AQ111
Low Dropout
1 Amp Voltage Regulator
Product Specification
Revision 1.5
September 13, 2006
General Description
The AQ111 is a 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.
AQ111 is the only 1 Amp LDO regulator offered
in the tiny PSOT-23 package. PSOT-23 is
modified for lower thermal resistance and fits in
the standard SOT-23 foot print. With a dropout
voltage of less than one volt, the AQ111 can be
used in applications where drop out voltage and
size are an issue.
To assure accuracy within 1.5% over
temperature the heart of the AQ111 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
•
Available in the tiny
PSOT-23
package
•
Vout tolerance 1.5% over temperature
•
Stable with low cost 1uF capacitor
•
Low ground current <1.5 mA
•
Low dropout voltage (950 mV at 1 Amp)
•
Thermal protection with hysteresis
•
Short circuit protection
•
Offered with 1.8V, 2.5V, and 3.3V fixed or
•
adjustable output
RoHS complaint
available
Typical Application
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AQ111
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AQ111
Pin Configuration
PSOT-23-6
Pin Descriptions
Pin Name
V
IN
V
OUT
Ground/Adjust
Function
Accepts + VCC
Regulated Output
- VCC for fixed option / Adjust pin for adjustable option
Functional Block Diagram
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AQ111
Ordering Information
Device
AQ111
AQ111
AQ111
AQ111
AQ111
AQ111
AQ111
AQ111
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
PSOT-23-6
PSOT-23-6
PSOT-23-6
PSOT-23-6
PSOT-23-6
PSOT-23-6
PSOT-23-6
PSOT-23-6
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
AQ111CY-M7-18-TR
AQ111CY-M7-18-TRL
AQ111CY-M7-25-TR
AQ111CY-M7-25-TRL
AQ111CY-M7-33-TR
AQ111CY-M7-33-TRL
AQ111CY-M7-AJ-TR
AQ111CY-M7-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
Power Dissipation (Internally limited)
Maximum Junction Temperature
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 4sec.) SOT packages
Value
18
Units
Volts
150
0 to 125
-65 to 150
300
°C
°C
°C
°C
Thermal Management
Thermal Resistance (Junction to tab)
PSOT-23-6 (tab is pins 1,2,5, & 6)
Typical Value
25
Units
°C/W
Thermal Resistance (Junction to Ambient)
PSOT-23-6 (Pins 1,2,5, & 6 soldered to 1 in
2
1 oz. Copper PCB)
Typical Value
55
Units
°C/W
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Acutechnology Semiconductor Inc.
AQ111
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
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
= 1 Amp
ISC
IQON
Current Limit
(1)
Quiescent Current ON
V
IN
-V
OUT
= 2V
V
IN
= 5V
0°C
≤Tj ≤
125°C
Adjustable version only
0°C
≤Tj ≤
125°C
Adjustable version only
10mA
≤
I
OUT
≤
1Amp
1.4
≤
V
IN
≤
18V
To Maintain regulation
1.208
1.202
20
0.2
0.5
0.005
0.5
0.003
Vin = 5V
Junction Temperature
60
72
150
25
1.220
1.1
-1.5
Typ
V
OUT
V
OUT
0.035
0.2
0.91
0.93
0.95
1.5
7.5
9.0
10.0
1.232
1.238
40
5.0
2.0
Max
+1
+1.5
0.2
0.4
0.95
0.95
1.0
Units
%
%
%
%
V
V
V
A
mA
mA
V
V
µA
µA
mA
%/°C
%/°C
%
V
OUT
dB
°C
°C
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
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. 1.5
September 13, 2006
Acutechnology Semiconductor Inc.
AQ111
Typical Response Curves
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Rev. 1.5
September 13, 2006
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