TPS79015, TPS79018, TPS79025, TPS79028, TPS79030
ULTRALOW-POWER LOW-NOISE 50-mA
LOW-DROPOUT LINEAR REGULATORS
SLVS299B – SEPTEMBER 2000 – REVISED MAY 2001
D
D
D
D
D
D
D
D
D
50-mA Low-Dropout Regulator
Available in 1.5-V, 1.8-V, 2.5-V, 2.8-V, 3.0-V
Output Noise Typically 56 µVRMS
(TPS79030)
Only 17 µA Quiescent Current at 50 mA
1 µA Quiescent Current in Standby Mode
Dropout Voltage Typically 57 mV at 50 mA
(TPS79030)
Over Current Limitation
–40°C to 125°C Operating Junction
Temperature Range
5-Pin SOT-23 (DBV) Package
DBV PACKAGE
(TOP VIEW)
IN
1
GND
2
EN
3
5
OUT
4
BYPASS
TPS79030
GROUND CURRENT
vs
JUNCTION TEMPERATURE
22
VI = 4 V
Co = 4.7 µF
21
The usual PNP pass transistor has been replaced
by a PMOS pass element. Because the PMOS
pass element behaves as a low-value resistor, the
dropout voltage is very low, typically 57 mV at
50 mA of load current (TPS79030), and is directly
proportional to the load current. The quiescent
current is ultralow (17 µA typically) and is stable
over the entire range of output load current (0 mA
to 50 mA). Intended for use in portable systems
such as laptops and cellular phones, the
ultralow-dropout voltage feature and ultralowpower operation result in a significant increase in
system battery operating life.
20
IO = 50 mA
19
IO = 1 mA
18
17
16
15
–40 –25 –10 5 20 35 50 65 80 95 110 125
TJ – Junction Temperature – °C
TPS78930
OUTPUT SPECTRAL NOISE DENSITY
vs
FREQUENCY
1200
Output Spectral Noise Density µ–V/ Hz
The TPS790xx family of low-dropout (LDO)
voltage regulators offers the benefits of
low-dropout voltage, ultralow-power operation,
low-output noise, and miniaturized packaging.
These regulators feature low-dropout voltages
and ultralow quiescent current compared to
conventional LDO regulators. An internal resistor,
in conjunction with an external bypass capacitor,
creates a low-pass filter to reduce the noise. The
TPS79030 exhibits only 56 µVRMS of output
voltage noise using 0.01 µF bypass and 10 µF
output capacitors. Offered in a 5-terminal small
outline integrated-circuit SOT-23 package, the
TPS790xx series devices are ideal for
micropower operations, low output noise, and
where board space is limited.
Ground Current – µ A
description
VI = 4 V
Co = 4.7 µF
C(byp) = 0.1 µF
1000
800
600
IO = 50 mA
IO = 1 mA
400
200
0
100
1k
10k
f – Frequency – Hz
100k
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 2001, 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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1
TPS79015, TPS79018, TPS79025, TPS79028, TPS79030
ULTRALOW-POWER LOW-NOISE 50-mA
LOW-DROPOUT LINEAR REGULATORS
SLVS299B – SEPTEMBER 2000 – REVISED MAY 2001
description (continued)
The TPS790xx also features a logic-enabled sleep mode to shut down the regulator, reducing quiescent current
to 1 µA typical at TJ = 25°C. The TPS790xx is offered in 1.5 V, 1.8 V, 2.5 V, 2.8 V, 3.0 V.
AVAILABLE OPTIONS
VOLTAGE
TJ
PACKAGE
PART NUMBER
TPS79015DBVT† TPS79015DBVR‡
TPS79018DBVT† TPS79018DBVR‡
TPS79025DBVT† TPS79025DBVR‡
1.5 V
1.8 V
–40°C to 125°C
2.5 V
SOT-23
SOT
23
(DBV)
TPS79028DBVT†
TPS79030DBVT†
2.8 V
3.0 V
TPS79028DBVR‡
TPS79030DBVR‡
† The DBVT indicates tape and reel of 250 parts.
‡ The DBVR indicates tape and reel of 3000 parts.
functional block diagram
TPS79015/18/25/28/30
OUT
IN
EN
150 kΩ
Current Limit
/ Thermal
Protection
Vref
GND
Bypass
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
NO.
BYPASS
4
I
Bypass
EN
3
I
Enable input
GND
2
IN
1
I
Input supply voltage
OUT
5
O
Regulated output voltage
2
Ground
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SYMBOL
PEBI
PECI
PEDI
PEEI
PEFI
TPS79015, TPS79018, TPS79025, TPS79028, TPS79030
ULTRALOW-POWER LOW-NOISE 50-mA
LOW-DROPOUT LINEAR REGULATORS
SLVS299B – SEPTEMBER 2000 – REVISED MAY 2001
detail description
The TPS790xx 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
and, unlike a PNP transistor, it does not require increased drive current as output current increases. Supply
current in the TPS790xx is essentially constant from no load to maximum load.
The TPS790xx family of low-dropout (LDO) regulators have been optimized for use in battery-operated
equipment. They feature extremely low dropout voltages, low output noise, low quiescent current (17 µA
typically), and enable inputs to reduce supply currents to 1 µA when the regulators are turned off.
The internal voltage reference is a key source of noise in a LDO regulator. The TPS790xx has a BYPASS pin
which is connected to the voltage reference through a 150-kΩ internal resistor. The 150-kΩ internal resistor,
in conjunction with an external bypass capacitor connected to the BYPASS pin, creates a low pass filter to
reduce the voltage reference noise and, therefore, the noise at the regulator output. Note that the output will
start up slower as the bypass capacitance increases due to the RC time constant at the bypass pin that is created
by the internal 150-kΩ resistor and external capacitor.
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 350 mA; further load reduces the output
voltage instead of increasing the output current. The thermal protection shuts the regulator off if the junction
temperature rises above approximately 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 gate diode
that conducts reverse current when the input voltage level drops below the output voltage level.
A voltage of 1.7 V or greater on the EN input will disable the TPS790xx internal circuitry, reducing the supply
current to 1 µA. A voltage of less than 0.9 V on the EN input will enable the TPS790xx and will enable normal
operation to resume. The EN input does not include any deliberate hysteresis, and it exhibits an actual switching
threshold of approximately 1.5 V.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)Ĕ
Input voltage range (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.3 V to 13.5 V
Voltage range at EN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to VI + 0.3 V
Voltage on OUT, FB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Peak output current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally limited
ESD rating, HBM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 kV
Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating virtual junction temperature range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 40°C to 150°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C
† 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
BOARD
PACKAGE
RθJC
RθJA
DERATING FACTOR
ABOVE TA = 25°C
TA ≤ 25°C
POWER RATING
TA = 70°C
POWER RATING
TA = 85°C
POWER RATING
Low K‡
High K§
DBV
65.8 °C/W
259 °C/W
3.9 mW/°C
386 mW
212 mW
154 mW
DBV
65.8 °C/W
180 °C/W
5.6 mW/°C
555 mW
305 mW
222 mW
‡ The JEDEC Low K (1s) board design used to derive this data was a 3 inch x 3 inch, two layer board with 2 ounce copper traces on top of the board.
§ The JEDEC High K (2s2p) board design used to derive this data was a 3 inch x 3 inch, multilayer board with 1 ounce internal power and ground
planes and 2 ounce copper traces on top and bottom of the board.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
3
TPS79015, TPS79018, TPS79025, TPS79028, TPS79030
ULTRALOW-POWER LOW-NOISE 50-mA
LOW-DROPOUT LINEAR REGULATORS
SLVS299B – SEPTEMBER 2000 – REVISED MAY 2001
recommended operating conditions
MIN
Input voltage, VI (see Note 2)
NOM
2.7
Continuous output current, IO (see Note 3)
Operating junction temperature, TJ
MAX
UNIT
10
V
0
50
mA
–40
125
°C
NOTES: 2. To calculate the minimum input voltage for your maximum output current, use the following formula:
VI(min) = VO(max) + VDO (max load)
3. Continuous output current and operating junction temperature are limited by internal protection circuitry, but it is not recommended
that the device operate under conditions beyond those specified in this table for extended periods of time.
electrical characteristics over recommended operating free–air temperature range,
VI = VO(typ) + 1 V, IO = 1 mA, EN = 0V, Co = 4.7 µF (unless otherwise noted)
PARAMETER
TEST CONDITIONS
Output voltage
µA to 50 mA load))
g (10
( µ
(see Note 4)
TPS79015
TJ = 25°C,
TJ = –40°C to 125°C,
2.7 V < VI < 10 V
TPS79018
TJ = 25°C,
TJ = –40°C to 125°C,
2.8 V < VI < 10 V
TPS79025
TJ = 25°C,
TJ = –40°C to 125°C,
3.5 V < VI < 10 V
TPS79028
TJ = 25°C,
TJ = –40°C to 125°C,
3.8 V < VI < 10 V
TPS79030
TJ = 25°C,
TJ = –40°C to 125°C,
2.7 V < VI < 10 V
2.8 V < VI < 10 V
3.5 V < VI < 10 V
Load regulation
EN = 0 V,
TJ = 25°C
IO = 10 µA to 50 mA,
Output voltage line regulation (∆VO/VO)
(see Notes 4 and 5)
VO + 1 V < VI ≤ 10 V, TJ = 25°C
VO + 1 V < VI ≤ 10 V,
TJ = –40°C to 125°C
Output noise voltage (TPS79030)
BW = 300 Hz to 50 kHz, C(byp) = 0.01 µF,
Co = 10 µF, IO = 50 mA, TJ = 25°C
VO = 0 V,
EN = VI ,
See Note 4
UNIT
1.8
1.854
2.5
2.425
2.575
V
2.8
2.910
IO = 50 mA,
MAX
1.545
1.746
4.0 V < VI < 10 V
EN = 0 V,
TJ = –40°C to 125°C
Output current limit
1.455
2.716
10 µA < IO < 50 mA,
TYP
1.5
3.8 V < VI < 10 V
4.0 V < VI < 10 V
EN = 0 V,
TJ = 25°C
Quiescent current (GND current) (see Note 4)
MIN
2.884
3
3.090
17
µA
28
8
mV
0.04
0.1
µVrms
56
350
%/V
750
mA
2.7 < VI < 10 V
1
µA
TJ = –40°C to 125°C
2
µA
NOTES: 4. The minimum IN operating voltage is 2.7 V or VO (typ) + 1 V, whichever is greater. The maximum IN voltage is 10 V. The minimum
output current is 10 µA and the maximum output current is 50 mA.
5. If VO ≤ 1.8 V then VImin = 2.7 V, VImax = 10 V:
Standby current
Line Reg. (mV)
+ ǒ%ńVǓ
V
O
ǒ
ǒ
V
Imax
Ǔ
* 2.7 V
100
If VO ≥ 2.5 V then VImin = VO + 1 V, VImax = 10 V:
Line Reg. (mV)
4
+ ǒ%ńVǓ
V
O
V
Imax
*
ǒ
V
100
O
1000
ǓǓ
)1 V
POST OFFICE BOX 655303
1000
• DALLAS, TEXAS 75265
TPS79015, TPS79018, TPS79025, TPS79028, TPS79030
ULTRALOW-POWER LOW-NOISE 50-mA
LOW-DROPOUT LINEAR REGULATORS
SLVS299B – SEPTEMBER 2000 – REVISED MAY 2001
electrical characteristics over recommended operating free–air temperature range,
VI = VO(typ) + 1 V, IO = 1 mA, EN = 0V, Co = 4.7 µF (unless otherwise noted) (continued)
PARAMETER
TEST CONDITIONS
High level enable input voltage
2.7 V < VI < 10 V
Low level enable input voltage
2.7 V < VI < 10 V
Power supply ripple rejection (TPS79030)
f = 1 kHz,
TJ = 25°C,
Input current (EN)
Dropout voltage (see Note 6)
Dropout voltage (see Note 6)
MIN
TYP
MAX
UNIT
1.7
V
0.9
Co = 10 µF,
C(byp) = 0.01 µF
V
85
EN = 0 V
–1
EN = VI
–1
0
TPS79028
IO = 50 mA,
IO = 50 mA,
TJ = 25°C
TJ = –40°C to 125°C
60
TPS79030
IO = 50 mA,
IO = 50 mA,
TJ = 25°C
TJ = –40°C to 125°C
57
dB
1
µA
1
µA
125
mV
115
6. IN voltage equals VO(typ) –100 mV; The TPS79030 output voltage is set to 2.9 V. The TPS79015, TPS79018, and TPS79025
dropout voltage is limited by input voltage range limitations.
TYPICAL CHARACTERISTICS
Table of Graphs
FIGURE
VO
Zo
VDO
VO
Output voltage
vs Output current
1, 2, 3
vs Junction temperature
4, 5, 6
Ground current
vs Junction temperature
Output spectral noise density
vs Frequency
Root mean squared output noise
vs Bypass capacitance
11
Output impedance
vs Frequency
12
Dropout voltage
vs Junction temperature
13
Ripple rejection
vs Frequency
14 – 16
Output voltage, enable voltage
vs Time (start-up)
17 – 19
Line transient response
7
8 – 10
20, 22
Load transient response
21, 23
Equivalent series resistance (ESR)
POST OFFICE BOX 655303
vs Output current
• DALLAS, TEXAS 75265
24, 25
5
TPS79015, TPS79018, TPS79025, TPS79028, TPS79030
ULTRALOW-POWER LOW-NOISE 50-mA
LOW-DROPOUT LINEAR REGULATORS
SLVS299B – SEPTEMBER 2000 – REVISED MAY 2001
TYPICAL CHARACTERISTICS
TPS79015
TPS79025
OUTPUT VOLTAGE
vs
OUTPUT CURRENT
OUTPUT VOLTAGE
vs
OUTPUT CURRENT
1.515
2.545
VI = 3.5 V
Co = 4.7 µF
TJ = 25°C
1.510
VO – Output Voltage – V
VO – Output Voltage – V
2.510
VI = 2.7 V
Co = 4.7 µF
TJ = 25°C
2.505
2.500
2.495
1.505
1.500
1.495
1.490
2.490
1.485
2.485
0
20
10
40
30
0
50
10
20
Figure 1
TPS79030
TPS79015
OUTPUT VOLTAGE
vs
OUTPUT CURRENT
OUTPUT VOLTAGE
vs
JUNCTION TEMPERATURE
50
1.515
VI = 2.7 V
Co = 4.7 µF
VI = 4 V
Co = 4.7 µF
TJ = 25°C
1.510
VO – Output Voltage – V
3.010
VO – Output Voltage – V
40
Figure 2
3.015
3.005
3.000
2.995
2.990
1.505
IO = 1 mA
1.500
IO = 50 mA
1.495
1.490
2.985
0
10
20
30
40
IO – Output Current – mA
50
1.485
–40 –25 –10
5
20
35
50
Figure 4
POST OFFICE BOX 655303
65 80
95 110 125
TJ – Junction Temperature – °C
Figure 3
6
30
IO – Output Current – mA
IO – Output Current – mA
• DALLAS, TEXAS 75265
TPS79015, TPS79018, TPS79025, TPS79028, TPS79030
ULTRALOW-POWER LOW-NOISE 50-mA
LOW-DROPOUT LINEAR REGULATORS
SLVS299B – SEPTEMBER 2000 – REVISED MAY 2001
TYPICAL CHARACTERISTICS
TPS79025
TPS79030
OUTPUT VOLTAGE
vs
JUNCTION TEMPERATURE
OUTPUT VOLTAGE
vs
JUNCTION TEMPERATURE
2.515
3.015
VI = 3.5 V
Co = 4.7 µF
VI = 4 V
Co = 4.7 µF
3.010
IO = 1 mA
2.505
VO – Output Voltage – V
VO – Output Voltage – V
2.510
2.500
IO = 50 mA
2.495
2.490
3.005
IO = 1 mA
3.000
2.995
IO = 50 mA
2.990
2.485
–40 –25 –10
5
20
35
50
65 80
2.985
–40 –25 –10 5
95 110 125
20
TPS79030
65
80
95 110 125
TPS79030
GROUND CURRENT
vs
JUNCTION TEMPERATURE
OUTPUT SPECTRAL NOISE DENSITY
vs
FREQUENCY
22
1200
VI = 4 V
Co = 4.7 µF
Output Spectral Noise Density – nV/ Hz
Ground Current – µ A
50
Figure 6
Figure 5
21
35
TJ – Junction Temperature – °C
TJ – Junction Temperature – °C
20
IO = 50 mA
19
IO = 1 mA
18
17
16
15
–40 –25 –10
5
20
35
50
65 80
95 110 125
VI = 4 V
Co = 4.7 µF
C(byp) = 0.1 µF
1000
800
600
IO = 50 mA
IO = 1 mA
400
200
0
100
TJ – Junction Temperature – °C
1k
10k
100k
f – Frequency – Hz
Figure 8
Figure 7
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
7
TPS79015, TPS79018, TPS79025, TPS79028, TPS79030
ULTRALOW-POWER LOW-NOISE 50-mA
LOW-DROPOUT LINEAR REGULATORS
SLVS299B – SEPTEMBER 2000 – REVISED MAY 2001
TYPICAL CHARACTERISTICS
TPS79030
TPS79030
OUTPUT SPECTRAL NOISE DENSITY
vs
FREQUENCY
OUTPUT SPECTRAL NOISE DENSITY
vs
FREQUENCY
1800
VI = 4 V
Co = 10 µF
C(byp) = 0.1 µF
600
Output Spectral Noise Density – nV/ Hz
Output Spectral Noise Density – nV/
Hz
700
500
400
IO = 1 mA
300
IO = 50 mA
200
100
1400
C(byp) = 0.01 µF
1200
C(byp) = 0.1 µF
1000
800
600
400
200
0
100
1k
10k
0
100
100k
1k
10k
f – Frequency – Hz
f – Frequency – Hz
Figure 9
OUTPUT IMPEDANCE
vs
FREQUENCY
300
2
Co = 10 µF
1.8
250
VI = 4 V
Co = 10 µF
TJ = 25°C
1.6
Zo – Output Impedance – Ω
RMS – Root Mean Squared Output Noise – µ V(RMS)
100k
Figure 10
ROOT MEAN SQUARED OUTPUT NOISE
vs
BYPASS CAPACITANCE
200
150
100
VO = 3 V
1.2
1
0.8
IO = 1 mA
0.6
0.4
50
IO = 50 mA
0.2
VO = 1.5 V
0
0.00001
1.4
0.1
0.0001
0.001
0.01
C(bypass) – Bypass Capacitance – µF
1
0
10
100
1k
10k
f – Frequency – Hz
Figure 11
8
VI = 4 V
IO = 50 mA
Co = 10 µF
C(byp) = 0.001 µF
1600
Figure 12
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
100k
1M
TPS79015, TPS79018, TPS79025, TPS79028, TPS79030
ULTRALOW-POWER LOW-NOISE 50-mA
LOW-DROPOUT LINEAR REGULATORS
SLVS299B – SEPTEMBER 2000 – REVISED MAY 2001
TYPICAL CHARACTERISTICS
TPS79030
TPS79030
DROPOUT VOLTAGE
vs
JUNCTION TEMPERATURE
RIPPLE REJECTION
vs
FREQUENCY
110
75
100
IO = 50 mA
IO = 1 mA
90
Ripple Rejection –dB
VDO – Dropout Voltage – mV
65
VI = 2.9 V
Co = 4.7 µF
55
45
35
80
70
IO = 50 mA
60
50
25
40
IO = 1 mA
15
5
–40 –25 –10
VI = 4 V
Co = 4.7 µF
C(byp) = 0.1 µF
30
20
5
20
35
50
65 80
95 110 125
10
100
TA – Junction Temperature – °C
1k
100k
1M
100k
1M
Figure 14
Figure 13
TPS79030
TPS79030
RIPPLE REJECTION
vs
FREQUENCY
RIPPLE REJECTION
vs
FREQUENCY
100
100
90
90
IO = 1 mA
80
Ripple Rejection –dB
Ripple Rejection –dB
10k
f – Frequency – Hz
70
IO = 50 mA
60
50
40
IO = 1 mA
80
70
IO = 50 mA
60
50
40
VI = 4 V
Co = 4.7 µF
C(byp) = 0.01 µF
30
VI = 4 V
Co = 4.7 µF
C(byp) = 0.001 µF
30
20
20
10
100
1k
10k
f – Frequency – Hz
100k
1M
10
100
1k
10k
f – Frequency – Hz
Figure 15
Figure 16
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
9
TPS79015, TPS79018, TPS79025, TPS79028, TPS79030
ULTRALOW-POWER LOW-NOISE 50-mA
LOW-DROPOUT LINEAR REGULATORS
SLVS299B – SEPTEMBER 2000 – REVISED MAY 2001
TYPICAL CHARACTERISTICS
TPS79030
Enable Voltage – V
OUTPUT VOLTAGE, ENABLE VOLTAGE
vs
TIME (START-UP)
5
0
VO – Output Voltage – V
3
2
VI = 4 V
VO = 3 V
IO = 50 mA
C(byp) = 0.01 µF
VI = 4 V
Co = 4.7 µF
C = 4.7 µF
TJ = 25°CO
1
0
0
1
2
3
4
5
6
t – Time – ms
7
8
9
10
TPS79030
OUTPUT VOLTAGE, ENABLE VOLTAGE
vs
TIME (START-UP)
Enable Voltage – V
TPS79030
OUTPUT VOLTAGE, ENABLE VOLTAGE
vs
TIME (START-UP)
5
0
3
VO – Output Voltage – V
VO – Output Voltage – V
Enable Voltage – V
Figure 17
2
VI = 4 V
VO = 3 V
IO = 50 mA
C(byp) = 0.001 µF
Co = 4.7 µF
TJ = 25°C
1
0
0
0.2 0.4
0.6
0.8 1
1.2
t – Time – ms
1.4 1.6
1.8
2
5
0
C(byp) = 0.001 µF
C(byp) = 0.01 µF
2
VI = 4 V
VO = 3 V
IO = 50 mA
Co = 4.7 µF
TJ = 25°C
1
0
0
10
Figure 18
10
C(byp) = 0.1 µF
3
20
30
40 50 60
t – Time – ms
Figure 19
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
70
80
90 100
TPS79015, TPS79018, TPS79025, TPS79028, TPS79030
ULTRALOW-POWER LOW-NOISE 50-mA
LOW-DROPOUT LINEAR REGULATORS
SLVS299B – SEPTEMBER 2000 – REVISED MAY 2001
TPS79015
LOAD TRANSIENT RESPONSE
Current Load – mA
TPS79015
LINE TRANSIENT RESPONSE
20
0
–20
50
0
3.7
∆ VO – Change In
Output Voltage – mV
VI – Input Voltage – V
VO – Output Voltage – mV
TYPICAL CHARACTERISTICS
2.7
IO = 10 mA
Co = 4.7 µF
0
20
40
60
0
–50
VI = 2.7 V
Co = 10 µF
–100
0
80 100 120 140 160 180 200
t – Time – µs
20
40
TPS79030
LOAD TRANSIENT RESPONSE
I O – Output Current – mA
TPS79030
LINE TRANSIENT RESPONSE
IO = 10 mA
Co = 4.7 µF
5
4.5
4
50
0
50
∆ VO – Change In
Output Voltage – mV
VI – Input Voltage – V
80 100 120 140 160 180 200
t – Time – µs
Figure 21
Figure 20
VO – Output Voltage – mV
60
20
0
–20
0
20
40
60
80 100 120 140 160 180 200
t – Time – µs
0
–50
VI = 4 V
Co = 4.7 µF
–100
0
20
40
60
80 100 120 140 160 180 200
t – Time – µs
Figure 23
Figure 22
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
11
TPS79015, TPS79018, TPS79025, TPS79028, TPS79030
ULTRALOW-POWER LOW-NOISE 50-mA
LOW-DROPOUT LINEAR REGULATORS
SLVS299B – SEPTEMBER 2000 – REVISED MAY 2001
TYPICAL CHARACTERISTICS
TPS79030
TYPICAL REGIONS OF STABILITY
TPS79030
TYPICAL REGIONS OF STABILITY
EQUIVALENT SERIES RESISTANCE (ESR)
vs
OUTPUT CURRENT
EQUIVALENT SERIES RESISTANCE (ESR)
vs
OUTPUT CURRENT
100
VI = 4 V
Co = 4.7 µF
VO = 3 V
ESR – Equivalent Series Resistance – Ω
ESR – Equivalent Series Resistance – Ω
100
Region of Instability
10
1
Region of Stability
0.1
VI = 4 V
Co = 10 µF
VO = 3 V
Region of Instability
10
Region of Stability
1
0
5
10
15
20
25
30
35
40
45
50
0
5
15
20
25
Figure 25
Figure 24
POST OFFICE BOX 655303
30
35
IO – Output Current – mA
IO – Output Current – mA
12
10
• DALLAS, TEXAS 75265
40
45
50
TPS79015, TPS79018, TPS79025, TPS79028, TPS79030
ULTRALOW-POWER LOW-NOISE 50-mA
LOW-DROPOUT LINEAR REGULATORS
SLVS299B – SEPTEMBER 2000 – REVISED MAY 2001
APPLICATION INFORMATION
The TPS790xx family of low-dropout (LDO) regulators have been optimized for use in battery-operated
equipment. They feature extremely low dropout voltages, low quiescent current (17 µA typically), and enable
inputs to reduce supply currents to less than 1 µA when the regulators are turned off.
A typical application circuit is shown in Figure 26.
TPS790xx†
1
VI
IN
BYPASS 4
OUT
C1
1 µF
5
VO
3
EN
+
GND
0.01 µF
4.7 µF
ESR = 0.2 Ω
2
Figure 26. Typical Application Circuit
external capacitor requirements
Although not required, a 0.047-µF or larger ceramic input bypass capacitor, connected between IN and GND
and located close to the TPS790xx, 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 TPS790xx requires an output capacitor connected between OUT and GND
to stabilize the internal control loop. The minimum recommended capacitance is 4.7 µF. The ESR (equivalent
series resistance) of the capacitor should be between 0.2 Ω and 10 Ω to ensure stability. Capacitor values larger
than 4.7 µF are acceptable, and allow the use of smaller ESR values. Capacitances less than 4.7 µF are not
recommended because they require careful selection of ESR to ensure stability. Solid tantalum electrolytic,
aluminum electrolytic, and multilayer 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 stated above. Multilayer ceramic
capacitors may have very small equivalent series resistances and may thus require the addition of a low value
series resistor to ensure stability.
CAPACITOR SELECTION
PART NO.
MAX ESR†
SIZE (H × L × W)†
MFR.
VALUE
T494B475K016AS
KEMET
4.7 µF
1.5 Ω
1.9 × 3.5 × 2.8
195D106x0016x2T
SPRAGUE
10 µF
1.5 Ω
1.3 × 7.0 × 2.7
695D106x003562T
SPRAGUE
10 µF
1.3 Ω
2.5 × 7.6 × 2.5
TPSC475K035R0600
AVX
4.7 µF
0.6 Ω
2.6 × 6.0 × 3.2
† Size is in mm. The ESR maximum resistance is in Ohms at 100 kHz and TA = 25°C. Contact the
manufacturer for the minimum ESR values.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
13
TPS79015, TPS79018, TPS79025, TPS79028, TPS79030
ULTRALOW-POWER LOW-NOISE 50-mA
LOW-DROPOUT LINEAR REGULATORS
SLVS299B – SEPTEMBER 2000 – REVISED MAY 2001
APPLICATION INFORMATION
external capacitor requirements (continued)
The external bypass capacitor, used in conjunction with an internal resistor to form a low-pass filter, should be
a low ESR ceramic capacitor. For example, the TPS79030 exhibits only 56 µVRMS of output voltage noise using
a 0.01 µF ceramic bypass capacitor and a10 µF ceramic output capacitors. Note that the output will start up
slower as the bypass capacitance increases due to the RC time constant at the bypass pin that is created by
the internal 150 kΩ resistor and external capacitor.
power dissipation and junction temperature
Specified regulator operation is assured to a junction temperature of 125°C; the maximum junction temperature
should be restricted to 125°C under normal operating conditions. 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, PD(max), and the actual dissipation, PD, which must be less than
or equal to PD(max).
The maximum-power-dissipation limit is determined using the following equation:
P
D(max)
* TA
+ TJmax
R
qJA
Where:
TJmax is the maximum allowable junction temperature.
RθJA is the thermal resistance junction-to-ambient for the package, see the dissipation rating table.
TA is the ambient temperature.
ǒ
Ǔ
The regulator dissipation is calculated using:
P
D
+ VI * VO
I
O
Power dissipation resulting from quiescent current is negligible. Excessive power dissipation will trigger the
thermal protection circuit.
regulator protection
The TPS790xx PMOS-pass transistor has a built-in back diode that 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 operation is anticipated, external limiting might
be appropriate.
The TPS790xx features internal current limiting and thermal protection. During normal operation, the TPS790xx
limits output current to approximately 350 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 approximately 165°C, thermal-protection circuitry shuts it down. Once the device has cooled down to
below approximately 140°C, regulator operation resumes.
14
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
TPS79015, TPS79018, TPS79025, TPS79028, TPS79030
ULTRALOW-POWER LOW-NOISE 50-mA
LOW-DROPOUT LINEAR REGULATORS
SLVS299B – SEPTEMBER 2000 – REVISED MAY 2001
MECHANICAL DATA
DBV (R-PDSO-G5)
PLASTIC SMALL-OUTLINE
0,50
0,30
0,95
5
0,20 M
4
1,70
1,50
1
0,15 NOM
3,00
2,60
3
Gage Plane
3,00
2,80
0,25
0°–8°
0,55
0,35
Seating Plane
1,45
0,95
0,05 MIN
0,10
4073253-4/F 10/00
NOTES: A.
B.
C.
D.
All linear dimensions are in millimeters.
This drawing is subject to change without notice.
Body dimensions do not include mold flash or protrusion.
Falls within JEDEC MO-178
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
15
PACKAGE OPTION ADDENDUM
www.ti.com
14-Oct-2022
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
Samples
(4/5)
(6)
TPS79015DBVR
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
PEBI
Samples
TPS79015DBVT
ACTIVE
SOT-23
DBV
5
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
PEBI
Samples
TPS79018DBVR
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
PECI
Samples
TPS79018DBVT
ACTIVE
SOT-23
DBV
5
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
PECI
Samples
TPS79025DBVR
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
PEDI
Samples
TPS79025DBVT
ACTIVE
SOT-23
DBV
5
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
PEDI
Samples
TPS79028DBVR
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
PEEI
Samples
TPS79028DBVT
ACTIVE
SOT-23
DBV
5
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
PEEI
Samples
TPS79030DBVR
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
PEFI
Samples
TPS79030DBVT
ACTIVE
SOT-23
DBV
5
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
PEFI
Samples
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
工商网监
湘ICP备2023018690号
