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PDF RT9703 Data sheet ( Hoja de datos )
| Número de pieza | RT9703 | |
| Descripción | Smart Universal Power Switch | |
| Fabricantes | RichTek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT9703 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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Preliminary
RT9703
80mΩ, 3A Smart Universal Power Switch with Flag
General Description
The RT9703 is a low voltage, high performance single
N-Channel MOSFET power switch, designed for power
rail on/off control with low RDS(ON) ≈dd80mΩ and full
protection functions. The RT9703 equipped with a charge
pump circuitry to drive the internal MOSFET switch and a
flag output is available to indicate fault conditions against
large di/dt which may cause the supply to fall out of
regulation. In order to fit different application, an IP pin is
offered for current limit point setting, a resistor from IP to
ground sets the current limit for the switch.
Additional features include soft-start to limit inrush current
during plug-in, thermal shutdown to prevent catastrophic
switch failure from high-current loads, under-voltage
lockout (UVLO) to ensure that the device remains off
unless there is a valid input voltage present, a precision
resistor-programmable output current limit up to 3.5A.
Besides, the lower quiescent current as 30µA making this
device ideal for portable battery-operated equipment.
The RT9703 is available in SOP-8 package requiring
minimum board space and smallest components.
Ordering Information
RT9703
Package Type
S : SOP-8
Operating Temperature Range
C : Commercial Standard
Features
Adjustable Current Limiting Up To 3.5A
Built-In (Typically 80mΩ) N-Channel MOSFET
Reverse Current Flow Blocking (no body diode) i.e.
Output Can Be Forced Higher Than Input (Off-State)
Low Supply Current:
30µA Typical at Switch On State
Less Than 1µA Typical at Switch Off State
Guaranteed 3A Continuous Load Current
Wide Input Voltage Ranges: 2V to 5.5V
Open-Drain Fault Flag Output
Hot Plug-In Application (Soft-Start)
1.7V Typical Under-Voltage Lockout (UVLO)
Thermal Shutdown Protection
Smallest SOP-8 Package Minimizes Board Space
Applications
LCD Monitor, LCD-TV
USB Power Module for ADSL
Information Appliance and Set-Top Box
Battery-Powered Equipment
Hot-Plug Power Supplies
ACPI Power Distribution
PCI Bus Power Switching
Motherboard & Notebook PCs
PC Card Hot Swap Application
Pin Configurations
(TOP VIEW)
FLG
VOUT
VOUT
GND
8
27
36
45
SOP-8
IP
VIN
VIN
CE
DS9703-00 September 2003
1
1 page  
Preliminary
RT9703
Parameter
Thermal Shutdown Protection
Thermal Shutdown Hysteresis
Symbol
TSD
∆TSD
Test Conditions
Min Typ Max Units
-- 130 --
-- 10 --
°C
°C
Note 1. Stresses beyond those listed under “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 for extended periods may affect device reliability.
Note 2. Devices are ESD sensitive. Handling precaution recommended. The human body model is a 100pF capacitor
discharged through a 1.5kΩ resistor into input and output pins.
Note 3. The device is not guaranteed to function outside its operating conditions.
Note 4. The FLAG delay time is input voltage dependent, see “Typical Operating Characteristics” graph for further details.
Note 5. Current limit is determined by: ILIMIT = 180k/RSET, where RSET is in ohms.
Note 6. It is important to note that the maximum current limit value shall be set properly in accordance with its supply voltage
otherwise which it may result in the failure occurrence. See “Maximum Current Limit vs. Supply Voltage” graph
shown on the applications information section for further details.
Note 7. For input voltage lower than 5V, the threshold level will subject to ±0.6V deviation throughout the operating junction
temperature range. Refer to the “Typical Operating Characteristics” graph for further details.
Note 8. RDS(ON) is measured at constant junction temperature by using a 1ms current pulse.
5
5 Page 
Preliminary
RT9703
Applications Information
The RT9703 is a high-side, N-Channel, power switch
available with active-high enable input. Low RDS(ON)d≈d
80mΩ and full protection functions make it optimized to
replace complex discrete on/off control circuitry.
Input and Output
VIN (input) is the power source connection to the internal
circuitry and the drain of the MOSFET. VOUT (output) is
the source of the MOSFET. In a typical application, current
flows through the switch from VIN to VOUT toward the load.
If VOUT is greater than VIN, current will flow from VOUT to
VIN since the MOSFET is bidirectional when on.
Unlike a normal MOSFET, there is no a parasitic body
diode between drain and source of the MOSFET, the
RT9703 prevents reverse current flow if VOUT being
externally forced to a higher voltage than VIN when the
output disabled (VCE < 0.8V).
D SD S
G
Normal MOSFE T
G
RT9704
Chip Enable Input
The switch will be disabled when the CE pin is in a logic
low condition. During this condition, the internal circuitry
and MOSFET are turned off, reducing the supply current
to 0.1µA typically. The maximum guaranteed voltage for
a logic low at the CE pin is 0.8V. A minimum guaranteed
voltage of 2V at the CE pin will turn the RT9703 back on.
Floating the input may cause unpredictable operation. CE
should not be allowed to go negative with respect to GND.
The CE pin may be directly tied to VIN to keep the part on.
Soft-Start for Hot Plug-In Applications
In order to eliminate the upstream voltage droop caused
by the large inrush current during hot-plug events, the
“soft-start” feature effectively isolates the power source
from extremely large capacitive loads.
Fault Flag
The RT9703 provides a FLG signal pin which is an
N-Channel open drain MOSFET output. This open drain
output goes low when VOUT < VIN -1V, current limit or the
die temperature exceeds 130°C approximately. The FLG
output is capable of sinking a 10mA load to typically
150mV above ground. The FLG pin requires a pull-up
resistor, this resistor should be large in value to reduce
energy drain. A 100kΩ pull-up resistor works well for most
applications. In the case of an over-current condition, FLG
will be asserted only after the flag response delay time,
tD, has elapsed. This ensures that FLG is asserted only
upon valid over-current conditions and that erroneous
error reporting is eliminated.
For example, false over-current conditions may occur
during hot-plug events when a highly large capacitive load
is connected and causes a high transient inrush current
that exceeds the current limit threshold. The FLG
response delay time tD is typically 4.6ms.
Under-Voltage Lockout
Under-Voltage lockout (UVLO) prevents the MOSFET
switch from turning on until input voltage exceeds
approximately 1.7V. If input voltage drops below
approximately 1.3V, UVLO turns off the MOSFET switch,
FLG will be asserted accordingly. Under- Voltage detection
functions only when the chip enable input is enabled.
Current Limiting and Short-Circuit Protection
The current limit circuitry prevents damage to the
MOSFET switch and external load. It is user adjust- able
with an external set resistor, RSET, ILIMIT = 180k/RSET in
the range of 500mA to 3.5A. The accuracy of current limit
set point may vary with operating temperature and supply
voltage. See “Typical Operating Characteristics” graph
for further details.
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet RT9703.PDF ] | |
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