Rev. 10/25/00
SPX2700/01/02
700mA Low Dropout Voltage Regulators
With Shutdown
(PRELIMINARY INFORMATION)
FEATURES
APPLICATIONS
Output Current 700mA at 3.3V and 5V Battery Powered Systems
Internal Short Circuit Current Limit
Cordless Telephones
Dropout Voltage 0.5V at 700mA Output Automotive Electronics
Extremely Tight Load and Line Regulation
Portable/ Palm Top / Notebook Computers
Very Low Temperature Coefficient
Portable Consumer Equipment
Mirror Image Insertion Protection
Portable Instrumentation
Unregulated DC Input Can Withstand -20V Reverse Battery
SMPS Post-Regulator
and +60V Positive Transients
Voltage Reference
Direct Replacement For LM2937 Socket
PRODUCT DESCRIPTION
The SPX2700/01/02 are a low power positive voltage regulators. The SPX2700/01/02 offers 700mA output current with a dropout
voltage of only 0.5V and over temperature dropout is up to 1V. The quiescent current is 10mA at differential output of 5V and output
current of 700mA. A higher quiescent current can exist when the device is in dropout mode (V
IN
-V
OUT
3V).
The regulator will automatically shut down to protect both the internal circuits and the load. This device also features short circuit and
thermal overload protection.
The SPX2700/01/02 is offered in 3 and 5 pin TO-220, TO-263 and 3-pin SOT-223 packages compatible with other 5V and 3.3V
regulators, TO-263 and 3-pin SOT-223. The device is offered in standard output voltages of 5V and 3.3V as well as in adjustable
output regulator.
Top View
TO-263-3 (T)
1
SPX2700
2
3
TO-220-5 (U)
Front View
5
4
3
2
1
SPX
2701/02
Five Lead Package Pin Functions:
TO-263-5 (T)
Top View
4 5
SPX
2700/01/02
1 2 3
Front View
TO-220-3 (U)
SPX2700
1
2
3
V
IN
GND V
OUT
1) Error
2) Input
3) GND
4) Output
5) Shutdown
Adjust
Shutdown
GND
Input
Output
V
IN
V
OUT
GND
SOT-223 (M3)
Top View
SPX2700
1
3
2
V
IN
V
OUT
GND
PIN CONNECTIONS
Rev. 10/25/00
SPX2700/01/02
ABSOLUTE MAXIMUM RATINGS
Power Dissipation..........................................Internally Limited
Input Supply Voltage
Continuous ......................... +12V
Lead Temp. (Soldering, 10 Seconds) .............................. 260C
Transient................-20V to +60V
Feedback Input Voltage...................................... -1.5V to +30V
Storage Temperature Range .........................-65 to +150C
Shutdown Input Voltage..................................... -0.3V to +30V
Operating Junction Temperature Range ..... -40C to +125C
Error Comparator Output ................................... -0.3V to +30V
ESD Rating
.....................................2KV Min
ELECTRICAL CHARACTERISTICS
at V
IN
= V
O
+ 5V, I
O
= 700mA, C
O
= 10
F, unless otherwise specified. Limits in
Boldface type apply over the entire operating temperature range. All other specifications are T
A
= 25
C.
Parameter
Conditions
(Note 2)
Typ. SPX2700/01/02A
Min Max
SPX2700/01/02
Min Max
Units
3.3V Version
Output Voltage
-40
CTJ+125C
1mA
I
L
500mA
3.3
3.3
3.267
3.217
3.333
3.382
3.234
3.185
3.366
3.415
V
5V Version
Output Voltage
-40
CTJ+125C
1mA
I
L
700mA
5.0
5.0
4.950
4.880
5.050
5.120
4.900
4.870
5.100
5.130
V
All Voltage Options
Output Voltage
Temperature Coefficient
(Note1)
20
100
150
ppm/
C
Line Regulation (Note 3)
6V
V
IN
30V (Note4)
0.03
0.1
0.40
0.20
0.80
%max
Load Regulation (Note 3)
I
L
= 1 to 700
I
L
= 0.1 to 1mA
0.04
0.20
0.30
0.30
0.50
%max
Dropout Voltage (Note 5)
I
L
= 1mA
I
L
= 700mA
60
375
100
150
400
500
100
150
400
500
mV
Ground Current
I
L
= 1mA
I
L
= 700mA
100
4.5
15
20
150
180
2
2.5
14
16
20
22
150
180
2
2.5
14
16
20
22
A
mA
Current Limit
V
OUT
= 0
700
800
700
800
mA
Thermal Regulation
0.05
0.2
0.2
%/w
Output Noise, 10Hz to 100kHz
IL = 100mA
C
L
= 2.2F
C
L
= 33F
400
200
1.0
0.60
1.0
0.60
V
Vrms
Adjustable Versions Only
Reference Voltage
Over Temperature
(Note 6)
1.235 1.210
1.200
1.185
1.260
1.270
1.285
1.200
1.980
1.185
1.270
1.272
1.285
V
Feedback Pin Bias Current
20
40
60
60
80
nA
Reference Voltage Temperature
Coefficient
(Note
7)
50
ppm/
C
Feedback Pin Bias Current
Temperature Coefficient
0.1
NA/
C
Rev. 10/25/00
SPX2700/01/02
ELECTRICAL CHARACTERISTICS
at V
IN
= V
O
+ 5V, I
O
= 700mA, C
O
= 22
F, unless otherwise specified. Limits in
Boldface type apply over the entire operating temperature range. All other specifications are T
A
= 25
C
.
Parameter
Conditions Typ.
SPX2700/01/02A
Min Max
SPX2700/01/02
Min Max
Units
Error Comparator
Output Leakage Current
V
OH
= 30V
0.01
1.00
2.00
1.00
2.00
A
Output Low Voltage
VIN = 4.5V
IOL = 400A
150
250
400
250
400
mV
Upper Threshold Voltage
(Note 8)
60
40
25
40
25
mV
Lower Threshold Voltage
(Note 8)
75
95
140
95
140
mV
Hysteresis (Note
8) 15
mV
Shutdown Input
Input Logic Voltage
Low (Regulator ON)
High (Regulator OFF)
2.0
0.7
2.0
0.7 V
Shutdown Pin Input Current
VS = 2.4V
VS = 30V
30
450
50
100
600
750
90
150
800
1000
A
Regulator Output Current In
Shutdown
3
10
20
15
25
A
Note 1: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range.
Note 2: Unless otherwise specified all limits are guaranteed for T
j
= 25
C, V
IN
= 6V, I
L
= 100
A and C
L
= 1
F. Additional conditions for the 8-pin versions are
feedback tied to 5V tap and output tied to output sense (V
OUT
= 5V) and V
SHUTDOWN
0.8V.
Note 3: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are
covered under the specification for thermal regulation.
Note 4: Line regulation for the SPX2700/01/02 is tested at 150
C for I
L
= 1 mA. For I
L
= 100
A and T
J
= 125
C, line regulation is guaranteed by design to 0.2%. See
typical performance characteristics for line regulation versus temperature and load current.
Note 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value measured at 1V differential at
very low values of programmed output voltage, the minimum input supply voltage of 2V ( 2.3V over temperature) must be taken into account.
Note 6: V
REF
V
OUT
(Vin - 1V), 2.3 Vin30V, 100AI
L
250 mA, T
J
T
JMAX
.
Note 7: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at 6V input. To
express these thresholds in terms of output voltage change, multiply by the error amplifier gain = V
OUT
/V
REF
= (R1 + R2)/R2. For example, at a programmed output
voltage of 5V, the Error output is guaranteed to go low when the output drops by 95 mV x 5V/1.235 = 384 mV. Thresholds remain constant as a percent of V
OUT
as
V
OUT
is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed.
Note 8: V
SHUTDOWN
2V, V
IN
30V, V
OUT
=0, Feedback pin tied to 5V Tap.
Note 9: The junction -to-ambient thermal resistance of the TO-92 package is 180
C/ W with 0.4" leads and 160C/ W with 0.25" leads to a PC board.
The thermal resistance of the 8-Pin DIP package is 105
C/W junction-to-ambient when soldered directly to a PC board. Junction-to-ambient thermal resistance for the
SOIC (S) package is 160
C/W.
FEEDBACK
INPUT
OUTPUT
UNREGULATED DC
SHUTDOWN
GROUND
ERROR
______
5V TAP
SENSE
5V @ 700mA
MAX
TO CMOS OR
TTL
REFERENCE
ERROR DETECTION
COMPARATOR
ERROR
AMPLIFIER
1.23V
FROM
CMOS OR
TTL
+
+
+
+
+
+
60 mV
..
60k
330k
180k
..
..
..
1
F
_
_
SPX2700/01/02 Block Diagram
Rev. 10/25/00
SPX2700/01/02
APPLICATION HINTS
EXTERNAL CAPACITORS
The stability of the SPX2700/01/02 requires a 10
F or greater
capacitor between output and ground. Oscillation could occur
without this capacitor. Most types of tantalum or aluminum
electrolytic works fine here. For operations below -25
C solid
tantalum is recommended since the many aluminum types have
electrolytes that freeze at about -30
C. The ESR of about 5 or less
and resonant frequency above 500 kHz are the most important
parameters in the value of the capacitor. The capacitor value may be
increased without limit.
At lower values of output current, less output capacitance is required
for stability. For the currents below 10mA the value of the capacitor
can be reduced to 22
F and 0.15F for 1mA. More output
capacitance is needed for the 8-pin version at voltages below 5V
since it runs the error amplifier at lower gain. At worst case 22
F or
greater must be used for the condition of 750mA load at 1.23V
output.
The SPX2700/01/02, unlike other low dropout regulators will remain
stable and in regulation with no load in addition to the internal
voltage divider. This feature is especially important in applications
like CMOS RAM keep-alive. When setting the output voltage of the
SPX2700/01/02 version with external resistors, a minimum load of
5mA is recommended. If there is more than 10 inches of wire
between the input and the AC filter capacitor or if a battery is used as
the input then a 1
A tantalum or aluminum electrolytic capacitor
should be placed from the input to the ground.
ERROR DETECTION COMPARATOR OUTPUT
The Comparator produces a logic low output whenever the
SPX2700/01/02 output falls out of regulation by more than around
5%. This is around 75mV offset divided by the 1.235 reference
voltage. This trip level remains 5% below normal regardless of the
programmed output voltage of the regulator. Figure 1 shows the
timing diagram depicting the ERROR signal and the regulator output
voltage as the SPX2700/01/02 input is ramped up and down. The
ERROR signal becomes low at around 1.3V input, and goes
high around 5V input (input voltage at which Vout = 4.75 ). Since
the SPX2700/01/02's dropout voltage is load dependent, the input
voltage trip point (around 5V) will vary with the load current. The
output voltage trip point (approx. 4.75V) does not vary with load.
The error comparator has an open-collector output, which requires an
external pull-up resistor. Depending on the system requirements the
resistor may be returned to 5V output or other supply voltage. In
determining the value of this resistor, note that the output is rated to
sink 250
A, this value adds to battery drain in a low battery
condition. Suggested values range from 100K to 1M
. If the output
is unused this resistor is not required.
PROGRAMMING THE OUTPUT VOLTAGE OF
SPX2700/01/02
The SPX2700/01/02 may be programmed for any output voltage
between its 1.235V reference and its 30V maximum rating . As seen
in Figure 2, an external pair of resistors is required. Refer to the
below equation for the programming of the output voltage:
V
OUT
= V
REF
(1 + R
1
\ R
2
)+ I
FB
R
1
The V
REF
is 1.235 and I
FB
is the feedback bias current, nominally -20
nA. The minimum recommended load current of 1
A forces an
upper limit of 1.2 M
on value of R
2
. If no load is presented the I
FB
produces an error of typically 2% in V
OUT
, which may be eliminated
at room temperature by trimming R
1
. To improve the accuracy
choose the value of R
2
= 100k this reduces the error by 0.17% and
increases the resistor program current by 12
A. Since the
SPX2700/01/02 typically draws 100
A at no load with
SHUTDOWN open-circuited this is a small price to pay
REDUCING OUTPUT NOISE
It may be an advantage to reduce the AC noise present at the output.
One way is to reduce the regulator bandwidth by increasing the size
of the output capacitor. This is the only way that noise can be
reduced on the 3 lead SPX2700/01/02 but is relatively inefficient, as
increasing the capacitor from 1
F to 220F only decreases the noise
from 430
V to 160V
RMS
for a 100 kHz bandwidth at 5V output.
Noise could also be reduced fourfold by a bypass capacitor across R
1
,
since it reduces the high frequency gain from 4 to unity. Pick
C
BYPASS
1 / 2R
1
200 Hz
or choose 0.01
F. When doing this, the output capacitor must be
increased to 3.3
F to maintain stability. These changes reduce the
output noise from 430
V to 100V
RMS
for a 100 kHz bandwidth at
5V output. With the bypass capacitor added, noise no longer scales
with output voltage so that improvements are more dramatic at higher
output voltages.
+
+
+
+
4.75V
OUTPUT
VOLTAGE
ERROR*
_______
INPUT
VOLTAGE
1.3V
5.0V
Figure 1. ERROR Output Timing
_______
* See Application Info.
SPX2703
Fig.2 Adjustable Voltage Regulator
V
IN
V
OUT
GND
ADJ
SHUTDOWN
Rev. 10/25/00
SPX2700/01/02
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
0.176
0.005
(4.470
0.127)
0.050
0.002
(1.270
0.051)
0.015 +- 0.003
0 8
(0.381
0.074)
+-
0.100
0.010
(2.540
0.254)
Rev. 10/25/00
SPX2700/01/02
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. 10/25/00
SPX2700/01/02
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.
Rev. 10/25/00
SPX2700/01/02
TO-220-5L (U)
0.108 +- 0.005
(2.74 +- 2.74)
0.400 +-0.005
(10.16+- 0.13)
0.150 D+-0.005
(3.81D +-0.13)
0.175 +- 0.005
(4.45 +- 0.13)
0.050 +- 0.005
(1.27 +- 0.13)
0.250 +- 0.005
(6.35 +- 0.13)
0.590 +- 0.005
(14.99 +- 0.13)
SEATING
PLANE
0.547 +- 0.005
(13.89 +- 0.005)
0.067 +- 0.005
(1.70 +- 0.127)
0.268 REF
(6.81 REF)
0.268 REF
0.032 +- 0.005
(0.81 +- 0.13)
0.015 +- 0.005
(0.38 +- 0.13)
0.105 +- 0.005
(2.67 +- 0.13)
1.137 REF
(28.88 REF)
7
Typ.
Rev. 10/25/00
SPX2700/01/02
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
0.146
0.130
10
C Max
0.014
0.010
10
C
16
C
10
C
16
C
16
C
Rev. 10/25/00
SPX2700/01/02
ORDERING INFORMATION
Ordering No.
Precision Output Voltage
Packages
SPX2700M3-3.3
2%
3.3V
3 Lead TO-223
SPX2700M3-5.0
2%
5.0V
3 Lead TO-223
SPX2700AM3-3.3
1%
3.3V
3 Lead TO-223
SPX2700AM3-5.0
1%
5.0V
3 Lead TO-223
SPX2700T3-3.3
2%
3.3V
3 Lead TO-263
SPX2700T3-5.0
2%
5.0V
3 Lead TO-263
SPX2700AT3-3.3
1%
3.3V
3 Lead TO-263
SPX2700AT3-5.0
1%
5.0V
3 Lead TO-263
SPX2700T5-3.3
2%
3.3V
5 Lead TO-263
SPX2700T5-5.0
2%
5.0V
5 Lead TO-263
SPX2700AT5-3.3
1%
3.3V
5 Lead TO-263
SPX2700AT5-5.0
1%
5.0V
5 Lead TO-263
SPX2700U3-3.3
2%
3.3V
3 Lead TO-220
SPX2700U3-5.0
2%
5.0V
3 Lead TO-220
SPX2700AU3-3.3
1%
3.3V
3 Lead TO-220
SPX2700AU3-5.0
1%
5.0V
3 Lead TO-220
SPX2700U5-3.3
2%
3.3V
5 Lead TO-220
SPX2700U5-5.0
2%
5.0V
5 Lead TO-220
SPX2700AU5-3.3
1%
3.3V
5 Lead TO-220
SPX2700AU5-5.0
1%
5.0V
5 Lead TO-220
SPX2701T3-3.3
2%
3.3V
3 Lead TO-263
SPX2701T3-5.0
2%
5.0V
3 Lead TO-263
SPX2701AT3-3.3
1%
3.3V
3 Lead TO-263
SPX2701AT3-5.0
1%
5.0V
3 Lead TO-263
SPX2701T5-3.3
2%
3.3V
5 Lead TO-263
SPX2701T5-5.0
2%
5.0V
5 Lead TO-263
SPX2701AT5-3.3
1%
3.3V
5 Lead TO-263
SPX2701AT5-5.0
1%
5.0V
5 Lead TO-263
SPX2701U3-3.3
2%
3.3V
3 Lead TO-220
SPX2701U3-5.0
2%
5.0V
3 Lead TO-220
SPX2701AU3-3.3
1%
3.3V
3 Lead TO-220
SPX2701AU3-5.0
1%
5.0V
3 Lead TO-220
SPX2701U5-3.3
2%
3.3V
5 Lead TO-220
SPX2701U5-5.0
2%
5.0V
5 Lead TO-220
SPX2701AU5-3.3
1%
3.0V
5 Lead TO-220
SPX2701AU5-5.0
1%
5.0V
5 Lead TO-220
SPX2702T3
2%
Adj
3 Lead TO-263
SPX2702AT3
1%
Adj
3 Lead TO-263
SPX2702T5
2%
Adj
5 Lead TO-263
SPX2702AT5
1%
Adj
5 Lead TO-263
SPX2702U3
2%
Adj
3 Lead TO-220
SPX2702AU3
1%
Adj
3 Lead TO-220
SPX2702U5
2%
Adj
5 Lead TO-220
SPX2702AU5
1%
Adj
5 Lead TO-220
Rev. 10/25/00
SPX2700/01/02
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation
Headquarters and Main Offices:
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: sales@sipex.com
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 935-7600
FAX: (408) 934-7500
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described
hereing; neither does it convey any license under its patent rights nor the rights of others.
Corporation
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