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PDF RT9742 Data sheet ( Hoja de datos )
| Número de pieza | RT9742 | |
| Descripción | 3A/2A/1.5A/1A High-Side Power Switches | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT9742 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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®
RT9742
70mΩ/55mΩ, 3A/2A/1.5A/1A High-Side Power Switches
with Flag
General Description
The RT9742 is a cost-effective, low-voltage, single
N-MOSFET high-side Power Switch IC for USB application.
Low switch-on resistance and low supply current are
realized in this IC.
The RT9742 integrates an over-current protection circuit,
a short fold back circuit, a thermal shutdown circuit and
an under-voltage lockout circuit for overall protection.
Besides, 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
miss-operation from happening due to inrush-current. The
RT9742 is an ideal solution for USB power supply and
can support flexible applications since it is available in
TSOT-23-5, TSOT-23-5 (FC) and SOT-23-3 package.
Features
70mΩ/55mΩ (typ.) N-MOSFET Switch
Operating Range : 2.7V to 6V
Reverse Blocking Current
Under Voltage Lockout
Deglitched Fault Report (FLG)
Thermal Protection with Fold-back
Over Current Protection
Short Circuit Protection
Applications
USB Peripherals
Notebook PCs
Pin Configurations
VIN EN/EN
54
23
VOUT GND FLG
TSOT-23-5 / TSOT-23-5 (FC)
(TOP VIEW)
VOUT
EN
54
23
VOUT GND VIN
TSOT-23-5
(For RT9742M Only)
GND
3
2
VIN VOUT
SOT-23-3
Simplified Application Circuit
Supply Voltage
2.7V to 6V
Chip Enable
VIN FLG
CIN RT9742
EN/EN VOUT
GND
USB Controller
Over-Current
COUT
VBUS
D+
D-
GND
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS9742-00 July 2015
Data
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
Operation
Charge Pump and Drivers
An internal charge pump supplies power to the driver circuit
and provides the necessary voltage to pull the gate of the
MOSFET above the source. The driver controls the gate
voltage of the power switch.
Current Limit
The RT9742 continuously monitors the output current for
over-current protection to protect the system power, the
power switch, and the load from damage during output
short circuit. When an overload or short circuit occurs,
the current-sense circuitry sends a control signal to the
driver. The driver reduces the gate voltage and drives the
power MOSFET into its saturation region, which switches
the output into a constant-current mode and holds the
current constant until the thermal shutdown occurs or the
fault is removed.
RT9742
Under-Voltage Lockout
A voltage-sense circuit monitors the input voltage. When
the input voltage is above 2.4V, UVLO turns on the
MOSFET switch.
Thermal Shutdown
The RT9742 continuously monitors the operating
temperature of the power switch for over-temperature
protection. The RT9742 turns off the power switch to
prevent the device from damage if the junction temperature
rises to approximately 140°C due to over-current or short-
circuit conditions. The pass element turns on again after
the junction temperature cools to 120°C.
FLAG
The RT9742 pulls low the open drain output FLAG after
over current or over temperature condition occurring over
approximately 10ms.
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS9742-00 July 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
Power On from VIN
RT9742
Power Off from VIN
VIN
(2V/Div)
VOUT
(2V/Div)
EN
(5V/Div)
VOUT
(2V/Div)
IIN
(2A/Div)
Time (2ms/Div)
No Load
Power On from EN
Time (200μs/Div)
VIN
(2V/Div)
VOUT
(2V/Div)
FLG
(5V/Div)
VOUT
(2V/Div)
IIN
(2A/Div)
Time (10ms/Div)
No Load
FLG Response
Time (2ms/Div)
VIN = 5V
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS9742-00 July 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet RT9742.PDF ] | |
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