SPX2975N-L-3.3 [SIPEX]
Fixed Positive LDO Regulator, 3.3V, PBCY3, TO-92, 3 PIN;
| 型号： | SPX2975N-L-3.3 |
| 厂家： | 
SIPEX CORPORATION |
| 描述： | Fixed Positive LDO Regulator, 3.3V, PBCY3, TO-92, 3 PIN 输出元件 调节器 |
| 文件： | 总10页 (文件大小：422K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SPX2975
180 mA Low Dropout Voltage Regulators
FEATURES
APPLICATIONS
• 3.0V, 3.3V and 5.0V Fixed Output Voltages
• Very Low Quiescent Current
• Battery Powered Systems
• Cordless Telephones
• Low Dropout Voltage
• Radio Control Systems
• Portable/Palm Top/Notebook Computers
• Portable Consumer Equipment
• Portable Instrumentation
• Avionics
• Extremely Tight Load And Line Regulation
• Very Low Temperature Coefficient
• Needs Only 1µF For Stability
• Current & Thermal Limiting
• Unregulated DC Input Can Withstand -20V Reverse Battery
And +60V Positive Transients
• Automotive Electronics
• SMPS Post-Regulator
• Voltage Reference
• Similar Replacement For LP2950/LP2951 Sockets
SPX2975 SO-8 versions only
• Error Flag Warns Of Output Dropout
• Logic- Controlled Electronic Shutdown
• Output Programmable from 1.24 to 29V
PRODUCT DESCRIPTION
The SPX2975 is a low power voltage regulator. This device is an excellent choice for use in battery-powered applications such as
cordless telephones, radio control systems, and portable computers. The SPX2975 features very low quiescent current and very low
dropout voltage (Typ. 50mV at light load and 380 mV at 180 mA). This includes a tight initial tolerance of 0.5% typ., extremely good
load and line regulation 0.05% typ. and very low output temperature coefficient, making the SPX2975 useful as a low-power voltage
reference. Other additional key features include higher output current (150mA), positive transient protection up to 60V (Load dump),
and the ability to survive an unregulated input voltage transient of -20V below ground (reverse battery).
The error flag output feature is used as power-on reset for warning of a low output voltage, due to falling voltage input of batteries.
Another feature is the logic-compatible shutdown input which enables the regulator to be switched on and off. The SPX2975 is
offered in a 3-pin TO-92 package compatible with other 5V regulators. The SPX2975 is available in 8-pin plastic, SO-8 packages.
PIN CONNECTIONS
8-Pin Surface Mount (S)
TO-92 (N)
2
1
3
VIN
VOUT
SENSE
1
2
3
4
8
7
6
5
FEEDBACK
5V TAP
SPX2975
SHUTDOWN
GND
VOUT
VIN
GND
ERROR
Bottom View
Top View
Rev. 10/30/00
SPX2975
ABSOLUTE MAXIMUM RATINGS
Power Dissipation..........................................Internally Limited
Lead Temp. (Soldering, 5 Seconds) ................................ 260°C
Storage Temperature Range ............................-65° to +150°C
Operating Junction Temperature Range (Note 10)
Input Supply Voltage (Survival) ......................-20V to +60V
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
SPX2975...................................................-55° to +150°C
SPX2975AC/SPX2975C ..........................-40° to +125°C
ELECTRICAL CHARACTERISTICS at VS=15V, TA=25°C, unless otherwise specified. Boldface apply over the full operating
temperature range.
PARAMETER
CONDITIONS
SPX2975AC
SPX2975C
Typ
UNITS
(Note 2)
Min
3.2835
3.267
Typ
Max
Min
Max
Output Voltage
TJ = 25°C
3.3
3.3165
3.333
3.3396
3.267
3.2505
3.2604
3.3
3.333
3.695
3.3396
V
-25°C ≤TJ ≤85°C
-40°C ≤TJ≤ +125°C
100 µA ≤IL ≤180 mA
TJ ≤TJMAX
3.2608
Output Voltage
Output Voltage
3.2505
3.3
3.3495
3.201
3.3
3.399
V
TJ = 25°C
4.975
4.95
4.94
5.0
5.0
5.0
5.025
5.050
5.06
4.95
4.925
4.90
5.0
5.0
5.0
5.05
5.075
5.10
V
-25°C ≤TJ ≤85°C
-40°C ≤TJ≤ +125°C
100 µA ≤IL ≤180 mA
T≤T
Output Voltage
4.925
5.0
5.075
4.85
5.0
5.15
V
Output Voltage
20
50
ppm/°C
Temperature Coefficient
Line Regulation (Note 3)
(Note 1)
6V ≤VIN ≤30V (Note 4)
100 µA ≤IL ≤ 180 mA
IL = 100µ A
IL = 100 mA
IL = 180 mA
0.03
0.04
0.1
0.1
0.04
0.1
0.2
0.2
%
%
mV
Load Regulation (Note 3)
Dropout Voltage (Note 5)
50
80
50
80
380
450
450
500
380
450
450
500
Ground Current
150
170
150
170
IL = 100 µA
IL = 100 mA
IL = 180 mA
µA
mA
mA
8
12
8
12
18
22
18
22
Current Limit
VOUT = 0
130
200
130
200
mA
Thermal Regulation
0.05
0.2
0.05
0.2
%/W
Output Noise,
430
160
100
430
160
100
CL = 1µF
µV rms
10Hz to 100kHz
CL = 200 µF
CL = 13.3 µF
(Bypass = 0.01 µF
pins 7 to 1(SPX2975))
8-Pin Versions Only
Reference Voltage
Reference Voltage
SPX2975AC
SPX2975C
1.22
1.19
1.235
1.25
1.27
1.21
1.18
1.23
1.26
1.28
V
V
Over Temperature
( Note 6)
Feedback Pin Bias Current
Reference Voltage Temperature
Coefficient
Feedback Pin Bias Current
Temperature Coefficient
Output Leakage Current
40
20
60
40
50
60
nA
ppm/°C
(Note 7)
0.1
0.1
nA/°C
VOH = 30V
0.01
150
1
250
0.01
150
1
250
µA
mV
Output Low Voltage
VIN = 4.5V
IOL = 400µA
(Note 8)
(Note 8)
(Note 8)
Upper Threshold Voltage
Lower Threshold Voltage
Hysteresis
40
60
75
15
40
60
75
15
mV
mV
mV
95
95
Rev. 10/30/00
SPX2975
PARAMETER
CONDITIONS
SPX2975AC
Typ
SPX2975C
Typ
UNITS
(Note 2)
Min
Max
Min
Max
Input Logic Voltage
Low (Regulator ON)
High (Regulator OFF)
VS = 2.4V
1.3
0.7
1.3
0.7
V
2
2
Shut Down Pin Input Current
30
675
3
50
800
10
30
675
3
50
800
10
µA
µA
VS = 30V
(Note 9)
Regulator Output Current in
Shutdown
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, VIN = 6V, IL = 100µA and CL = 1 µF. Additional conditions for the 8-pin versions are
feedback tied to 5V tap and output tied to output sense (VOUT = 5V) and VSHUTDOWN ≤ 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 SPX2975 is tested at 150°C for IL = 1mA. For IL = 100µA and TJ = 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 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≤ 100 mA, 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 = (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 95mV x 5V/1.235 = 384mV. Thresholds remain constant as a percent of VOUT as
V
OUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed.
Note 8: VSHUTDOWN ≥ 2V, VIN ≤ 30V, VOUT =0, Feedback pin tied to 5V Tap.
Note 9: All typical values are not guaranteed. The value could vary from lot to lot.
Note 10: The junction -to-ambient thermal resistance of the TO-92 package is 180°C/ W with 0.4” leads and 160°C/ 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.
BLOCK DIAGRAM
UNREGULATED DC
5V @ 180mA
MAX
1
7
8
+
INPUT
FEEDBACK
OUTPUT
2
SENSE
Ω
180k ..
+
_
6
ERROR
AMPLIFIER
3
FROM
CMOS OR
TTL
Ω
5V TAP
330k ..
SHUTDOWN
+
Ω
60k ..
5
µ
1 F..
+
+
_
______
ERROR
60 mV
ERROR DETECTION
COMPARATOR
TO CMOS OR
TTL
1.23V
+
4
REFERENCE
GROUND
SPX2975 Block Diagram
Rev. 10/30/00
SPX2975
APPLICATION HINTS
EXTERNAL CAPACITORS
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 400µA, this value adds to battery drain in a low battery
condition. Suggested values range from 100K to 1MΩ. If the output
is unused this resistor is not required.
The stability of the SPX2975 requires a 1.0µF 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 5Ω or
less and resonant frequency above 500kHz are the most
important parameters in the value of the capacitor. The
capacitors value may be increased without limit.
PROGRAMMING THE OUTPUT VOLTAGE OF
SPX2975
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 3.3µF or greater must be used for the condition of 10mA
load at 1.23V output.
The SPX2975 may be pin-strapped for 5V using its internal voltage
divider by tying Pin 1 (output) 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 .
As seen in Figure 2, an external pair of resistors is required.
Refer to the below equation for the programming of the output
voltage:
The SPX2975, unlike other low dropout regulators will remain
stable and in regulation with no load in addition to the internal
V
OUT = VREF × (1 + R1\ R2)+ IFBR1
voltage divider.
This feature is especially important in
applications like CMOS RAM keep-alive. When setting the
output voltage of the SPX2975, a minimum load of 1µA is
recommended
The Vref is 1.235 and IFB is the feedback bias current, nominally
-20nA. The minimum recommended load current of 1µA forces an
upper limit of 1.2 MΩ on value of R2. If no load is presented the IFB
produces an error of typically 2% in VOUT which may be eliminated at
room temperature by trimming R1. To improve the accuracy choose
the value of R2 = 100k this reduces the error by 0.17% and increases
the resistor program current by 12µA. Since the SPX2975 typically
draws 60µA at no load with Pin 2 open-circuited this is a small price
to pay
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 1µA
tantalum or aluminum electrolytic capacitor should be placed
from the input to the ground.
Instability can occur if there is stray capacitance to the SPX2975
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 100 pF capacitor between
output and feedback and increasing the output capacitor to at
least 3.3µF.
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 SPX2975 but is relatively inefficient, as increasing the
capacitor from 1µF to 220µF only decreases the noise from 430µV to
160µV rms for a 100kHz bandwidth at 5V output.
ERROR DETECTION COMPARATOR OUTPUT
The Comparator produces a logic low output whenever the
SPX2975 output falls out of regulation by more than around 5%.
This is around 60mV 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 SPX2975 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 SPX2975 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.
Noise could also be reduced fourfold by a bypass capacitor across R1,
since it reduces the high frequency gain from 4 to unity. Pick
C
BYPASS ≅ 1 / 2πR1 × 200 Hz
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 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.
Rev. 10/30/00
SPX2975
TYPICAL PERFORMANCE CHARACTERISTICS
Rev. 10/30/00
SPX2975
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Rev. 10/30/00
SPX2975
TYPICAL APPLICATIONS
4.75V
OUTPUT
+V
IN
VOLTAGE
_______
ERROR*
100K
8
+V
______
IN
ERROR
OUTPUT
5
ERROR
1.2 to30V
1
VOUT
SPX2975
+
3.3uF
.01uF
3
R
1
SHUTDOWN
INPUT
SD
FB
GND
+
5.0V
+
7
4
1.23V
VREF
INPUT
+
1.3V
VOLTAGE
+
R
2
* See Application
_______
Figure 2. Adjustable Regulator
Figure 1. ERROR Output Timing
+VIN
+VIN
470K
8
Ω
..
+VIN
______
5
8
+VIN
VOUT
ERROR
1
______
5
VOUT
ERROR
470KΩ
..
ERROR
1
*VOUT= V
IN
OUTPUT
VOUT
SPX2975
SPX2975
+
3
R1
µ
1 F
SD
3
SHUTDOWN
INPUT
SD
FB
7
GND
4
FB
GND
4
7
*MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 4mV to 400mV.
R2
DEPENDING ON LOAD CURRENT, CURRENT LIMIT IS TYPICALLY 160mA
Wide Input Voltage Range Current Limiter
Latch Off When Error Flag Occurs
Rev. 10/30/00
SPX2975
TYPICAL APPLICATIONS (continued)
6V
+
SEALED
LEAD-
ACID
BATTERY
SOURCE
Ω
1.5K
Ω
120K
FB
8
1N457
+V
IN
1
2
MAIN V-
SPX385
VOUT
SPX2975
MEMORY V+
SENSE
Ω
400K
+
FOR 5.5 V
3
Ω
20K
µ
1 F
SD
Ω
100K
GND
4
NI-CAD
BACKUP
BATTERY
Low Battery Disconnect
8
2
39kΩ
SENSE
VOUT
+V
IN
ERROR
______
+VOUT= 5V
5
3
1
7
RESET
+
1
F
µ
SPX2975
-
C4
SD
FB
+
GND
4
TAP
6
39kΩ
1%
1%
100kΩ
1kΩ
-
100kΩ
C1
+
6V
LEAD-
<5.8V**
<6.0V**
<6.2V**
ACID
-
100kΩ
BATTERY
C2
+
-
100κΩ
1%
1kΩ
C3
+
10kΩ
20kΩ
R3
* OPTIONAL LATCH OFF WHEN DROPOUT OCCURS. ADJUST R3 FOR C2 SWITCHING
WHEN VIN IS 6.0V
** OUTPUTS GO LOW WHEN VIN DROPS BELOW DESIGNATED THRESHOLDS
1%
Regulator with State-of-Charge indicator
Rev. 10/30/00
SPX2975
TYPICAL APPLICATIONS (continued)
+VIN
8
Ω
10K
+VIN
_______ 5
3
5 DEGREE SHUTDOWN FLAG
AUX SHUTDOWN
SD
ERROR
OFF
SPX2975
ON
1
VOUT
FB
GND
EXTERNAL CIRCUIT
PROTECTED
4
7
OR
+
OVER TEMPERATURE
(V+ GOES OFF
TEMP
SENSOR
TEMP> 125)
RELAY
SPX35
Ω
8.2K
System Over Temperature Protection Circuit
+5V
4.7mA
4
20mA
UNREGULATED INPUT
OUTPUT
8
+VIN
5
1
7
330K
Ω ..
IN
1
2
VOUT
2N5432
VOUT
1N4001
SPX2975
27KΩ ..
SPX2975
FB
2
0.1uF
3
5V
VTAP
SENSE
GND
GND
4
FB
7
OUTPUT
+
Ω ..
360K
4
4.7uF
LOAD
50mA
TO
1N457
MIN VOLTAGE = 4V
300 mA
Open Circuit Detector for 4mA to 20mA Current Loop
300 mA Regulator with 0.75 Dropout
Rev. 10/30/00
SPX2975
ORDERING INFORMATION
Ordering No.
SPX2975N-3.0
Precision Output Voltage Packages
1%
1%
3.0V
3.3V
5.0V
3.0V
3.3V
5.0V
3.0V
3.3V
5.0V
3.0V
3.3V
5.0V
3 Lead TO-92
3 Lead TO-92
3 Lead TO-92
3 Lead TO-92
3 Lead TO-92
3 Lead TO-92
8 Lead SOIC
8 Lead SOIC
8 Lead SOIC
8 Lead SOIC
8 Lead SOIC
8 Lead SOIC
SPX2975N-3.3
1%
SPX2975N-5.0
0.5%
0.5%
0.5%
1%
SPX2975ACN-3.0
SPX2975ACN-3.3
SPX2975ACN-5.0
SPX2975CP-3.0
SPX2975CP-3.3
SPX2975CP-5.0
SPX2975ACP-3.0
SPX2975ACP-3.3
SPX2975ACP-5.0
1%
1%
0.5%
0.5%
0.5%
Corporation
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.
Rev. 10/30/00
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