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 a 3-pin SOT-223
package and an 8-pin SOIC package.
FEATURES
■■
5.0V and 3.3V versions at 250mA output
■■
Accurate 0.5% for SPX2954A
■■
Very low quiescent current
■■
Low dropout: 310mV at 250mA
■■
Extremely tight load and line regulation
■■
Very low temperature coefficient
■■
Current and thermal limiting
■■
Need only 1µF for stability
■■
Direct replacement for LP2954
■■
Error flag warns of output dropout
■■
Logic-controlled electronic shutdown
■■
Programmable output from 1.24V to 30V
Typical Application
V
IN
100K
ERROR
OUTPUT
5
8
VIN
ERROR
VOUT
1
1.2 to 30V
SPX2954
SHUTDOWN
INPUT
3
SD
GND
4
R
1
+
3.3 F
FB
7
.01 F
1.23V
V
REF
R
2
Typical Application
REV1A
1/15
SP
X2954
Absolute Maximum Ratings
Stresses beyond the limits listed below may cause
permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect
device reliability and lifetime.
Power Dissipation ..................................... Internally Limited
Lead Temperature (soldering, 5 seconds)................. 260°C
Storage Temperature .................................. -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 Voltage ............................... -0.3V to 30V
ESD Rating ............................................................. 2kV Min
REV1A
2/15
SP
X2954
Electrical Characteristics
Unless otherwise noted: V
IN
= V
O
+ 1V, I
L
= 100µA, C
L
= 1µF
(2)
T
A
= 25°C.
SPX2954A
Parameter
3.3V Versions
T
J
= 25°C
Output Voltage
-25°C ≤ T
J
≤ 85°C
Full Operating Temp.
Output Voltage
5V Versions
T
J
= 25°C
Output Voltage
-25°C ≤ T
J
≤ 85°C
Full Operating Temp.
Output Voltage
All Voltage Options
Output Voltage Temperature
Coefficient
(1)
Line Regulation
(3)
Load Regulation
(3)
V
O
+ 1V ≤ V
IN
≤ 30V; I
(4)
100µA ≤ I
L
≤ 250mA
I
L
= 1mA
Dropout Voltage
(5)
I
L
= 100mA
I
L
= 250mA
I
L
= 1mA
Ground Current
I
L
= 100mA
I
L
= 250mA
Current Limit
V
OUT
= 0
20
0.03
0.04
60
290
310
150
3
10
270
0.05
Thermal Regulation Output Noise,
10Hz to 100kHz
C
L
= 1µF
C
L
= 200µF
C
L
= 3.3µF, Bypass = 0.01µF from pin 7
to Pin 1 (8 pin versions)
8-Pin Version Only
Reference Voltage
Feedback Pin Bias Current
Vref Temperature Coefficient
Feedback I
BIAS
Temperature
Coefficient
1.220
Over Temp
(6)
1.190
40
20
0.1
1.235
1.250
2.270
60
1.210
1.185
40
50
0.1
1.235
1.260
1.285
60
V
V
nA
ppm/°C
nA/°C
430
160
100
100
0.10
0.20
100
450
500
170
6
14
550
0.2
50
0.04
0.10
60
290
310
150
3
10
270
0.05
430
160
100
150
0.20
0.30
100
450
500
170
6
14
550
0.2
µA
mA
mA
%/W
µV
rms
µV
rms
µV
rms
mV
ppm/°C
%
%
100µA ≤ I
L
≤ 250mA; T
J
≤ T
MAX
4.975
4.950
4.940
4.925
5.0
5.0
5.0
5.0
5.025
5.050
5.060
5.075
4.950
4.925
4.900
4.850
5.0
5.0
5.0
5.0
5.050
5.075
5.100
5.150
V
V
100µA ≤ I
L
≤ 250mA; T
J
≤ T
MAX
3.284
3.267
3.260
3.251
3.3
3.3
3.3
3.3
3.317
3.333
3.340
3.350
3.267
3.251
3.234
3.201
3.3
3.3
3.3
3.3
3.333
3.350
3.366
3.399
V
V
SPX2954
Units
Max
Min
Typ
Max
Conditions
Min
Typ
REV1A
3/15
SP
X2954
SPX2954A
Parameter
Error Comparator
Output Leakage Current
Output Low Voltage
Upper Threshold Voltage
(7)
Lower Threshold Voltage
(7)
Hystersis
(7)
Shutdown
Input Logic Voltage
Low (Regulator ON)
High (Regulator OFF)
V
S
= 2.4V
V
S
= 30V
2.0
30
400
3
50
800
10
1.3
0.7
2.0
30
400
3
50
800
10
1.3
0.7
V
V
OH
= 30V
V
IN
= V
O
- 0.5V; I
OL
= 400µA
40
0.01
150
60
75
15
95
1
250
40
0.01
150
60
75
15
95
1
250
µA
mA
mA
mV
mV
SPX2954
Units
Max
Min
Typ
Max
Conditions
Min
Typ
Shutdown Input Current
Regulator Output Current in
Shutdown
(8)
Thermal Resistance Ѳ
JA
SOIC-8
SOT-223
µA
µA
128.4
62.3
°C/W
°C/W
NOTES:
1. Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range.
2. Unless otherwise specified all limits guaranteed for T
J
= 25°C, V
IN
= 6V, I
L
= 100µA and C
L
= 1µF. 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.
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.
4. Line regulation for the SPX2954 is tested at I
L
= 1mA.
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.
6. V
REF
≤ V
OUT
≤ (V
IN
- 1V), 2.3 ≤ V
IN
≤ 30V, 100µA ≤ I
L
≤ 250mA, T
J
≤ T
JMAX
.
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 95mV x 5V/1.235 = 384mV. 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.
This content is originally created by EEWORLD forum user Qi IC Kan MCU . If you want to reprint or use it for commercial purposes, you must obtain the author's consent and indicate the source
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