Power Switch. RT9728B Datasheet

RT9728B Switch. Datasheet pdf. Equivalent

RT9728B Datasheet
Recommendation RT9728B Datasheet
Part RT9728B
Description 1.8A Power Switch
Feature RT9728B; ® RT9728B 120mΩ, 1.8A Power Switch with Adjustable Current Limit General Description The RT9728B i.
Manufacture Richtek
Datasheet
Download RT9728B Datasheet




Richtek RT9728B
®
RT9728B
120mΩ, 1.8A Power Switch with Adjustable Current Limit
General Description
The RT9728B is a cost effective, low voltage, single
P-MOSFET power switch IC for USB application with a
adjustable current limit feature. Low switch-on resistance
(typ. 120mΩ) and low supply current (typ. 120μA) are
realized in this IC. The RT9728B can offer a adjustable
current limit threshold between 75mA and 1.8A (typ.) via
an external resistor. The ±10% current limit accuracy can
be realized for all current limit settings. In addition, 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 mis-operation due to
high inrush current. The RT9728B is an ideal solution for
USB power supplies and can support flexible applications
since it is suitable for various current limit requirements.
It is available in the SOT-23-6 and WDFN-6L 2x2 packages.
Applications
z USB Bus/Self Powered Hubs
z USB Peripheral Ports
z ACPI Power Distribution
z Battery Power Equipment
z 3G/3.5G Data Card, Set-Top Boxes
Features
z ±10% Current Limit Accuracy @ 1.3A
z Adjustable Current Limit : 75mA to 1.8A (typ.)
z Meets USB Current Limiting Requirements
z Operating Voltage Range : 2.5V to 5.5V
z Reverse InputOutput Voltage Protection
z Built-in Soft-Start
z 120mΩ P-MOSFET
z 120μA Supply Current
z RoHS Compliant and Halogen Free
Ordering Information
RT9728B
Package Type
E : SOT-23-6
QW : WDFN-6L 2x2
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
H : Chip Enable High
L : Chip Enable Low
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.
Simplified Application Circuit
VIN
RFAULT
FAULT Signal
Enable
VIN VOUT
CIN RT9728B
FAULT
ILIM
RILIM
EN/EN GND
VOUT
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS9728B-00 August 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11



Richtek RT9728B
RT9728B
Marking Information
RT9728BHGE
0K=DNN
0K= : Product Code
DNN : Date Code
RT9728BHGQW
1RW
1R : Product Code
W : Date Code
RT9728BLGE
0J=DNN
0J= : Product Code
DNN : Date Code
RT9728BLGQW
1QW
1Q : Product Code
W : Date Code
Pin Configurations
VOUT ILIM FAULT
654
23
VIN GND EN/EN
SOT-23-6
(TOP VIEW)
VOUT 1
ILIM 2
FAULT 3
6 VIN
5 GND
7 4 EN/EN
WDFN-6L 2x2
Functional Pin Description
Pin No.
SOT-23-6 WDFN-6L 2x2
Pin Name
1 6 VIN
2
5,
7 (Exposed Pad)
GND
3 4 EN/EN
4 3 FAULT
5 2 ILIM
6 1 VOUT
Pin Function
Power Input.
Ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
Enable Control Input.
Active-Low Open-Drain Output. Asserted during over-current,
over-temperature, or reverse-voltage conditions.
Current Limit Setting. Connect an external resistor to set current
limit threshold. 15kΩ ≤ RILIM 232kΩ is recommended.
Power Switch Output.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS9728B-00 August 2013



Richtek RT9728B
Function Block Diagram
RT9728B
VIN
EN/EN
Switch
well
Drive
Reverse Voltage
+ Comparator
-
Current
Sense
4ms
Deglitch
Current
Limit
UVLO
Thermal
Sense
7.5ms
Deglitch
VOUT
FAULT
GND
ILIM
Operation
The RT9728B is a current-limited power switch using
P-MOSFET for applications where short-circuit or heavy
capacitive loads will be encountered. These devices allow
users to adjust the current limit threshold between 75mA
and 1.8A (typ.) via an external resistor. Additional device
shutdown features include over-temperature protection and
reverse-voltage protection.
The RT9728B provides built-in soft-start function. The driver
controls the gate voltage of the power switch. The driver
incorporates circuitry that controls the rising time and
falling time of the output voltage to limit large inrush current
and voltage surges. The RT9728B enters constant-current
mode when the load exceeds the current limit threshold.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS9728B-00 August 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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