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AX1212A 1.2V Output 1A LOW Dropout Linear Regulator
GENERAL DESCRIPTION AX1212A is a low dropout positive 1.2V output regulator with minimum of 1A output current capability. The product is specifically designed to provide well-regulated supply for low voltage IC applications. AX1212A is also well suited for other applications such as VGA cards. AX1212A is guaranteed to have lower than 1.5V dropout at full load current making it ideal to provide well-regulated outputs of 1.2V with 2.6V to 12V input supply. FEATURES Fixed 1.2V + 2% output voltage 1.5V maximum dropout at full load current Low-ESR Ceramic Capacitor (MLCC) Required for Stability Fast transient response Output current limiting Built-in thermal shutdown Good noise rejection Pb-Free Packages: SOT223, TO252
BLOCK DIAGRAM
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Vin
3 2
Vout
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+ + CURRENT LIMIT 1.2V
+
+
Thermal Shutdown
-
1
GND
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Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.6 Sep.16, 2010
AX1212A
PIN ASSIGNMENT The packages of AX1212A are SOT223-3L and TO252-3L; the pin assignment is given by:
SOT223 ( Top View ) 3 2 1 Tab is Vout
TO252 ( Top View ) 3 2 1 Tab is Vout VIN
Name
VIN VOUT GND
GND
VOUT
VIN
VOUT GND
Description A resistor divider from this pin to the VOUT pin and ground sets the output voltage. (Ground only for Fixed-Mode) The output of the regulator. A minimum of 4.7uF MLCC capacitor must be connected from this pin to ground to insure stability. The input pin of regulator. Typically a 4.7uF MLCC capacitor is connected from this 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 1.5V higher than VOUT in order for the device to regulate properly.
ORDER/MARKING INFORMATION Order Information
Logo
2 AX 1 2 1 A
Ñb€ AX1212A X X y • `R w m Û Dropout Package m V Low o c Regulator . : SOT223-3L ch E e t D : TO252-3L o of g . Top Marking (SOT223-3L) w ww
Y W WX Part number Functional code ID code: internal WW: 01~52 Year: A=2010 1=2011
Packing
Blank : Tube A : Taping
Top Marking (TO252-3L)
2 AX 1 2 1 A Y Y W WX Part number Functional code ID code: internal WW: 01~52 Year: 10=2010 11=2011
Logo
ABSOLUTE MAXIMUM RATINGS (TA = 25°C) Characteristics DC Supply Voltage Operating Junction Temperature Range Maximum junction Temperature Power Dissipation SOT-223 (multi-layer PCB cupper area 10mm*10mm) TO-252 TA=25oC, TJ=125°C Storage Temperature
Symbol VIN TOP TMJ PD TST
Rating -0.3 to 12 -40 to +125 150 1330 1810 -65 to +150
Unit V °C °C mW °C
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Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.6 Sep.16, 2010
AX1212A
ELECTRICAL CHARACTERISTICS (Under Operating Conditions) Characteristics Operation Input Voltage Output Voltage Line Regulation Load Regulation Dropout Voltage (VIN-VOUT) Current Limit Minimum Load Current Ripple Rejection Temperature Stability
JA Thermal
Conditions
Min 2.6
Typ Max Units 12 V V mV mV mV V A mA dB % °C/W
IOUT=10mA, 2.6V≦VIN≦12V, TJ = 25°C IOUT=10mA, 2.6V≦VIN≦7V, TJ=25°C (Note 1,2) IOUT=10mA, 2.6V≦VIN≦12V, TJ=25°C (Note 1,2) VIN=2.7V, 10mA< IOUT <1A, TJ=25°C (Note 1,2) IOUT=1A , VOUT=1%VOUT (VIN-VOUT) = 3V 0°C≦Tj≦125°C F=120Hz,COUT=4.7uF , IOUT=1A,VIN=5V IOUT =10mA SOT-223 VÛmw`R•yÑb€ TO-252 SOT-223 TO-252
1.175 1.20 1.225 1. 1 1.2 1.8 1.3 5 60 0.5 75 55 15 10 3.6 6 12 1.5 10 70 -
Resistance Junction-to-Ambient (Note 4) JC Thermal Resistance Junction-to-Case
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-
-
°C/W
Note1: See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are measured at a constant junction temperature by low duty cycle pulse testing. Load regulation is measured at the output lead = 1/18” from the package. Note2: Line and load regulation are guaranteed up to the maximum power dissipation of 15W. Power dissipation is determined by the difference between input and output differential and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range. Note3: Quiescent current is defined as the minimum output current required in maintaining regulation. At 12V input/output differential the device is guaranteed to regulate if the output current is greater than 10mA. Note4: Tap is connected to the multi-layer PCB cupper area 10mm*10mm.
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Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.6 Sep.16, 2010
AX1212A
APPLICATION CIRCUIT
VIN+3.3V AX1212A VIN VOUT GND
Vout=1.2V 3 2 1 C2 4.7uF
C1 4.7uF
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Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.6 Sep.16, 2010
AX1212A
TYPICAL CHARACTERISTICS
2. 0 1. 8 0.20
Output Voltage Deviation (%)
1. 6
0 I load=800mA
Dropout Voltage (V)
1. 4 1. 2 1. 0 0. 8 0. 6 0. 4 0. 2 0 0 250 500 750 1000 Tj = 125 oC Tj = 25 oC
-0.20
-0.40
-0.80
-1
-.