RT9711A/B/C/D
80mΩ, 1.5A/0.6A High-Side Power Switches with Flag
Ω
General Description
The RT9711A/B/C/D are cost-effective, low voltage, single
N-MOSFET high-side power switches, optimized for self-
powered and bus-powered Universal Serial Bus (USB)
applications. The RT9711 series are equipped with a
charge pump circuitry to drive the internal MOSFET switch.
The switch's low R
DS(ON)
, 80mΩ, meets USB voltage drop
requirements. A flag output is available to indicate fault
conditions to the local USB controller.
Additional features include soft-start to limit inrush current
during plug-in, 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, fault current
is limited to typically 2.5A for RT9711A/B in dual ports
and 1A for RT9711C/D in single port in accordance with
the USB power requirements, lower quiescent current as
25μA making this device ideal for portable battery-operated
equipment.
The RT9711 series are available in SOT-23-5, TSOT-23-5,
SOP-8 and MSOP-8 packages fitting different aspect of
broad applications.
Features
Compliant to USB Specifications
Built-In N-MOSFET
Typical R
DS(ON)
: 80mΩ (SOT-23-5 & TSOT-23-5) and
Ω
90mΩ (SOP-8 & MSOP-8)
Ω
Output Can Be Forced Higher Than Input (Off-State)
Low Supply Current :
25μA Typical at Switch On State
μ
1μA Typical at Switch Off State
μ
Guaranteed 1.5A for RT9711A/B and 0.6A for
RT9711C/D Continuous Load Current
Wide Input Voltage Ranges : 2.5V to 5.5V
Open-Drain Fault Flag Output
Hot Plug-In Application (Soft-Start)
1.7V Typical Under-Voltage Lockout (UVLO)
Current Limiting Protection
Thermal Shutdown Protection
Reverse Current Flow Blocking (no body diode)
Smallest SOT-23-5 and TSOT-23-5 Packages
Minimizes Board Space
UL Approved
−
E219878
TUV
IEC60950-1 : 2005
Certified
RoHS Compliant and 100% Lead (Pb)-Free
Ordering Information
RT9711
Package Type
B : SOT-23-5
BG : SOT-23-5 (G-Type)
J5 : TSOT-23-5
S : SOP-8
F : MSOP-8
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Output Current/EN Function
A : 1.5A/Active High
B : 1.5A/Active Low
C : 0.6A/Active High
D : 0.6A/Active Low
Applications
USB Bus/Self Powered Hubs
USB Peripherals
ACPI Power Distribution
PC Card Hot Swap
Notebook, Motherboard PCs
Battery-Powered Equipment
Hot-Plug Power Supplies
Battery-Charger Circuits
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Note :
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.
DS9711A/B/C/D-03 April 2011
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1
RT9711A/B/C/D
Pin Configurations
(TOP VIEW)
VOUT
5
2
VIN
4
3
VIN
5
2
EN/EN
GND
4
3
8
2
3
4
7
6
5
VOUT
VOUT
VOUT
FLG
VIN
VIN
EN/EN
FLG GND EN/EN
VOUT GND NC
SOT-23-5/TSOT-23-5
SOT-23-5 (G-Type)
SOP-8/MSOP-8
Typical Application Circuit
Pull-Up Resistor (10K to 100K)
Supply
Voltage 5V
VIN
C
IN
1µF
RT9711A/C
Chip Enable
RT9711B/D
Chip Enable
Ferrite
Beads
Data
FLG
USB Controller
Over -Current
Functional Pin Description
Pin Name Pin Function
VIN
VOUT
GND
EN/EN
Power Input Voltage
Output Voltage
Ground
Chip Enable. Never let this pin floating.
(Active High for RT9711A/C, Active Low
for RT9711B/D)
FLG
Open-Drain Fault Flag Output
RT9711A/B/C/D
VOUT
C
OUT
10µF
150µF
V
BUS
D+
D-
GND
EN/EN
+
GND
Note:
A low-ESR 150μF 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)
Function Block Diagram
VIN
EN/EN
Bias
UVLO
Current
Limiting
Gate
Control
Output Voltage
Detection
Oscillator
Charge
Pump
VOUT
Thermal
Protection
FLG
Delay
GND
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DS9711A/B/C/D-03 April 2011
RT9711A/B/C/D
Absolute Maximum Ratings
(Note 1)
Supply Voltage --------------------------------------------------------------------------------------------------------- 6.5V
Chip Enable Input Voltage -------------------------------------------------------------------------------------------
−
0.3V to 6.5V
Flag Voltage ------------------------------------------------------------------------------------------------------------ 6.5V
Power Dissipation, P
D
@ T
A
= 25°C
SOT-23-5, TSOT-23-5 ------------------------------------------------------------------------------------------------- 0.4W
SOP-8, MSOP-8 ------------------------------------------------------------------------------------------------------- 0.625W
Package Thermal Resistance (Note 2)
SOT-23-5, TSOT-23-5,
θ
JA
------------------------------------------------------------------------------------------- 250°C/W
SOP-8, MSOP-8,
θ
JA
------------------------------------------------------------------------------------------------- 160°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 -------------------------------------------------------------------------------------------------- 2.5V to 5.5V
Chip Enable Input Voltage ------------------------------------------------------------------------------------------- 0V to 5.5V
Junction Temperature Range ----------------------------------------------------------------------------------------
−
40°C to 125°C
Ambient Temperature Range ----------------------------------------------------------------------------------------
−
40°C to 85°C
Electrical Characteristics
(V
IN
= 5V, C
IN
= C
OUT
= 1μF, T
A
= 25°C, unless otherwise specified)
Parameter
Switch On
Resistance
(RT9711A/B)
Switch On
Resistance
(RT9711C/D)
SOT-23-5, TSOT-23-5
SOP-8, MSOP-8
SOT-23-5, TSOT-23-5
SOP-8, MSOP-8
Symbol
Test Conditions
I
OUT
= 1A, V
IN
= 5V
Min
--
--
--
--
--
--
--
2.0
--
--
--
1.6
0.7
Typ
80
90
80
90
25
0.1
--
--
0.01
0.5
400
2.5
1
Max
100
110
100
110
45
1
0.8
--
--
10
--
3.2
1.4
Units
mΩ
R
DS(ON)
I
OUT
= 0.5A, V
IN
= 5V
I
SW_ON
I
SW_OFF
V
IL
V
IH
I
EN/EN
I
LEA K
switch on, R
LOAD
Open
switch off, R
LOAD
Open
V
IN
= 2.5V to 5.5V
V
IN
= 2.5V to 5.5V
V
EN/EN
= 0V to 5.5V
V
EN
= 0V, V
EN
= 5V, R
LOAD
= 0Ω
mΩ
Supply Current
EN/EN
Threshold
Logic-Low Voltage
Logic-High Voltage
μA
V
V
μA
μA
us
A
A
EN/EN Input Current
Output Leakage Current
Output Turn-On Rise Time
Current Limit
RT9711A/B
RT9711C/D
T
ON_RISE
10% to 90% of V
O UT
rising
I
LIM
Current Ramp (< 0.1A/ms) on
V
OUT
To be continued
DS9711A/B/C/D-03 April 2011
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3
RT9711A/B/C/D
Parameter
Short Circuit
Fold-Back Current
RT9711A/B
RT9711C/D
Symbol
I
SC_FB
R
FLG
Test Conditions
V
OUT
= 0V, measured prior to
thermal shutdown
I
SINK
= 1mA
From fault condition to FLG
assertion
V
E N
= 0V, V
EN
= 5V
V
IN
increasing
V
IN
decreasing
Min
--
--
--
--
5
--
1.3
--
--
--
Typ
1
0.8
20
0.01
12
75
1.7
0.1
130
20
Max
--
--
400
1
20
150
--
--
--
--
Units
A
Ω
μA
ms
Ω
V
V
°C
°C
FLAG Output Resistance
FLAG Off Current
FLAG Delay Time
(Note 5)
I
FLG_OFF
V
FLG
= 5V
t
D
R
DS
V
UVLO
ΔV
UVLO
T
SD
ΔT
SD
Shutdown Pull-Low Resistance
Under-voltage Lockout
Under-voltage Hysteresis
Thermal Shutdown Protection
Thermal Shutdown Hysteresis
Note
1.
Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for
stress ratings. 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 remain possibility to affect device reliability.
Note 2.
θ
JA
is measured in the natural convection at T
A
= 25°C on a low effective thermal conductivity single layer 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.
Note 5.
The FLAG delay time is input voltage dependent, see“ Typical Operating Characteristics” graph for further details.
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4
DS9711A/B/C/D-03 April 2011
RT9711A/B/C/D
Typical Operating Characteristics
Switch On Resistance vs. Temperature
0.25
0.25
Switch On Resistance vs. Temperature
Switch On Resistance (Ω)
Switch On Resistance (Ω)
0.2
0.2
0.15
0.15
0.1
0.1
0.05
0.05
0
SOP-8, V
IN
= 5V, I
LOAD
= 1.5A
C
IN
= 1
u
F/X7R, C
OUT
= 10
μ
F/X7R
-40
-20
0
20
40
60
80
100
120
0
SOT-23-5, V
IN
= 5V, I
LOAD
= 1.5A
C
IN
= 1
μ
F/X7R, C
OUT
= 10
μ
F/X7R
-40
-20
0
20
40
60
80
100
120
Temperature
(°C)
Temperature
(°C)
Switch on Resistance vs. Input Voltage
140
40
35
Supply Current vs. Input Voltage
Switch on Resistance (mΩ)
120
100
80
60
40
20
Supply Current (uA)
30
25
20
15
10
5
0
SOT-23-5, I
LOAD
= 1.5A
C
IN
= C
OUT
= 33
μ
F/Electrolytic
2
2.5
3
3.5
4
4.5
5
5.5
SOT-23-5, R
L
= Open
C
IN
= C
OUT
= 33
μ
F/Electrolytic
2
2.5
3
3.5
4
4.5
5
5.5
Input Voltage (V)
Input Voltage (V)
Supply Current vs. Temperature
30
25
2
Current Limit vs. Input Voltage
Supply Current (uA)
1.8
20
15
10
5
0
Current Limit (A)
V
IN
= 5V, Switch On, R
LOAD
Open
C
IN
= C
OUT
= 33
μ
F/Electrolytic
-40
-20
0
20
40
60
80
100
120
1.6
1.4
1.2
1
RT9711A/B, V
IN
= V
EN
= 5V
C
IN
= 1
μ
F/X7R, C
OUT
= 10
μ
F/X7R
2
2.5
3
3.5
4
4.5
5
5.5
Temperature (°C)
Input Voltage (V)
DS9711A/B/C/D-03 April 2011
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5
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