Rev. 10/24/00
SPX5205
150 mA, Low-Noise LDO Voltage Regulator
(Preliminary Information)
FEATURES APPLICATIONS
Low Noise Output LDO
PDA
1% Initial Accuracy At 150mA
Battery Powered Systems
Very Low Quiescent Current
Cellular Phone
Low Dropout Voltage (210mV At 150mA)
Cordless Telephones
Current & Thermal Limiting
Radio Control Systems
Reverse-Battery Protection
Portable/Palm Top/Notebook Computers
Wide Range of Fix Output Voltages
Portable Consumer Equipment
1.8V, 2.5V, 2.8V, 3.0V, 3.3V, 4.0V, 4.5V, & 5.0V
Portable Instrumentation
Zero Off-Mode Current
Bar Code Scanners
Small 5-Pin SOT-23
Pin Compatible to MIC5205/MAX8877 (Fixed Option Only)
SMPS Post-Regulator
PRODUCT DESCRIPTION
The SPX5205 is an excellent choice for use in battery-powered applications, and where power conservation is desired. Such as:
cellular/ cordless telephones, radio control systems, and portable computers.
This device is a positive voltage regulator with very low dropout voltage and low output noise. It uses very little quiescent current of
750
A at 100 mA output load. V
OUT
tolerance is less than 1% with a compensated temperature coefficient. Many fixed output
voltages, as listed below, or an adjustable version are available in a small 5-pin SOT-23 package.
Other key features include: Zero off-mode current, protection against reversed battery, thermal and current limiting.
MARKING INFORMATION
Voltage Marking Voltage Marking
1.8 R1XX 4.0 R7XX
2.5 R2XX 4.5 R8XX
2.8 R3XX
3.0 R5XX 5.0 RBXX
3.3 R6XX ADJ RCXX
PIN CONNECTIONS
3
2
1
Fixed Output Voltage
SPX5205
5
4
3
2
1
Top View
SPX5205
5
4
BYP
V
OUT
ADJ/BYP
V
OUT
EN
EN
GND
GND
V
IN
V
IN
Top View
Adjustable Output Voltage
SPX5205
Rev. 10/24/00
SPX5205
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
Thermal Shutdown .................................... Internally Limited
Input Voltage................................................. +2.5V to +16V
Lead Temp. (Soldering, 5 Seconds) ............................ 260
C
Operating Junction Temperature Range ..... -40
C to +125C
Operating Junction Temperature Range ..... -40
C to +125C
Enable Input Voltage............................................. 0V to V
IN
Input Supply Voltage........................................-20V to +20V
SOT-23-5 (
JA
) ..................................................... See Note 1
Enable Input Voltage........................................-20V to +20V
ELECTRICAL CHARACTERISTICS
T
J
= 25
C, V
IN
= V
OUT
+ 1V, I
L
= 100
A, C
L
= 1
F, 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 (V
OUT
)
I
L
= 100
A
I
L
= 500
A
-1
-2
+1
+2
%V
NOM
Output Voltage Temperature Coefficient
57
ppm/
C
Line Regulation
V
IN
= V
OUT
+ 1V to 16V
V
IN
= V
OUT
+ 1V to 16V
0.03
0.1
0.2
%/V
Load Regulation
I
L
= 0.1mA to 150mA
I
L
= 0.1mA to 150mA
0.1
0.2
0.5
%
I
L
= 100
A
30
50
70
I
L
= 50 mA
140
190
230
I
L
= 100 mA
180
250
300
Dropout Voltage (See Note 2)
(V
IN
- V
O
)
I
L
= 150 mA
210
275
350
mV
Quiescent Current (I
GND
)
V
ENABLE
< 0.6V
V
ENABLE
< 0.25V
< 1
1
5
A
I
L
= 100
A
80
125
150
I
L
= 50 mA
350
600
800
I
L
= 100 mA
750
1000
1500
Ground Pin Current
(I
GND
)
I
L
= 150 mA
1300
1900
2500
A
Ripple Rejection (PSRR)
55
dB
Current Limit (I
LIMIT
) V
OUT
= 0V
360
500
mA
Output Noise (e
NO
)
I
L
= 50mA, C
L
= 1
F
10Hz 100Khz.)
390
V
RMS
Input Voltage Level
Logic Low (V
IL
) OFF
0.6
V
Input Voltage Level
Logic High (V
IL
) ON
2.0
ENABLE Input Current
V
IL
< 0.6V
V
IH
> 2.0V
0.01
2
2
20
A
Note 1: The maximum allowable power dissipation is a function of maximum operating junction temperature, T
J (max)
,
the junction to ambient thermal resistance, and
the ambient,
JA
, and the ambient temperature T
A
. The maximum allowable power dissipation at any ambient temperature is given:
P
D (max)
= (T
J (max)
- T
A
)/
JA,
exceeding the maximum allowable power limit will result in excessive die temperature; thus, the regulator will go into thermal shutdown.
The
JA
of the SPX5205 is 220
o
C/W mounted on a PC board.
Note 2: Not apply to 1.8V version.
Rev. 10/24/00
SPX5205
TYPICAL APPLICATION
+
+
GND
EN
V
IN
SPX5205
1.0uF
3
2
1
4
5
V
OUT
ENABLE
may be tied directly to V
IN
BYP
(Optn)
Rev. 10/24/00
V
OUT
GND
SPX5205
Top View
EN
BYP
(Optn)
V
IN
+
+
Fig. 1
1
2
3
5
4
Hi-ON
Lo-OFF
SPX5205
Application Hints
The SPX5205 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
F aluminum electrolytic capacitor covers all
general application circuits; this stability can be obtained with
a tantalum electrolytic value of 1
F.
In general, linear regulator stability decreases with higher
output currents. In most applications the SPX5205 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 SPX5205 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 SPX5205 provides access to the internal reference. A 10
F capacitor on the 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 SPX5205 start-up speed is inversely
proportional to the size of this 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 SPX5205 standard application circuit. The EN pin is pulled high (>2.0V) to enable the regulator. To disable the
regulator, EN < 0.6V.
The SPX5205 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
or less. A capacitor
from ADJ to ground will provide improved noise performance.
V
IN
V
OUT
GND
Top View
EN
Byp
(Optn)
+
+
ADJ
R1
R2
Fig. 2
Hi-ON
Lo-OFF
1
2
3
4
5
SPX5205
R1
R2
V
OUT
= 1.235 x 1+
Rev. 10/24/00
SPX5205
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
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