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PDF A4773 Data sheet ( Hoja de datos )
| Número de pieza | A4773 | |
| Descripción | PRECISION LOAD SWITCH | |
| Fabricantes | AiT Semiconductor | |
| Logotipo |  |
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AiT Semiconductor Inc.
www.ait-ic.com
A4773
SWITCH
PRECISION LOAD SWITCH WITH ADJUSTABLE CURRENT LIMIT
DESCRIPTION
FEATURES
The A4773 is a load switch which provides full
protection to systems and loads which may
encounter large current conditions. A4773 offers a
95mΩ current-limited switch which can operate over
an input voltage range of 2.5 ~ 5.5V. The current limit
can be externally programmed by a precision
resistor, ranges from 75mA ~ 1.7A.
Switch control is by a logic input (EN) capable of
interfacing directly with low voltage control signals.
Current is prevented from flowing when the switch is
off and the output voltage is higher than the input
voltage. A4773 also features thermal shutdown
protection which shuts off the switch to prevent
damage to the part when a continuous over-current
condition causes excessive heating. When the switch
current reaches the current limit, the parts operate in
a constant-current mode to prohibit excessive
currents from causing damage. The A4773 will not
turn off after a current limit fault, but will rather remain
in the constant current mode indefinitely. The
nFAULT output asserts low during over-current and
reverse-voltage conditions.
Up to 1.5A Max Load current
Accurate Current-limit threshold: +/-5%
Programmable Current-limit : 75mA ~ 1.7A
Fast Over-Current Response
Fault Flag Output: nFAULT Pin
Reversed Current blocking
Thermal Shutdown, UVLO protection
Available in DFN6(2x2) and SOT-26 Packages
APPLICATION
USB ports/Hubs
Hot Swaps
Cell phones
Tablet PC
Set Top Box
PC motherboard
Handheld Devices
The A4773 is available in DFN6(2x2) and SOT-26
Packages.
ORDER INFORMATION
TYPICAL APPLICATION
Package Type
Part Number
DFN6
J6
A4773J6R
A4773J6VR
SOT-26
E6
A4773E6R
A4773E6VR
Note
R: Tape & Reel
V: Halogen free Package
AiT provides all RoHS products
Suffix “ V “ means Halogen free Package
REV1.1
- DEC 2011 RELEASED, MAR 2013 UPDATED -
-1-
1 page  
AiT Semiconductor Inc.
www.ait-ic.com
A4773
SWITCH
PRECISION LOAD SWITCH WITH ADJUSTABLE CURRENT LIMIT
TYPICAL PERFORMANCE CHARACTERISTICS
1. Turn on Delay and Rise time
VIN=5V, RILIM=20K, ROUT=5Ω
CH1: Output Voltage; CH2: Enabled pin
Voltage; CH4: Input Current
2. Turn off Delay and Fall Time
VIN=5V, RILIM=20K, ROUT=5Ω
CH1: Output Voltage; CH2: Enabled pin
Voltage; CH4: Input Current
3. Device Enabled into short-Circuit
4. Device Enabled into short-Circuit
VIN=5V, RILIM=20K, ROUT=0Ω
VIN=5V, RILIM=20K, ROUT=0Ω
CH2: Enabled pin Voltage; CH4: Input Current
CH2: Enabled pin Voltage; CH4: Input Current
REV1.1
- DEC 2011 RELEASED, MAR 2013 UPDATED -
-5-
5 Page 
AiT Semiconductor Inc.
www.ait-ic.com
A4773
SWITCH
PRECISION LOAD SWITCH WITH ADJUSTABLE CURRENT LIMIT
Function Description
The A4773 is a load switch which provides full protection to systems and loads which may encounter large
current conditions. A4773 offers a 95mΩ current-limited switch which can operate over an input voltage range
of 2.5 ~ 5.5V. The current limit can be externally programmed by a precision resistor, ranges from 75mA ~
1.7A. A4773 also features reverse voltage blocking, UVLO, and thermal shutdown to protect IC from
overheating. An nFAULT flag output provides a pull-down signal to indicate fault conditions.
Current Limiting
The current limit ensures that the current through the switch doesn't exceed a maximum value while not
limiting at less than a minimum value. The current at which the parts will limit is adjustable through the
selection of an external resistor connected to ILIM. Information for selecting the resistor is found in the
Application Info section. A4773 thermal cycles if an overload condition is present long enough to activate
thermal limiting in any of the above cases. The device turns off when the junction temperature exceeds
135°C (typ) while in current limit. The device remains off until the junction temperature cools 10°C (typ) and
then restarts
Reverse-Voltage Blocking
The reverse-voltage protection feature turns off the Power MOSFET whenever the output voltage exceeds
the input voltage by 150mV (typ) for 4-ms (typ). This prevents damage to devices on the input side of the
A4773 by preventing significant current from sinking into the input capacitance. The A4773 allow the power
MOSFET to turn on once the output voltage goes below the input voltage for the same 4-ms deglitch time.
The reverse-voltage condition also asserts the nFAULT output (active-low) after 4-ms. During “OFF” condition,
the reverse-voltage blocking function is still in effect, preventing any current floating from OUT to IN even
when the device is not in use.
nFAULT FLAG
The FAULT open-drain output is asserted (active low) during an overcurrent, over temperature or
reverse-voltage condition. The A4773 asserts the FAULT signal until the fault condition is removed and the
device resumes normal operation. The nFAULT signal is de-asserted once device power is cycled or the
enable is toggled and the device resumes normal operation. The A4773 and A4773is designed to eliminate
false nFAULT reporting by using an internal delay "deglitch" circuit for overcurrent (9-ms typ) and
reverse-voltage (4.5-ms typ) conditions without the need for external circuitry. This ensures that nFAULT is
not accidentally asserted due to normal operation such as starting into a heavy capacitive load. The
deglitching circuitry delays entering and leaving fault conditions. Over temperature conditions are not
deglitched and assert the nFAULT signal immediately.
REV1.1
- DEC 2011 RELEASED, MAR 2013 UPDATED -
- 11 -
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet A4773.PDF ] | |
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