®
RT9724
100mΩ, 2A Slew Rate Controlled Load Switch
Ω
General Description
The RT9724 is a cost-effective, low-voltage, single
N-MOSFET high-side Power Switch IC. Low switch-on
resistance (typ. 100mΩ) and low supply current (typ. 50uA)
are realized in this IC. The RT9724 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 slew rate
controlled function is embedded for turn-on rising time
control. The RT9724 is available in SOT-23-5 and WDFN-
8L 2x2 package.
Features
Ω
100mΩ (typ.) N-MOSFET Switch
Operating Range : 2.7V to 5.5V
Reverse Blocking Current
Under Voltage Lockout
Thermal Protection with Foldback
Over Current Protection
Short Circuit Protection
Slew Rate Limited Turn-On Time 3ms (5V)
RoHS Compliant and Halogen Free
Applications
Ordering Information
RT9724
Package Type
B : SOT-23-5
QW : WDFN-8L 2x2 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
Cellular Phones
Digital still Camera
Hot swap Supplies
Notebook Computers
Personal Communication Devices
Personal Digital Assistants
Pin Configurations
(TOP VIEW)
VIN
5
2
VIN
4
3
Marking Information
RT9724GB
1Y= : Product Code
EN GND VOUT
SOT-23-5
NC
VOUT
EN
GND
VIN
VIN
VIN
VIN
1Y=DNN
DNN : Date Code
1
2
3
4
8
7
6
5
RT9724GQW
GV : Product Code
WDFN-8L 2x2
GVW
W : Date Code
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9724-02 July 2012
GND
9
www.richtek.com
1
RT9724
Typical Application Circuit
2.7V to 5.5V
C
IN
1µF
VIN
VOUT
C
OUT
0.1µF
Load
RT9724
EN
GND
Chip Enable
Functional Pin Description
Pin No.
SOT-23-5
1
2
3
4, 5
--
WDFN-8L 2x2
3
Pin Name
EN
Chip Enable (Active High).
Ground.
The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
Power-Switch Output.
Power Input Voltage.
No Internal Connection.
Pin Function
4,
GND
9 (Exposed Pad)
2
5, 6, 7, 8
1
VOUT
VIN
NC
Function Block Diagram
VIN
EN
Bias
UVLO
Current
Limiting
Gate
Control
Output Voltage
Detection
Thermal
Protection
Auto Discharge
GND
VOUT
Oscillator
Charge
Pump
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS9724-02 July 2012
RT9724
Absolute Maximum Ratings
(Note 1)
Supply Voltage, VIN ------------------------------------------------------------------------------------------------------ 6V
Enable Input Voltage, EN ------------------------------------------------------------------------------------------------
−0.3V
to 6V
Power Dissipation, P
D
@ T
A
= 25°C
SOT-23-5 -------------------------------------------------------------------------------------------------------------------- 0.458W
WDFN-8L 2x2 -------------------------------------------------------------------------------------------------------------- 0.833W
Package Thermal Resistance (Note 2)
SOT-23-5,
θ
JA
-------------------------------------------------------------------------------------------------------------- 218.1°C/W
WDFN-8L 2x2,
θ
JA
-------------------------------------------------------------------------------------------------------- 120°C/W
Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ---------------------------------------------------------------------------------------------- 4kV
Recommended Operating Conditions
(Note 4)
Supply Voltage, VIN ------------------------------------------------------------------------------------------------------ 2.7V to 5.5V
Enable Input Voltage, EN ------------------------------------------------------------------------------------------------ 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
= 1μF, C
OUT
= 0.1μF, T
A
= 25°C, unless otherwise specified)
Parameter
Operation Voltage
Under Voltage Lookout
Under Voltage Lockout
Hysteresis
Quiescent Current
Off Supply Current
Off Switch Current
On-Resistance
Current Limiting
Short Circuit Current
Thermal shutdown Threshold
Hysteresis
EN Threshold
Voltage
Logic-Low
Logic-High
Symbol
V
IN
V
UVLO
ΔV
UVLO
I
Q
I
SHDN
I
LEAKAGE
R
DS(ON)
I
LIM
I
SC_FB
T
SD
Test Conditions
V
IN
Falling
Min
2.7
1.3
--
Typ
--
1.7
50
50
--
--
100
2
0.8
130
100
20
--
--
--
Max
5
2.1
--
70
1
1
120
2.5
1.5
--
--
--
0.8
--
1
Unit
V
V
mV
μA
μA
μA
mΩ
A
A
°C
°C
°C
V
V
μA
EN = High
EN = Low, V
OUT
= Open
EN = Low, V
OUT
= 0
V
IN
= 3.3V, I
OUT
= 1.3 A
V
IN
= 3.3V, V
OUT
= 2.3V
V
OUT
= 0V, Measured Prior to
Thermal Shutdown
V
OUT
> 1V
V
OUT
= 0V
V
IN
= 2.7V to 5.5V
V
IN
= 2.7V to 5.5V
V
EN
= 5.5V
--
--
--
--
1.5
0.4
--
--
--
--
2
--
V
IL
V
IH
I
EN
Enable Input Leakage
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9724-02 July 2012
www.richtek.com
3
RT9724
Parameter
Output Turn-On Delay Time
Output Turn-On Rise Time
Output Turn-Off Delay Time
Output Pull-Down Resistance
During OFF
Symbol
T
D_ON
T
ON
T
D_OFF
Test Conditions
V
IN
= 5V, R
LOAD
= 10Ω
V
IN
= 5V, R
LOAD
= 10Ω
V
IN
= 5V, R
LOAD
= 10Ω
Min
--
1
--
--
Typ
60
3
4
150
Max
100
--
10
--
Unit
μs
ms
μs
Ω
R
DISCHARGE
EN = Low
Note 1.
Stresses beyond those listed
“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 may
affect device reliability.
Note 2.
θ
JA
is measured at T
A
= 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7.
Note 3.
Devices are ESD sensitive. Handling precaution is recommended.
Note 4.
The device is not guaranteed to function outside its operating conditions.
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS9724-02 July 2012
RT9724
Typical Operating Characteristics
On Resistance vs. Input Voltage
115
On Resistance vs. Temperature
150
140
EN = 5V, I
OUT
= 1.5A
V
IN
= V
EN
= 5V, I
OUT
= 1.5A
On Resistance (mΩ)
On Resistance (mΩ)
114
130
120
110
100
90
113
112
111
110
2.7
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
80
-40
-20
0
20
40
60
80
100
Input Voltage (V)
Temperature (°C)
Quiescent Current vs. Input Voltage
30
Quiescent Current vs. Temperature
30
V
EN
= 5V, No Load
V
IN
= V
EN
= 5.5V, No Load
Quiescent Current (µA)
24
Quiescent Current (µA)
2.7
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
27
28
26
21
24
18
22
15
20
-40
-20
0
20
40
60
80
100
Input Voltage (V)
Temperature (°C)
Shutdown Current vs. Input Voltage
0.30
0.25
0.20
0.15
0.10
0.05
0.00
2.7
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Shutdown Current vs. Temperature
1
0.9
V
EN
= 0V,No Load
V
IN
= 5.5V, V
EN
= 0V, No Load
Shutdown Current (µA)1
Shutdown Current (µA)1
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-40
-20
0
20
40
60
80
100
Input Voltage (V)
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
Temperature (°C)
is a registered trademark of Richtek Technology Corporation.
DS9724-02 July 2012
www.richtek.com
5
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