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RT9715FGB Datasheet(PDF) 9 Page - Richtek Technology Corporation

Part No. RT9715FGB
Description  Operating Range : 2.7V to 5.5V, Reverse Blocking Current
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Maker  RICHTEK [Richtek Technology Corporation]
Homepage  http://www.richtek.com
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RT9715FGB Datasheet(HTML) 9 Page - Richtek Technology Corporation

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RT9715
9
DS9715-03 April 2011
www.richtek.com
Power Dissipation
The junction temperature of the RT9715 series depend on
several factors such as the load, PCB layout, ambient
temperature and package type. The output pin of the
RT9715 can deliver the current of up to 2A (RT9715A/B),
1.5A(RT9715C/D), 1.1A(RT9715E/F) and 0.7A(RT9715G/
H) respectively over the full operating junction temperature
range. However, the maximum output current must be
derated at higher ambient temperature to ensure the
junction temperature does not exceed 100
°C. With all
possible conditions, the junction temperature must be within
the range specified under operating conditions. Power
dissipation can be calculated based on the output current
and the RDS(ON) of the switch as below.
PD = RDS(ON) x IOUT2
Although the devices are rated for 2A, 1.5A, 1.1A and 0.7A
of output current, but the application may limit the amount
of output current based on the total power dissipation and
the ambient temperature. The final operating junction
temperature for any set of conditions can be estimated by
the following thermal equation :
PD (MAX) = ( TJ (MAX) - TA ) / θJA
Where TJ (MAX) is the maximum junction temperature of
the die (100
°C)andTA is the maximum ambient temperature.
turns the pass element off. The pass element turn on again
after the junction temperature cools to 80
°C. The RT9715
lowers its OTP trip level from 120
°C to 100°C when output
short circuit occurs (VOUT < 1V) as shown in Figure 1.
The junction to ambient thermal resistance (
θJA) for
SOT-23-5/TSOT-23-5, SOP-8/MSOP-8 and WDFM-8L 3x3
packages at recommended minimum footprint are 250
°C/
W, 160
°C/W and 108°C/W respectively (θJA is layout
dependent).
Universal Serial Bus (USB) & Power Distribution
The goal of USB is to enable device from different vendors
to interoperate in an open architecture. USB features
include ease of use for the end user, a wide range of
workloads and applications, robustness, synergy with the
PC industry, and low-cost implementation. Benefits include
self-identifying peripherals, dynamically attachable and
reconfigurable peripherals, multiple connections (support
for concurrent operation of many devices), support for as
many as 127 physical devices, and compatibility with PC
Plug-and-Play architecture.
The Universal Serial Bus connects USB devices with a
USB host: each USB system has one USB host. USB
devices are classified either as hubs, which provide
additional attachment points to the USB, or as functions,
which provide capabilities to the system (for example, a
digital joystick). Hub devices are then classified as either
Bus-Power Hubs or Self-Powered Hubs.
A Bus-Powered Hub draws all of the power to any internal
functions and downstream ports from the USB connector
power pins. The hub may draw up to 500mA from the
upstream device. External ports in a Bus-Powered Hub
can supply up to 100mA per port, with a maximum of four
external ports.
Self-Powered Hub power for the internal functions and
downstream ports does not come from the USB, although
the USB interface may draw up to 100mA from its upstream
connect, to allow the interface to function when the
remainder of the hub is powered down. The hub must be
able to supply up to 500mA on all of its external
downstream ports. Please refer to Universal Serial
Specification Revision 2.0 for more details on designing
compliant USB hub and host systems.
Over-Current protection devices such as fuses and PTC
resistors (also called polyfuse or polyswitch) have slow
trip times, high on-resistance, and lack the necessary
circuitry for USB-required fault reporting.
Figure 1. Short Circuit Thermal Folded Back Protection
when Output Short Circuit Occurs (Patent)
VOUT Short to GND
1V
VOUT
IOUT
Thermal
Shutdown
OTP Trip Point
120 C
°
100 C
°
100 C
°
80 C
°
IC Temperature


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