TPS723 [TI]
具有使能功能的 200mA、负电压、可调节低压降稳压器;
| 型号： | TPS723 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 具有使能功能的 200mA、负电压、可调节低压降稳压器 电源电路 线性稳压器IC |
| 文件： | 总10页 (文件大小：192K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ꢀꢁ ꢂ ꢃꢄ ꢅꢆ ꢇ
ꢀꢁ ꢂ ꢃꢄ ꢅꢄ ꢈ
www.ti.com
SLVS346−SEPTEMBER 2003
ꢄ
ꢆ
ꢆ
ꢉ
ꢊ
ꢋ
ꢌ
ꢍ
ꢎ
ꢉ
ꢏ
ꢍ
ꢐ
ꢂ
ꢑ
ꢒ
ꢓ
ꢐ
ꢔ
ꢓ
ꢉ
ꢁ
ꢂ
ꢕ
ꢕ
ꢏ
ꢑ
ꢔ
ꢋ
ꢀ
ꢐ
ꢖ
ꢑ
ꢍ
ꢗ
ꢀ
ꢁ
ꢗ
ꢀ
ꢌ
ꢍ
ꢎ
ꢉ
ꢘ
ꢕ
ꢍ
ꢁ
ꢍ
ꢗ
ꢀ
ꢌ
ꢐ
ꢏ
ꢑ
ꢋ
ꢕ
ꢕ
ꢑ
ꢔ
ꢗ
ꢌ
ꢋ
ꢀ
ꢍ
ꢕ
ꢂ
FEATURES
APPLICATIONS
D
D
D
D
D
Optical Drives
Optical Networking
D
D
D
Ultralow Noise: 60-µV
Typical
RMS
Noise Sensitive Circuitry
GaAs FET Gate Bias
Video Amplifiers
High PSRR: 65-dB Typical at 1 kHz
Low Dropout Voltage: 280-mV Typical at
200 mA, 2.5 V
DESCRIPTION
D
D
D
D
Available in −2.5 V, and Adjustable
(−1.2 V to −10 V) Versions
The TPS723xx family of low-dropout (LDO) negative
voltage regulators offers an ideal combination of features
to support low noise applications. The devices are capable
of operating with input voltages from −10 V to −2.7 V, and
supporting outputs from −10 V to −1.2 V. These regulators
are stable with small, low-cost ceramic capacitors, and
include enable (EN) and noise reduction (NR) functions.
Thermal short-circuit and over-current protections are
provided by internal detection and shutdown logic. High
PSRR (65 dB at 1 k Hz) and low noise (60 µVRMS) make
the TPS723xx ideal for low-noise applications.
Stable With a 2.2-µF Ceramic Output
Capacitor
Less Than 2-µA Typical Quiescent Current in
Shutdown Mode
2% Overall Accuracy (Line, Load,
Temperature)
D
D
D
Thermal and Overcurrent Protection
5-Pin SOT-23 (DBV) Package
The TPS723xx uses a precision voltage reference to
achieve 2% overall accuracy over load, line, and
temperature variations. Available in a small SOT23−5
package, the TPS723xx family is fully specified over a
temperature range of −40°C to 125°C.
−40°C to 125°C Operating Junction
Temperature Range
DBV PACKAGE (TOP VIEW)
TPS72301
TYPICAL APPLICATION CIRCUIT
GND
IN
1
2
5
OUT
2
ON
5
+1.5 V
OUT
NR
IN
OFF
GND
−1.5 V
EN
3
4
FB
ON
Adjustable Option
3
DBV PACKAGE (TOP VIEW)
TPS723xx
4
EN
GND
IN
1
2
5
OUT
GND
1
ON
+1.5 V
OFF
GND
−1.5 V
ON
EN
3
4
NR
Fixed Option
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
ꢁꢕ ꢍ ꢘꢗ ꢙ ꢀꢐ ꢍꢏ ꢘ ꢋꢀꢋ ꢚꢛ ꢜꢝ ꢞ ꢊꢟ ꢠꢚꢝꢛ ꢚꢡ ꢢꢣ ꢞ ꢞ ꢤꢛꢠ ꢟꢡ ꢝꢜ ꢥꢣꢦ ꢧꢚꢢ ꢟꢠꢚ ꢝꢛ ꢨꢟ ꢠꢤꢩ ꢁꢞ ꢝꢨꢣ ꢢꢠꢡ
ꢢ ꢝꢛ ꢜꢝꢞ ꢊ ꢠꢝ ꢡ ꢥꢤ ꢢ ꢚ ꢜꢚ ꢢ ꢟ ꢠꢚ ꢝꢛꢡ ꢥ ꢤꢞ ꢠꢪꢤ ꢠꢤ ꢞ ꢊꢡ ꢝꢜ ꢀꢤꢫ ꢟꢡ ꢐꢛꢡ ꢠꢞ ꢣꢊ ꢤꢛꢠ ꢡ ꢡꢠ ꢟꢛꢨ ꢟꢞ ꢨ ꢬ ꢟꢞ ꢞ ꢟ ꢛꢠꢭꢩ
ꢁꢞ ꢝ ꢨꢣꢢ ꢠ ꢚꢝ ꢛ ꢥꢞ ꢝ ꢢ ꢤ ꢡ ꢡ ꢚꢛ ꢮ ꢨꢝ ꢤ ꢡ ꢛꢝꢠ ꢛꢤ ꢢꢤ ꢡꢡ ꢟꢞ ꢚꢧ ꢭ ꢚꢛꢢ ꢧꢣꢨ ꢤ ꢠꢤ ꢡꢠꢚ ꢛꢮ ꢝꢜ ꢟꢧ ꢧ ꢥꢟ ꢞ ꢟꢊ ꢤꢠꢤ ꢞ ꢡꢩ
Copyright 2003, Texas Instruments Incorporated
ꢀ ꢁ ꢂꢃ ꢄ ꢅ ꢆ ꢇ
ꢄ
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢅ
ꢈ
www.ti.com
SLVS346−SEPTEMBER 2003
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during
storage or handling to prevent electrostatic damage to the MOS gates.
ORDERING INFORMATION
(1)
VOLTAGE
T
PACKAGE
PART NUMBER
(2) (3)
TPS72301DBVR
SYMBOL
TO8I
J
Variable −1.2 V to −10 V
−2.5 V
TPS72301DBVT
(2)
−40°C to 125°C
SOT-23 (DBV)
(3)
TPS72325DBVR
TPS72325DBVT
TO2I
(1)
Custom output voltages from −1.2 V to −9 V in 100-mV increments are available. Minimum order quantities apply. Contact TI for details and
availability.
(2)
(3)
The DBVT indicates tape and reel of 250 parts.
The DBVR indicates tape and reel of 3000 parts.
ABSOLUTE MAXIMUM RATINGS
over operating temperature range (unless otherwise noted)
(1)(2)
UNITS
Input voltage range, V
IN
−11 V to 0.3 V
Enable voltage range, V
−V to 5 V
I
(EN)
OUT
Output voltage range, V
−11 + V
DO
Output current, I
OUT
Internally limited
Indefinite
Output short-circuit duration
Continuous total power dissipation, P
See Dissipation Rating Table
−55°C to 150°C
−65°C to 150°C
2 kV
D
Junction temperature range, T
J
Storage temperature range, T
stg
ESD rating, HBM
(1)
Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
All voltage values are with respect to network ground terminal.
(2)
RECOMMENDED OPERATING CONDITIONS
MIN
−10
NOM
MAX
−2.7
−1.2
125
UNIT
V
Input voltage range, V
IN
Output voltage range, V
OUT
−10 + V
−40
V
DO
Operating junction temperature, T
°C
J
2
ꢀꢁ ꢂ ꢃꢄ ꢅꢆ ꢇ
ꢀꢁ ꢂ ꢃꢄ ꢅꢄ ꢈ
www.ti.com
SLVS346−SEPTEMBER2003
ELECTRICAL CHARACTERISTICS
over operating junction temperature range, V = V
− 0.5 V, I
OUT
= 1 mA, V
(EN)
= 1.5 V, C
OUT
= 2.2 µF, C
= 0.01 µF (unless
IN
OUT(nom)
(NR)
otherwise noted). Typical values are at 25°C
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
−2.7
UNIT
(1)
V
V
Input voltage range
−10
V
V
V
IN
Feedback reference voltage TPS72301
T = 25°C
−1.210 −1.186
−10 + V
−1.162
(FB)
J
Output voltage range
Accuracy
TPS72301
Nominal
V
(FB)
1%
DO
T = 25°C
J
−1%
TPS72325 vs
V
−2%
1%
1%
2%
3%
OUT
V
/I
/T
IN OUT
−10 V < V < V
− 0.5 V, 10 µA <
IN
OUT
I
< 200 mA
TPS72301 vs
/I /T
OUT
−3%
V
IN OUT
V
V
%/V
Line regulation
−10 V < V < V
− 0.5 V
0.04
%/V
OUT
IN
IN
OUT(nom)
%/I
OUT
Load regulation
0 mA < I < 200 mA
0.002
%/mA
OUT
O
Dropout voltage at
V
TPS72325
I
= 200 mA
OUT
280
550
130
500
800
200
mV
mA
DO
V
= 0.96 x V
OUT(nom)
OUT
I
Current limit
V
= 0.85 x V
OUT(nom)
300
(CL)
OUT
I
= 0 mA, (I )
Q
OUT
−10 V < V < V
− 0.5 V
IN
OUT
OUT
I
Ground pin current
µA
(GND)
I
= 200 mA,
OUT
350
500
−10 V < V < V
− 0.5 V
IN
−0.4 V < V
< 0.4 V,
(EN)
I
I
Shutdown ground pin current
Feedback pin current
0.1
0.05
65
2.0
1.0
µA
µA
(SHDN)
(FB)
−10 V < V < V
− 0.5 V
− 0.5 V
OUT
IN
OUT
, −10 V < V < V
IN
I
= 200 mA, 1 kHz, C = C
=
OUT
IN
OUT
10 µF
= 200 mA, 10 kHz, C = C =
OUT
Power supply rejection
ratio
PSRR
TPS72325
TPS72325
dB
I
OUT
IN
48
10 µF
C
OUT
= 10 µF, 10 Hz = 100 kHz,
V
n
Output noise voltage
60
1
µVrms
I
= 200 mA
OUT
t
Startup time
V
= −2.5 V, C
= 1 µF, R = 25 Ω
ms
V
(STR)
OUT
OUT
L
V
V
V
V
Enable threshold positive
Enable threshold negative
Disable threshold positive
Disable threshold negative
1.5
EN(hi)
EN(lo)
DIS(hi)
DIS(lo)
−1.5
0.4
V
V
−0.4
V
−10 V ≤ V ≤ V − 0.5 V,
IN
I
Enable pin current
0.1
2.0
µA
(EN)
−10 V ≤ V
≤ 3.5 V
(EN)
Shutdown, temperature increasing
Reset, temperature decreasing
165
145
Thermal shutdown temperature
Operating junction temperature
°C
°C
T
J
−40
125
(1)
Maximum V = V
IN OUT
+ V or − 2.7 V, whichever is more negative.
DO
3
ꢀ ꢁ ꢂꢃ ꢄ ꢅ ꢆ ꢇ
ꢄ
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢅ
ꢈ
www.ti.com
SLVS346−SEPTEMBER2003
FUNCTIONAL BLOCK DIAGRAM
TPS72301
IN
OUT
FB
EN
100 kΩ
Current Limit
/ Thermal
Protection
−
+
R1
R2
5 pF
V
ref
1.19 V
GND
R1 + R2 = 97 kW
TPS72325
OUT
IN
EN
100 kΩ
Current Limit
/ Thermal
Protection
−
+
R1
R2
5 pF
V
ref
1.19 V
GND
R1 + R2 = 97 kW
NR
Terminal Functions
TERMINAL
NAME
DESCRIPTION
NO.
1
GND
VIN
EN
Ground
Unregulatedinput supply
2
3
Bipolar enable pin. Driving this pin above the positive enable threshold or below the negative enable threshold turns
on the regulator. Driving this pin below the positive disable threshold and above the negative disable threshold puts
the regulator into shutdown mode.
NR
FB
4
4
5
Fixed voltage versions only. Connecting an external capacitor between this pin and ground, bypasses noise
generatedby the internal bandgap. This allows output noise to be reduced to very low levels.
Adjustablevoltage version only. This is the input to the control loop error amplifier. It is used to set the output voltage
of the device
VOUT
Regulated output voltage. A small 2.2 µF ceramic capacitor is needed from this pin to GND to ensure stability.
4
ꢀꢁ ꢂ ꢃꢄ ꢅꢆ ꢇ
ꢀꢁ ꢂ ꢃꢄ ꢅꢄ ꢈ
www.ti.com
SLVS346−SEPTEMBER 2003
TYPICAL CHARACTERISTICS
(TPS72325V = V
IN OUT(nom)
− 0.5 V, I
OUT
= 1 mA, V
(EN)
= 1.5 V, C
OUT
= 2.2 µF, C = 0.01 µF unless otherwise noted)
(NR)
OUTPUT VOLTAGE
vs
OUTPUT VOLTAGE
vs
OUTPUT VOLTAGE
vs
INPUT VOLTAGE
AMBIENT TEMPERATURE
OUTPUT CURRENT
−2.475
−2.488
−2.500
−2.475
−2.475
V
= 3 V,
I
I
= 200 mA
O
−2.488
−2.500
−2.488
−2.500
T
J
= 25°C
T
J
= 125°C
T
J
= 25°C
V
I
= 10 V,
= 200 mA
I
O
T
J
= −40°C
V
I
= 10 V,
= 0
I
O
T
J
= 85°C
T
J
= −40°C
−2.513
−2.525
−2.513
−2.525
−2.513
−2.525
T
J
= 125°C
V
= 3 V,
I
I
= 0
O
−10 −9 −8 −7 −6 −5 −4 −3 −2
−40 −20
0
20 40 60 80 100 120 140
0
50
100
150
200
V
− Input Voltage − V
T
A
− Ambient Temperature − °C
I
− Output Current − mA
IN
OUT
Figure 1
Figure 2
Figure 3
TPS72301
TPS72325
DROPOUT VOLTAGE
vs
INPUT VOLTAGE
DROPOUT VOLTAGE
vs
OUTPUT CURRENT
DROPOUT VOLTAGE
vs
AMBIENT TEMPERATURE
350
300
250
200
150
100
50
350
300
250
200
150
100
350
300
250
200
150
100
T
J
= 125°C
T
= 125°C
J
T
J
= 25°C
T
J
= 25°C
T
J
= −40°C
T = −40°C
J
50
0
50
0
0
0
−10 −9 −8 −7 −6 −5 −4 −3 −2
25 50 75 100 125 150 175 200
−40 −20
0
20 40 60 80 100 120 140
I
− Output Current − mA
V
− Input Voltage − V
OUT
T
A
− Ambient Temperature − °C
IN
Figure 6
Figure 4
Figure 5
GROUND CURRENT
vs
OUTPUT CURRENT
GROUND CURRENT
vs
AMBIENT TEMPERATURE
GROUND CURRENT
vs
INPUT VOLTAGE
400
350
300
250
500
450
400
350
300
500
450
400
350
300
250
200
150
100
50
T
J
= 25°C
R
L
= 12.5 Ω
V = 10 V, I = 200 mA
I O
T
= 125°C
J
250
200
150
100
200
150
100
50
T
J
= −40°C
V = 3 V, I = 0
I O
No,Loads
V
= 10 V, I = 0
O
I
50
0
0
0
0
−40 −20
0
20 40 60 80 100 120 140
50
100
150
200
−10 −9 −8 −7 −6 −5 −4 −3 −2 −1
0
T
A
− Ambient Temperature − °C
I
− Output Current − mA
OUT
V
− Input Voltage − V
IN
Figure 7
Figure 8
Figure 9
5
ꢀ ꢁ ꢂꢃ ꢄ ꢅ ꢆ ꢇ
ꢄ
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢅ
ꢈ
www.ti.com
SLVS346−SEPTEMBER2003
TPS72325
TPS72301
STANDBY CURRENT
vs
AMBIENT TEMPERATURE
CURRENT LIMIT
vs
AMBIENT TEMPERATURE
FEEDBACK PIN CURRENT
vs
AMBIENT TEMPERATURE
250
200
150
100
200
800
750
700
0
V
= −2.5 V
= −1.2 V
OUT
OUT
−200
−400
−600
650
600
550
V
= −10 V
IN
−800
V
= −3 V
V
IN
−1000
−1200
−1400
−1600
−1800
−2000
500
450
400
50
0
350
300
−40 −20
0
20 40 60 80 100 120 140
−40 −20
0
20 40 60 80 100 120 140
−40 −20
0
20 40 60 80 100 120 140
T
A
− Ambient Temperature − °C
T − Ambient Temperature − °C
A
T
A
− Ambient Temperature − °C
Figure 10
Figure 11
Figure 12
TPS72301
LINE AND LOAD REGULATION
vs
AMBIENT TEMPERATURE
ENABLE PIN CURRENT
vs
AMBIENT TEMPERATURE
MINIMUM REQUIRED INPUT VOLTAGE
vs
OUTPUT VOLTAGE
−2
0.25
0.13
1000
800
600
400
200
−3
T
J
= −40°C
−4
−5
Load
Line
V
= −10 V, V
−0.5 V
(EN)
IN
−6
0
−0.13
−0.25
0
−200
−7
T
J
= 125°C
V
= −10 V, V
= 3.5 V
(EN)
IN
−400
−600
−8
V
= −10 V, V = −10 V
(EN)
IN
−9
−800
−1000
−10
−40 −20
0
20 40 60 80 100 120 140
−40 −20
20 40 60 80 100 120 140
0
−10 −9 −8 −7 −6 −5 −4 −3 −2
T
A
− Ambient Temperature − °C
T
A
− Ambient Temperature − °C
V
− Input Voltage − V
IN
Figure 13
Figure 14
Figure 15
TPS72325
TPS72325
TPS72325
LINE TRANSIENT RESPONSE
LOAD TRANSIENT RESPONSE
LOAD TRANSIENT RESPONSE
100
100
C
C
C
= 2.2 µF
= 2.2 µF
C
C
C
= 2.2 µF
= 2.2 µF
IN
OUT
IN
OUT
50
= 0 µF
= 0 µF
byp
byp
0
−50
0
0
C
C
C
= 2.2 µF
IN
= 2.2 µF
OUT
0
= 0 µF
byp
−3.0
0
0
−100
−200
−3.5
−4.0
−4.5
−100
−200
0
20 40 60 80 100 120 140 160 180 200
t − Time − µs
0
20 40 60 80 100 120 140160 180 200
0
20 40 60 80 100 120 140160 180 200
t − Time − µs
t − Time − µs
Figure 18
Figure 16
Figure 17
6
ꢀꢁ ꢂ ꢃꢄ ꢅꢆ ꢇ
ꢀꢁ ꢂ ꢃꢄ ꢅꢄ ꢈ
www.ti.com
SLVS346−SEPTEMBER2003
TPS72325
TPS72325
START-UP RESPONSE
TPS72325
POWERUP-POWERDOWN
START-UP RESPONSE
C
C
= 2.2 µF,
= 2.2 µF,
= 50 mA,
= 0 µF
IN
OUT
0
C
= 2.2 µF,
IN
0 V
C
OUT
= 2.2 µF,
= 50 mA,
= 0 µF
I
OUT
1
2
0
1
2
3
I
OUT
C
byp
C
byp
C
C
= 2.2 µF,
= 2.2 µF,
= 50 mA,
= 0.01 µF
IN
OUT
I
OUT
C
byp
−3.5 V
0
1
2
3
4
5
6
7
8
9
10
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
1
t − Time − ms
0
0.1 0. 0.3 0.4 0.5 0.6 0.7 0.8 0.9
1
t − Time − ms
2
t − Time − ms
Figure 20
Figure 21
Figure 19
TPS72325
OUTPUT NOISE
vs
TPS72325
TPS72325
TOTAL NOISE
vs
NOISE SPECTRAL DENSITY
vs
C
(10 Hz − 100 kHz)
(NR)
TIME
FREQUENCY
250
200
150
100
10µ
1µ
C
−2.2 µF
C
= 2.2 µF,
= 100 mA
IN
OUT
C
C
−2.2 µF, C
= 2.2 µF,
= 100 mA
OUT
I
= 25 µA
IN
OUT
OUT
I
OUT
= 0.01 µF, I
byp
C
I
= 10 µF,
OUT
= 100 mA
OUT
I
= 100 mA
OUT
C
= 2.2 µF,
OUT
= 25 µA
I
OUT
C
I
= 10 µF,
OUT
= 25 µA
OUT
100 n
10 n
C
C
C
= 0.01 µF ,
IN
50
0
= 2.2 µF,
OUT
= 0.01 µF,
byp
1
10
100
1 k
− pF
10 k
100 k
100
1 k
10 k
100 k
t − Time −1 ms / div
C
(NR)
f − Frequency − Hz
Figure 22
Figure 23
Figure 24
TPS72325
NOISE SPECTRAL DENSITY
POWER SUPPLY REJECTION RATIO
POWER SUPPLY REJECTION RATIO
vs
vs
vs
FREQUENCY
FREQUENCY
FREQUENCY
90
90
10µ
1µ
80
70
60
50
80
70
60
50
I
= 1 mA
OUT
I
= 100 mA
OUT
I
= 100 mA
OUT
I
= 100 mA
OUT
I
= 1 mA
OUT
40
30
40
30
100 n
I
= 25 µA
OUT
20
10
20
10
V
= −5 V,
= 10 µF,
V
= −5 V,
IN
IN
IN
C
C
C
= 0 µF,
I
= 200 mA
IN
C
C
C
C
C
C
= 10 µF,
OUT
IN
OUT
I
= 200 mA
OUT
= 2.2 µF,
= 0.01 µF,
= 10 µF,
= 10 µF,
= 0.01
0
0
OUT
byp
OUT
byp
= 0
byp
−10
10
−10
10
10 n
100
100
1 k
10 k 100 k 1 M
100
1 k
10 k 100 k 1 M
1 k
10 k
100 k
f − Frequency − Hz
f − Frequency − Hz
f − Frequency − Hz
Figure 25
Figure 26
Figure 27
7
ꢀ ꢁ ꢂꢃ ꢄ ꢅ ꢆ ꢇ
ꢄ
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢅ
ꢈ
www.ti.com
SLVS346−SEPTEMBER2003
APPLICATION INFORMATION
DEVICE OPERATION
CAPACITOR SELECTION FOR STABILITY
Appropriate input and output capacitors should be used for
the intended application. The TPS723xx only requires a
2.2-µF ceramic output capacitor to be used for stable
operation. Both the capacitor value and ESR affect
stability, output noise, PSRR, and transient response. For
typical applications, a 2.2-µF ceramic output capacitor
located close to the regulator is sufficient.
The TPS723xx is a low-dropout negative linear voltage
regulator with a rated current of 200 mA. It is offered in
trimmed output voltages between −1.5 V and −5.2 V and
as an adjustable regulator from −1.2 V to −10 V. It features
very low noise and high PSRR making it ideal for high
sensitivity analog and RF applications. A shutdown mode
is available, reducing ground current to 2 µA maximum
over temperature and process. The TPS723xx is offered
in a small SOT23 package and is specified over a −40°C
to 125°C temperature range.
OUTPUT NOISE
Without external bypassing, output noise of the TPS723xx
from 10 Hz to 100 kHz is 200 µV
typical. The dominant
contributor to output noise is the internal bandgap
RMS
reference. Adding an external 0.01-µF capacitor to ground
ENABLE
reduces noise to 60 µV
. Best noise performance is
RMS
achieved using appropriate low ESR capacitors for
bypassing noise at the NR and VOUT pins. See the Noise
The enable pin is active above 1.5 V and below −1.5 V,
allowing it to be controlled by a standard TTL signal or by
vs C
plot in the Typical Characteristics section.
OUT
connection to V if not used. When driven to GND most
I
internal circuitry is turned off, putting the TPS723xx into
POWER SUPPLY REJECTION
shutdown mode, drawing 2 µA maximum ground current.
The TPS723xx offers a very high power supply rejection
ratio (PSRR) for applications with noisy input sources or
highly sensitive output supply lines. For best PSRR, use
high quality input and output capacitors.
ADJUSTABLE VOLTAGE APPLICATIONS
The TPS72301 allows designers to specify any output
voltage from −10 V to −1.2 V. As shown in the application
circuit in Figure 28, an external resistor divider is used to
CURRENT LIMIT
The TPS723xx has internal circuitry that monitors and
limits output current to protect the regulator from damage
under all load conditions. When output current reaches the
output current limit (550 mA typical), protection circuitry
turns on, reducing output voltage to ensure current does
not increase. See Current Limit in the Typical
Characteristics section.
scale the output voltage V to the reference voltage
O
1.186 V. For best accuracy, use precision resistors for R1
and R2.
R1
R2
+ 1.186 ǒ1 ) Ǔ
V
O
THERMAL PROTECTION
5
4
2
3
IN
OUT
FB
As protection from damage due to excessive junction
temperatures, the TPS723xx has internal protection
R1
R2
EN
circuitry.
When
junction
temperature
reaches
GND
approximately 165°C, the output device is turned off. After
the device has cooled by about 20°C, the output device is
enabled, allowing normal operation. For reliable operation,
design is for worst case junction temperature of ≤ 125°C
taking into account worst case ambient temperature and
load conditions.
1
Figure 28. TPS72301 Adjustable LDO Regulator
Programming
8
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,
enhancements, improvements, and other changes to its products and services at any time and to discontinue
any product or service without notice. Customers should obtain the latest relevant information before placing
orders and should verify that such information is current and complete. All products are sold subject to TI’s terms
and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI
deems necessary to support this warranty. Except where mandated by government requirements, testing of all
parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for
their products and applications using TI components. To minimize the risks associated with customer products
and applications, customers should provide adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,
copyright, maskworkright, orotherTIintellectualpropertyrightrelatingtoanycombination, machine, orprocess
in which TI products or services are used. Information published by TI regarding third-party products or services
does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.
Use of such information may require a license from a third party under the patents or other intellectual property
of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of information in TI data books or data sheets is permissible only if reproduction is without
alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction
of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for
such altered documentation.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that
product or service voids all express and any implied warranties for the associated TI product or service and
is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.
Following are URLs where you can obtain information on other Texas Instruments products and application
solutions:
Products
Applications
Audio
Amplifiers
amplifier.ti.com
www.ti.com/audio
Data Converters
dataconverter.ti.com
Automotive
www.ti.com/automotive
DSP
dsp.ti.com
Broadband
Digital Control
Military
www.ti.com/broadband
www.ti.com/digitalcontrol
www.ti.com/military
Interface
Logic
interface.ti.com
logic.ti.com
Power Mgmt
Microcontrollers
power.ti.com
Optical Networking
Security
www.ti.com/opticalnetwork
www.ti.com/security
www.ti.com/telephony
www.ti.com/video
microcontroller.ti.com
Telephony
Video & Imaging
Wireless
www.ti.com/wireless
Mailing Address:
Texas Instruments
Post Office Box 655303 Dallas, Texas 75265
Copyright 2003, Texas Instruments Incorporated
相关型号：
TPS72301DDCR
200-mA, negative, adjustable low-dropout voltage regulator with enable 5-SOT-23-THIN -40 to 125
TI
©2020 ICPDF网 联系我们和版权申明