Power Switch. RT9728C Datasheet

RT9728C Switch. Datasheet pdf. Equivalent

RT9728C Datasheet
Recommendation RT9728C Datasheet
Part RT9728C
Description 1.3A Power Switch
Feature RT9728C; ® RT9728C 120mΩ, 1.3A Power Switch with Programmable Current Limit General Description The RT9728C.
Manufacture Richtek
Datasheet
Download RT9728C Datasheet




Richtek RT9728C
®
RT9728C
120mΩ, 1.3A Power Switch with Programmable Current Limit
General Description
The RT9728C is a cost effective, low voltage, single
P-MOSFET high-side power switch IC for USB application
with a programmable current limit feature. Low switch-on
resistance (typ.120mΩ) and low supply current (typ.
120μA) are realized in this IC.The RT9728C can offer a
programmable current limit threshold between 75mA and
1.3A (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 from happening due to high inrush current.
The RT9728C is an ideal solution for USB power supply
and can support flexible applications since it is functional
for various current limit requirements. It is available in
SOT-23-6 and WDFN-6L 2x2 packages.
Features
±10% Current Limit Accuracy @ 1.3A
Adjustable Current Limit : 75mA to 1.3A (typ.)
Meets USB Current Limiting Requirements
Operating Voltage Range : 2.5V to 5.5V
Reverse InputOutput Voltage Protection
Built-in Soft-Start
120mΩ High-Side MOSFET
120μA Supply Current
RoHS Compliant and Halogen Free
Applications
USB Bus/Self Powered Hubs
USB Peripheral Ports
ACPI Power Distribution
Battery Power Equipment
3G/3.5G Data Card, Set-Top Boxes
Ordering Information
RT9728C
Package Type
E : SOT-23-6
QW : WDFN-6L 2x2
Lead Plating System
G : Green (Halogen Free and Pb Free)
H : Chip Enable High
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.
Pin Configurations
(TOP VIEW)
VOUT ILIM FAULT
654
23
VIN GND EN
SOT-23-6
VOUT 1
ILIM 2
FAULT 3
6 VIN
5 GND
7 4 EN
WDFN-6L 2x2
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS9728C-00 October 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1



Richtek RT9728C
RT9728C
Marking Information
RT9728CHGE
42=DNN
42= : Product Code
DNN : Date Code
RT9728CHGQW
3W : Product Code
3WW
W : Date Code
Typical Application Circuit
VIN
RFAULT
100k
FAULT Signal
Chip Enable
1C0INµF
VIN VOUT
RT9728C
FAULT
EN
ILIM
GND
RILIM
VOUT
150µF
Functional Pin Description
Pin No.
SOT-23-6 WDFN-6L 2x2
16
2
5,
7 (Exposed Pad)
34
43
52
61
Pin Name
VIN
GND
EN
FAULT
ILIM
VOUT
Pin Function
Input Voltage.
Ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
Chip Enable.
Active-Low Open-Drain Output. Asserted during over current, over
temperature, or reverse-voltage conditions.
Current Limit Set Pin. External resistor used to set current limit
threshold. Recommend 19.1k  RILIM 232k.
Power Switch Output.
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS9728C-00 October 2015



Richtek RT9728C
Function Block Diagram
RT9728C
Reverse Voltage
- Comparator
Switch
+
well
VIN
Current
Sense
VOUT
4ms
Deglitch
60
EN
Drive
Current
Limit
UVLO
Thermal
Sense
7.5ms
Deglitch
FAULT
GND
ILIM
Operation
The RT9728C are current-limited, power-distribution
switches using P-channel MOSFETs for applications
where short circuits or heavy capacitive loads will be
encountered. These devices allow the user to program
the current-limit threshold between 75mA and 1.3A (typ)
via an external resistor. Additional device shutdown features
include over temperature protection and reverse-voltage
protection.
The driver controls the gate voltage of the power switch.
The driver incorporates circuitry that controls the rise and
fall times of the output voltage to limit large current and
voltage surges and provides built-in soft-start functionality.
The RT9728C enters the constant-current mode when the
load exceeds the current-limit threshold.
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS9728C-00 October 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)