Rev. 10/30/00
ADVANCED
SPX3819
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 SPX3819 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 SPX3819 initial tolerance is less than 1%
max with logic compatible ON/OFF switching input. The unique feature of SPX3819 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 SPX3819 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.
MARKING
INFORMATION
PIN
CONNECTIONS
(SOT-23 Only)
TO-263-5 Package
Top View
4 5
SPX3819
V
OUT
V
IN
EN
1)
3)
4)
5)
2)
1 2 3
ADJ/BYP
GND
Front View
TO-263-3 Package
V
OUT
GND
V
IN
1
SPX3819
2
3
TO-220
Front View
SPX3819
V
OUT
GND
V
IN
SPX3819
1
3
2
V
OUT
GND
SOT-223
Front View
V
IN
Top View
1
2
3
ADJ/BYP
V
IN
V
OUT
SPX3819
EN
GND
4
5
SOT-23-5
Voltage Marking
ADJ A0XX
2.5V A8XX
3.3V A1XX
5.0V A9XX
XX Production Reference Code.
Rev. 10/30/00
SPX3819
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 V
IN
Input Supply Voltage........................................-20V to +20V
Enable Input Voltage........................................-20V to +20V
ELECTRICAL CHARACTERISTICS
T
J
= 25
°C, V
OUT
+ 1V, I
L
= 100
µA, C
L
= 1
µF, 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
I
L
= 100
µA
I
L
= 500
µA
-1
-2
+1
+2
%
Output Voltage Temperature Coef.
(
∆V/∆T)
57
ppm/
°C
Line Regulation (
∆V/V)
V
IN
= V
OUT
+ 1V to 16V
0.04
0.1
%/V
Load Regulation (
∆V/V)
I
L
= 0.1mA to 500mA
0.05
0.2
%
I
L
= 100
µA
10 60
80
I
L
= 50 mA
125
175
250
I
L
= 150 mA
180
350
450
Dropout Voltage
(V
IN
- V
O
)
I
L
= 500 mA
340
550
700
mV
Quiescent Current (I
GND
)
V
ENABLE
< 0.6V
V
ENABLE
< 0.25V
0.05
0.10
3
8
µA
I
L
= 100
µA
110 150
190
I
L
= 50 mA
360
650
900
I
L
= 150 mA
1.3
2.0
2.5
Ground Pin Current
(I
GND
)
I
L
= 500 mA
13.0
25.0
30.0
Ripple Rejection (PSRR)
55
dB
Current Limit (I
LIMIT
) V
OUT
= 0V
800
950
mA
Output Noise (e
NO
)
I
L
= 50mA, C
L
= 1.0
µF
(10Hz – 100KHz)
390
µV
RMS
OFF
0.6
V
Input Voltage Level
Logic Low (V
IL
)
Input Voltage Level
Logic High (V
IH
)
ON
2
V
ENABLE Input Current
V
IL
< 0.6V
V
IH
> 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. 10/30/00
SPX3819
TYPICAL APPLICATION
+
+
GND
EN
V
IN
V
OUT
BYP
(Optn.)
ENABLE may be tied directly to V
IN
SPX3819
1
2
3
4
5
Rev. 10/30/00
SPX3819
Ground Current Vs. Input Voltage
60
70
80
90
100
110
120
130
140
150
160
4
6
8
10
12
14
16
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
10
12
14
16
Vin (V)
Vout (V)
3.3V Device
IL = 100uA
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. 10/30/00
SPX3819
Ground Current Vs. Temperature
70
80
90
100
110
120
130
-40
-20
0
20
40
60
80
100
120
Temperature (Degree C)
I Gnd (uA)
3.3V Device
Vin = 4.3V
CL = 1.0uF
IL = 100uA
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
20
40
60
80
100
120
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
10
12
14
16
Vin (V)
VEN, On Threshold (V)
3.3V Device
CL =1.0uF
IL = 100uA
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. 10/30/00
SPX3819
Rev. 10/30/00
V
OUT
GND
SPX3819
Top View
EN
BYP
(Optn)
V
IN
+
+
Fig. 1
1
2
3
5
4
Hi-ON
Lo-OFF
SOT-23
SPX3819
Application Hints
The SPX3819 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 2.2
µF aluminum electrolytic capacitor covers all
general application circuits; this stability can be obtained with
a tantalum electrolytic value of 1
µF.
In general, linear regulator stability decreases with higher
output currents. In most applications the SPX3819 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 SPX3819 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 SPX3819 provides access to the internal reference. A 10
µF 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 SPX3819 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
C
BYP
. If the rapid turn-ON is necessary, omit bypass capacitor.
Figure 1 shows SPX3819 standard application circuit. The EN (enable) pin is pulled high (>2.0V) to enable the regulator. To disable
the regulator, EN < 0.6V.
The SPX3819 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 47k
Ω 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
3
4
5
SPX3819
SOT-23
V
OUT
= 1.235V x 1 + R1
Rev. 10/30/00
SPX3819
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. 10/30/00
SPX3819
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. 10/30/00
SPX3819
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. 10/30/00
SPX3819
PACKAGE DRAWING
SOT-223-3L (M3)