AQ112
Ultra-Low Dropout
1A Voltage Regulator
Product Specification
Revision 1.6
September 13, 2006
General Description
The AQ112 is an ultra-low dropout three terminal
voltage regulator, offered in popular fixed options
or an adjustable version that can set a precise
voltage from 1.22V to 12V with two external
resistors.
It drops into the footprint of the popular LM1117
SOT-223 and provides a true 4
th
pin separated
from the output tab which allows a separate bias
connection from the pass transistor in order to
achieve
enable
and
ultra low dropout
from V
IN
to V
OUT
.
The
enable
pin provides a remote turn-off for low
power consumption. It draws virtually zero current
in shutdown mode and implements Sequential,
Ratiometric,
or
Simultaneous
sequencing
schemes.
To assure accuracy within 1%, the heart of the
AQ112 is a self-correcting AcuRef™ bandgap
reference.
On-chip current limit and thermal shutdown with
hysteresis protects against any combination of
overload and ambient temperature that might
cause the junction temperature to exceed safe
limits.
Applications
•
Graphic cards
•
PC motherboards
•
Switching power supply post-regulation
•
Telecom equipment
•
DVD video player
Features
•
Ultra Low Dropout (400mV at 1A)
•
Enable pin implements sequencing
•
Vout tolerance less than
1.5%
over
•
•
•
•
•
•
temperature
Stable with low cost 1uF capacitor
Thermal protection with hysteresis
Short circuit protection
Adjustable output
The AQ112 is featured in the new
SOT223 4-lead
TetraPack
TM
package.
RoHS compliant
available
Typical Application
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AQ112
Acutechnology Semiconductor Inc.
AQ112
Pin Configuration
Pin Descriptions
Pin Name
V
IN
E
NABLE
Ground/Adjust
V
OUT
Function
+ Unregulated Input Voltage, Collector of Pass Transistor
Active high, E
NABLE
> (0.95V + V
OUT
), Chip bias circuit supply
OFF low, E
NABLE
< 0.25V
Ground or Adjust pin (Connect to resistive feed back divider)
Regulated Output
Functional Block Diagram
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Rev. 1.6
September 13, 2006
Acutechnology Semiconductor Inc.
AQ112
Ordering Information
Device
AQ112
AQ112
AQ112
AQ112
AQ112
AQ112
AQ112
AQ112
Note:
The
Operating Tj
0C˚
≤
125C˚
0C˚
≤
125C˚
0C˚
≤
125C˚
0C˚
≤
125C˚
0C˚
≤
125C˚
0C˚
≤
125C˚
0C˚
≤
125C˚
0C˚
≤
125C˚
%Tol
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
PKG Type
SOT-223-4
SOT-223-4
SOT-223-4
SOT-223-4
SOT-223-4
SOT-223-4
SOT-223-4
SOT-223-4
V
OUT
1.8V
1.8V
2.5V
2.5V
3.3V
3.3V
ADJ
ADJ
Wrap
T&R
T&R
T&R
T&R
T&R
T&R
T&R
T&R
Ordering Number
AQ112CY-S4-18-TR
AQ112CY-S4-18-TRL
AQ112CY-S4-25-TR
AQ112CY-S4-25-TRL
AQ112CY-S4-33-TR
AQ112CY-S4-33-TRL
AQ112CY-S4-AJ-TR
AQ112CY-S4-AJ-TRL
TRL parts are Lead Free and RoHS compliant.
Absolute Maximum Ratings
Stress greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. These stress ratings only, and functional operation of the device at these or any conditions beyond
those indicated under recommended Operating Conditions is not implied. Exposure to “Absolute Maximum
Rating” for extended periods may affect device reliability. Use of standard ESD handling precautions is
required.
Parameter
Maximum V
IN
Maximum V
ENABLE
Power Dissipation (Internally limited)
Maximum Junction Temperature
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 4sec.) SOT- 223 package
150
0 to 125
-65 to 150
300
°C
°C
°C
°C
Value
18
18
Units
Volts
Volts
Thermal Management
Thermal Resistance (Junction to TAB)
SOT-223
Thermal Resistance (Junction to Ambient)
SOT-223 (tab soldered to 1 in
2
1 oz. copper PCB)
Typical Value
15
Typical Value
46
Units
°C/W
Units
°C/W
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Rev. 1.6
September 13, 2006
Acutechnology Semiconductor Inc.
AQ112
Electrical Specifications
Electrical characteristics are guaranteed over the full temperature range 0ºC <Tj< 125ºC. Ambient temperature
must be de-rated based upon power dissipation and package thermal characteristics. Unless otherwise
specified: V
IN
= V
EN
= (V
OUT
+ 1.5V), I
OUT
= 10 mA, Tj = 25C. All values in
bold
are over the full temperature
range.
Symbol
VOUT
LNREG
LDREG
Parameter
Output Voltage
(1)
Line Regulation
(1)
Load Regulation
(1)
Conditions
Min
-1
0°C
≤Tj ≤
125°C
∆V
IN
= V
OUT
+ (1.5V to 10V)
∆I
OUT
= (10mA to 1 Amp)
I
OUT
= 100 mA
VD
Drop out Voltage
(1, 2)
I
OUT
= 500 mA
I
OUT
= 1A
ISC
IQ
VIL
VIH
I
EN
ON
Current Limit
(1)
Quiescent Current
Enable Pin Voltage (OFF)
Enable Pin Voltage (ON)
Enable Current ON
V
EN
-V
OUT
= 2V
V
EN
= 5V
0°C
≤Tj ≤
125°C
With respect to GND
With respect to V
OUT
I
OUT
= 10 mA
I
OUT
= 500 mA
I
OUT
= 1A
VADJ
IADJ
∆
IADJ
I
QMIN
TC
TS
V
N
PSRR
TSD
TSD
HYST
Reference Voltage
Adjust Pin Current (5)
Adjust Pin Current (5)
Change
Minimum Load Current (5)
Temperature Coefficient
Temperature Stability
RMS Output Noise
(3)
Ripple Rejection Ratio
(4)
Thermal Shutdown
TSD Hysteresis
Vin = 5V
Junction Temperature
60
10mA
≤
I
OUT
≤
1Amp
1.4
≤
V
IN
≤
18V
To Maintain regulation
Note (5)
0°C
≤Tj ≤
125°C
1.208
1.202
20
0.2
0.5
0.005
0.5
0.003
72
150
25
0.25
0.45
0.92
0.3
2.5
5.0
1.220
0.95
0.5
5.0
10.0
1.232
1.238
40
5.0
2.0
1.1
-1.5
Typ
V
OUT
V
OUT
0.035
0.2
50
200
350
1.5
7.0
9.0
10.0
Max
+1
+1.5
0.2
0.4
80
250
400
Units
%
%
%
%
mV
mV
mV
A
mA
mA
V
V
mA
mA
mA
V
V
µA
µA
mA
%/°C
%/°C
%
V
OUT
dB
°C
°C
Notes:
(1) Low duty cycle pulse testing with Kelvin connections required.
(2) Measure (V
IN
- V
OUT
) when
∆V
OUT
,
OR
∆V
REF
= 1%
(3) Bandwidth of 10Hz to 10kHz
(4) 120Hz input ripple
(5) Adjustable version only
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Rev. 1.6
September 13, 2006
Acutechnology Semiconductor Inc.
AQ112
Typical Response Curves
www.acutechnology.com
5
Rev. 1.6
September 13, 2006
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