®
RT9712
90mΩ, 1A/1.5A High-Side Dual Power Switches with Flag
Ω
General Description
The RT9712 power-distribution switches are designed to
fulfill the applications in heavy capacitive loads and short-
circuit situations. The device incorporates two 90mΩ N-
MOSFET power switches to fit power distribution systems
requiring multiple power switches in a single package.
During switching process, an internal charge pump is
designed to provide the gate drive for the purpose of power-
switch rise times and fall times controlling to minimize
the current surges. The charge pump can operate in supply
voltage as low as 2.7V and needs no external
components.
If the output load exceeds the current-limit threshold or a
short-circuit occurs.The RT9712 series pull the overcurrent
(FLGx) logic output low by switching into the constant-
current mode to maintain the output current in a safe level,
A thermal protection circuit turns off the switch to prevent
the device from damage when power dissipation is
increased by continuous heavy overloads and short-circuits
in the switch and finally cause the rise of the junction
temperature. The device automatically recovers when it
has sufficiently cooled down. The RT9712A/B are designed
for the current limit at typically 2A and RT9712C/D are
designed for the current limit at typically 1.5A. Internal
circuitry controls the switch to remain off until valid input
voltage is presented.
Features
Ω
90mΩ N-MOSFET Switch
Operating Voltage Range : 2.7V to 5.5V
Reverse Blocking Current
Under Voltage Lockout
Deglitched Fault Report (FLGx)
Thermal Protection with Foldback
Over Current Protection
Short Circuit Protection
UL Approved
−
E219878
Nemko Approved-NO49352
RoHS Compliant and Halogen Free
Applications
USB Peripherals
Notebook PCs
Ordering Information
RT9712
Package Type
S : SOP-8
F : MSOP-8
Lead Plating System
G : Green (Halogen Free and Pb Free)
Output Current/ENx Function
A : 1.5A/Active High
B : 1.5A/Active Low
C : 1A/Active High
D : 1A/Active Low
Note :
Richtek products are :
Pin Configurations
(TOP VIEW)
GND
VIN
EN1
EN2
2
3
4
8
7
6
5
FLG1
VOUT1
VOUT2
FLG2
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.
RT9712A/C
GND
VIN
EN1
EN2
2
3
4
8
7
6
5
FLG1
VOUT1
VOUT2
FLG2
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
RT9712B/D
SOP-8/MSOP-8
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9712-04
November 2012
www.richtek.com
1
RT9712
Typical Application Circuit
RT9712A/B/C/D
Supply Voltage
2.7V to 5.5V
R1
R2
2
VIN
C
IN
0.1uF
8 FLG1
5 FLG2
3 EN1/EN1
4 EN2/EN2
GND
VOUT1
7
C
OUT1
0.1uF
VOUT2 6
1
C
OUT2
0.1uF
22uF
22uF
Load
Load
RT9712B/D
Chip Enable
RT9712A/C
Chip Enable
Note : R1, R2 : Pull-Up Resistance (10k to 100k)
Functional Pin Description
Pin No.
RT9712A/C RT9712B/D
1
2
--
--
3
4
5
6
7
8
1
2
3
4
--
--
5
6
7
8
Pin Name
GND
VIN
EN1
EN2
EN1
EN2
FLG2
VOUT2
VOUT1
FLG1
Ground.
Input Voltage.
Chip Enable (Active Low) turns on power switch in VOUT1.
Chip Enable (Active Low) turns on power switch in VOUT2.
Chip Enable (Active High) turns on power switch in VOUT1.
Chip Enable (Active High) turns on power switch in VOUT2.
Over current or over temperature status output, open-drain output, active
low, in VOUT2.
Power-Switch Output, in VOUT2.
Power-Switch Output, in VOUT1.
Over current or over temperature status output,, open-drain output, active
low, in VOUT1.
Pin Function
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS9712-04
November 2012
RT9712
Function Block Diagram
EN1/EN1
Bias
Current
Limiting
Oscillator
Charge
Pump
Gate
Control
Output Voltage
Detection
VOUT1
Thermal
Protection
FLG1
Delay
VIN
EN2/EN2
Bias
UVLO
Current
Limiting
Oscillator
Charge
Pump
Gate
Control
Output Voltage
Detection
VOUT2
GND
FLG2
Delay
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9712-04
November 2012
www.richtek.com
3
RT9712
Absolute Maximum Ratings
(Note 1)
Supply Input Voltage, VIN ------------------------------------------------------------------------------------------- 6V
EN Voltage --------------------------------------------------------------------------------------------------------------
−0.3V
to 6V
Power Dissipation, P
D
@ T
A
= 25°C
SOP-8/MSOP-8 ------------------------------------------------------------------------------------------------------- 469mW
Package Thermal Resistance (Note 2)
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 Model) ------------------------------------------------------------------------------------------ 2kV
Recommended Operating Conditions
(Note 4)
Supply Input Voltage, VIN ------------------------------------------------------------------------------------------- 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
= 1μF, C
OUT1
= C
OUT2
= 10μF, T
A
= 25°C, unless otherwise specified)
Parameter
Input Quiescent Current
Input Shutdown Current
Switch On
Resistance
Current Limit
Short Circuit
Fold-back
Current
ENx/ENx
Threshold
RT9712A/B
Symbol
I
Q
I
SHDN
R
DS(ON)
Test Conditions
Switch On, R
LOAD
Open
Switch Off, R
LOAD
Open
I
OUTx
= 1.3A, V
IN
= 5V,
Each Channel
I
OUTx
= 1A, V
IN
= 5V,
Each Channel
V
OUTx
= 4V
V
OUTx
= 0, Measured Prior to
Thermal Shutdown
V
IN
= 2.7V to 5.5V
V
IN
= 2.7V to 5.5V
V
ENx/ENx
= 0V to 5.5V
V
ENx
= 0V, V
ENx
= 5V, R
LOAD
= 0Ω
10% to 90% of V
OUT
Rising
I
SINK
= 1mA
V
FLGx
= 5V
From Fault Condition to FLG
Assertion
Min
--
--
---
--
1.5
1.1
--
--
--
2
--
-
--
--
--
5
Typ
70
0.1
90
90
2
1.5
1.4
1
--
--
0.01
0.5
175
20
0.01
12
Max
90
1
110
110
2.8
2.1
--
--
0.8
--
0.1
1
--
--
1
20
Unit
μA
mΩ
mΩ
A
A
RT9712C/D
RT9712A/B
RT9712C/D
RT9712A/B
RT9712C/D
I
LIM
I
SC_FB
Logic-Low Voltage V
IL
Logic-High Voltage V
IH
I
ENx/ENx
ENx/ENx Input Current
Output Leakage Current
Output Turn-On Rising Time
FLGx Output Resistance
FLGx Off Current
FLGx Delay Time
I
LEAKAGE
T
ON_RISE
R
FLG
I
FLG_OFF
T
D
V
μA
μA
μs
Ω
μA
ms
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS9712-04
November 2012
RT9712
Parameter
Shutdown Auto-discharge
Resistance
Under Voltage Lockout
Under Voltage Hysteresis
Thermal Shutdown Protection
Thermal Shutdown Protection
Thermal Shutdown Hysteresis
Symbol
R
Discharge
V
UVLO
ΔV
UVLO
T
SD
Test Conditions
V
ENx
= 0V, V
ENx
= 5V
V
IN
Increasing
V
IN
Decreasing
V
OUTx
> 1V
V
OUTx
< 1V
Min
--
1.3
--
--
--
--
Typ
100
1.7
0.1
120
100
20
Max
150
--
--
--
--
--
Unit
Ω
V
V
°C
°C
°C
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 low effective thermal conductivity single-layer test board per JEDEC 51-3.
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.
DS9712-04
November 2012
www.richtek.com
5
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