AX1184 Linear Regulator Datasheet

AX1184 Datasheet, PDF, Equivalent


Part Number

AX1184

Description

4A Ultra Low Dropout Positive Linear Regulator

Manufacture

AXElite

Total Page 10 Pages
Datasheet
Download AX1184 Datasheet


AX1184
AX1184
4A Ultra Low Dropout Positive Linear Regulator
„ Feature
0.7V maximum dropout voltage at 4A load current
Built-in Thermal shutdown
Output current limiting
Adjustable output voltage: 1.250V
Fast transient response
Good noise rejection
Packages: SOP-8L, TO220-5L and TO263-5L
„ General Description
AX1184 is a 4A regulator with extremely low dropout voltage. This product is specifically designed to provide
well regulated supply for applications requiring 2.8V or lower voltages from 3.3V ATX power supplies where
high efficiency of the switch can be achieved without the cost and complexity associated with switching
regulator. One such application is the new graphic chipsets that requires anywhere from 2.4V to 2.7V supply.
„ Ordering Information
AX1184 X X
Package
S:SOP-8L
M5:TO263-5L
T5:TO220-5L
Packing
Blank : Tube
A : Taping
„ Typical Application
VIN+2.5V VIN+5V
C1
100uF
C2
100uF
AX1184-ADJ
1 Vsense
2 ADJ/GND
4 Vctrl
VOUT
5 VIN
3
VOUT = VREF x (1+ R2 )
VREF = 1.250V
R1
Vout=1.8V
R1
100 C3
100uF
R2
220
Axelite Confidential Materials, do not copy or distribute without written consent
1/11
1/10
Rev.1.0 Jan.16, 2008

AX1184
4A Ultra Low Dropout Positive Linear Regulator AX1184
„ Block Diagram
Vin
Vctrl
+
CURRENT +
LIMIT
-
THERMAL
SHUTDOWN
1.25V +
+
Vout
Vsense
Adj/
GND
„ Pin Configuration
TOP VIEW
TOP VIEW
TOP VIEW
5 Vin
Vsense 1
4 Vctrl
Adj(GND) 2
3 Vout
2 Adj(GND) Vctrl 3
1 Vsense
Vin 4
8 Vout
7 Vout
6 Vout
5 Vout
Tab is Vout
5
4
3
2
1
(AX1184M5)
( AX1184S )
(AX1184T5)
Vin
Vctrl
Vout
Adj(GND)
Vsense
„ Pin Descriptions
Name
Adj
(GND)
Vsense
Vin
Vctrl
Vout
I/O Description
A resistor divider from this pin to the Vout pin and ground sets the output voltage.
(GND only for fixed mode)
I
This pin is the positive side of the reference that allows remote load sensing to
achieve excellent load regulation.
The input of the regulator. Typically a large storage capacitor is connected from this
I
pin to ground to insure that the input voltage does not sag below the minimum
dropout voltage during the load transient response. This pin must always be higher
than Vout in order for the device to regulate.
This pin is the supply pin for the internal control circuit as well as the base drive for
I
the pass transistor. This pin must always by higher than the Vout pin in order the
device to regulate. A minimum of 100uF capacitor must be connected from this pin to
ground to insure stability.
O
The output of the regulator. A minimum of 100uF capacitor must be connected from
this pin to ground to insure stability.
Axelite Confidential Materials, do not copy or distribute without written consent
2/10
Rev.1.0 Jan.16, 2008


Features AX1184 4A Ultra Low Dropout Positive Lin ear Regulator „ Feature • • • • • • 0.7V maximum dropout vol tage at 4A load current Built-in Therma l shutdown Output current limiting Adju stable output voltage: 1.250V Fast tran sient response Good noise rejection Pac kages: SOP-8L, TO220-5L and TO263-5L General Description AX1184 is a 4A re gulator with extremely low dropout volt age. This product is specifically desig ned to provide well regulated supply fo r applications requiring 2.8V or lower voltages from 3.3V ATX power supplies w here high efficiency of the switch can be achieved without the cost and comple xity associated with switching regulato r. One such application is the new grap hic chipsets that requires anywhere fro m 2.4V to 2.7V supply. „ Ordering Inf ormation AX1184 X X Package S:SOP-8L M5 :TO263-5L T5:TO220-5L VÛm w`R •yÑb € ww w.g ofot ec h.co m Packing Blan k : Tube A : Taping „ Typical Applica tion VIN+2.5V VIN+5V 1 2 4 5 C1 100uF C2 100uF AX1184-ADJ Vsense ADJ/GND Vctrl VIN VOUT.
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