TPS76427DBVR [TI]
LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS; 低功耗低噪声150 mA低压降线性稳压器
| 型号： | TPS76427DBVR |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS |
| 文件： | 总15页 (文件大小：237K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TPS76425, TPS76427, TPS76428, TPS76430, TPS76433
LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS
SLVS180A – MARCH 1999 – REVISED JUNE 1999
DBV PACKAGE
(TOP VIEW)
150-mA Low Noise, Low-Dropout Regulator
Output Voltage: 2.5 V, 2.7 V, 2.8 V, 3.0 V, 3.3 V
Output Noise Typically 50 µV
1
2
3
5
OUT
IN
Quiescent Current Typically 85 µA
GND
Dropout Voltage, Typically 300 mV
at 150 mA
4
BYPASS
EN
Thermal Protection
Over Current Limitation
Less Than 2-µA Quiescent Current in
Shutdown Mode
–40°C to 125°C Operating Junction
Temperature Range
5-Pin SOT-23 (DBV) Package
description
The TPS764xx family of low-dropout (LDO) voltage regulators offers the benefits of a low noise, low-dropout
voltage, low-power operation, and miniaturized package. Additionally, they feature low quiescent current when
compared to conventional LDO regulators. Offered in 5-terminal small outline integrated-circuit SOT-23
package, the TPS764xx series devices are ideal for low-noise applications, cost-sensitive designs and
applications where board space is at a premium.
A combination of new circuit design and process innovation has enabled the usual pnp pass transistor to be
replaced by a PMOS pass element. Because the PMOS pass element behaves as a low-value resistor, the
dropout voltage is very low—typically 300 mV at 150 mA of load current (TPS76433)—and is directly
proportional to the load current. Since the PMOS pass element is a voltage-driven device, the quiescent current
is very low (140 µA maximum) and is stable over the entire range of output load current (0 mA to 150 mA).
Intended for use in portable systems such as laptops and cellular phones, the low-dropout voltage feature and
low-power operation result in a significant increase in system battery operating life.
The TPS764xx also features a logic-enabled sleep mode to shut down the regulator, reducing quiescent current
to 1 µA maximum at T = 25°C.The TPS764xx is offered in 2.5-V, 2.7-V, 2.8-V, 3.0-V, and 3.3-V fixed-voltages.
J
AVAILABLE OPTIONS
T
VOLTAGE
2.5 V
PACKAGE
PART NUMBER
SYMBOL
PBJI
J
†
†
†
†
†
‡
‡
‡
‡
‡
TPS76425DBVT
TPS76427DBVT
TPS76428DBVT
TPS76430DBVT
TPS76433DBVT
TPS76425DBVR
TPS76427DBVR
TPS76428DBVR
TPS76430DBVR
TPS76433DBVR
2.7 V
PBKI
SOT-23
(DBV)
–40°C to 125°C
2.8 V
PCEI
3.0 V
PBLI
3.3 V
PBMI
†
‡
The DBVT passive indicates tape and reel of 250 parts.
The DBVR passive indicates tape and reel of 3000 parts.
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.
Copyright 1999, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76425, TPS76427, TPS76428, TPS76430, TPS76433
LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS
SLVS180A – MARCH 1999 – REVISED JUNE 1999
functional block diagram
TPS76425/ 27/ 28/ 30/ 33
OUT
IN
EN
Current Limit
/ Thermal
BYPASS
Protection
V
REF
GND
Terminal Functions
TERMINAL
NAME
I/O
DESCRIPTION
GND
Ground
Enable input
EN
I
BYPASS
IN
Output bypass capacitor
Input supply voltage
I
OUT
O
Regulated output voltage
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76425, TPS76427, TPS76428, TPS76430, TPS76433
LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS
SLVS180A – MARCH 1999 – REVISED JUNE 1999
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Input voltage range
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 10 V
Voltage range at EN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to V + 0.3 V
I
Voltage on OUT, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Peak output current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally limited
ESD rating, HBM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 kV
Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See dissipation rating tables
Operating virtual junction temperature range, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to 150°C
J
Storage temperature range, T
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
stg
†
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.
NOTE 1: All voltage values are with respect to network ground terminal.
DISSIPATION RATING TABLE
≤ 25°C DERATING FACTOR
T
A
T
= 70°C
T = 85°C
A
A
PACKAGE
POWER RATING
ABOVE T = 25°C
POWER RATING POWER RATING
A
Recommended
Maximum
DBV
DBV
350 mW
3.5 mW/°C
3.5 mW/°C
192 mW
280 mW
140 mW
227 mW
437 mW
recommended operating conditions
MIN NOM
MAX
10
UNIT
V
†
Input voltage, V
2.7
0
I
Continuous output current, I
150
125
mA
°C
O
Operating junction temperature, T
–40
J
†
To calculate the minimum input voltage for your maximum output current, use the following equation: V
= V
+ V
O(max) DO(max load)
I(min)
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76425, TPS76427, TPS76428, TPS76430, TPS76433
LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS
SLVS180A – MARCH 1999 – REVISED JUNE 1999
electrical characteristics over recommended operating free–air temperature range, V = V
+
I
O(typ)
1 V, I = 1 mA, EN = IN, C = 4.7 µF (unless otherwise noted)
O
O
PARAMETER
TEST CONDITIONS
T = 25°C
MIN
2.45
TYP
2.5
2.5
2.5
2.5
2.7
2.7
2.7
2.7
2.8
2.8
2.8
2.8
3.0
3.0
3.0
3.0
3.3
3.3
3.3
3.3
MAX
2.55
UNIT
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
= 1 mA to 100 mA,
= 1 mA to 100 mA
= 1 mA to 150 mA,
= 1 mA to 150 mA
= 1 mA to 100 mA,
= 1 mA to 100 mA
= 1 mA to 150 mA,
= 1 mA to 150 mA
= 1 mA to 100 mA
= 1 mA to 150 mA,
= 1 mA to 150 mA,
= 1 mA to 150 mA
= 1 mA to 100 mA,
= 1 mA to 100 mA
= 1 mA to 150 mA,
= 1 mA to 150 mA
= 1 mA to 100 mA,
= 1 mA to 100 mA
= 1 mA to 150 mA,
= 1 mA to 150 mA
= 0 to 150 mA,
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
J
2.425
2.438
2.407
2.646
2.619
2.632
2.598
2.744
2.73
2.575
2.562
2.593
2.754
2.781
2.768
2.8013
2.856
2.870
2.884
2.905
3.06
TPS76425
V
V
V
V
V
T = 25°C
J
T = 25°C
J
TPS76427
TPS76428
TPS76430
TPS76433
T = 25°C
J
T = 25°C
J
V
O
Output voltage
T = 25°C
J
2.716
2.695
2.94
T = 25°C
J
2.925
2.91
3.075
3.090
3.112
3.366
3.399
3.382
3.423
T = 25°C
J
2.887
3.234
3.201
3.218
3.177
T = 25°C
J
T = 25°C
J
T = 25°C,
J
85
0.5
50
100
Quiescent current
(GND terminal current)
See Note 2
I
(Q)
I
O
= 0 to 150 mA,
See Note 2
140
1
µA
µV
EN < 0.5 V,
T = 25°C
J
Standby current
EN < 0.5 V
2
BW = 300 Hz to 50 kHz,
C = 10 µF,
o
See Note 2
V
n
Output noise voltage
T = 25°C,
J
Bypass voltage
Ripple rejection
Current limit
T = 25°C
1.192
60
V
dB
A
J
PSRR
f = 1 kHz, C = 10 µF,
T = 25°C, See Note 2
o
J
T = 25°C
J
See Note 3
0.8
1.5
NOTES: 2. Minimum IN operating voltage is 2.7 V or V
+ 1 V, whichever is greater.
O(typ)
3. Test condition includes, output voltage V =0 V and pulse duration = 10 mS.
O
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76425, TPS76427, TPS76428, TPS76430, TPS76433
LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS
SLVS180A – MARCH 1999 – REVISED JUNE 1999
electrical characteristics over recommended operating free–air temperature range,
V = V
+ 1 V, I = 1 mA, EN = IN, C = 4.7 µF (unless otherwise noted) (continued)
I
O(typ)
O
O
PARAMETER
TEST CONDITIONS
+ 1 V < V ≤ 10 V, V ≥ 3.5 V,
MIN
TYP
MAX
0.07
0.1
2
UNIT
V
V
T = 25°C
J
0.04
Output voltage line regulation (∆V /V )
(see Note 4)
O
I
I
O
O
%/V
+ 1 V < V ≤ 10 V,
V ≥ 3.5 V
I
O
I
V
V
EN high level input
EN low level input
See Note 2
See Note 2
EN = 0 V
EN = IN
1.4
1.2
IH
V
0.5
IL
–0.01
–0.01
0.2
–0.5
–0.5
I
I
EN input current
µA
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
= 0 mA,
T = 25°C
J
O
= 1 mA,
T = 25°C
3
O
J
= 50 mA,
= 50 mA
= 75 mA,
= 75 mA
= 100 mA,
= 100 mA
= 150 mA,
= 150 mA
= 0 mA,
T = 25°C
J
120
150
200
225
300
300
400
450
600
O
O
T = 25°C
J
180
240
360
O
TPS76425
mV
O
T = 25°C
J
O
O
T = 25°C
J
O
Dropout voltage
(Note 5)
O
V
DO
T = 25°C
J
0.2
3
O
= 1 mA,
T = 25°C
J
O
= 50 mA,
= 50 mA
= 75 mA,
= 75 mA
= 100 mA,
= 100 mA
= 150 mA,
= 150 mA
T = 25°C
J
100
125
166
188
250
250
333
375
500
O
O
T = 25°C
J
150
200
300
O
TPS76433
mV
O
T = 25°C
J
O
O
T = 25°C
J
O
O
NOTES: 2. Minimum IN operating voltage is 2.7 V or V
+ 1 V, whichever is greater.
O(typ)
4. If V < 2.5 V and V
imax
= 10 V, V = 3.5 V:
imin
O
V
V
V
3.5 V
O
imax
100
Line Reg. (mV)
% V
1000
If V > 2.5 V and V
imax
= 10 V, V
imin
= V + 1 V:
O
O
V
V
1
O
imax
100
O
Line Reg. (mV)
% V
1000
5. Dropout voltage is defined as the differential voltage between V and V when V drops 100 mV below the value measured with
O
i
O
V = V + 1.0 V .:
i
O
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76425, TPS76427, TPS76428, TPS76430, TPS76433
LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS
SLVS180A – MARCH 1999 – REVISED JUNE 1999
TYPICAL CHARACTERISTICS
Table of Graphs
FIGURE
vs Output current
1
2, 3, 4
5
V
V
V
Output voltage
Output noise
O
vs Free-air temperature
vs Frequency
n
vs Bypass capacitance
vs Load current
6
Output noise voltage
n
7
Z
Output impedance
Dropout voltage
vs Frequency
8
o
V
vs Free-air temperature
vs Frequency
9
DO
Ripple rejection
10
Line transient response
Load transient response
11, 13
12, 14
15, 17
16, 18
vs Output current
Compensation series resistance (CSR)
vs Added ceramic capacitance
TPS76425
TPS76425
OUTPUT VOLTAGE
vs
FREE-AIR TEMPERATURE
OUTPUT VOLTAGE
vs
OUTPUT CURRENT
2.505
2.5
2.53
2.52
2.51
2.5
V = 3.5 V
I
V = 3.5 V
I
C = C = 4.7 µF
C = C = 4.7 µF
I
O
I
O
= 25°C
T
A
2.495
2.49
I
O
= 1 mA
I
= 150 mA
2.485
2.48
2.49
O
2.48
2.47
2.475
0
30
60
90
120
150
180
–55 –35 –15
5
25
45
65
85 105 125
I
O
– Output Current – mA (Pulse Tested)
T
A
– Free-Air Temperature – °C
Figure 1
Figure 2
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76425, TPS76427, TPS76428, TPS76430, TPS76433
LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS
SLVS180A – MARCH 1999 – REVISED JUNE 1999
TYPICAL CHARACTERISTICS
TPS76425
GROUND CURRENT
vs
TPS76433
OUTPUT VOLTAGE
vs
FREE-AIR TEMPERATURE
FREE-AIR TEMPERATURE
1000
3.34
3.33
V = 4.3 V
I
V = 6 V
I
C = C = 4.7 µF
I
O
O
I
= 0 mA and 150 mA
3.32
3.31
3.3
I
O
= 1 mA
100
3.29
3.28
I
O
= 150 mA
3.27
3.26
10
–55 –35 –15
5
25
45
65
85 105 125
–55 –35 –15
5
25
45
65
85 105 125
T
A
– Free-Air Temperature – °C
T
A
– Free-Air Temperature – °C
Figure 3
Figure 4
OUTPUT NOISE
vs
FREQUENCY
OUTPUT NOISE VOLTAGE
vs
3.3
BYPASS CAPACITANCE
80
70
60
50
40
C
= 10 µF
= 150 mA
O
I
O
f = 10 Hz to 100 kHz
= 25°C
C
= 1 µF
= 1 mA
T
O
A
I
O
C
= 10 µF
= 150 mA
O
I
O
0.33
C
= 1 µF
= 150 mA
O
I
O
0.033
0
V
= 3.3 V
O
C
= 10 µF
= 1 mA
O
C
= 0.1 µF
30
20
(BYPASS)
= 25°C
I
O
T
A
100
1.1 k
10.1 k
100.1 k
–3
10
–2
10
–1
10
f – Frequency – Hz
Bypass Capacitance – µF
Figure 6
Figure 5
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76425, TPS76427, TPS76428, TPS76430, TPS76433
LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS
SLVS180A – MARCH 1999 – REVISED JUNE 1999
TYPICAL CHARACTERISTICS
OUTPUT NOISE VOLTAGE
vs
OUTPUT IMPEDANCE
vs
LOAD CURRENT
FREQUENCY
70
60
50
40
30
20
10
10
I
= 1 mA
O
1
V
C
= 2.5 V
= 10 µF
O
O
I
O
= 150 mA
f = 10 Hz to 100 kHz
= 25°C
C = C = 4.7 µF
ESR = 1 Ω
I
O
T
A
T
= 25°C
A
1
2
10
0.1
0.01
0
10
0.1
1
10
100
1000
Load Current – mA
f – Frequency – kHz
Figure 7
Figure 8
TPS76425
DROPOUT VOLTAGE
vs
TPS76425
RIPPLE REJECTION
vs
FREE-AIR TEMPERATURE
FREQUENCY
600
100
V
C
C
= 2.5 V
O
V = EN = 2.7 V
I
90
80
70
60
50
40
30
= 0.01 µF
(BYPASS)
= 10 µF
C = C = 4.7 µF
I
O
L
500
400
300
200
150 mA
I
O
= 1 mA
I
= 150 mA
O
1 mA
0 mA
20
100
0
10
0
10
100
1 k
10 k
100 k
1 M
10 M
–55 –35 –15
5
25
45
65
85 105 125
T
A
– Free-Air Temperature – °C
f – Frequency – Hz
Figure 9
Figure 10
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76425, TPS76427, TPS76428, TPS76430, TPS76433
LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS
SLVS180A – MARCH 1999 – REVISED JUNE 1999
TYPICAL CHARACTERISTICS
TPS76425
LINE TRANSIENT RESPONSE
TPS76425
LOAD TRANSIENT RESPONSE
200 mA
100 mA
0 mA
T
A
= 25°C
T
A
= 25°C
6 V
4.7 V
50 mV
0
50 mV
0
–50 mV
–50 mV
–100 mV
0
20 40 60 80 100 120 140 160 180 200
0
20 40 60 80 100 120 140 160 180 200
t – Time – µs
t – Time – µs
Figure 11
Figure 12
TPS76433
LINE TRANSIENT RESPONSE
TPS76433
LOAD TRANSIENT RESPONSE
200 mA
100 mA
T
A
= 25°C
T = 25°C
A
6 V
0
4.7 V
100 mV
50 mV
50 mV
0
0
–50 mV
–50 mV
–100 mV
–150 mV
dv
dt
1 V
10 µs
0
20 40 60 80 100 120 140 160 180 200
0
20 40 60 80 100 120 140 160 180 200
t – Time – µs
t – Time – µs
Figure 13
Figure 14
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76425, TPS76427, TPS76428, TPS76430, TPS76433
LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS
SLVS180A – MARCH 1999 – REVISED JUNE 1999
TYPICAL CHARACTERISTICS
TYPICAL REGIONS OF STABILITY
COMPENSATION SERIES RESISTANCE (CSR)
vs
TYPICAL REGIONS OF STABILITY
†
†
COMPENSATION SERIES RESISTANCE (CSR)
vs
OUTPUT CURRENT
ADDED CERAMIC CAPACITANCE
100
100
Region of Instability
Region of Instability
10
1
10
1
C
T
= 4.7 µF
= 25°C
I = 150 mA
O
A
C
= 4.7 µF
= 25°C
O
T
A
0.1
0.1
Region of Instability
Region of Instability
0.01
0.01
0
50
100
150
200
250
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
1
I
O
– Output Current – mA
Added Ceramic Capacitance – µF
Figure 15
Figure 16
TYPICAL REGIONS OF STABILITY
TYPICAL REGIONS OF STABILITY
†
†
COMPENSATION SERIES RESISTANCE (CSR)
COMPENSATION SERIES RESISTANCE (CSR)
vs
vs
OUTPUT CURRENT
ADDED CERAMIC CAPACITANCE
100
100
Region of Instability
Region of Instability
10
1
10
1
C
= 10 µF
C
= 10 µF
O
O
0.1
0.1
Region of Instability
Region of Instability
0.01
0.01
0
50
100
150
200
250
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
1
I
O
– Output Current – mA
Added Ceramic Capacitance – µF
Figure 17
Figure 18
†
CSRreferstothetotalseriesresistance, includingtheESRofthecapacitor, anyseriesresistanceaddedexternally, andPWBtraceresistance
to C
.
O
10
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76425, TPS76427, TPS76428, TPS76430, TPS76433
LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS
SLVS180A – MARCH 1999 – REVISED JUNE 1999
APPLICATION INFORMATION
The TPS764xx family of low-noise and low-dropout (LDO) regulators are optimized for use in battery-operated
equipment. They feature extremely low noise (50 µV), low dropout voltages, low quiescent current (140 µA),
and an enable input to reduce supply current to less than 2 µA when the regulator is turned off.
device operation
The TPS764xx uses a PMOS pass element to dramatically reduce both dropout voltage and supply current over
more conventional PNP-pass-element LDO designs. The PMOS pass element is a voltage-controlled device
which, unlike a PNP transistor, does not require increased drive current as output current increases. Supply
current in the TPS764xx is essentially constant from no-load to maximum load.
Current limiting and thermal protection prevent damage by excessive output current and/or power dissipation.
The device switches into a constant-current mode at approximately 1 A; further load reduces the output voltage
insteadofincreasingtheoutputcurrent. Thethermalprotectionshutstheregulatoroffifthejunctiontemperature
rises above 165°C. Recovery is automatic when the junction temperature drops approximately 25°C below the
high temperature trip point. The PMOS pass element includes a back diode that safely conducts reverse current
when the input voltage level drops below the output voltage level.
An internal resistor, in conjunction with external 0.01-µF bypass capacitor, creates a low-pass filter to further
reduce the noise. The TPS764xx exhibits only 50 µV of output voltage noise using 0.01 µF bypass and 4.7-µF
output capacitors.
A logic low on the enable input, EN, shuts off the output and reduces the supply current to less than 2 µA. EN
should be tied high in applications where the shutdown feature is not used.
A typical application circuit is shown in Figure 22.
†
TPS764xx
1
3
V
IN
I
5
4
V
OUT
O
C1
1 µF
BYPASS
+
EN
+
0.01 µF
4.7 µF
GND
2
CSR = 1 Ω
†
TPS76425, TPS76427 TPS76430, TPS76433.
Figure 19. Typical Application Circuit
11
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76425, TPS76427, TPS76428, TPS76430, TPS76433
LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS
SLVS180A – MARCH 1999 – REVISED JUNE 1999
APPLICATION INFORMATION
external capacitor requirements
Although not required, a 0.047-µF or larger ceramic bypass input capacitor, connected between IN and GND
and located close to the TPS764xx, is recommended to improve transient response and noise rejection. A
higher-value electrolytic input capacitor may be necessary if large, fast-rise-time load transients are anticipated
and the device is located several inches from the power source.
Like all low dropout regulators, the TPS764xx requires an output capacitor connected between OUT and GND
to stabilize the internal loop control. The minimum recommended capacitance value is 4.7 µF and the ESR
(equivalent series resistance) must be between 0.2 Ω and 10 Ω. Capacitor values 4.7 µF or larger are
acceptable, provided the ESR is less than 10Ω. Solidtantalumelectrolytic, aluminumelectrolytic, andmultilayer
ceramic capacitors are all suitable, provided they meet the requirements described above. Most of the
commercially available 4.7 µF surface–mount solid tantalum capacitors, including devices from Sprague,
Kemet, and Nichico, meet the ESR requirements previously stated. Multilayer ceramic capacitors should have
minimum values of 1 µF over the full operating temperature range of the equipment.
CAPACITOR SELECTION
†
†
PART NO.
T494B475K016AS
195D106x0016x2T
695D106x003562T
TPSC475K035R0600
MFR.
KEMET
SPRAGUE
SPRAGUE
AVX
VALUE
4.7 µF
10 µF
MAX ESR
SIZE (H × L × W)
1.9 × 3.5 × 2.8
1.3 × 7.0 × 2.7
2.5 × 7.6 × 2.5
2.6 × 6.0 × 3.2
1.5 Ω
1.5 Ω
10 µF
1.3 Ω
4.7 µF
0.6 Ω
†
Size is in mm. ESR is maximum resistance in ohms at 100 kHz and T = 25°C. Listings are sorted by height.
A
12
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76425, TPS76427, TPS76428, TPS76430, TPS76433
LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS
SLVS180A – MARCH 1999 – REVISED JUNE 1999
APPLICATION INFORMATION
power dissipation and junction temperature
Specified regulator operation is assured to a junction temperature of 125°C; the maximum junction temperature
allowable without damaging the device is 150°C. This restriction limits the power dissipation the regulator can
handle in any given application. To ensure the junction temperature is within acceptable limits, calculate the
maximum allowable dissipation, P
, and the actual dissipation, P , which must be less than or equal to
D(max)
D
P
.
D(max)
The maximum-power-dissipation limit is determined using the following equation:
T max
J
T
A
P
D(max)
R
JA
Where
T max is the maximum allowable junction temperature
J
R
is the thermal resistance junction-to-ambient for the package, i.e., 285°C/W for the 5-terminal
θJA
SOT23.
T is the ambient temperature.
A
The regulator dissipation is calculated using:
P
V
V
I
D
I
O
O
Power dissipation resulting from quiescent current is negligible.
regulator protection
The TPS764xx pass element has a built-in back diode that safely conducts reverse current when the input
voltage drops below the output voltage (e.g., during power down). Current is conducted from the output to the
input and is not internally limited. If extended reverse voltage is anticipated, external limiting might be
appropriate.
The TPS764xx also features internal current limiting and thermal protection. During normal operation, the
TPS764xx limits output current to approximately 800 mA. When current limiting engages, the output voltage
scales back linearly until the overcurrent condition ends. While current limiting is designed to prevent gross
device failure, care should be taken not to exceed the power dissipation ratings of the package. If the
temperature of the device exceeds 165°C, thermal-protection circuitry shuts it down. Once the device has
cooled down to below 140°C, regulator operation resumes.
13
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76425, TPS76427, TPS76428, TPS76430, TPS76433
LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS
SLVS180A – MARCH 1999 – REVISED JUNE 1999
MECHANICAL DATA
DBV (R-PDSO-G5)
PLASTIC SMALL-OUTLINE PACKAGE
0,40
0,20
M
0,25
0,95
5
4
0,15 NOM
1,80
1,50
3,00
2,50
1
3
Gage Plane
3,10
2,70
0,25
0°–8°
0,55
0,35
Seating Plane
0,10
1,30
1,00
0,05 MIN
4073253-4/B 10/97
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
C. Body dimensions include mold flash or protrusion.
14
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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Copyright 1999, Texas Instruments Incorporated
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