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A4773 Schematic ( PDF Datasheet ) - AiT Semiconductor

Teilenummer A4773
Beschreibung PRECISION LOAD SWITCH
Hersteller AiT Semiconductor
Logo AiT Semiconductor Logo 




Gesamt 14 Seiten
A4773 Datasheet, Funktion
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-






A4773 Datasheet, Funktion
AiT Semiconductor Inc.
www.ait-ic.com
A4773
SWITCH
PRECISION LOAD SWITCH WITH ADJUSTABLE CURRENT LIMIT
5. Full Load to Short-Circuit
6. Short-Circuit to Full load
VIN=5V, RILIM=20K
VIN=5V, RILIM=20K
CH1: Output Voltage; CH2: nFAULT pin Voltage;
CH1: Output Voltage; CH2: nFault pin Voltage;
CH4: Input Current
CH4: Input Current
7. No-load to Short-Circuit
8. Short-Circuit to No-load
VIN=5V, RILIM=20K
VIN=5V,RILIM=20K
CH1: Output Voltage; CH2: nFAULT pin Voltage;
CH1: Output Voltage; CH2: nFAULT pin
CH4: Input Current
Voltage; CH4: Input Current
REV1.1
- DEC 2011 RELEASED, MAR 2013 UPDATED -
-6-

6 Page









A4773 pdf, datenblatt
AiT Semiconductor Inc.
www.ait-ic.com
A4773
SWITCH
PRECISION LOAD SWITCH WITH ADJUSTABLE CURRENT LIMIT
PACKAGE INFORMATION
Dimension in DFN6 (Unit: mm)
Symbol
A
A1
b
c
D
D2
e
Nd
E
E2
L
h
Min Max
0.700
0.800
0.000
0.050
0.250
0.350
0.180
0.250
1.950
2.050
1.000
1.450
0.65BSC
1.30BSC
1.950
2.050
0.500
0.850
0.250
0.400
0.100
0.200
REV1.1
- DEC 2011 RELEASED, MAR 2013 UPDATED -
- 12 -

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