AS3819
500 mA, Low-Noise LDO Voltage Regulator
(
ADVANCED INFORMATION
)
FEATURES
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•
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•
•
•
•
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Ultra-Low Noise Output LDO
1% Initial Accuracy At 500mA
Very Low Quiescent Current
Low Dropout Voltage (300mV At 500mA)
Current & Thermal Limiting
Reverse-Battery Protection
Several Fix Output Voltages, 2.5, 3.3, 5.0V & Adjustable
Zero Off-Mode Current
Packages offered SO-8, TO-263, SOT-223, SOT-23 & TO-220
Pin Compatible to MIC5209 (Fixed Option Only)
APPLICATIONS
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Battery Powered Systems
Cordless Telephones
Radio Control Systems
Portable/Palm Top/Notebook Computers
Portable Consumer Equipment
Portable Instrumentation
Bar Code Scanners
SMPS Post-Regulator
PRODUCT DESCRIPTION
The AS3819 is a low powered positive voltage regulator with ultra low noise output and very low voltage dropout. In addition, this
device offers very low quiescent current of approximately 800uA at 100mA output. The AS3819 initial tolerance is less than 1% max
with logic compatible ON/OFF switching input. The unique feature of AS3819 includes a reference bypass pin for the best results of
low noise.
This device is an excellent choice for the use in battery-powered applications such as cordless telephones, radio control systems, and
portable computers. When disable power consumption drop to nearly zero. This device has a very low output temperature coefficient,
making it a low power voltage reference. The key features include protection against reversed battery, fold-back current limiting, and
automotive load dump protection.
The AS3819 is available in several fixed voltages 2.5V, 3.3V, 5.0V or adjustable output. This device is offered in SO-8, 3 and 5 pin
TO-263, SOT-223, 5-pin SOT-23 & 3-pin TO-220. These packages offer all the features and adjustable output.
D
A
TO-263 (T5)
5-PIN
AS3819T5-X
A
V
C
N
•
D
E
ORDERING INFORMATION
SO-8 (S1)
AS3819S1-X
TO-263 (T)
3-PIN
AS3819T-X
SOT-223 (M3)
AS3819M3-X
SOT-23-5(M5)
AS3819M5-X
TO-220 (U)
AS3819U-X
OPER JUNCTION RANGE
-40°C to +125°C
TO-263-3 Package
Package Marking Information for SOT-23.
X = Output Voltage 2.5 for 2.5V, 3.3V ect; Blank is Adj.
For other output voltages consult factory.
8-Pin Surface Mount (S1)
EN
V
IN
1
2
8
7
GND
GND
GND
GND
TO-263-5 Package
AS3819
AS3819
1 2 3 4 5
1)
EN
2)
3)
4)
5)
V
IN
GND
V
OUT
ADJ/BYP
AS3819
1
2
3
MARKING INFORMATION
(SOT-23 Only)
V
OUT
NC
3
4
6
5
Top View
Voltage
ADJ
2.5V
3.3V
5.0V
Marking
A0XX
A8XX
A1XX
A9XX
V
Top View
IN
GND V
OUT
Front View
SOT-223
EN
SOT-23-5
GND
V
IN
3
2
1
TO-220
AS3819
V
OUT
GND
V
IN
AS3819
1
2
3
4
AS3819
5
Front View
XX Production Reference Code.
V
GND
V
IN
OUT
ADJ/BYP
V
OUT
Front View
Top View
Rev. 10/2/00
AS3819
ABSOLUTE MAXIMUM RATINGS
Power Dissipation...................................... Internally Limited
Lead Temp. (Soldering, 5 Seconds) ............................ 260°C
Operating Junction Temperature Range ..... -40°C to +125°C
Input Supply Voltage........................................-20V to +20V
Enable Input Voltage........................................-20V to +20V
RECOMMENDED OPERATING CONDITIONS
Input Voltage.................................................. +2.5V to+16V
Operating Junction Temperature Range ..... -40°C to +125°C
Enable Input Voltage............................................. 0V to V
IN
ELECTRICAL CHARACTERISTICS
T
J
= 25°C, V
OUT
+ 1V, I
L
= 100µA, C
L
= 1µF, and V
ENABLE
> 2.4V. Unless otherwise specified
boldface
applies over the junction
temperature range
Parameter
Test Conditions
Typ
Min
Max
Units
Output Voltage Tolerance
Output Voltage Temperature Coef.
(∆V/∆T)
Line Regulation (∆V/V)
Load Regulation (∆V/V)
Dropout Voltage
(V
IN
- V
O
)
I
L
= 100
µA
I
L
= 500
µA
57
V
IN
= V
OUT
+ 1V to 16V
I
L
= 0.1mA to 500mA
I
L
= 100
µA
I
L
= 50 mA
I
L
= 150 mA
I
L
= 500 mA
Quiescent Current (I
GND
)
Ground Pin Current
(I
GND
)
V
ENABLE
< 0.6V
V
ENABLE
< 0.25V
I
L
= 100
µA
I
L
= 50 mA
I
L
= 150 mA
I
L
= 500 mA
Ripple Rejection (PSRR)
Current Limit (I
LIMIT
)
Output Noise (e
NO
)
Input Voltage Level
Logic Low (V
IL
)
Input Voltage Level
Logic High (V
IH
)
ENABLE Input Current
Thermal Resistance
0.04
0.05
10
125
180
340
0.05
0.10
110
360
1.3
13.0
55
800
390
0.1
0.2
60
80
175
250
350
450
550
700
3
8
150
190
650
900
2.0
2.5
25.0
30.0
950
-1
-2
+1
+2
%
ppm/°C
%/V
%
mV
µA
µA
mA
dB
mA
µV
RMS
V
OUT
= 0V
I
L
= 50mA, C
L
= 1.0µF
(10Hz – 100KHz)
OFF
ON
V
IL
< 0.6V
V
IH
> 2.0V
TO-220
DD Package
SOT-223
SOT-23-5
SO-8
0.6
2
0.01
2
Junction to Tab
Junction to Ambient
Junction to Tab
Junction to Ambient
Junction to Tab
Junction to Ambient
Junction to Tab
Junction to Ambient
Junction to Tab
Junction to Ambient
2
20
3.0
60
3.0
60
15
156
N/A
220
N/A
180
V
V
µA
°C/W
Rev. 10/2/00
AS3819
Ground Current Vs. Load Current
7.0
6.0
5.0
I Gnd (mA)
4.0
3.0
2.0
1.0
0.0
0
100
200
IL (mA)
300
400
500
3.3V Device
Vin = 4.3V
CL = 1.0uF
I Gnd (uA)
160
150
140
130
120
110
100
90
80
70
60
4
6
8
10
Vin (V)
12
14
16
3.3V Device
IL = 100uA
CL = 1.0uF
Ground Current Vs. Input Voltage
Ground Current Vs. Load Current
(In Dropout)
14.0
12.0
10.0
I Gnd (mA)
8.0
6.0
4.0
2.0
0.0
0
100
200
IL (mA)
300
400
500
3.3V Device
Vin = 4.3V
CL = 1.0uF
Vout (V)
Output Voltage Vs. Input Voltage
3.350
3.345
3.340
3.335
3.330
3.325
3.320
3.315
3.310
3.305
3.300
3.295
3.290
4
6
8
10
Vin (V)
12
14
16
3.3V Device
IL = 100uA
CL = 1.0uF
Dropout Voltage Vs. Load Current
350
300
250
Dropout (mV)
200
150
100
50
0
0
100
200
IL (mA)
300
400
500
3.3V Device
Vin = 3.2V
CL = 1.0uF
Vout (V)
3.316
3.314
3.312
3.310
3.308
3.306
3.304
3.302
3.300
0
Output Voltage Vs. Load Current
3.3V Device
Vin = 4.3V
CL = 1.0uF
100
200
IL (mA)
300
400
500
Rev. 10/2/00
AS3819
Ground Current Vs. Temperature
130
120
110
I Gnd (uA)
100
90
80
70
-40
-20
0
20
40
60
80
100
120
Temperature (Degree C)
3.3V Device
Vin = 4.3V
CL = 1.0uF
IL = 100uA
360
340
320
I Gnd (uA)
300
280
260
240
220
200
-40
-20
0
20
40
60
80
100
120
Temperature (Degree C)
3.3V Device
Vin = 4.3
CL = 1.0uF
IL = 50mA
Ground Current Vs. Temperature
Ground Current Vs. Temperature
8.0
14.0
13.5
7.5
I Gnd (mA)
I Gnd (mA)
3.3V Device
Vin = 4.3V
CL = 1.0uF
IL = 500mA
13.0
12.5
12.0
11.5
11.0
6.0
-40
-20
0
20
40
60
80
100
120
Temperature (Degree C)
10.5
-40
Ground Current in Dropout Vs. Temperature
3.3V Device
Vin = 4.3V
CL = 1.0uF
IL = 500mA
7.0
6.5
-20
0
20
40
60
80
100
120
Temperature (Degree C)
Enable Voltage (On Threshold) Vs. Input Voltage
1.30
1.25
VEN, On Threshold (V)
1.20
1.15
1.10
1.05
1.00
4
6
8
10
Vin (V)
12
14
16
3.400
3.380
3.3V Device
CL =1.0uF
IL = 100uA
Vout (V)
3.360
3.340
3.320
3.300
3.280
3.260
3.240
3.220
3.200
-40
-20
Output Voltage Vs. Temperature
3.3V Device
Vin = 4.3V
CL = 1.0uF
IL = 500uA
0
20
40
60
80
100
120
Temperature (Degree C)
Rev. 10/2/00
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