AQ533
Ultra-Low Dropout
500mA Voltage Regulator
Product Specification
Revision 1.7
September 13, 2006
General Description
The AQ533 is an ultra-low dropout voltage
regulator capable of delivering
500 mA
to the
load. It is adjustable and can set a precise
voltage from 1.22V to 12V with two external
resistors. The AQ533 meets all specifications
down to 1.22V output, unlike CMOS LDO’s which
loose performance with outputs below 2.25V.
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. This also allows for a separate bias
connection from the pass transistor in order to
achieve
ultra low dropout
from V
IN
to V
OUT
.
Reverse current protection
blocks current
flowing from V
OUT
to V
IN
when the AQ533 is
disabled. No current flows.
To assure accuracy within
1.5% over
temperature,
the heart of the AQ533 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
•
Cell Phones
•
DVD video player
Features
•
Low dropout voltage (350mV at
500 mA)
•
Enable pin implements sequencing
•
Reverse current protection
•
Vout tolerance less than
1.5%
over
•
•
•
•
•
•
temperature
Featured in the very small
SOT-23
package
Stable with low cost 1
µ
F capacitor
Low ground current <100
µA
Thermal protection with hysteresis
Short circuit protection
RoHS compliant
available
Typical Application
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AQ533
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AQ533
Pin Configuration
Pin Descriptions
Pin Name
V
IN
Ground
E
NABLE
Adjust
V
OUT
Function
+ Unregulated Input Voltage, Collector of Pass Transistor
- Ground
Active high, E
NABLE
> (0.95V + V
OUT
), Chip bias circuit supply
OFF low, E
NABLE
< 0.25V
Adjust input. Connect to resistive feed back divider.
Regulated Output
Functional Block Diagram
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Rev. 1.7
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Acutechnology Semiconductor Inc.
AQ533
Ordering Information
Device
AQ533
AQ533
AQ533
AQ533
AQ533
AQ533
AQ533
AQ533
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-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
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
AQ533CY-M5-18-TR
AQ533CY-M5-18-TRL
AQ533CY-M5-25-TR
AQ533CY-M5-25-TRL
AQ533CY-M5-33-TR
AQ533CY-M5-33-TRL
AQ533CY-M5-AJ-TR
AQ533CY-M5-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, 4 sec.) SOT- 23-5 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 Ambient)
SOT-23-5 (minimum foot print)
Typical
Value
220
Typical
Value
170
Units
°C/W
Units
°C/W
Thermal Resistance (Junction to Ambient)
SOT-23-5 (Soldered to 1 in
2
1 oz. copper PCB)
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Rev. 1.7
September 13, 2006
Acutechnology Semiconductor Inc.
AQ533
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
ENABLE
= V
IN
= (V
OUT
+ 1.5V), I
OUT
= 10 mA, Tj = 25C. 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
EN
= V
OUT
+ (1.5V to 10V)
∆I
OUT
= (10mA to 500 mA)
I
OUT
= 100 mA
VD
Dropout Voltage
(1, 2)
I
OUT
= 250 mA
I
OUT
= 500 mA
ISC
I
GND
I
GND
VIL
VIH
Current Limit
(1)
Ground Current ON
Ground Current ON (5)
Enable Pin Voltage (OFF)
Enable Pin Voltage (ON)
Adjustable version
With respect to GND
With respect to V
OUT
I
OUT
= 10 mA
I
EN
ON
Enable Current ON
I
OUT
= 250 mA
I
OUT
= 500 mA
V
ADJ
I
QMIN
TC
TS
V
N
PSRR
TSD
TSD
HYST
Reference Voltage
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
Adjustable version only
0°C
≤Tj ≤
125°C
To maintain regulation
1.208
1.202
0.5
0.005
0.5
0.003
72
150
25
0.25
V
EN
-V
OUT
= 2V
600
-1.5
Typ
V
OUT
V
OUT
0.035
0.2
50
150
300
800
100
65
0.45
0.92
0.3
1.8
3.8
1.220
0.95
0.5
3.0
5.0
1.232
1.238
2.0
150
80
Max
+1
+1.5
0.2
0.4
80
200
350
Units
%
%
%
%
mV
mV
mV
mA
µA
µA
V
V
mA
mA
mA
V
V
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. 1.7
September 13, 2006
Acutechnology Semiconductor Inc.
AQ533
Application Notes
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Rev. 1.7
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