sensing FET is employed to check for over-current conditions. Unlike current-sense resistors,  
sense FETs do not increase the series resistance of the current path. When an overcurrent condition is  
detected, the device maintains a constant output current and reduces the output voltage accordingly.  
Complete shutdown occurs only if the fault stays long enough to activate thermal limiting.  
Three possible overload conditions can occur. In the first condition, the output has been shorted to GND  
before the device is enabled or before VIN has been applied. The AP2162/AP2172 senses the short circuit  
and immediately clamps output current to a certain safe level namely ILIMIT  
.
In the second condition, an output short or an overload occurs while the device is enabled. At the instance  
the overload occurs, higher current may flow for a very short period of time before the current limit function  
can react. After the current limit function has tripped (reached the over-current trip threshold), the device  
switches into current limiting mode and the current is clamped at ILIMIT  
.
In the third condition, the load has been gradually increased beyond the recommended operating current.  
The current is permitted to rise until the current-limit threshold (ITRIG) is reached or until the thermal limit of  
the device is exceeded. The AP2162/AP2172 is capable of delivering current up to the current-limit threshold  
without damaging the device. Once the threshold has been reached, the device switches into its current  
limiting mode and is set at ILIMIT  
.
FLG Response  
When an over-current or over-temperature shutdown condition is encountered, the FLG open-drain output  
goes active low after a nominal 7-ms deglitch timeout. The FLG output remains low until both over-current  
and over-temperature conditions are removed. Connecting a heavy capacitive load to the output of the  
device can cause a momentary over-current condition, which does not trigger the FLG due to the 7-ms  
deglitch timeout. The AP2162/AP2172 is designed to eliminate false over-current reporting without the need  
of external components to remove unwanted pulses.  
Power Dissipation and Junction Temperature  
The low on-resistance of the internal MOSFET allows the small surface-mount packages to pass large  
current. Using the maximum operating ambient temperature (TA) and RDS(ON), the power dissipation can be  
calculated by:  
PD = RDS(ON)× I2  
Finally, calculate the junction temperature:  
TJ = PD x RθJA + TA  
Where:  
TA= Ambient temperature °C  
RθJA = Thermal resistance  
PD = Total power dissipation  
AP2162/AP2172 Rev. 1  
13 of 17  
OCTOBER 2008  
www.diodes.com  
© Diodes Incorporated  
AP2162/AP2172  
1A DUAL CHANNEL CURRENT-LIMITED POWER  
SWITCH  
Application Note (Continued)  
Thermal Protection  
Thermal protection prevents the IC from damage when heavy-overload or short-circuit faults are present for  
extended periods of time. The AP2162/AP2172 implements a thermal sensing to monitor the operating  
junction temperature of the power distribution switch. Once the die temperature rises to approximately 140°C  
due to excessive power dissipation in an over-current or short-circuit condition the internal thermal sense  
circuitry turns the power switch off, thus preventing the power switch from damage. Hysteresis is built into  
the thermal sense circuit allowing the device to cool down approximately 25°C before the switch turns back  
on. The switch continues to cycle in this manner until the load fault or input power is removed. The  
FLG open-drain output is asserted when an over-temperature shutdown or over-current occurs with 7-ms  
deglitch.  
Under-voltage Lockout (UVLO)  
Under-voltage lockout function (UVLO) keeps the internal power switch from being turned on until the power  
supply has reached at least 1.9V, even if the switch is enabled. Whenever the input voltage falls below  
approximately 1.9V, the power switch is quickly turned off. This facilitates the design of hot-insertion systems  
where it is not possible to turn off the power switch before input power is removed.  
Host/Self-Powered HUBs  
Hosts and self-powered hubs (SPH) have a local power supply that powers the embedded functions and the  
downstream ports (see Figure 2). This power supply must provide from 5.25V to 4.75V to the board side of  
the downstream connection under both full-load and no-load conditions. Hosts and SPHs are required to  
have current-limit protection and must report over-current conditions to the USB controller. Typical SPHs are  
desktop PCs, monitors, printers, and stand-alone hubs.  
Power Supply  
3.3V 5V  
Downstream  
USB Ports  
D+  
D-  
VBUS  
AP2162  
OUT1  
2
7
IN  
0.1uF  
0.1uF  
0.1uF  
68uF  
68uF  
GND  
8
3
FLG1  
EN1  
D+  
D-  
VBUS  
USB  
Controller  
5
4
FLG2  
EN2  
6
OUT1  
GND  
1
GND  
Figure 2. Typical Two-Port USB Host / Self-Powered Hub  
Generic Hot-Plug Applications  
In many applications it may be necessary to remove modules or pc boards while the main unit is still  
operating. These are considered hot-plug applications. Such implementations require the control of current  
surges seen by the main power supply and the card being inserted. The most effective way to control these  
surges is to limit and slowly ramp the current and voltage being applied to the card, similar to the way in  
which a power supply normally turns on. Due to the controlled rise times and fall times of the  
AP2162/AP2172, these devices can be used to provide a softer start-up to devices being hot-plugged into a  
powered system. The UVLO feature of the AP2162/AP2172 also ensures that the switch is off after the card  
has been removed, and that the switch is off during the next insertion.  
By placing the AP2162/AP2172 between the VCC input and the rest of the circuitry, the input power reaches  
these devices first after insertion. The typical rise time of the switch is approximately 1ms, providing a slow  
AP2162/AP2172 Rev. 1  
14 of 17  
OCTOBER 2008  
www.diodes.com  
© Diodes Incorporated  
AP2162/AP2172  
1A DUAL CHANNEL CURRENT-LIMITED POWER  
SWITCH  
voltage ramp at the output of the device. This implementation controls system surge current and provides a  
hot-plugging mechanism for any device.  
Marking Information  
(1) SOP-8L  
(Top view)  
8
7
6
5
4
Logo  
Part Number  
6 : Active Low  
7 : Active High  
2 : 2 Channel  
AP21X X  
YY XX  
G : Green  
Internal Code  
Xth week : 01~52  
X X  
Year :  
"07" = 2007  
"08" = 2008  
2
3
1
(2) MSOP-8L-EP  
( Top view )  
8
1
7
6
5
A~Z : Green  
Logo  
Y M X  
Month : A~L=01~12  
Year :  
"7" = 2007  
"8" = 2008  
Part Number  
AP21X X  
6 : Active Low  
7 : Active High  
2 : 2 Channel  
2
3
4
AP2162/AP2172 Rev. 1  
15 of 17  
www.diodes.com  
OCTOBER 2008  
© Diodes Incorporated  
AP2162/AP2172  
1A DUAL CHANNEL CURRENT-LIMITED POWER  
SWITCH  
Package Information ( All Dimensions in mm )  
(1) SOP-8L  
Gauge Plane  
Seating Plane  
0.38/1.27  
Detail "A"  
7°~9°  
7°~9°  
0.35max.  
45°  
Detail "A"  
0.3/0.5  
3.70/4.10  
1.27typ  
0.78  
4.80/5.30  
8x-0.41  
6x-1.27  
Land Pattern Recommendation  
(Unit: mm)  
(2) MSOP-8L-EP  
1.65/1.95  
"A"  
EXPOSED PAD  
(BOTTOM)  
1
1
0.3  
0.65Bsc.  
2.9/3.0  
Gauge plane  
0.4/0.8  
0.95Ref.  
DETAIL "A"  
0.05  
1
EXPOSED PAD  
(BOTTOM)  
8x-0.32  
6x-0.65  
Land Pattem Recommendation  
(Unit:mm)  
AP2162/AP2172 Rev. 1  
16 of 17  
OCTOBER 2008  
www.diodes.com  
© Diodes Incorporated  
AP2162/AP2172  
1A DUAL CHANNEL CURRENT-LIMITED POWER  
SWITCH  
IMPORTANT NOTICE  
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further  
notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither  
does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will  
agreeto hold Diodes Incorporatedand all the companies whose productsare represented onour website, harmless against all damages.  
LIFE SUPPORT  
Diodes Incorporated products are notauthorizedfor use as criticalcomponents in lifesupportdevices or systemswithout theexpressed written approval ofthe  
PresidentofDiodes Incorporated.  
AP2162/AP2172 Rev. 1  
17 of 17  
OCTOBER 2008  
www.diodes.com  
© Diodes Incorporated  

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