Rev. 10/2/00
ADVANCED
AS3819
500 mA, Low-Noise LDO Voltage Regulator
(ADVANCED INFORMATION)
FEATURES APPLICATIONS
• Ultra-Low Noise Output LDO • Battery Powered Systems
• 1% Initial Accuracy At 500mA • Cordless Telephones
• Very Low Quiescent Current • Radio Control Systems
• Low Dropout Voltage (300mV At 500mA) • Portable/Palm Top/Notebook Computers
• Current & Thermal Limiting • Portable Consumer Equipment
• Reverse-Battery Protection • Portable Instrumentation
• Several Fix Output Voltages, 2.5, 3.3, 5.0V & Adjustable • Bar Code Scanners
• Zero Off-Mode Current • SMPS Post-Regulator
• Packages offered SO-8, TO-263, SOT-223, SOT-23 & TO-220
• Pin Compatible to MIC5209 (Fixed Option Only)
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.
ORDERING INFORMATION
SO-8 (S1) TO-263 (T)
3-PIN
TO-263 (T5)
5-PIN
SOT-223 (M3) SOT-23-5(M5) TO-220 (U) OPER JUNCTION RANGE
AS3819S1-X AS3819T-X AS3819T5-X AS3819M3-X AS3819M5-X AS3819U-X -40°C to +125°C
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.
MARKING INFORMATION
(SOT-23 Only)
Top View
2
1
3
4
8
7
6
5
AS3819
V
OUT
NC
GND
GND
GND
GNDV
IN
EN
8-Pin Surface Mount (S1)
TO-263-5 Package
Top View
45
AS3819
V
OUT
V
IN
EN
1)
3)
4)
5)
2)
123
ADJ/BYP
GND
Front View
TO-263-3 Package
V
OUT
GND
V
IN
1
AS3819
23
TO-220
Front View
AS3819
V
OUT
GND
V
IN
AS3819
132
V
OUT
GND
SOT-223
Front View
V
IN
Top View
1
23
ADJ/BYP
V
IN
V
OUT
AS3819
EN GND
45
SOT-23-5
Voltage Marking
ADJ A0XX
2.5V A8XX
3.3V A1XX
5.0V A9XX
XX Production Reference Code.
Rev. 10/2/00
AS3819
ABSOLUTE MAXIMUM RATINGS RECOMMENDED OPERATING CONDITIONS
Power Dissipation...................................... Internally Limited Input Voltage .................................................. +2.5V to+16V
Lead Temp. (Soldering, 5 Seconds) ............................ 260°C Operating Junction Temperature Range ..... -40°C to +125°C
Operating Junction Temperature Range ..... -40°C to +125°C Enable Input Voltage............................................. 0V to VIN
Input Supply Voltage........................................-20V to +20V
Enable Input Voltage........................................-20V to +20V
ELECTRICAL CHARACTERISTICS
TJ = 25°C, VOUT + 1V, IL = 100µA, CL = 1µF, and VENABLE > 2.4V. Unless otherwise specified boldface applies over the junction
temperature range
Parameter Test Conditions Typ Min Max Units
Output Voltage Tolerance IL = 100 µA
IL = 500 µA
-1
-2
+1
+2
%
Output Voltage Temperature Coef.
(∆V/∆T)
57
ppm/°C
Line Regulation (∆V/V) VIN = VOUT + 1V to 16V 0.04 0.1 %/V
Load Regulation (∆V/V) IL = 0.1mA to 500mA 0.05 0.2 %
IL = 100 µA 10 60
80
IL = 50 mA 125 175
250
IL = 150 mA 180 350
450
Dropout Voltage
(VIN- VO)
IL = 500 mA 340 550
700
mV
Quiescent Current (IGND) VENABLE < 0.6V
VENABLE < 0.25V
0.05
0.10
3
8
µA
IL = 100 µA 110 150
190
IL = 50 mA 360 650
900
IL = 150 mA 1.3 2.0
2.5
Ground Pin Current
(IGND)
IL = 500 mA 13.0 25.0
30.0
Ripple Rejection (PSRR) 55 dB
Current Limit (ILIMIT) VOUT = 0V 800 950 mA
Output Noise (eNO) IL = 50mA, CL = 1.0µF
(10Hz – 100KHz)
390
µVRMS
OFF
0.6
V
Input Voltage Level
Logic Low (VIL)
Input Voltage Level
Logic High (VIH)
ON
2
V
ENABLE Input Current VIL < 0.6V
VIH > 2.0V
0.01
2
2
20
Junction to Tab 3.0
TO-220
Junction to Ambient 60
Junction to Tab 3.0
DD Package
Junction to Ambient 60
Junction to Tab 15
SOT-223
Junction to Ambient 156
Junction to Tab N/A
SOT-23-5
Junction to Ambient 220
Junction to Tab N/A
Thermal Resistance
SO-8
Junction to Ambient 180
°C/W
µA
mA
µA
Rev. 10/2/00
AS3819
TYPICAL APPLICATION
+
+ GND
EN
V
IN V
OUT
BYP
(Optn.)
ENABLE may be tied directly to V IN
AS3819
1
2
3 4
5
Rev. 10/2/00
AS3819
Ground Current Vs. Input Voltage
60
70
80
90
100
110
120
130
140
150
160
4 6 8 10121416
Vin (V)
I Gnd (uA)
3.3V Device
IL = 100uA
CL = 1.0uF
Ground Current Vs. Load Current
(In Dropout)
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
0 100 200 300 400 500
IL (mA)
I Gnd (mA)
3.3V Device
Vin = 4.3V
CL = 1.0uF
Output Voltage Vs. Input Voltage
3.290
3.295
3.300
3.305
3.310
3.315
3.320
3.325
3.330
3.335
3.340
3.345
3.350
4 6 8 10121416
Vin (V)
Vout (V)
3.3V Device
IL = 1 00uA
CL = 1.0uF
Dropout Voltage Vs. Load Current
0
50
100
150
200
250
300
350
0 100 200 300 400 500
IL (mA)
Dropout (mV)
3.3V Device
Vin = 3.2V
CL = 1.0uF
Output Voltage Vs. Load Current
3.300
3.302
3.304
3.306
3.308
3.310
3.312
3.314
3.316
0 100 200 300 400 500
IL (mA)
Vout (V)
3.3V Device
Vin = 4.3V
CL = 1.0uF
Ground Current Vs. Load Current
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
0 100 200 300 400 500
IL (mA)
I Gnd (mA)
3.3V Device
Vin = 4.3V
CL = 1.0uF
Rev. 10/2/00
AS3819
Ground Current Vs. Temperature
70
80
90
100
110
120
130
-40-20 0 20406080100120
Temperature (Degree C)
I Gnd (uA)
3.3V Device
Vin = 4.3V
CL = 1.0uF
IL = 1 00 uA
Ground Current Vs. Temperature
6.0
6.5
7.0
7.5
8.0
-40 -20 0 20 40 60 80 100 120
Temperature (Degree C)
I Gnd (mA)
3.3V Device
Vin = 4.3V
CL = 1.0uF
IL = 500mA
Ground Current in Dropout Vs. Temperature
10.5
11.0
11.5
12.0
12.5
13.0
13.5
14.0
-40-20 0 20406080100120
Temperature (Degree C)
I Gnd (mA)
3.3V Device
Vin = 4.3V
CL = 1.0uF
IL = 500mA
Enable Voltage (On Threshold) Vs. Input Voltage
1.00
1.05
1.10
1.15
1.20
1.25
1.30
4 6 8 10121416
Vin (V)
VEN, On Threshold (V)
3.3V Device
CL =1.0uF
IL = 1 00uA
Ground Current Vs. Temperature
200
220
240
260
280
300
320
340
360
-40 -20 0 20 40 60 80 100 120
Temperature (Degree C)
I Gnd (uA)
3.3V Device
Vin = 4.3
CL = 1.0uF
IL = 50mA
Output Voltage Vs. Temperature
3.200
3.220
3.240
3.260
3.280
3.300
3.320
3.340
3.360
3.380
3.400
-40 -20 0 20 40 60 80 100 120
Temperature (Degree C)
Vout (V)
3.3V Device
Vin = 4.3V
CL = 1.0uF
IL = 500uA
Rev. 10/2/00
AS3819
Rev. 10/2/00
V
OUT
GND AS3819
Top View
EN
BYP
(Optn)
V
IN
+
+
Fig. 1
1
2
3
5
4
Hi-ON
Lo-OFF
SOT-23
AS3819
Application Hints
The AS3819 requires an output capacitor for device stability.
The value required varies greatly depending upon the
application circuit. The high frequency characteristics of
electrolytic capacitors depend greatly on the type and also on
the manufacturer. Sometimes bench testing is the only means
to determine the proper capacitor type and value. The high
quality 2.2µF aluminum electrolytic capacitor covers all
general application circuits; this stability can be obtained with
a tantalum electrolytic value of 1µF.
In general, linear regulator stability decreases with higher
output currents. In most applications the AS3815 is
operating at few milliamps. In these applications the output
capacitance can be further reduced. For example, when the
regulator is running at 10mA output current the output
capacitance value is half compared to the same regulator
that is running at 150mA.
With the AS3819 adjustable regulator, the minimum value
of output capacitance is a function of the output voltage.
The value decreases with higher output voltages, since the
closed loop gain is increased.
Typical Applications Circuits
The AS3819 provides access to the internal reference. A 10µF capacitor on the Ref BYP pin will provide a significant reduction in
output noise. This pin may be left unconnected if the output noise is not a major concern. The AS3819 start-up speed is inversely
proportional to the size of its capacitor. Applications requiring a slow ramp-up of output voltage should consider larger values of
CBYP. If the rapid turn-ON is necessary, omit bypass capacitor.
Figure 1 shows AS3819 standard application circuit. The EN (enable) pin is pulled high (>2.0V) to enable the regulator. To disable
the regulator, EN < 0.6V.
The AS3819 in figure 2 shows adjustable output voltage configuration. Two resistors set the output voltage. The formula for output
voltage is:
Resistor values are not critical as the Adj pin has high input impedance, for best results use resistors of 47kΩ or less. A capacitor for
Adj to ground will provide improved noise performance.
R2
V
IN
V
OUT
GND
Top View
EN
Byp
(Optn)
+
+
ADJ
R1
R2
Fig. 2
Hi-ON
Lo-OFF
1
2
34
5
AS3819
SOT-23
VOUT = 1.235V x 1 + R1
Rev. 10/2/00
AS3819
PACKAGE DRAWING
SOIC-8 (S)
Pin 1
1.27 (0.50)
BSC
3.8 (0.150)
4.0 (0.158)
4.6 (0.181)
5.2 (0.205)
5.8 (0.228)
6.2 (0.244)
4.8 (0.188)
5.0 (0.197)
0.49 (0.019)
0.56 (0.022)
0.35 (0.014)
0.45 (0.018)
0.10 (0.004)
0.20 (0.008) 0.19 (0.007)
0.22 (0.009)
1.35 (0.053)
1.75 (0.069)
0.61 (0.024)
0.78 (0.031)
3
°
-6
°
0.64 (0.025)
0.77 (0.030)
45
°
7
°
(4 PLCS)
7
°
(4 PLCS)
0.37 (0.015)
BSC
Rev. 10/2/00
AS3819
PACKAGE DRAWING
TO-263-3L (T)
0.103 BSC 0.050 (1.270)
0.600
+
-
0.025
0.405 0.005 0.055 (1.397)
(10.287 0.127)
±
±
0.356 0.005
(9.042 0.127)
±
±
(15.24 0.635)
±
(2.616) 0.032
+
-
0.001
(0.813 0.025)
+
-
0.176 0.005
0.050 0.002
0.015
+
-
0.003
0° 8°
(0.381 0.074)
+
-
0.100 0.010
(2.540 0.254)
±
±
(4.470 0.127)
±
(1.270 0.051)
±
±
±
Rev. 10/2/00
AS3819
PACKAGE DRAWING
TO-263-5L (T)
0.405 0.005
0.055 (1.397)
0.356 0.005
±
(10.287 ± 0.127)
±
(9.042 0.127)
±
(15.24 0.635)
±
0.600 0.025
±
(1.702 0.127)
±
0.067 0.005
±
(0.813 0.076)
±
0.032 0.003
±
0° 8°
0.176 0.005
±(4.470 0.127)
±
0.050 0.002
±(1.270 0.051)
±
0.100 0.010
±
(2.540 0.254)
±
0.015 0.003
±
(0.381 0.074)
±
Rev. 10/2/00
AS3819
PACKAGE DRAWING
SOT-223-3L (M3)
0.116
0.124
0.146
0.130
0.295
0.264
0.041
0.033
0.0905 NOM
0.181 NOM
0.264
0.248
0.0040
0.0008
0.033
0.025
0.067
0.028
10°C Max
0.014
0.010
10
°
C
16
°
C
10
°
C
16
°
C
Rev. 10/2/00
AS3819
PACKAGE DRAWING
SOT-23-5L (M5)
MILLIMETERS
SYMBOL
0
0.90
0.30
0.80 REF
2.70
0.10
1.40
1.70
0.95 BSC.
MIN 0.2
2.50
MIN. MAX MIN. MAX.
A
A1
A2
B
C
D
E
e
e1
H
L
0
.035
.012
.0315 REF
.106
.004
.055
.066
.037 BSC.
MIN .0078
.098
0.10
1.30
0.50
3.10
0.35
1.80
2.10
3.00
.004
.051
.019
.122
.0137
.071
.082
.118
INCHES
NOTE:
1. REFER TO APPLICABLE
2. CONTROLLING DIMENTION : MILLIMETER
3. PACKAGE SURFACE FINISHING TO BE SMOOTH
FINISH.
L
A1 C
A2
A
D
B (5 PLACES)
H
E
e1
e
Rev. 10/2/00
AS3819
PACKAGE DRAWING
TO-220-3L (U)
0.408 ± 0.013
(10.36 ± 0.33)
0.110 ± 0.010
(2.794 ± 0.254) 0.250 ± 0.010
(6.350 ± 0.254)
0.151D ± 0.002
(3.835 D ± 0.051)
0.180 ± 0.005
(4.572 ± 0.127)
0.050 ± 0.002
(1.270 ± 0.051)
0.340 ± 0.010
(8.636 ± 0.254)
0.150 MIN
(3.81 MIN)
0.410
(10.41)
0.100 ± 0.010
(2.540 ± 0.254)
0.032 ± 0.005
(0.813 ± 0.127)
0.540 ± 0.015
(13.720 ± 0.381)
0.050 TYP
(1.27 TYP)
0.200 ± 0.010
(5.080 ± 0.254) 0.015 ± 0.010/-0.002
(0.381± 0.254/-0.051)
0.015 ± 0.010/-0.015
(2.667± 0.254/-0.381)
1.020 ± 0.015
(25.910 ± 0.381)
SEATING PLANE
Tapered 1
o
2 Sides
7
o
Typ.
