TPS76918DBV [TI]
ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS; 超低功耗100mA低压降线性稳压器
| 型号： | TPS76918DBV |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS |
| 文件： | 总16页 (文件大小：236K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TPS76901, TPS76912, TPS76915, TPS76918, TPS76925
TPS76927, TPS76928, TPS76930, TPS76933, TPS76950
ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000
DBV PACKAGE
(TOP VIEW)
100-mA Low-Dropout Regulator
Available in 1.2-V, 1.5-V, 1.8-V, 2.5-V, 2.7-V,
2.8-V, 3.0-V, 3.3-V, and 5-V Fixed-Output and
Adjustable Versions
1
2
3
5
OUT
IN
GND
Only 17 µA Quiescent Current at 100 mA
1 µA Quiescent Current in Standby Mode
Dropout Voltage Typically 71 mV at 100mA
Over Current Limitation
4
NC/FB
EN
–40°C to 125°C Operating Junction
TPS76933
GROUND CURRENT
vs
FREE-AIR TEMPERATURE
Temperature Range
5-Pin SOT-23 (DBV) Package
22
21
20
19
18
17
16
15
description
V = 4.3 V
I
The TPS769xx family of low-dropout (LDO)
voltage regulators offers the benefits of low
dropout voltage, ultralow-power operation, and
miniaturized packaging. These regulators feature
low dropout voltages and ultralow quiescent
current compared to conventional LDO
regulators. Offered in a 5-terminal small outline
C
= 4.7 µF
O
I
O
= 100 mA
integrated-circuit
SOT-23
package,
the
TPS769xx series devices are ideal for
micropower operations and where board space is
at a premium.
I
= 0 mA
O
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 71 mV at 100 mA of
–60 –40 –20
0
20 40 60 80 100 120 140
T
A
– Free-Air Temperature – °C
load current (TPS76950), and is directly proportional to the load current. Since the PMOS pass element is a
voltage-driven device, the quiescent current is ultralow (28 µA maximum) and is stable over the entire range
of output load current (0 mA to 100 mA). Intended for use in portable systems such as laptops and cellular
phones, the ultralow-dropout voltage feature and ultralow-power operation result in a significant increase in
system battery operating life.
The TPS769xx also features a logic-enabled sleep mode to shut down the regulator, reducing quiescent current
to 1 µA typical at T = 25°C. The TPS769xx is offered in 1.2-V, 1.5-V, 1.8-V, 2.5-V, 2.7-V, 2.8-V, 3.0-V, 3.3-V,
J
and 5-V fixed-voltage versions and in a variable version (programmable over the range of 1.2 V to 5.5 V).
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 2000, 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
TPS76901, TPS76912, TPS76915, TPS76918, TPS76925
TPS76927, TPS76928, TPS76930, TPS76933, TPS76950
ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000
AVAILABLE OPTIONS
T
J
VOLTAGE
PACKAGE
PART NUMBER
SYMBOL
Variable
1.2V to 5.5V
†
‡
TPS76901DBVT
TPS76901DBVR
PCFI
†
†
†
†
†
†
†
†
†
‡
‡
‡
‡
‡
‡
‡
‡
‡
1.2 V
1.5 V
1.8 V
2.5 V
2.7 V
2.8 V
3.0 V
3.3 V
5.0 V
TPS76912DBVT
TPS76915DBVT
TPS76918DBVT
TPS76925DBVT
TPS76927DBVT
TPS76928DBVT
TPS76930DBVT
TPS76933DBVT
TPS76950DBVT
TPS76912DBVR
TPS76915DBVR
TPS76918DBVR
TPS76925DBVR
TPS76927DBVR
TPS76928DBVR
TPS76930DBVR
TPS76933DBVR
TPS76950DBVR
PCGI
PCHI
PCII
SOT-23
(DBV)
PCJI
PCKI
PCLI
PCMI
PCNI
PCOI
–40°C to 125°C
†
‡
The DBVT indicates tape and reel of 250 parts.
The DBVR indicates tape and reel of 3000 parts.
functional block diagram
TPS76901
OUT
IN
EN
Current Limit
/ Thermal
Protection
V
REF
FB
GND
TPS76912/15/18/25/27/28/30/33/50
OUT
IN
EN
Current Limit
/ Thermal
Protection
V
REF
GND
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76901, TPS76912, TPS76915, TPS76918, TPS76925
TPS76927, TPS76928, TPS76930, TPS76933, TPS76950
ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000
Terminal Functions
TERMINAL
NAME
I/O
DESCRIPTION
NO.
2
GND
EN
Ground
3
I
I
I
Enable input
FB
4
Feedback voltage (TPS76901 only)
Input supply voltage
IN
1
NC
OUT
4
No connection (Fixed options only)
Regulated output voltage
5
O
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Input voltage range
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 13.5 V
Voltage range at EN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to V + 0.3 V
I
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, 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
T
≤ 25°C
DERATING FACTOR
T
= 70°C
T = 85°C
A
A
A
PACKAGE
POWER RATING
ABOVE T = 25°C
POWER RATING POWER RATING
A
Recommended
DBV
DBV
350 mW
437 mW
3.5 mW/°C
3.5 mW/°C
192 mW
280 mW
140 mW
227 mW
Absolute Maximum
recommended operating conditions
MIN NOM
MAX
10
UNIT
V
Input voltage, V (see Note 2)
2.7
1.2
0
I
Output voltage range, V
5.5
V
O
Continuous output current, I (see Note 3)
100
125
mA
°C
O
Operating junction temperature, T
–40
J
NOTES: 2. To calculate the minimum input voltage for your maximum output current, use the following formula:
V (min) = V (max) + V (max load)
I
O
DO
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.
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76901, TPS76912, TPS76915, TPS76918, TPS76925
TPS76927, TPS76928, TPS76930, TPS76933, TPS76950
ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000
electrical characteristics over recommended operating free-air temperature range,
V = V
+ 1 V, I = 100 mA, EN = 0 V, C = 4.7 µF (unless otherwise noted)
I
O(typ)
O
O
PARAMETER
TEST CONDITIONS
1.2 V ≤ V ≤ 5.5 V, T = 25°C
MIN
TYP
MAX
UNIT
V
O
O
J
TPS76901
TPS76912
TPS76915
TPS76918
TPS76925
TPS76927
TPS76928
TPS76930
TPS76933
TPS76950
1.2 V ≤ V ≤ 5.5 V,
T = –40°C to 125°C 0.97V
1.03V
O
J
O
O
T = 25°C,
J
2.7 V < V < 10 V
IN
1.224
1.5
1.8
2.5
2.7
2.8
3.0
3.3
5.0
T = –40°C to 125°C, 2.7 V < V < 10 V
J IN
1.187
1.261
T = 25°C,
J
2.7 V < V < 10 V
IN
T = –40°C to 125°C, 2.7 V < V < 10 V
J IN
1.455
1.746
2.425
2.619
2.716
2.910
3.201
4.850
1.545
1.854
2.575
2.781
2.884
3.090
3.399
5.150
T = 25°C,
J
2.8 V < V < 10 V
IN
T = –40°C to 125°C, 2.8 V < V < 10 V
J IN
T = 25°C,
J
3.5 V < V < 10 V
IN
T = –40°C to 125°C, 3.5 V < V < 10 V
J IN
Output voltage (10 µA to 100 mA
load) (see Note 4)
V
T = 25°C,
J
3.7 V < V < 10 V
IN
T = –40°C to 125°C, 3.7 V < V < 10 V
J IN
T = 25°C,
J
3.8 V < V < 10 V
IN
T = –40°C to 125°C, 3.8 V < V < 10 V
J IN
T = 25°C,
J
4.0 V < V < 10 V
IN
T = –40°C to 125°C, 4.0 V < V < 10 V
J IN
T = 25°C,
J
4.3 V < V < 10 V
IN
T = –40°C to 125°C, 4.3 V < V < 10 V
J IN
T = 25°C,
J
6.0 V < V < 10 V
IN
T = –40°C to 125°C, 6.0 V < V < 10 V
J
IN
0 mA < I < 100 mA,
EN = 0V,
T = 25°C
J
O
17
Quiescent current (GND current)
(See Note 4 and Note 5)
µA
mV
EN = 0V,
T = –40°C to 125°C
J
I
I
= 100 mA,
O
28
EN = 0V,
T = 25°C
J
= 0 to 100 mA,
O
Load regulation
12
V
+ 1 V < V ≤ 10 V, T = 25°C,
I J
O
0.04
See Note 4
Output voltage line regulation (∆V /V ) (See Note 5)
%/V
O
O
V
+ 1 V < V ≤ 10 V,
O
I
0.1
T = –40°C to 125°C, See Note 4
J
BW = 300 Hz to 50 kHz,
Output noise voltage
Output current limit
190
µVrms
C
= 10 µF,
T = 25°C
O
J
V
O =
0 V,
See Note 4
350
1
750
2
mA
µA
µA
EN = V ,
2.7 < V < 10 V
I
I
Standby current
T = –40°C to 125°C
J
NOTES: 4. Minimum IN operating voltage is 2.7 V or V
+ 1 V, whichever is greater. Maximum IN voltage 10 V, minimum output current
O(typ)
= 10 V:
% V
10 µA, maximum output current 100 mA.
5. If V ≤ 1.8 V then V
= 2.7 V, V
O
imin
imax
V
V
V
2.7 V
O
O
imax
100
Line Reg. (mV)
1000
If V ≥ 2.5 V then V
imin
= V + 1 V, V = 10 V:
imax
O
O
V
V
1 V
imax
O
Line Reg. (mV)
% V
1000
100
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76901, TPS76912, TPS76915, TPS76918, TPS76925
TPS76927, TPS76928, TPS76930, TPS76933, TPS76950
ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000
electrical characteristics over recommended operating free-air temperature range,
V = V
+ 1 V, I = 100 mA, EN = 0 V, C = 4.7 µF (unless otherwise noted) (continued)
I
O(typ)
O
O
PARAMETER
TEST CONDITIONS
FB = 1.224 V (TPS76901)
2.7 V < V < 10 V
MIN
–1
TYP
MAX
UNIT
µA
V
FB input current
1
High level enable input voltage
Low level enable input voltage
1.7
I
2.7 V < V < 10 V
I
0.9
V
f = 1 kHz,
T = 25°C,
J
C
= 10 µF,
O
Power supply ripple rejection
Input current (EN)
60
0
dB
See Note 4
EN = 0 V
–1
–1
1
1
µA
µA
EN = V
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
= 50 mA,
= 50 mA,
= 100 mA,
= 100 mA,
= 50 mA,
= 50 mA,
= 100 mA,
= 100 mA,
= 50 mA,
= 50 mA,
= 100 mA,
= 100 mA,
= 50 mA,
= 50 mA,
= 100 mA,
= 100 mA,
T = 25°C
60
122
57
O
J
T = –40°C to 125°C
J
125
245
115
230
100
200
85
O
TPS76928
TPS76930
TPS76933
TPS76950
T = 25°C
J
O
T = –40°C to 125°C
J
O
T = 25°C
J
O
T = –40°C to 125°C
J
O
T = 25°C
J
115
48
O
T = –40°C to 125°C
J
O
Dropout voltage (See Note 6)
mV
T = 25°C
J
O
T = –40°C to 125°C
J
O
T = 25°C
J
98
O
T = –40°C to 125°C
J
O
T = 25°C
J
35
O
T = –40°C to 125°C
J
O
T = 25°C
J
71
O
T = –40°C to 125°C
J
170
O
NOTES: 4. Minimum IN operating voltage is 2.7 V or V
+ 1 V, whichever is greater. Maximum IN voltage 10 V, minimum output current
O(typ)
10 µA, maximum output current 100 mA.
6. IN voltage equals V (Typ) – 100mV; TPS76901 output voltage set to 3.3V nominal with external resistor divider. TPS76912,
O
TPS76915, TPS76918, TPS76925, and TPS76927 dropout voltage limited by input voltage range limitations.
TYPICAL CHARACTERISTICS
Table of Graphs
FIGURE
vs Output current
vs Free-air temperature
vs Free-air temperature
vs Frequency
1, 2, 3
4, 5, 6
7
V
Output voltage
O
Ground current
Output spectral noise density
Output impedance
Dropout voltage
8
Z
o
vs Frequency
9
V
DO
vs Free-air temperature
vs Frequency
10
Ripple rejection
11
LDO startup time
12
Line transient response
Load transient response
13, 15
14, 16
17, 19
18, 20
vs Output current
Equivalent series resistance (ESR)
vs Added ceramic capacitance
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76901, TPS76912, TPS76915, TPS76918, TPS76925
TPS76927, TPS76928, TPS76930, TPS76933, TPS76950
ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000
TYPICAL CHARACTERISTICS
TPS76925
TPS76915
OUTPUT VOLTAGE
vs
OUTPUT CURRENT
OUTPUT VOLTAGE
vs
OUTPUT CURRENT
1.498
1.496
1.494
1.492
1.490
1.488
2.498
2.496
2.494
2.492
2.490
2.488
2.486
V = 2.7 V
I
V = 3.5 V
I
C
= 4.7 µF
= 25° C
O
C
= 4.7 µF
= 25° C
O
T
A
T
A
1.486
1.484
2.484
2.482
0
20
40
60
80
100
0
20
40
60
80
100
I
O
– Output Current – mA
I
O
– Output Current – mA
Figure 1
Figure 2
TPS76915
TPS76933
OUTPUT VOLTAGE
vs
OUTPUT VOLTAGE
vs
FREE-AIR TEMPERATURE
OUTPUT CURRENT
1.496
1.494
1.492
1.490
1.488
1.486
1.484
3.284
3.282
3.280
3.278
3.276
3.274
V = 4.3 V
I
C
T
= 4.7 µF
= 25° C
O
A
I
= 1 mA
V = 2.7 V
O
I
C
= 4.7 µF
O
I
= 100 mA
O
3.272
3.270
1.482
1.480
–60 –40 –20
0
20 40 60 80 100 120 140
0
20
40
60
80
100
T
A
– Free-Air Temperature – °C
I
O
– Output Current – mA
Figure 3
Figure 4
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76901, TPS76912, TPS76915, TPS76918, TPS76925
TPS76927, TPS76928, TPS76930, TPS76933, TPS76950
ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000
TYPICAL CHARACTERISTICS
TPS76925
OUTPUT VOLTAGE
vs
TPS76933
OUTPUT VOLTAGE
vs
FREE-AIR TEMPERATURE
FREE-AIR TEMPERATURE
2.496
2.494
2.492
3.285
3.280
I
O
= 1 mA
I
O
= 1 mA
V = 4.3 V
2.490
2.488
2.486
2.484
I
3.275
3.270
3.265
C
= 4.7 µF
O
I
O
= 100 mA
I
O
= 100 mA
2.482
2.480
2.478
2.476
V = 3.5 V
3.260
3.255
I
C
= 4.7 µF
O
–60 –40 –20
0
20 40 60 80 100 120 140
–60 –40 –20
0
20 40 60 80 100 120 140
T
A
– Free-Air Temperature – °C
T
A
– Free-Air Temperature – °C
Figure 5
Figure 6
TPS76933
TPS76933
GROUND CURRENT
vs
FREE-AIR TEMPERATURE
OUTPUT SPECTRAL NOISE DENSITY
vs
FREQUENCY
22
21
20
19
18
17
16
15
2
V = 4.3 V
I
1.8
1.6
C
= 4.7 µF
O
C
= 10 µF
= 1 mA
O
I
O
C
= 4.7 µF
= 100 mA
O
1.4
1.2
1
I
O
I
O
= 100 mA
0.8
I
= 0 mA
C
= 4.7 µF
= 1 mA
O
O
I
O
0.6
0.4
0.2
0
C
= 10 µF
O
V = 4.3 V
I
I
O
= 100 mA
–60 –40 –20
0
20 40 60 80 100 120 140
100
1k
10k
100k
T
A
– Free-Air Temperature – °C
f – Frequency – Hz
Figure 7
Figure 8
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76901, TPS76912, TPS76915, TPS76918, TPS76925
TPS76927, TPS76928, TPS76930, TPS76933, TPS76950
ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000
TYPICAL CHARACTERISTICS
TPS76933
OUTPUT IMPEDANCE
vs
DROPOUT VOLTAGE
vs
FREQUENCY
FREE-AIR TEMPERATURE
2
1.8
1.6
1000
100
10
V = 3.2 V
V = 4.3 V
I
I
C
= 4.7 µF
C
= 4.7 µF
O
O
ESR = 0.3 Ω
= 25° C
T
A
1.4
1.2
1
I
O
= 100 mA
0.8
I
O
= 1 mA
0.6
I
O
= 10 mA
0.4
0.2
0
I
O
= 100 mA
1 k
1
10
100
10 k
100 k
1 M
–60 –40 –20
0
20 40 60 80 100 120 140
f – Frequency – Hz
T
A
– Free-Air Temperature – °C
Figure 9
Figure 10
TPS76933
RIPPLE REJECTION
vs
LDO STARTUP TIME
FREQUENCY
100
90
80
70
60
50
EN
I
O
= 1 mA
40
30
20
10
I
O
= 100 mA
V = 4.3 V
I
V
O
C
= 4.7 µF
O
0
ESR = 0.3 Ω
–10
10
100
1 k
10 k
100 k
1 M
10 M
0
20 40 60 80 100 120 140 160 180 200
f – Frequency – Hz
t – Time – µs
Figure 11
Figure 12
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76901, TPS76912, TPS76915, TPS76918, TPS76925
TPS76927, TPS76928, TPS76930, TPS76933, TPS76950
ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000
TYPICAL CHARACTERISTICS
TPS76915
TPS76915
LINE TRANSIENT RESPONSE
LOAD TRANSIENT RESPONSE
100
0
10
0
–10
3.7
0
–200
–400
2.7
I
C
= 10 mA
L
V = 2.7 V
I
= 4.7 µF
O
C
= 10 µF
O
ESR = 0.3 Ω
ESR = 0.3 Ω
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
TPS76933
TPS76933
LINE TRANSIENT RESPONSE
LOAD TRANSIENT RESPONSE
10
0
100
0
–10
V = 4.3 V
I
O
C
= 4.7 µF
5.3
ESR = 0.3 Ω
100
0
4.3
I
C
= 10 mA
L
–100
= 4.7 µF
O
ESR = 0.3 Ω
0
20 40 60 80 100 120 140 160 180
0
20 40 60 80 100 120 140 160 180
t – Time – µs
t – Time – µs
Figure 15
Figure 16
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76901, TPS76912, TPS76915, TPS76918, TPS76925
TPS76927, TPS76928, TPS76930, TPS76933, TPS76950
ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000
TYPICAL CHARACTERISTICS
TPS76933
TYPICAL REGIONS OF STABILITY
EQUIVALENT SERIES RESISTANCE (ESR)
vs
TPS76933
TYPICAL REGIONS OF STABILITY
EQUIVALENT SERIES RESISTANCE (ESR)
vs
†
OUTPUT CURRENT
ADDED CERAMIC CAPACITANCE
100
100
V
C
= 4.3 V
= 4.7 µF
V
C
= 4.3 V
= 4.7 µF
O
IN
O
IN
3.3 V LDO
I = 100 mA
L
Region of Instability
Region of Stability
10
Region of Instability
Region of Stability
10
1
1
0.1
0
25
50
75
100
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
TPS76933
TPS76933
TYPICAL REGIONS OF STABILITY
EQUIVALENT SERIES RESISTANCE (ESR)
vs
TYPICAL REGIONS OF STABILITY
†
EQUIVALENT SERIES RESISTANCE (ESR)
vs
OUTPUT CURRENT
ADDED CERAMIC CAPACITANCE
100
10
100
V
C
= 4.3 V
= 10 µF
V
C
= 4.3 V
= 10 µF
O
IN
O
IN
3.3 V LDO
I = 100 mA
L
Region of Instability
Region of Instability
Region of Stability
10
1
Region of Stability
0.1
1
0
25
50
75
100
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 19
Figure 20
10
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76901, TPS76912, TPS76915, TPS76918, TPS76925
TPS76927, TPS76928, TPS76930, TPS76933, TPS76950
ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000
APPLICATION INFORMATION
The TPS769xx 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 nominally), and enable
inputs to reduce supply currents to 1 µA when the regulators are turned off.
device operation
The TPS769xx 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 TPS769xx 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 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 TPS769xx internal circuitry, reducing the supply
current to 1µA. A voltage of less than 0.9 V on the EN input will enable the TPS769xx 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.
A typical application circuit is shown in Figure 21.
†
TPS769xx
1
3
V
IN
I
4
5
NC/FB
OUT
V
O
C1
1 µF
EN
+
4.7 µF
GND
ESR = 0.2 Ω
2
†
TPS76912, TPS76915, TPS76918, TPS76925, TPS76927, TPS76928,
TPS76930, TPS76933, TPS76950 (fixed-voltage options).
Figure 21. Typical Application Circuit
11
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76901, TPS76912, TPS76915, TPS76918, TPS76925
TPS76927, TPS76928, TPS76930, TPS76933, TPS76950
ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000
APPLICATION INFORMATION
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 TPS769xx, 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 TPS769xx 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 0.2Ω and 10 Ω. toensurestability. Capacitorvalueslarger
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.
MFR.
KEMET
SPRAGUE
SPRAGUE
AVX
VALUE
4.7 µF
10 µF
MAX ESR
1.5 Ω
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
T494B475K016AS
195D106x0016x2T
695D106x003562T
TPSC475K035R0600
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. Contact manufacturer for minimum ESR values.
A
12
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76901, TPS76912, TPS76915, TPS76918, TPS76925
TPS76927, TPS76928, TPS76930, TPS76933, TPS76950
ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000
APPLICATION INFORMATION
output voltage programming
The output voltage of the TPS76901 adjustable regulator is programmed using an external resistor divider as
shown in Figure 22. The output voltage is calculated using:
R1
R2
(1)
V
V
1
O
ref
Where:
V
= 1.224 V typ (the internal reference voltage)
ref
Resistors R1 and R2 should be chosen for approximately 7-µA divider current. Lower value resistors can be
used but offer no inherent advantage and waste more power. Higher values should be avoided as leakage
currents at FB increase the output voltage error. The recommended design procedure is to choose
R2 = 169 kΩ to set the divider current at 7 µA and then calculate R1 using:
V
O
R1
1
R2
(2)
V
ref
OUTPUT VOLTAGE
PROGRAMMING GUIDE
TPS76901
DIVIDER RESISTANCE
OUTPUT
VOLTAGE
(V)
1
‡
V
(kΩ)
I
IN
1 µF
R1
R2
5
2.5
3.3
3.6
4.0
5.0
174
287
324
383
523
169
169
169
169
169
V
OUT
FB
O
≥1.7 V
3
R1
R2
EN
4
≤0.9 V
4.7 µF
GND
2
ESR = 0.2 Ω
‡
1% values shown.
Figure 22. TPS76901 Adjustable LDO Regulator Programming
13
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TPS76901, TPS76912, TPS76915, TPS76918, TPS76925
TPS76927, TPS76928, TPS76930, TPS76933, TPS76950
ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000
APPLICATION INFORMATION
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, P
, and the actual dissipation, P , which must be less than
D(max)
D
or equal to 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. Excessive power dissipation will trigger the
thermal protection circuit.
regulator protection
The TPS769xx 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 TPS769xx features internal current limiting and thermal protection. During normal operation, the TPS769xx
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 thedevice
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
TPS76901, TPS76912, TPS76915, TPS76918, TPS76925
TPS76927, TPS76928, TPS76930, TPS76933, TPS76950
ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000
MECHANICAL DATA
DBV (R-PDSO-G5)
PLASTIC SMALL-OUTLINE PACKAGE
0,40
M
0,25
0,95
5
0,20
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.
15
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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