SPX2954AS-5-0 [SIPEX]
250mA Low Dropout Voltage Regulator; 250毫安低压差稳压器
| 型号： | SPX2954AS-5-0 |
| 厂家： | 
SIPEX CORPORATION |
| 描述： | 250mA Low Dropout Voltage Regulator |
| 文件： | 总17页 (文件大小：214K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
SPX2954
250mA Low DropoutVoltage Regulator
FEATURES
+VIN
■ 5.0V and 3.3V Versions at 250mA
Output
100K
8
■ Accurate 0.5% for SPX2954A
■ Very Low Quiescent Current
+VIN
______
ERROR
ERROR
5
1.2 to 30V
1
OUTPUT
VOUT
■ Low Dropout: 310mV at 250mA
■ Extremely Tight Load and Line Regulation
■ Very Low Temperature Coefficient
■ Current and Thermal Limiting
■ Need only 1µF for Stability
SPX2954
+
SHUTDOWN
INPUT
3
R1
3.3µF
SD
.01µF
FB
7
GND
4
1.23V
VREF
■ Direct Replacement for LP2954
R2
■ Offered in TO-92, TO-263, SOT-223, &
TO-220; also SOIC--8 Pin Versions Only
■ Error Flag Warns of Output Dropout
■ Logic-Controlled Electronic Shutdown
■ Programmable Output from 1.24V to 30V
DESCRIPTION
The SPX2954 and SPX2954A are low power voltage regulators. These devices are an excellent
choice for use in battery-powered applications such as cordless telephones, radio control
systems, and portable computers. The SPX2954 and SPX2954A feature low quiescent current
and low dropout voltage (typ. 20mV at 100µA and 310mV at 250mA). This includes a tight initial
tolerance (0.5% for SPX2954A), extremely good load and line regulation (0.05% typ.), and very
low output temperature coefficient (20 ppm/°C typ.), making the SPX2954/SPX2954A useful as
a low-power voltage reference.
The error flag output feature is used as a power-on reset for warning of a low output voltage, due
to a falling input voltage. The logic-compatible shutdown feature enables the regulator to be
switched ON and OFF. The SPX2954/SPX2954A is offered in 3-pin TO-92, TO-263, SOT-223
and TO-220 packages, and 8 pin SOIC package.
Note:: Tab is internally connected to GND on T0-263, SOT-223, and TO-220-3.
8-Pin Surface Mount (S)
TO-263-3 Package (T)
TO-92 (N)
SOT-223 Package (M3)
TO-220-3 Package (U)
INPUT
OUTPUT
SENSE
1
2
3
8
7
6
5
1
2
3
FEEDBACK
5V, 3.3V TAP
ERROR
SPX2954
SPX2954
SPX2954
SPX2954
1
2
3
SHUTDOWN
1
2
3
INPUT
OUTPUT
4
GND
GND
GND
V
OUT
V
IN
Bottom View
Front View
Top View
VIN
GND VOUT
Top View
1
2
3
VIN
V
GND
OUT
Front View
Pin Connections
Date: 12/9/05
SPX2954, 250mA Low Dropout Voltage Regulator
© Copyright 2005 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
Power Dissipation........................................Internally Limited
Lead Temperature (soldering, 5 seconds) ................260°C
Storage Temperature Range........................-65°C to +150°C
Operating Junction Temperature Range......-40°C to +125°C
Input Supply Voltage...........................................-0.3V to +30V
Feedback Input Voltage....................................-1.5V to +30V
Shutdown Input Voltage .................................-0.3V to +30V
Error Comparator Output...................................-0.3V to +30V
ESD Rating................................................................2kV Min
ELECTRICAL CHARACTERISTICS VIN =VO + 1V, IL=100µA, CL=1µF (NOTE 2), TA = 25°C, unless otherwise specified.
SPX2954A
SPX2954
PARAMETER
3.3 V Versions
Output Voltage
CONDITIONS
MIN. TYP. MAX
MIN. TYP. MAX.
UNIT
TJ=25°C
-25°C≤TJ≤85°C
Full Operating Temp.
3.284
3.267
3.260
3.3
3.3
3.3
3.317
3.333
3.340
3.267 3.3 3.333
3.251 3.3 3.350
3.234 3.3 3.366
V
Output Voltage
100µA ≤IL ≤250 mA
TJ ≤TJMAX
3.251
3.3
3.350
3.201 3.3 3.399
V
5 V Versions
Output Voltage
TJ = 25°C
-25°C ≤TJ ≤85°C
Full Operating Temp.
4.975
4.950
4.940
5.0
5.0
5.0
5.025
5.050
5.060
4.950 5.0 5.050
4.925 5.0 5.075
4.900 5.0 5.100
V
V
Output Voltage
100µA ≤IL ≤250 mA
TJ ≤TJMAX
4.925
5.0
5.075
4.850 5.0 5.150
All Voltage Options
Output Voltage
Temperature Coefficient
(NOTE 1)
20
100
0.10
0.20
50
150
ppm/°C
Line Regulation (NOTE 3) VO+1V≤VIN≤30V |
0.03
0.04
0.04 0.20
0.10 0.30
%
(NOTE 4)
Load Regulation (NOTE 3) 100 µA≤IL≤250 mA
%
Dropout Voltage
(NOTE 5)
IL = 1mA
IL = 100 mA
IL = 250 mA
60
290
310
100
450
500
60
100
mV
290 450
310 500
Ground Current
IL = 1mA
IL = 100 mA
IL = 250 mA
150
3
10
170
6
14
150 170
µA
mA
mA
3
6
14
10
Current Limit
VOUT = 0
270
0.05
430
160
100
550
0.2
270 550
0.05 0.2
430
mA
Thermal Regulation
Output Noise,
%/W
CL = 1µF
µV rms
µV rms
µV rms
10Hz to 100kHz
CL = 200 µF
160
CL = 3.3 µF, Bypass=
0.01µF from Pin 7 to
Pin 1 (8 pin Versions)
100
8-Pin Versions only
Reference Voltage
Reference Voltage
1.220
1.190
1.235 1.250
1.270
1.210 1.235 1.260
V
V
Over Temp (NOTE 6)
1.185
1.285
60
Feedback Pin
Bias Current
40
60
40
50
nA
Vref Temperature
Coefficient
20
ppm/°C
nA/°C
Feedback IBIAS
0.1
0.1
Temperature Coefficient
Date: 12/9/05
SPX2954, 250mA Low Dropout Voltage Regulator
© Copyright 2005 Sipex Corporation
2
ELECTRICAL CHARACTERISTICS (Cont.) VIN=VO+1V, IL=100µA, CL=1µF (NOTE 2), TA = 25°C, unless otherwise specified.
SPX2954A
SPX2954
PARAMETER
CONDITIONS
MIN. TYP. MAX
MIN. TYP. MAX.
UNIT
Error Comparator
Output Leakage Current VOH = 30V
Output Low Voltage VIN = VO-0.5V,
IOL = 400µA
0.01
1
0.01
1
µA
150
60
250
150 250
60
mV
mV
mV
mV
Upper Threshold Voltage (NOTE 7)
Lower Threshold Voltage (NOTE 7)
40
40
75
95
75
15
95
Hysteresis
(NOTE 7)
15
Shutdown
Input logic Voltage
Low (Regulator ON)
High (Regulator OFF)
1.3
0.7
1.3
30
0.7
50
V
2.0
2.0
Shutdown Input Current VS = 2.4V
VS= 30V
30
400
50
800
µA
µA
400 800
Regulator Output Current (NOTE 8)
in Shutdown
3
10
3
10
Thermal Resistance ΘJA
TO-263-3
31.4
128.4
131.9
62.3
°C/W
°C/W
°C/W
°C/W
°C/W
SOIC-8
TO-92-3
SOT-223
TO-220-3
29.4
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 guaranteed for TJ = 25°C, V = 6V, I = 100µA and C = 1µF.
Additional conditions for the 8-pin versions are feedback tied toI5NV tap aLnd output tied toLoutput sense
(V
= 5V) and VSHUTDOWN ≤ 0.8V.
NOTE 3: ReOgUuTlation 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 SPX2954 is tested at I = 1mA.
NOTE 5: Dropout voltage is defined as the input to outpL ut differential at which the output voltage drops 100mV
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: VREF ≤VOUT ≤ (VIN - 1V), 2.3 ≤VIN≤30V, 100µA≤IL≤ 250mA, TJ ≤ TJMAX
.
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 = VOUT/VREF = (R + R2)/R2. For example, at a
programmed output voltage of 5V, the error output is guaranteed to1go low when the output drops by 95
mV x 5V/1.235 = 384 mV. Thresholds remain constant as a percent of V
dropout warning occurring at typically 5% below nominal, 7.5% guaranteOeUdT.
NOTE 8: VSHUTDOWN ≥ 2V, VIN ≤ 30V, VOUT =0, Feedback pin tied to 5V/3.3V Tap.
as VOUT is varied, with the
Date: 12/9/05
SPX2954, 250mA Low Dropout Voltage Regulator
© Copyright 2005 Sipex Corporation
3
UNREGULATED DC
5V
1
7
8
+
INPUT
FEEDBACK
OUTPUT
2
SENSE
180kΩ
+
_
6
ERROR
FROM
CMOS OR
TTL
3
SHUTDOWN
AMPLIFIER
330kΩ
5V TAP
+
60 mV
60kΩ
1µF
.
5
______
ERROR
+
+
_
.
ERROR DETECTION
COMPARATOR
TO CMOS OR
TTL
1.23V
+
4
REFERENCE
GROUND
SPX2954 Block Diagram, 8 Lead 5V Version
TYPICAL PERFORMANCE CHARACTERISTICS
1.8
1.6
5
4
3.5
3.0
IL = 100mA
CL = 1µF
2.5
2.0
1.5
1.0
2
1.4
1.2
CL = 220µF
0
CL = 3.3µF
CBYP = 0.1µF
-2
1
~
~
1.0
0.8
0.6
1.25W
30
0.5
0.0
0
-1
0
10
20
40
50
10 2
10 3
10 4
=0.1uF
10 5
-75 -50 -25
0
25 50 75 100 125 150
TIME (µs)
TEMPERATURE (ºC)
FREQUENCY (Hz), CBYP
Shutdown Threshold Voltage
Thermal Response
Output Noise
80
70
60
50
40
30
20
10
30
25
20
15
IL=50mA
IL = 100µA
TJ = 150 ºC
IL = 100mA
10
5
IL = 1mA
0
~
~
CL = 1µF
VIN = 6V
VOUT = 5V
10
5
TJ = 125 ºC
IL = 100µA
0
-5
-10
10 1
10 2
10 3
FREQUENCY (Hz)
10 4
10 5
10 6
5
10
15
20
25
30
INPUT VOLTAGE (V)
Line Regulation
Ripple Rejection
Date: 12/9/05
SPX2954, 250mA Low Dropout Voltage Regulator
© Copyright 2005 Sipex Corporation
4
TYPICAL PERFORMANCE CHARACTERISTICS
10
6
250
225
200
5
4
RL = 50kΩ
175
150
1
=50kΩ
RL
3
2
125
RL=50kΩ
RL
=
100
75
0.1
50
25
0
1
0
0.01
0
1
2
3
4
5
6
7
8
9
10
0.1
1
10
100
0
1
2
3
4
5
6
INPUT VOLTAGE (VOLTS)
LOAD CURRENT (mA)
INPUT VOLTAGE (VOLTS)
Input Current
Quiescent Current
Dropout Characteristics
6
320
280
160
150
140
130
120
110
100
90
RL=50
Ω
240
200
160
VOUT = 5V
5
IL= 1mA
IL= 0
VIN = 6V
IL = 100mA
80
70
120
80
60
50
40
30
20
10
0
4
3
40
0
0
1
2
3
4
5
6
7
8
-75
-25
0
25 50 75 100 125 150
-50
0
1
2
3
4
5
6
7
8
9 10
INPUT VOLTAGE (VOLTS)
TEMPERATURE (ºC)
INPUT VOLTAGE (VOLTS)
Ground Current
Ground Current
Input Current
190
170
150
130
8
7
6
5
4
IL=100mA
VIN =6V
IL =100uA
3
2
1
0
-75 -50 -25
0
25 50 75 100 125 150
0
1
2
3
4
5
6
7
8
TEMPERATURE (ºC)
INPUT VOLTAGE
Ground Current
Quiescent Current
Date: 12/9/05
SPX2954, 250mA Low Dropout Voltage Regulator
© Copyright 2005 Sipex Corporation
5
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
500
240
230
500
IL = 150mA
400
300
400
300
220
210
200
190
180
200
~
200
~
40
20
0
TJ = 25ºC
100
0
IL = 100µA
170
100µA
1mA
OUTPUT CURRENT
10mA
100mA
-75 -50 -25
0
25 50 75 100 125 150
-75 -50 -25
0
25 50 75 100 125 150
TEMPERATURE (ºC)
TEMPERATURE (ºC)
Drop-Out Voltage
Drop-Out Voltage
Short Circuit Current
8
6
4
2.5
2.0
100
mV
VOUT = 5V
TA = 125ºC
50
mV
0
1.5
1.0
TA = 25ºC
TA = -55ºC
CL = 1µF
IL = 1mA
VOUT = 5V
HYSTERESIS
-50
mV
~
2
0
~
8V
0.5
0.0
6V
4V
PULLUP RESISTOR TO
SEPARATE 5V SUPPLY
-2
0
1
2
3
4
5
0
200
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
400
600
800
INPUT VOLTAGE (V)
OUTPUT LOW VOLTAGE (V)
TIME(µs)
Error Comparator Output
Comparator Sink Current
Line Transient Response
10
90
80
70
60
50
40
90
80
IO = 100µA
5
CL= 1µF
IO = 1mA
2
VIN = 6V
VOUT = 5V
70
60
50
40
30
20
IL = 1mA
IL = 0
IO = 100mA
1
0.5
0.2
VOUT = 5V
CL = 1µF
0.1
0.05
IL = 100µA
CL = 1µF
VIN = 6V
VOUT = 5V
30
20
0.02
0.01
IL = 10mA
10 4
103
10 1
10 2
10 5
106
10 1
10 2
10 3 10 4
FREQUENCY (Hz)
10 5
10 6
10
100
1K
FREQUENCY (Hz)
10K
100K
1M
FREQUENCY (Hz)
Output Impedance
Ripple Rejection
Ripple Rejection
Date: 12/9/05
SPX2954, 250mA Low Dropout Voltage Regulator
© Copyright 2005 Sipex Corporation
6
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
20
50
0
2.3
PIN 7 DRIVEN BY EXTERNAL
SOURCE (REGULATOR RUN
OPEN LOOP)
10
-50
2.1
0
TA=1 25ºC
-100
-150
-200
-250
-10
TA = 25ºC
TA = 55ºC
1.9
-20
-30
1.7
-75 -50 -25
-75 -50 -25
0
25 50 75 100 125 150
-2.0
-1.5 -1.0 -0.5
0
0.5
1.0
0
25 50 75 100 125 150
TEMPEATURE (ºC)
FEEDBACK VOLTAGE (V)
TEMPERATURE
Minimum Operating Voltage
Feedback Bias Current
Feedback Pin Current
250
200
150
80
60
40
7
CL = 1µF
6
5
4
100
50
0
20
0
3
2
1
-20
-40
-60
IL = 10mA
VIN = 8V
CL = 10µF
VOUT = 5V
-50
CL = 1µF
VOUT = 5V
-100
CL = 10µF
V OUT = 5V
~
0
~
~
~
100
mA
2
0
100
µA
100
100
µA
µA
-2
0
1
2
3
4
5
-100
0
100 200 300 400 500 600 700
0
4
8
12
16
20
TIME (ms)
TIME (us)
TIME (ms)
Load Transient Response
Load Transient Response
Enable Transient
120
400
300
200
120
8-PIN
MOLDED
TO-92 PACKAGE
0.25" LEADS SOLDERED
TO PC BOARD
DIP SOLDERED
TO PC BOARD
TJMAX = 125º C
100
80
100
80
VOUT = 5V
Vout=5V
TJMAX = 125 ºC
60
60
TA = 25ºC
40
TA=25 ºC
40
20
0
TA = 50ºC
100
0
TA = 85 ºC
20
0
TA = 85ºC
0
5
10
15
20
25
30
-75 -50 -25
0
25 50 75 100 125 150
0
5
10
15
20
25
30
INPUT VOLTAGE (V)
TEMPERATURE (ºC)
INPUT VOLTAGE (V)
Maxium Rated Output
Divider Resistance
Maxium Rated Output Current
Date: 12/9/05
SPX2954, 250mA Low Dropout Voltage Regulator
© Copyright 2005 Sipex Corporation
7
APPLICATIONS HINTS
EXTERNAL CAPACITORS
ERROR DETECTION COMPARATOR
OUTPUT
The stability of the SPX2954 requires a 1µF or
greater capacitor between output and ground.
Oscillation could occur without this capacitor.
Most types of tantalum or aluminum electro-
lytic 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 5Ω or
less and resonant frequency above 500kHz are
the most important parameters in the value of
the capacitor. The capacitors value may be in-
creased without limit.
The comparator produces a logic low output
whenever the SPX2954 output falls out of regu-
lation by more than around 5%. This is around
60 mV offset divided by the 1.235 reference
voltage. This trip level remains 5% below nor-
mal regardless of the programmed output volt-
age of the regulator.
Figure1showsthetimingdiagramdepictingthe
ERROR signal and the regulator output voltage
as the SPX2954 input is ramped up and down.
TheERRORsignalbecomeslowataround1.3V
input, and goes high around 5V input (input
voltage at which VOUT = 4.75). Since the
SPX2954’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.
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 0.33µF and 0.1µF 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 3.3
µF or greater must be used for the condition of
150mA load at 1.23V output.
The error comparator has an open-collector out-
put, which requires an external pull-up resistor.
Depending on the system requirements the re-
sistor 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
400mA, this value adds to battery drain in a low
battery condition. Suggested values range from
100k to 1MΩ. If the output is unused this resis-
tor is not required.
The SPX2954 unlike other low dropout regula-
tors will remain stable and in regulation with no
load in addition to the internal voltage divider.
This feature is especially important in applica-
tions like CMOS RAM keep-alive. When set-
ting the output voltage of the SPX2954 version
with external resistors, a minimum load of 1µA
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 1µF tantalum
or aluminum electrolytic capacitor should be
placed from the input to the ground.
PROGRAMMING
VOLTAGE OF SPX2954
THE
OUTPUT
The SPX2954 may be pin-strapped for 5V using
its internal voltage divider by tying Pin 1 (out-
put) to Pin 2 (sense) and Pin 7 (feedback) to Pin
6 (5V Tap). Also, it may be programmed for any
output voltage between its 1.235V reference
and its 30V maximum rating using an external
pair of resistors. Refer to the below equation for
the programming of the output voltage:
Instability can occur if there is stray capacitance
to the SPX2954 feedback terminal (pin 7). This
could cause more problems when using a higher
value of external resistors to set the output
voltage. This problem can be fixed by adding a
100pF capacitor between output and feedback
and increasing the output capacitor to at least
3.3µF.
VOUT = VREF x (1 + R1/R2)+ IFBR1
The VREF is 1.235 and IFB is the feedback bias
current, nominally -20nA. The minimum
recommended load current of 1 µA forces an
Date: 12/9/05
SPX2954, 250mA Low Dropout Voltage Regulator
© Copyright 2005 Sipex Corporation
8
APPLICATIONS HINTS (CONT)
+V IN
upper limit of 1.2MΩ on value of R . If no load
is presented the IFB produces an error2of typically
2% in VOUT which may be eliminated at room
temperature by trimming R1. To improve the
accuracy choose the value of R = 100k this
reduces the error by 0.17% and2increases the
resistor program current by 12µA. Since the
SPX2954 typically draws 60µA at no load with
Pin 2 open-circuited, this is a small price to pay.
470KΩ
8
+V IN
______
ERROR
5
VOUT
1
470kΩ
VOUT
SPX2954
+
3
R1
1µF
SD
FB
7
GND
4
RESET
R2
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 SPX2954 but is
relatively inefficient, as increasing the capacitor
from 1µF to 220 µF only decreases the noise
from 430µV to 160µVRMS for a 100kHz band-
width at 5V output. Noise can be reduced four-
fold by using a bypass capacitor across R1, since
it reduces the high frequency gain from 4 to
unity. Pick
Figure 2. Latch Off when Error Flag Occurs
+V IN
8
+V IN
______
ERROR
ERROR
5
*V OUT = V IN
1
OUTPUT
VOUT
SPX2954
3
SHUTDOWN
INPUT
SD
FB
GND
C
BYPASS ≅ (1 / 2πR1 x 200 Hz)
7
4
or choose 0.01µF. When doing this, the output
capacitor must be increased to 3.3µF to maintain
stability. These changes reduce the output noise
from 430µV to 100µVRMS for a 100kHz band-
width at 5V output. With the bypass capacitor
added, noise no longer scales with output volt-
age so that improvements are more dramatic at
higher output voltages.
*MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40mV to 400mV.
DEPENDING ON LOAD CURRENT.
Figure 3. Wide Imput Voltage Range, Current Limiter
4.75V
OUTPUT
VOLTAGE
_______
ERROR*
+
5.0V
+
INPUT
VOLTAGE
+
1.3V
+
* See Application Info.
Figure 1. Error Output Timing
Date: 12/9/05
SPX2954, 250mA Low Dropout Voltage Regulator
© Copyright 2005 Sipex Corporation
9
APPLICATIONS HINTS
+
6V
SEALED
1.5kΩ
120kΩ
LEAD-
8
ACID
1N457
BATTERY
SOURCE
+VIN
FB
1
2
MAIN V+
SPX385
OUT
V
SPX2954
MEMORY V+
SENSE
400kΩ
+
FOR 5.5 V
3
20kΩ
1µF
SD
100kΩ
GND
4
NI-CAD
BACKUP
BATTERY
Figure 4. Low Battery Disconnect
8
2
39kΩ
SENSE
VOUT
+VIN
______
+VOUT = 5V
5
3
1
7
ERROR
RESET
+
1uF
SPX2954
-
C4
+
SD
FB
39kΩ
GND
4
TAP
6
1% 100kΩ
-
100kΩ
C1
C2
+
6V
LEAD-
ACID
BATTERY
1kΩ
1%
<5.8V**
<6.0V**
<6.2V**
-
100kΩ
+
100kΩ
-
1%
1kΩ
C3
+
10kΩ
R3
*
*
OPTIONAL LATCH OFF WHEN DROPOUT OCCURS. ADJUSTR3 FOR C2 SWITCHING WHEN
IS 6.0V
OUTPUTS GO LOW WHEN V IN DROPS BELOW DESGNATED THRESHHOLDS
V
IN
1%
20kΩ
Figure 5. Regulator with State of Charge Indicator
Date: 12/9/05
SPX2954, 250mA Low Dropout Voltage Regulator
© Copyright 2005 Sipex Corporation
10
APPLICATIONS HINTS
+V IN
8
10K
Ω
.
+V IN
_______
ERROR
5
1
5 DEGREE SHUTDOWN FLAG
3
AUX SHUTDOW
INPUT
.
SD
OFF
SPX2954
ON
V
7
OUT
GND
FB
EXTERNAL CIRCUIT
PROTECTED FROM
4
OR
+
OVER TEMPERATURE
(V+ GOES OFF WHEN
TEMP > 125)
TEMP
SENSOR
AS35
RELAY
-
8.2K
Ω
Figure 6. System Over Temperature Protection
+5V
4.7mA
UNREGULATED INPUT
4
20mA
8
OUTPUT
8
+V IN
330kΩ
IN
1
2N5432
(2)
VOUT
1
V OUT
27kΩ
1N4001
SPX2954
SPX2954
7
2
5V
6
0.1µF
FB
2
SENSE
VTAP
OUTPUT
FB
7
GND
4
+
GND
4
4.7µF
LOAD
50mA
360K
Ω
TO
300 mA
1N457
MIN VOLTAGE = 4V
Figure 7. Open Circuit Detector for 4mA to 20mA
Current Loop
Figure 8. 300mA Regulator with 0.75V
Date: 12/9/05
SPX2954, 250mA Low Dropout Voltage Regulator
© Copyright 2005 Sipex Corporation
11
PACKAGE: 3 PIN TO-263
E
Seating
Plane
A
E/2
C2
L1
SIDE VIEW
H
D
Chamfer
Optional
1
2
3
c
e
See Detail C
b
b2
Gauge Plane
Seating
Plane
FRONT VIEW
θ
L3
A1
L
DETAIL C
Thermal
Pad
3 Pin TO-263 JEDEC TO-263
Variation AA
Millimeters
Conversion Factor:
1 Inch = 25.40 mm
(L1)
Inches
Controlling Dimension
SYMBOL
MIN
NOM
-
-
-
-
-
-
-
MAX
0.190
0.010
0.039
0.070
0.029
0.065
0.380
-
MIN
4.06
0.00
0.51
1.14
0.38
1.14
8.38
6.86
9.65
6.22
NOM
-
-
-
-
-
-
-
MAX
D1
A
A1
b
b2
c
c2
D
D1
E
0.160
0.000
0.020
0.045
0.015
0.045
0.330
0.270
0.380
0.245
4.83
0.25
0.99
1.78
0.74
1.65
9.65
-
-
-
-
-
-
-
0.420
-
10.67
-
E1
e
.100 BSC
2.54 BSC
H
L
L1
L3
O
0.575
0.070
-
-
-
-
0.625
0.110
0.066
14.61
1.78
-
-
-
-
15.88
2.79
1.68
BACK
VIEW
.010 BSC
-
0.25 BSC
-
0˚
8˚
0˚
8˚
E1
SIPEX Pkg Signoff Date/Rev:
JL Aug5-05 / Rev A
Date: 12/9/05
SPX2954, 250mA Low Dropout Voltage Regulator
© Copyright 2005 Sipex Corporation
12
PACKAGE: 3 PIN TO-92
L
e1
e
W
D
A
b
S1
R
E
a(2x)
3 Pin TO-92
Dimensions in Millimeters
Conversion Factor:
1 Inch = 25.40 mm
Dimensions in Inches:
Controlling Dimension
SYMBOL
MIN
0.170
0.014
0.130
0.095
0.045
0.500
0.085
0.045
0.016
0.175
4º
NOM
MAX
0.195
0.020
0.155
0.105
0.055
0.610
0.095
0.060
0.022
0.195
6º
MIN
4.32
0.36
3.30
2.41
1.14
12.70
2.16
1.14
0.41
4.45
4º
NOM
MAX
4.95
0.51
3.94
2.67
1.40
15.49
2.41
1.52
0.56
4.95
6º
A
b
E
e
e1
L
R
S1
W
D
α
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
SIPEX Pkg Signoff Date/Rev:
JL Sept23-05 / RevA
Date: 12/9/05
SPX2954, 250mA Low Dropout Voltage Regulator
© Copyright 2005 Sipex Corporation
13
PACKAGE: 3 PIN TO-220
Thermal
Pad
E
E2
øP
Q
(H1)
D2
D
D1
1
L1
FRONT
VIEW
b2
BACK
VIEW
L
e1
E1
e
b
Seating
Plane
A
3 Pin TO-220
JEDEC TO-220
Variation AB
Dimensions in Millimeters:
Conversion Factor:
A1
Dimensions in Inches:
Controlling Dimension
SYMBOL
1 Inch = 25.40 mm
MIN
0.140
0.020
0.080
0.015
0.045
0.014
0.560
0.330
0.480
0.380
0.270
-
NOM
-
-
-
0.027
0.057
-
-
-
-
-
-
MAX
0.190
0.055
0.115
0.040
0.070
0.024
0.650
0.355
0.507
0.420
0.350
0.030
MIN
3.56
0.51
2.03
0.25
1.14
0.25
14.22
8.38
12.19
9.65
6.86
-
NOM
-
-
-
0.51
1.45
-
-
-
-
-
-
MAX
4.83
1.27
2.79
1.02
1.78
0.51
16.51
8.89
12.70
10.67
8.89
0.76
H1
A
A1
A2
b
b2
c
SIDE
VIEW
Chamfer
Optional
D
D1
D2
E
E1
E2
e
-
-
.100 BSC
2.54 BSC
e1
H1
L
L1
ΦP
Q
.200 BSC
5.08 BSC
0.230
0.500
-
0.139
0.100
-
-
-
-
-
0.270
0.580
0.250
0.161
0.135
5.84
12.70
-
3.30
2.54
-
-
-
-
-
6.86
14.73
6.35
4.06
3.30
C
A2
SIPEX Pkg Signoff Date/Rev:
JL Aug4-05 / Rev A
Date: 12/9/05
SPX2954, 250mA Low Dropout Voltage Regulator
© Copyright 2005 Sipex Corporation
14
PACKAGE: 8 PIN NSOIC
D
D/2
SIDE VIEW
A2
7
8
5
6
A
E/2
E1/2
A1
Seating Plane
E
E1
4
2
3
1
(L1)
Pin1 Designator
to be within this
INDEX AREA
(D/2 x E1/2)
e
b
TOP VIEW
h
ø1
FRONT VIEW
Gauge Plane
ø2
h
R1
R
L2
ø1
c
Seating
Plane
ø
L
8 Pin NSOIC
JEDEC MS-012
Variation AA
Dimensions in Inches
Conversion Factor:
1 Inch = 25.40 mm
Dimensions in Millimeters:
Controlling Dimension
SYMBOL
MIN
NOM
MAX
MIN
NOM
MAX
A
1.35
0.10
1.25
0.31
0.17
-
1.75
0.25
1.65
0.51
0.25
0.053
0.004
0.049
0.012
0.007
-
0.069
0.010
0.065
0.020
0.010
A1
A2
b
-
-
-
-
-
-
c
-
-
E
6.00 BSC
3.90 BSC
1.27 BSC
0.236 BSC
E1
e
0.154 BSC
0.050 BSC
h
0.25
0.40
0.50
1.27
0.010
0.016
-
0.020
0.050
L
-
-
L1
L2
R
1.04 REF
0.041 REF
0.25 BSC
0.010 BSC
0.07
0.07
0º
-
-
-
0.003
0.003
0º
-
-
-
R1
ø
-
-
-
8º
15º
-
-
8º
15º
-
ø1
ø2
5º
-
5º
-
0º
-
0º
-
D
4.90 BSC
0.193 BSC
SIPEX Pkg Signoff Date/Rev:
JL Aug16-05 / Rev A
Date: 12/9/05
SPX2954, 250mA Low Dropout Voltage Regulator
© Copyright 2005 Sipex Corporation
15
PACKAGE: 3 PIN SOT-223
D
b2
E
E1
3
2
1
e
e1
TOP VIEW
b
Gauge Plane
A2
A
L2
c
A1
ø
L
Seating Plane
FRONT VIEW
3 Pin SOT-223
JEDEC TO-261
Variation AA
Inches
Conversion Factor:
1 Inch = 25.40 mm
Millimeters
Controlling Dimension
SYMBOL
MIN
-
NOM
-
-
1.60
0.76
3.00
0.30
6.50
7.00
MAX
MIN
-
NOM
-
-
0.063
0.030
0.118
0.012
0.256
0.276
MAX
0.071
0.004
0.067
0.033
0.122
0.014
0.264
0.287
0.146
A
A1
A2
b
b2
c
D
E
E1
e
e1
L
1.80
0.10
1.70
0.84
3.10
0.35
6.70
7.30
3.70
0.02
1.50
0.66
2.90
0.23
6.30
6.70
3.30
0.001
0.060
0.026
0.114
0.010
0.248
0.264
0.130
3.50
0.138
2.30 BASIC
4.60 BASIC
-
0.25 BASIC
-
0.091 BASIC
0.182 BASIC
-
0.010 BASIC
-
0.75
0º
-
0.030
0º
-
L2
ø
10º
10º
SIPEX Pkg Signoff Date/Rev:
JL Aug8-05/Rev A
Date: 12/9/05
SPX2954, 250mA Low Dropout Voltage Regulator
© Copyright 2005 Sipex Corporation
16
ORDERING INFORMATION
PART NUMBER
ACCURACY
OUTPUT VOLTAGE
PACKAGE
SPX2954AT-3-3 ............................................ 0.5% ................................... 3.3V ........................................................ 3 lead TO-263
SPX2954AT-5-0 ............................................ 0.5% ................................... 5.0V ........................................................ 3 lead TO-263
SPX2954T-3-3 ................................................. 1% ..................................... 3.3V ........................................................ 3 lead TO-263
SPX2954T-5-0 ................................................. 1% ..................................... 5.0V ........................................................ 3 lead TO-263
SPX2954AN-3-3 ............................................ 0.5% ................................... 3.3V ........................................................ 3 lead TO-92
SPX2954AN-5-0 ............................................ 0.5% ................................... 5.0V ........................................................ 3 lead TO-92
SPX2954N-3-3 ................................................ 1% ..................................... 3.3V ........................................................ 3 lead TO-92
SPX2954N-5-0 ................................................ 1% ..................................... 5.0V ........................................................ 3 lead TO-92
SPX2954AU-3-3 ............................................ 0.5% ................................... 3.3V ........................................................ 3 lead TO-220
SPX2954AU-5-0 ............................................ 0.5% ................................... 5.0V ........................................................ 3 lead TO-220
SPX2954U-3-3 ................................................ 1% ..................................... 3.3V ........................................................ 3 lead TO-220
SPX2954U-5-0 ................................................ 1% ..................................... 5.0V ........................................................ 3 lead TO-220
SPX2954AS-3-3 ............................................ 0.5% ................................... 3.3V ........................................................ 8 lead SOIC
SPX2954AS-5-0 ............................................ 0.5% ................................... 5.0V ........................................................ 8 lead SOIC
SPX2954S-3-3 ................................................. 1% ..................................... 3.3V ........................................................ 8 lead SOIC
SPX2954S-5-0 ................................................. 1% ..................................... 5.0V ........................................................ 8 lead SOIC
SPX2954AM3-3-3 .......................................... 0.5% ................................... 3.3V ........................................................ 3 lead SOT-223
SPX2954AM3-5-0 .......................................... 0.5% ................................... 5.0V ........................................................ 3 lead SOT-223
SPX2954M3-3-3 .............................................. 1% ..................................... 3.3V ........................................................ 3 lead SOT-223
SPX2954M3-5-0 .............................................. 1% ..................................... 5.0V ........................................................ 3 lead SOT-223
Please consult the factory for pricing and availability on a Tape-On-Reel option.
Corporation
ANALOG EXCELLENCE
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
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 herein; neither does it convey any license under its patent rights nor the rights of others.
Date: 12/9/05
SPX2954, 250mA Low Dropout Voltage Regulator
© Copyright 2005 Sipex Corporation
17
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