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PDF RT9728A Data sheet ( Hoja de datos )
| Número de pieza | RT9728A | |
| Descripción | 1.3A Power Switch | |
| Fabricantes | Richtek | |
| Logotipo |  |
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®
RT9728A
120mΩ, 1.3A Power Switch with Programmable Current Limit
General Description
The RT9728A 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 RT9728A 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 RT9728A 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.
Ordering Information
RT9728A
Package Type
E : SOT-23-6
QW : WDFN-6L 2x2
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
H : Chip Enable High
L : Chip Enable Low
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.
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 Input−Output 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
Pin Configurations
(TOP VIEW)
VOUT ILIM FAULT
654
23
VIN GND EN/EN
SOT-23-6
VOUT 1
ILIM 2
FAULT 3
6 VIN
5 GND
7 4 EN/EN
WDFN-6L 2x2
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS9728A-06 November 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT9728A
Parameter
Symbol
Test Conditions
Reverse Voltage Comparator
Trip Point (VOUT VIN)
FAULT Output Low Voltage VOL
FAULT Off State Leakage
IFAULT = 1mA
VFAULT = 5.5V
FAULT Deglitch
FAULT assertion or de-assertion due to
over current condition
FAULT assertion or de-assertion due to
reverse voltage condition
Min Typ Max
-- 135 --
-- 180 --
-- 1 --
5 7.5 10
24 6
Unit
mV
mV
A
ms
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. θJA is measured at TA = 25°C on a low effective thermal conductivity single-layer test board per JEDEC 51-3. θJC is
measured at the exposed pad of the package.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS9728A-06 November 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
single-layer thermal test board. The maximum power
dissipation at TA = 25°C can be calculated by the following
formula :
PD(MAX) = (125°C − 25°C) / (250°C/W) = 0.400W for
SOT-23-6 package
PD(MAX) = (125°C − 25°C) / (165°C/W) = 0.606W for
WDFN-6L 2x2 package
The maximum power dissipation depends on the operating
ambient temperature for fixed TJ(MAX) and thermal
resistance, θJA. The derating curves in Figure 2 allow the
designer to see the effect of rising ambient temperature
on the maximum power dissipation.
0.65
0.60
0.55
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
0
Single-Layer PCB
WDFN-6L 2x2
SOT-23-6
25 50 75 100
Ambient Temperature (°C)
125
Figure 2. Derating Curve of Maximum Power Dissipation
RT9728A
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS9728A-06 November 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet RT9728A.PDF ] | |
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