RT9715
90mΩ, 2A/1.5A/1.1A/0.7A High-Side Power Switches
Ω
with Flag
General Description
The RT9715 is a cost-effective, low-voltage, single
N-MOSFET high-side Power Switch IC for USB application.
Low switch-on resistance (typ. 90mΩ) and low supply
current (typ. 50uA) are realized in this IC.
The RT9715 integrates an over-current protection circuit,
a short fold back circuit, a thermal shutdown circuit and an
under-voltage lockout circuit for overall protection. Besides,
a flag output is available to indicate fault conditions to the
local USB controller. Furthermore, the chip also integrates
an embedded delay function to prevent miss-operation from
happening due to inrush-current. The RT9715 is an ideal
solution for USB power supply and can support flexible
applications since it is available in various packages such
as SOT-23-5, SOP-8, MSOP-8 and WDFN-8L 3x3.
Features
Ω
90mΩ (typ.) N-MOSFET Switch
Operating Range : 2.7V to 5.5V
Reverse Blocking Current
Under Voltage Lockout
Deglitched Fault Report (FLG)
Thermal Protection with Foldback
Over Current Protection
Short Circuit Protection
UL Approved
−
E219878
Nemko Approved
−
NO49621
RoHS Compliant and Halogen Free
Applications
USB Peripherals
Notebook PCs
Ordering Information
RT9715
Pin Configurations
Package Type
B : SOT-23-5
BG : SOT-23-5 (G-Type)
BR : SOT-23-5 (R-Type)
S : SOP-8
F : MSOP-8
QW : WDFN-8L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Output Current/EN Function
A : 2A/Active High
B : 2A/Active Low
C : 1.5A/Active High
D : 1.5A/Active Low
E : 1.1A/Active High
F : 1.1A/Active Low
G : 0.7A/Active High
H : 0.7A/Active Low
(TOP VIEW)
VIN
5
2
EN/EN
4
3
VIN
5
2
EN/EN
4
3
VOUT GND FLG
VOUT GND NC
SOT-23-5
VOUT
5
2
SOT-23-5 (G-Type)
VIN
4
3
GND
VIN
VIN
EN/EN
2
3
4
8
7
6
5
VOUT
VOUT
VOUT
FLG
FLG GND EN/EN
SOT-23-5 (R-Type)
SOP-8/MSOP-8
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
2
3
4
WDFN-8L 3x3
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
DS9715-03 April 2011
GND
Note :
GND
VIN
VIN
EN/EN
1
9
8
7
6
5
VOUT
VOUT
VOUT
FLG
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1
RT9715
Typical Application Circuit
Pull-Up Resistor (10K to 100K)
USB Controller
Supply Voltage
2.7V to 5.5V
C
IN
1uF
RT9715A/C/E/G
Chip Enable
VIN
RT9715
VOUT
C
OUT
10uF
V
BUS
D+
D-
GND
FLG
Over -Current
EN/EN
+
150uF
GND
RT9715B/D/F/H
Chip Enable
Ferrite
Beads
Data
Note :
A low-ESR 150uF aluminum electrolytic or tantalum between V
OUT
and GND is strongly recommended to meet
the 330mV maximum droop requirement in the hub V
BUS
. (see Application Information Section for further details)
Functional Pin Description
Pin No.
SOT-23-5
1
2
3
4
5
--
--
SOT-23-5 SOT-23-5
(G-Type) (R-Type)
1
2
--
4
5
3
--
5
2
1
3
4
--
--
SOP-8 / WDFN-8L Pin Name
MSOP-8
6 , 7,8
1
5
4
2,3
--
--
3X3
6,7,8
1
5
4
2,3
--
9 (Exposed
Pad)
VOUT
GND
FLG
EN/EN
VIN
NC
Output Voltage.
Ground.
Fault FLAG Output.
Chip Enable (Active High/Low).
Power Input Voltage.
No Internal Connection.
The exposed pad must be soldered to a large
PCB and connected to GND for maximum
power dissipation.
Pin Function
Function Block Diagram
VIN
EN/EN
Bias
UVLO
Current
Limiting
Gate
Control
Output Voltage
Detection
Thermal
Protection
Auto Discharge
FLG
Delay
GND
VOUT
Oscillator
Charge
Pump
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2
DS9715-03 April 2011
RT9715
Absolute Maximum Ratings
(Note 1)
Supply Input Voltage, V
IN
-------------------------------------------------------------------------------------------- 6V
EN Voltage --------------------------------------------------------------------------------------------------------------
−0.3V
to 6V
FLAG Voltage ---------------------------------------------------------------------------------------------------------- 6V
Power Dissipation, P
D
@ T
A
= 25°C
SOT-23-5 ---------------------------------------------------------------------------------------------------------------- 300mW
SOP-8 -------------------------------------------------------------------------------------------------------------------- 469mW
MSOP-8 ----------------------------------------------------------------------------------------------------------------- 469mW
WDFN-8L 3x3 ---------------------------------------------------------------------------------------------------------- 694mW
Package Thermal Resistance (Note 2)
SOT-23-5,
θ
JA
----------------------------------------------------------------------------------------------------------- 250°C/W
SOP-8,
θ
JA
-------------------------------------------------------------------------------------------------------------- 160°C/W
MSOP-8,
θ
JA
------------------------------------------------------------------------------------------------------------ 160°C/W
WDFN-8L 3x3,
θ
JA
----------------------------------------------------------------------------------------------------- 108°C/W
Junction Temperature ------------------------------------------------------------------------------------------------- 150°C
Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260°C
Storage Temperature Range ----------------------------------------------------------------------------------------
−65°C
to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV
MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions
(Note 4)
Supply Input Voltage, V
IN
-------------------------------------------------------------------------------------------- 2.7V to 5.5V
EN Voltage -------------------------------------------------------------------------------------------------------------- 0V to 5.5V
Junction Temperature Range ----------------------------------------------------------------------------------------
−40°C
to 100°C
Ambient Temperature Range ----------------------------------------------------------------------------------------
−40°C
to 85°C
Electrical Characteristics
(V
IN
= 5V, C
IN
= 1uF, C
OUT
= 10uF, T
A
= 25°C, unless otherwise specified)
Parameter
Input Quiescent Current
Input Shutdown Current
Switch On
Resistance
RT9715A/B
RT9715C/D
RT9715E/F
RT9715G/H
RT9715A/B
RT9715C/D
RT9715E/F
RT9715G/H
RT9715A/B
RT9715C/D
RT9715E/F
RT9715G/H
Symbol
I
Q
I
SHDN
Test Conditions
Switch On, V
OUT
= Open
Switch Off, V
OUT
= Open
V
IN
= 5V, I
OUT
= 1.5A
V
IN
= 5V, I
OUT
=1.3A
V
IN
= 5V, I
OUT
= 1A
V
IN
= 5V, I
OUT
= 0.6A
V
OUT
= 4V
Min
--
--
--
--
--
--
2
1.5
1.1
0.7
--
--
--
--
Typ
50
0.1
90
90
90
90
2.5
2
1.5
1
1.7
1.4
1
0.7
Max
70
1
110
110
110
110
3.2
2.8
2.1
1.4
--
--
--
--
Unit
uA
R
DS(ON)
mΩ
Current
Limit
I
LIM
A
Short
Current
I
SC_FB
V
OUT
= 0V, Measured Prior to
Thermal Shutdown
A
To be continued
DS9715-03 April 2011
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3
RT9715
Parameter
EN/EN
Threshold
Logic_High Voltage
Logic_Low Voltage
Symbol
V
IH
V
IL
I
EN/EN
I
LEAKAGE
T
ON_RISE
R
FLG
I
FLG_OFF
T
D
R
Discharge
V
UVLO
ΔV
UVLO
T
SD
Test Conditions
V
IN
= 2.7V to 5.5V
V
IN
= 2.7V to 5.5V
V
EN
= 5V
V
EN
= 0V, R
LOAD
= 0Ω
10% to 90% of V
OUT
Rising
I
SINK
= 1mA
V
FLG
= 5V
From fault condition to FLG
assertion
V
EN
= 0V, V
EN
= 5V
V
IN
Rising
V
IN
Decreasing
V
OUT
> 1V
V
OUT
= 0V
V
OUT
= 0V
Min
2
--
--
--
--
--
--
5
--
1.3
--
--
--
--
Typ
--
--
0.01
0.5
200
20
0.01
12
100
1.7
0.1
120
100
20
Max
--
0.8
0.1
1
--
--
1
20
150
--
--
--
--
--
Unit
V
V
uA
uA
us
Ω
uA
ms
Ω
V
V
°C
°C
°C
EN/EN Input Current
Output Leakage Current
Output Turn-On Rise Time
FLG Output Resistance
FLG Off Current
FLG Delay Time
Shutdown Auto-Discharge
Resistance
Under-Voltage Lockout
Under-Voltage Hysteresis
Thermal Shutdown Protection
Thermal Shutdown Hysteresis
Note 1.
Stresses beyond those listed under
“
Absolute Maximum Ratings
”
may cause permanent damage to the device.
These are stress ratings only, and functional operation of the device at these or any other conditions beyond those
indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
Note 2.
θ
JA
is measured in the natural convection at T
A
= 25°C on a low effective single layer thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
Note 3.
Devices are ESD sensitive. Handling precaution is recommended.
Note 4.
The device is not guaranteed to function outside its operating conditions.
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4
DS9715-03 April 2011
RT9715
Typical Operating Characteristics
On Resistance vs. Input Voltage
108
106
On Resistance vs. Temperature
125
120
I
OUT
= 2A
SOP-8
V
IN
= 5V, I
OUT
= 2A
On Resistance (mΩ)
On Resistance (mΩ)
104
102
100
98
96
94
92
90
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
115
110
105
100
95
90
85
80
75
70
-40
-25
-10
5
20
35
50
65
80
SOP-8
SOT-23-5
SOT-23-5
Input Voltage (V)
Temperature
(°C)
Quiescent Current vs. Input Voltage
60
58
Quiescent Current vs. Temperature
60
59
No Load
V
IN
= 5V,No Load
Quiescent Current (uA)
Quiescent Current (uA)
56
54
52
50
48
46
44
42
40
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
58
57
56
55
54
53
52
51
50
-40
-25
-10
5
20
35
50
65
80
95
110
Input Voltage (V)
Temperature
(°C)
Shutdown Current vs. Input Voltage
1.0
0.9
Shutdown Current vs. Temperature
1.0
0.9
No Load
V
IN
= 5V
Shutdown Current (uA)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Shutdown Current (uA)
0.8
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
-40
-25
-10
5
20
35
50
65
80
95
110
Input Voltage (V)
Temperature
(°C)
DS9715-03 April 2011
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5
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