AT1601
Preliminary Product Information
USB High-Side Power Switches with Flag
Features
•Built-In (Typical 110mΩ at 5.0V)
N-Channel MOSFET
•Output can be Forced Higher Than Input
(Off-State)
• Low Supply Current
100µA Typical On-State Current
1µA Typical Off-State Current
•1A minimum Continuous Load Current
•1.4A Typical Current Limit
•Open-Drain Fault Flag Output
•Hot Plug-In Application(Soft-Start)
•1.8V to 5.5V Operating Range
•1.7V Under-Voltage-Lockout(UVLO)
•Thermal Shutdown Protection
•SOP8 Package
General Description
The AT1601 is an integrated high-side power
switch optimized for self-powered and bus-
powered Universal Serial Bus (USB) applications.
With built-in a charge pump circuitry to drive the
internal MOSFET switch, the switch’s low on-
resistance meets USB voltage drop requirements.
A flag output is available to indicate fault
conditions to the local USB controller.
The AT1601 includes soft-start to limit inrush
current during plug-in, 1.4A current limit to limit
the output current to a safe level which meet the
UL 25VA safety requirements, thermal shutdown
to prevent catastrophic switch failure from high-
current loads, under voltage lockout (UVLO) to
ensure that the device remains off unless there is a
valid input voltage present, and an enable input
that is compatible with both 3.3V and 5V logic.
Applications
•High-Side Power Protection Switch
•USB Power Management
•Notebook, Motherboard PCs
System Block
Aimtron reserves the right without notice to change this circuitry and specifications.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
1
AT1601
Preliminary Product Information
USB High-Side Power Switches with Flag
Ordering Information
Part Number
AT1601A
AT1601A_GRE
AT1601B
AT1601B_GRE
Package
SOP8
SOP8,Green
SOP8
SOP8,Green
Marking
AT1601AS
AT1601AS,date code with one bottom line
AT1601BS
AT1601BS,date code with one bottom line
EN
Active
High
Active
Low
Pin Assignment
Pin Description
Pin No.
Symbol
I/O
Description
1
2
3
4,5
7
6,8
EN
FLG
GND
NC
IN
OUT
I
O
P
-
P
P
Enable Input: AT1601A high active, AT1601B low active
Open-Drain Fault Flag Output
Ground
Input Power
Switch Output
Absolute Maximum Ratings
Item
Symbol
Ratings
Units
Storage temperature
Operating temperature
IN,OUT,FLG,EN input voltage
FLG Current
OUT Current
ESD Protection *
Thermal Resistance
Lead Temperature(Soldering. 10sec.)
T
STG
T
OPR
I
FLG
I
OUT
(Human Body Mode)
θJA
-55〜＋150
-30〜＋85
-0.3〜＋6.5
50
Internal Limited
2
160
260
℃
℃
V
mA
A
KV
°C/W
°C
*Devices are ESD protected, handling precaution are recommended.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
2
AT1601
Preliminary Product Information
USB High-Side Power Switches with Flag
Recommended Operating Ratings
Item
Symbol
Ratings
Units
Operating temperature
IN input voltage
EN input voltage
T
OPR
-20〜＋85
1.8〜5.5
0〜5.5
℃
V
V
Electrical Characteristics
(VIN=5.0V, Ta=+25
0
C)
Values
Parameter
Symbol
Condition
Min.
Switch Off, OUT=Open
VIN=5.0V
Switch Off, OUT=Open
VIN=3.3V
Switch On, OUT=Open
VIN=5.0V
Switch On, OUT=Open
VIN=3.3V
Low to High Transition
High to Low Transition
EN=2.5V
EN=1.0V
-
-
-
-
-
0.4*VCC
-
-
1.5
-
-
-
1.0
-
-
-
-
Typ.
1
1
120
100
-
-
0.01
0.01
1.7
0.1
110
130
1.4
1.0
1
1
200
Max.
8
5
160
120
0.5*VCC
-
1
1
-
-
140
180
2.0
-
10
10
-
µA
µA
µA
µA
V
V
µA
µA
V
V
mΩ
mΩ
A
A
µA
µA
µs
Unit
Input Supply Current
I
IN1
Input Supply Current
I
IN2
V
OH
EN Enable Threshold
V
OL
I
EN
EN Input Current
UVLO Threshold
UVLO Hysteresis
Switch Resistance
Short Circuit Current
Limit
Short Circuit FoldBack
Current
OUT Leakage Current
OUT Turn-On Delay
V
UVLO
IN rising
∆
UVLO
IN Falling
R
ON
I
Limit
I
SC
AT1601A
AT1601B
tOn-D
IN=5V, I
OUT
=500mA
IN=3.3V, I
OUT
=500mA
Enable into Load,
R
LOAD
=1Ω
R
LOAD
=0Ω, measure prior to
thermal shutdown
I
leakage
EN=0, R
LOAD
=0Ω
I
leakage
EN=IN, R
LOAD
=0Ω
R
LOAD
=10Ω
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
3
AT1601
Preliminary Product Information
USB High-Side Power Switches with Flag
OUT Turn-On Rise
Time
OUT Turn-Off Delay
OUT Turn-Off Fall
Time
FLG Output Resistance
FLG Off Current
FLG Delay Time
tOn-R
tOff-D
tOff-F
R
LOAD
=10Ω, C
LOAD
=100µF
R
LOAD
=10Ω
R
LOAD
=10Ω, C
LOAD
=100µF
IN=5V, I
FLG
=10mA
IN=3.3V, I
FLG
=10mA
-
-
-
-
-
-
8
0.3
5
0.3
10
15
0.01
12
-
20
-
25-
40
1
15
ms
µs
ms
Ω
Ω
µA
ms
R
FLG
I
FLGL
FLG=IN
t
FLGL
From fault to FLG assertion
* For AT1601A, off is
≤2.0V
and on is
≥2.5V.
For AT1601B, off is
≥2.5V
and on is
≤2.0V.(IN=5V)
Application Circuit
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
4
AT1601
Preliminary Product Information
USB High-Side Power Switches with Flag
Typical Characteristics
(VIN=5V,TA=25℃,AT1601A.)
CH1:EN CH2:FLG CH4:I
OUT
FLG Delay waveform
CH1:EN CH2:FLG CH3:V
OUT
CH4:I
OUT
Short Circuit Response
CH1:EN CH2:FLG CH3:V
OUT
Turn-on Delay waveform
CH1:EN CH2:FLG CH3:V
OUT
Turn-off Delay waveform
CH1:EN CH2:FLG CH3:V
out
CH4:V
IN
Power UP (UVLO)
CH1:EN CH2:FLG CH3:V
out
CH4:V
IN
Power Down (UVLO)
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
5
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