RT9728B
®
DS9728B-00 August 2013 www.richtek.com
11
©
Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Features
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±±
±±
±10% Current Limit Accuracy @ 1.3A
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z Adjustable Current Limit : 75mA to 1.8A (typ.)
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z Meets USB Current Limiting Requirements
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z Operating Voltage Range : 2.5V to 5.5V
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z Reverse Input
−−
−−
−Output Voltage Protection
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z Built-in Soft-Start
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z 120m
ΩΩ
ΩΩ
Ω P-MOSFET
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z 120
μμ
μμ
μA Supply Current
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z RoHS Compliant and Halogen Free
120m
ΩΩ
ΩΩ
Ω, 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
Simplified Application Circuit
Ordering Information
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.
RT9728B
Package Type
E : SOT-23-6
QW : WDFN-6L 2x2
H : Chip Enable High
L : Chip Enable Low
Lead Plating System
G : Green (Halogen Free and Pb Free)
VIN
RT9728B
V
IN
ILIM
R
ILIM
VOUT
FAULT
EN/EN
R
FAULT
C
IN
V
OUT
GND
FAULT Signal
Enable
