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FEATURES
DESCRIPTION
3
2
4
5
DBV PACKAGE
(TOP VIEW)
1
IN
GND
EN
OUT
NC/FB
TA−Free-Air Temperature −°C
15
22
TPS77033
GROUND CURRENT
vs
FREE-AIR TEMPERATURE
Ground Current −Aµ
VI= 4.3 V
CO= 4.7 µF
−40 0−20 20 140−60 40 80 100 12060
21
20
19
18
17
16
IO= 0 mA
IO= 50 mA
TPS77001-Q1, TPS77012-Q1, TPS77015-Q1, TPS77018-Q1, TPS77025-Q1TPS77027-Q1, TPS77028-Q1, TPS77030-Q1, TPS77033-Q1, TPS77050-Q1ULTRALOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS
SLVS596A – AUGUST 2005 – REVISED NOVEMBER 2005
•Qualified for Automotive Applications•Customer-Specific Configuration Control CanBe Supported Along With Major-ChangeApproval
•50-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 andAdjustable Versions•Only 17- µA Quiescent Current at 50 mA•1- µA Quiescent Current in Standby Mode•Dropout Voltage Typically 35 mV at 50 mA•–40 °C to 125 °C Operating JunctionTemperature Range•5-Pin SOT-23 (DBV) Package
The TPS770xx family of low-dropout (LDO) voltageregulators offers the benefits of low-dropout voltage,ultralow-power operation, and miniaturizedpackaging. These regulators feature low dropoutvoltages and ultralow quiescent current compared toconventional LDO regulators. Offered in a 5-terminalsmall-outline integrated-circuit SOT-23 package, theTPS770xx series devices are ideal for micropoweroperations and where board space is at a premium.
A combination of new circuit design and processinnovation has enabled the usual PNP pass transistorto be replaced by a PMOS pass element. Becausethe PMOS pass element behaves as a low-valueresistor, the dropout voltage is very low — typically35 mV at 50 mA of load current (TPS77050) — and isdirectly proportional to the load current. Since thePMOS pass element is a voltage-driven device, thequiescent current is ultralow (28 µA maximum) and isstable over the entire range of output load current(0 mA to 50 mA). Intended for use in portablesystems such as laptops and cellular phones, theultralow-dropout voltage feature and ultralow-poweroperation result in a significant increase in systembattery operating life.
The TPS770xx also features a logic-enabled sleepmode to shut down the regulator, reducing quiescentcurrent to 1 µA typical at T
J
= 25 °C. The TPS770xx isoffered 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-voltage versions and in avariable version (programmable over the range of1.2 V to 5.5 V).
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of TexasInstruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2005, Texas Instruments IncorporatedProducts conform to specifications per the terms of the TexasInstruments standard warranty. Production processing does notnecessarily include testing of all parameters.
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TPS77001
OUT
IN
FB
GND
EN
VREF
TPS77012/15/18/25/27/28/30/33/50
OUT
IN
GND
EN
VREF
Current Limit
/ Thermal
Protection
Current Limit
/ Thermal
Protection
TPS77001-Q1, TPS77012-Q1, TPS77015-Q1, TPS77018-Q1, TPS77025-Q1TPS77027-Q1, TPS77028-Q1, TPS77030-Q1, TPS77033-Q1, TPS77050-Q1ULTRALOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS
SLVS596A – AUGUST 2005 – REVISED NOVEMBER 2005
AVAILABLE OPTIONS
T
J
VOLTAGE PACKAGE PART NUMBER
(1)
SYMBOL
Variable
TPS77001QDBVRQ1 PCPI
(2)1.2 V to 5.5 V1.2 V TPS77012QDBVRQ1 PCQI
(2)
1.5 V TPS77015QDBVRQ1 PCRI
(2)
1.8 V TPS77018QDBVRQ1 PCSI
(2)
2.5 V TPS77025QDBVRQ1 PCTI
(2)–40 °C to 125 °C SOT-23 – DBV2.7 V TPS77027QDBVRQ1 PCIU
(2)
2.8 V TPS77028QDBVRQ1 PCVI
(2)
3.0 V TPS77030QDBVRQ1 PCWI
(2)
3.3 V TPS77033QDBVRQ1 PCXI5.0 V TPS77050QDBVRQ1 PCYI
(2)
(1) DBVR indicates tape and reel of 3000 parts.(2) PREVIEW only
FUNCTIONAL BLOCK DIAGRAM
2
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Absolute Maximum Ratings
(1)
Dissipation Ratings
Recommended Operating Conditions
TPS77001-Q1, TPS77012-Q1, TPS77015-Q1, TPS77018-Q1, TPS77025-Q1TPS77027-Q1, TPS77028-Q1, TPS77030-Q1, TPS77033-Q1, TPS77050-Q1ULTRALOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS
SLVS596A – AUGUST 2005 – REVISED NOVEMBER 2005
TERMINAL FUNCTIONS
TERMINAL
I/O DESCRIPTIONNAME NO.
GND 2 GroundEN 3 I Enable inputFB 4 I Feedback voltage (TPS77001 only)IN 1 I Input supply voltageNC 4 No connection (fixed options only)OUT 5 O Regulated output voltage
over operating free-air temperature range (unless otherwise noted)
UNIT
Input voltage range
(2)
–0.3 V to 13.5 VVoltage range at EN –0.3 V to V
I
+ 0.3 VVoltage on OUT, FB 7 VPeak output current Internally limitedESD rating, HBM 2 kVContinuous total power dissipation See Dissipation Rating TableT
J
Operating virtual junction temperature range –40 °C to 150 °CT
stg
Storage temperature range –65 °C to 150 °CHuman-Body Model (HBM) 4 kV (H2)ESD classification per AEC Q100 Machine Model (MM) 300 V (M3)Charged-Device Model (CDM) 1500 V (C5)
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratingsonly, and functional operation of the device at these or any other conditions beyond those indicated under recommended operatingconditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.(2) All voltage values are with respect to network ground terminal.
DERATING FACTOR T
A
≤25 °C T
A
= 70 °C T
A
= 85 °CBOARD PACKAGE R
θJC
R
θJA
ABOVE T
A
= 25 °C POWER RATING POWER RATING POWER RATING
Low K
(1)
DBV 65.8 °C/W 259 °C/W 3.9 mW/ °C 386 mW 212 mW 154 mWHigh K
(2)
DBV 65.8 °C/W 180 °C/W 5.6 mW/ °C 555 mW 305 mW 222 mW
(1) The JEDEC Low K (1s) board design used to derive this data was a 3-in ×3-in, two-layer board with 2-oz copper traces on top of theboard.
(2) The JEDEC High K (2s2p) board design used to derive this data was a 3-in ×3-in, multilayer board with 1-oz internal power and groundplanes and 2-oz copper traces on top and bottom of the board.
MIN MAX UNIT
V
I
Input voltage
(1)
2.7 10 VV
O
Output voltage 1.2 5.5 VI
O
Continuous output current
(2)
0 50 mAT
J
Operating junction temperature –40 125 °C
(1) To calculate the minimum input voltage for your maximum output current, use the following formula:V
I
(min) = V
O
(max) + V
DO
(max load)(2) Continuous output current and operating junction temperature are limited by internal protection circuitry, but it is not recommended thatthe device operate under conditions beyond those specified in this table for extended periods of time.
3
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Line Regulation (mV) = (%/V) ´´1000
V (V –2.7 V)
O Imax
100
Line Regulation (mV) = (%/V) ´´1000
V (V –(V + 1 V))
O Imax O
100
Electrical Characteristics
TPS77001-Q1, TPS77012-Q1, TPS77015-Q1, TPS77018-Q1, TPS77025-Q1TPS77027-Q1, TPS77028-Q1, TPS77030-Q1, TPS77033-Q1, TPS77050-Q1ULTRALOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS
SLVS596A – AUGUST 2005 – REVISED NOVEMBER 2005
over recommended operating free-air temperature range, V
I
= V
O
(typ) + 1 V, I
O
= 50 mA, EN = 0 V, C
o
= 4.7 µF (unlessotherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
T
J
= 25 °C, 1.2 V ≤V
O
≤5.5 V V
OTPS77001
T
J
= –40 °C to 125 °C, 1.2 V ≤V
O
≤5.5 V 0.97 V
O
1.03 V
O
T
J
= 25 °C, 2.7 V < V
IN
< 10 V 1.224TPS77012
T
J
= –40 °C to 125 °C, 2.7 V < V
IN
< 10 V 1.187 1.261T
J
= 25 °C, 2.7 V < V
IN
< 10 V 1.5TPS77015
T
J
= –40 °C to 125 °C, 2.7 V < V
IN
< 10 V 1.455 1.545T
J
= 25 °C, 2.8 V < V
IN
< 10 V 1.8TPS77018
T
J
= –40 °C to 125 °C, 2.8 V < V
IN
< 10 V 1.746 1.854T
J
= 25 °C, 3.5 V < V
IN
< 10 V 2.5TPS77025
T
J
= –40 °C to 125 °C, 3.5 V < V
IN
< 10 V 2.425 2.575Output voltage
V(10 µA to 50 mA load)
(1)
T
J
= 25 °C, 3.7 V < V
IN
< 10 V 2.7TPS77027
T
J
= –40 °C to 125 °C, 3.7 V < V
IN
< 10 V 2.619 2.781T
J
= 25 °C, 3.8 V < V
IN
< 10 V 2.8TPS77028
T
J
= –40 °C to 125 °C, 3.8 V < V
IN
< 10 V 2.716 2.884T
J
= 25 °C, 4.0 V < V
IN
< 10 V 3.0TPS77030
T
J
= –40 °C to 125 °C, 4.0 V < V
IN
< 10 V 2.910 3.090T
J
= 25 °C, 4.3 V < V
IN
< 10 V 3.3TPS77033
T
J
= –40 °C to 125 °C, 4.3 V < V
IN
< 10 V 3.201 3.399T
J
= 25 °C, 6.0 V < V
IN
< 10 V 5.0TPS77050
T
J
= –40 °C to 125 °C, 6.0 V < V
IN
< 10 V 4.850 5.150EN = 0 V, 0 mA < I
O
< 50 mA, T
J
= 25 °C 17Quiescent current (GND current)
(1)
µAEN = 0 V, I
O
= 50 mA, T
J
= –40 °C to 125 °C 28V
O
+ 1 V < V
I
< 10 V, T
J
= 25 °C 0.04Output voltage line regulation ( ∆V
O
/V
O
)
(1) (2)
%/VV
O
+ 1 V < V
I
< 10 V, T
J
= –40 °C to 125 °C 0.1Load regulation EN = 0 V, I
O
= 0 to 50 mA, T
J
= 25 °C 8 mVOutput noise voltage BW = 300 Hz to 50 kHz, C
o
= 10 µF, T
J
= 25 °C 190 µV
rms
Output current limit V
O
= 0 V
(1)
350 750 mAEN = V
I
, 2.7 < V
I
< 10 V 1Standby current µAT
J
= –40 °C to 125 °C 2FB input current FB = 1.224 V (TPS77001) –1 1 µAHigh-level enable input voltage 2.7 V < V
I
< 10 V 1.7 VLow-level enable input voltage 2.7 V < V
I
< 10 V 0.9 VPower-supply ripple rejection f = 1 kHz, C
O
= 10 µF, T
J
= 25 °C
(1)
60 dBEN = 0 V –1 0 1Input current ( EN) µAEN = V
I
–1 1
(1) Minimum IN operating voltage is 2.7 V or V
O
(typ) + 1 V, whichever is greater. Maximum IN voltage 10 V, minimum output current 10 µA,maximum output current 50 mA.(2) If V
O
≤1.8 V then V
Imin
= 2.7 V, V
Imax
= 10 V:
If V
O
≥2.5 V, then V
Imin
= V
O
+ 1 V, V
Imax
= 10 V:
4
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TPS77001-Q1, TPS77012-Q1, TPS77015-Q1, TPS77018-Q1, TPS77025-Q1TPS77027-Q1, TPS77028-Q1, TPS77030-Q1, TPS77033-Q1, TPS77050-Q1ULTRALOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS
SLVS596A – AUGUST 2005 – REVISED NOVEMBER 2005
Electrical Characteristics (continued)over recommended operating free-air temperature range, V
I
= V
O
(typ) + 1 V, I
O
= 50 mA, EN = 0 V, C
o
= 4.7 µF (unlessotherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
I
O
= 50 mA, T
J
= 25 °C 60TPS77028
I
O
= 50 mA, T
J
= –40 °C to 125 °C 125I
O
= 50 mA, T
J
= 25 °C 57TPS77030
I
O
= 50 mA, T
J
= –40 °C to 125 °C 115Dropout voltage
(3)
mVI
O
= 50 mA, T
J
= 25 °C 48TPS77033
I
O
= 50 mA, T
J
= –40 °C to 125 °C 100I
O
= 50 mA, T
J
= 25 °C 35TPS77050
I
O
= 50 mA, T
J
= –40 °C to 125 °C 85
(3) IN voltage equals V
O
(typ) – 100 mV; TPS77001 output voltage is set to 3.3 V (nom) with external resistor divider. TPS77012,TPS77015, TPS77018, TPS77025, and TPS77027 dropout voltage is limited by input voltage range limitations.
5
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TYPICAL CHARACTERISTICS
TPS77001-Q1, TPS77012-Q1, TPS77015-Q1, TPS77018-Q1, TPS77025-Q1TPS77027-Q1, TPS77028-Q1, TPS77030-Q1, TPS77033-Q1, TPS77050-Q1ULTRALOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS
SLVS596A – AUGUST 2005 – REVISED NOVEMBER 2005
Table of Graphs
FIGURE
vs Output current 1, 2, 3V
O
Output voltage
vs Free-air temperature 4, 5, 6Ground current vs Free-air temperature 7Output spectral noise density vs Frequency 8Z
O
Output impedance vs Frequency 9V
DO
Dropout voltage vs Free-air temperature 10Ripple rejection vs Frequency 11LDO startup time 12Line transient response 13, 15Load transient response 14, 16vs Output current 17, 19Equivalent series resistance (ESR)
vs Added ceramic capacitance 18, 20
6
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2.496
2.488
2.482
10 30
2.494
2.490
2.486
20 40
2.498
050
−Output Voltage −V
VO
2.492
2.484
IO−Output Current −mA
V = 3.5 V
C = 4.7 µF
T = 25°C
I
A
O
IO−Output Current −mA
1.494
1.488
1.484
10 30
1.492
1.490
1.486
20 40
1.498
050
−Output Voltage −V
VO
1.496
VI= 2.7 V
CO= 4.7 µF
TA= 25°C
IO−Output Current −mA
−Output Voltage −V
VO
3.280
3.274
3.270
3.278
3.276
3.272
3.284
3.282
10 3020 40050
VI= 4.3 V
CO= 4.7 µF
TA= 25°C
TA−Free-Air Temperature −°C
1.486
1.480
−40 0
1.488
1.484
−20 20 140
1.496
−60 40 80
1.492
1.494
100 120
−Output Voltage −V
VO
1.490
1.482
60
IO= 1 mA VI= 2.7 V
CO= 4.7 µF
IO= 50 mA
TPS77001-Q1, TPS77012-Q1, TPS77015-Q1, TPS77018-Q1, TPS77025-Q1TPS77027-Q1, TPS77028-Q1, TPS77030-Q1, TPS77033-Q1, TPS77050-Q1ULTRALOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS
SLVS596A – AUGUST 2005 – REVISED NOVEMBER 2005
TPS77025 TPS77015OUTPUT VOLTAGE OUTPUT VOLTAGEvs vsOUTPUT CURRENT OUTPUT CURRENT
Figure 1. Figure 2.
TPS77033 TPS77015OUTPUT VOLTAGE OUTPUT VOLTAGEvs vsOUTPUT CURRENT FREE-AIR TEMPERATURE
Figure 3. Figure 4.
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TA−Free-Air Temperature −°C
3.265
3.260
3.255
3.270
3.285
3.275
3.280
−Output Voltage −V
VO
−40 0−20 20 140−60 40 80 100 12060
IO= 50 mA
VI= 4.3 V
CO= 4.7 µFIO= 1 mA
TA−Free-Air Temperature −°C
2.476
2.492
2.486
2.496
−Output Voltage −V
VO
2.478
2.490
2.480
2.494
2.482
−40 0−20 20 140−60 40 80 100 12060
IO= 1 mA
IO= 50 mA
VI= 3.5 V
CO= 4.7 µF
2.488
2.484
TA−Free-Air Temperature −°C
15
22
Ground Current −A
µ
VI= 4.3 V
CO= 4.7 µF
−40 0−20 20 140−60 40 80 100 12060
21
20
19
18
17
16
IO= 0 mA
IO= 50 mA
f−Frequency −Hz
1k 10k 100k
CO= 10 µF
IO= 1 mA
VI= 4.3 V
0
1.6
1
2
0.2
1.4
0.4
1.8
0.6
1.2
0.8
100
CO= 4.7 µF
IO= 1 mA
CO= 4.7 µF
IO= 50 mA
CO= 10 µF
IO= 50 mA
VHz
Output Spectral Noise Density −µ
TPS77001-Q1, TPS77012-Q1, TPS77015-Q1, TPS77018-Q1, TPS77025-Q1TPS77027-Q1, TPS77028-Q1, TPS77030-Q1, TPS77033-Q1, TPS77050-Q1ULTRALOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS
SLVS596A – AUGUST 2005 – REVISED NOVEMBER 2005
TPS77025 TPS77033OUTPUT VOLTAGE OUTPUT VOLTAGEvs vsFREE-AIR TEMPERATURE FREE-AIR TEMPERATURE
Figure 5. Figure 6.
TPS77033 TPS77033GROUND CURRENT OUTPUT SPECTRAL NOISE DENSITYvs vsFREE-AIR TEMPERATURE FREQUENCY
Figure 7. Figure 8.
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100 1M10 1k
f−Frequency −Hz
10k
−Output Impedance −ZoΩ
0
1.6
1
2
0.2
1.4
0.4
1.8
0.6
1.2
0.8
100k
VI= 4.3 V
CO= 4.7 µF
IO= 50 mA
IO= 1 mA
10M1M100k10k1k100
Ripple Rejection −dB
f−Frequency −Hz
100
60
50
40
30
20
10
0
−10
10
VI= 4.3 V
CO= 4.7 µF
ESR = 0.3 Ω
70
80
90
IO= 50 mA
IO= 1 mA
t−Time −µs
0604020 80 100 140120 160 180 200
VO
EN
TPS77001-Q1, TPS77012-Q1, TPS77015-Q1, TPS77018-Q1, TPS77025-Q1TPS77027-Q1, TPS77028-Q1, TPS77030-Q1, TPS77033-Q1, TPS77050-Q1ULTRALOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS
SLVS596A – AUGUST 2005 – REVISED NOVEMBER 2005
OUTPUT IMPEDANCE TPS77033vs DROPOUT VOLTAGEFREQUENCY vsFREE-AIR TEMPERATURE
Figure 9. Figure 10.
TPS77033 LDO STARTUP TIMERIPPLE REJECTION
vsFREQUENCY
Figure 11. Figure 12.
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3.7
t−Time −µs
0604020 80 100 140120 160 180 200
IL= 10 mA
CO= 4.7 µF
ESR = 0.3 Ω
2.7
10
0
−10
V–Input Voltage –V
IV–Output Voltage –mV
O
t−Time −µs
0
0
0604020 80 100 140120 160 180 200
Current Load −mA
50
VI= 2.7 V
CO= 10 µF
ESR = 0.3 Ω
−50
−100
VO
Output Voltage −mV
∆−Change In
t−Time −µs
5.3
0604020 80 100 140120 160 180
IL= 10 mA
CO= 4.7 µF
ESR = 0.3 Ω
4.3
10
0
−10
V–Input Voltage –V
IV–Output Voltage –mV
O
t−Time −µs
0
0604020 80 100 140120 160 180
Current Load −mA
50
0
−20
−40
VI= 4.3 V
CO= 4.7 µF
ESR = 0.3 Ω
VO
Output Voltage −mV
∆−Change In
TPS77001-Q1, TPS77012-Q1, TPS77015-Q1, TPS77018-Q1, TPS77025-Q1TPS77027-Q1, TPS77028-Q1, TPS77030-Q1, TPS77033-Q1, TPS77050-Q1ULTRALOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS
SLVS596A – AUGUST 2005 – REVISED NOVEMBER 2005
TPS77015 TPS77015LINE TRANSIENT RESPONSE LOAD TRANSIENT RESPONSE
Figure 13. Figure 14.
TPS77033 TPS77033LINE TRANSIENT RESPONSE LOAD TRANSIENT RESPONSE
Figure 15. Figure 16.
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1
025 50
100
IO−Output Current −mA
ESR −Equivalent Series Resistance −Ω
10
VIN= 4.3 V
CO= 4.7 µF
ESR = 0.3 Ω
3.3 V LDO
510 15 20 30 35 40 45
Region of Instability
Region of Stability
0.1
00.1 0.2 0.3 0.4 0.5
Added Ceramic Capacitance −
µF
0.6 0.7 0.8 0.9 1
1
100
ESR −Equivalent Series Resistance −Ω
10
Region of Instability
Region of Stability
VIN= 4.3 V
CO= 4.7 µF
IL= 50 mA
Added Ceramic Capacitance −µF
00.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
1
100
ESR −Equivalent Series Resistance −Ω
10
Region of Instability
Region of Stability
VIN= 4.3 V
CO= 10 µF
IL= 50 mA
TPS77001-Q1, TPS77012-Q1, TPS77015-Q1, TPS77018-Q1, TPS77025-Q1TPS77027-Q1, TPS77028-Q1, TPS77030-Q1, TPS77033-Q1, TPS77050-Q1ULTRALOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS
SLVS596A – AUGUST 2005 – REVISED NOVEMBER 2005
TPS77033 TPS77033TYPICAL REGIONS OF STABILITY TYPICAL REGIONS OF STABILITYEQUIVALENT SERIES RESISTANCE (ESR) EQUIVALENT SERIES RESISTANCE (ESR)vs vsOUTPUT CURRENT ADDED CERAMIC CAPACITANCE
Figure 17. Figure 18.
TPS77033 TPS77033TYPICAL REGIONS OF STABILITY TYPICAL REGIONS OF STABILITYEQUIVALENT SERIES RESISTANCE (ESR) EQUIVALENT SERIES RESISTANCE (ESR)vs vsOUTPUT CURRENT ADDED CERAMIC CAPACITANCE
Figure 19. Figure 20.
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APPLICATION INFORMATION
Device Operation
C1
1µF
NC/FB
OUT
1
3
IN
EN
GND
2
4
5
VI
ESR = 0.2 Ω
VO
4.7 µF
+
TPS77001-Q1, TPS77012-Q1, TPS77015-Q1, TPS77018-Q1, TPS77025-Q1TPS77027-Q1, TPS77028-Q1, TPS77030-Q1, TPS77033-Q1, TPS77050-Q1ULTRALOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS
SLVS596A – AUGUST 2005 – REVISED NOVEMBER 2005
The TPS770xx family of low-dropout (LDO) regulators has been optimized for use in battery-operated equipment.They feature extremely low-dropout voltages, low quiescent current (17 µA nominally), and enable inputs toreduce supply currents to less than 1 µA when the regulators are turned off.
The TPS770xx uses a PMOS pass element to dramatically reduce both dropout voltage and supply current overmore conventional PNP-pass-element LDO designs. The PMOS pass element is a voltage-controlled device and,unlike a PNP transistor, does not require increased drive current as output current increases. Supply current inthe TPS770xx essentially is 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 outputvoltage instead of increasing the output current. The thermal protection shuts the regulator off if the junctiontemperature rises above approximately 165 °C. Recovery is automatic when the junction temperature dropsapproximately 25 °C below the high-temperature trip point. The PMOS pass element includes a back-gate diodethat 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 disables the TPS770xx internal circuitry, reducing the supplycurrent to 1 µA. A voltage of less than 0.9 V on the EN input enables the TPS770xx and enables normaloperation to resume. The EN input does not include any deliberate hysteresis, and it exhibits an actual switchingthreshold of approximately 1.5 V.
A typical application circuit is shown in Figure 21 .
TPS770xx
(1)
(1) TPS77012, TPS77015, TPS77018, TPS77025, TPS77027, TPS77028, TPS77030, TPS77033, TPS77050(fixed-voltage options)
Figure 21. Typical Application Circuit
12
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External Capacitor Requirements
Output Voltage Programming
R1
R2
V = V 1 +
O ref ´
(
(
(1)
R1 =
(
(
–1
VO
Vref
´R2
(2)
VO
VI
OUT
FB
R2
GND
EN
IN
≤0.9 V
≥1.7 V
TPS77001
1µF
OUTPUT
VOLTAGE
(V) R1 R2
2.5
3.3
3.6
4.0
5.0
174
287
324
383
523
169
169
169
169
169
OUTPUT VOLTAGE
PROGRAMMING GUIDE
DIVIDER RESISTANCE
(kΩ)(1)
(1) 1% values shown.
3
1
4
2
R1
5
ESR = 0.2 Ω
4.7 µF
TPS77001-Q1, TPS77012-Q1, TPS77015-Q1, TPS77018-Q1, TPS77025-Q1TPS77027-Q1, TPS77028-Q1, TPS77030-Q1, TPS77033-Q1, TPS77050-Q1ULTRALOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS
SLVS596A – AUGUST 2005 – REVISED NOVEMBER 2005
APPLICATION INFORMATION (continued)
Although not required, a 0.047- µF or larger ceramic input bypass capacitor, connected between IN and GND andlocated close to the TPS770xx, is recommended to improve transient response and noise rejection. Ahigher-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 TPS770xx requires an output capacitor connected between OUT and GND tostabilize the internal control loop. The minimum recommended capacitance is 4.7 µF. The ESR (equivalent seriesresistance) of the capacitor should be between 0.2 Ωand 10 Ω. to ensure stability. Capacitor values larger than4.7 µF are acceptable and allow the use of smaller ESR values. Capacitances less than 4.7 µF are notrecommended 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 requirementspreviously described. 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. Multilayerceramic capacitors may have very small equivalent series resistances and may thus require the addition of alow-value series resistor to ensure stability.
CAPACITOR SELECTION
PART NO. MFR. VALUE MAX ESR
(1)
SIZE (H ×L×W)
(1)
T494B475K016AS KEMET 4.7 µF 1.5 Ω1.9 ×3.5 ×2.8195D106x0016x2T SPRAGUE 10 µF 1.5 Ω1.3 ×7.0 ×2.7695D106x003562T SPRAGUE 10 µF 1.3 Ω2.5 ×7.6 ×2.5TPSC475K035R0600 AVX 4.7 µF 0.6 Ω2.6 ×6.0 ×3.2
(1) Size is in mm. ESR is maximum resistance in Ohms at 100 kHz and T
A
= 25 °C. Contact manufacturerfor minimum ESR values.
The output voltage of the TPS77001 adjustable regulator is programmed using an external resistor divider asshown in Figure 22 . The output voltage is calculated using Equation 1 :
where
Figure 22. TPS77001 Adjustable LDO Regulator Programming
13
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Power Dissipation and Junction Temperature
P =
D(max)
T max –T
J A
RqJA
(3)
P = (V –V ) I
D I O O
´
(4)
Regulator Protection
TPS77001-Q1, TPS77012-Q1, TPS77015-Q1, TPS77018-Q1, TPS77025-Q1TPS77027-Q1, TPS77028-Q1, TPS77030-Q1, TPS77033-Q1, TPS77050-Q1ULTRALOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS
SLVS596A – AUGUST 2005 – REVISED NOVEMBER 2005
Specified regulator operation is assured to a junction temperature of 125 °C; the maximum junction temperatureshould be restricted to 125 °C under normal operating conditions. This restriction limits the power dissipation theregulator can handle in any given application. To ensure the junction temperature is within acceptable limits,calculate the maximum allowable dissipation, P
D(max)
, and the actual dissipation, P
D
, which must be less than orequal to P
D(max)
.
The maximum power dissipation limit is determined using Equation 3 :
where
T
J
max = maximum allowable junction temperature
R
θJA
= junction-to-ambient thermal resistance for the package (see Dissipation Rating)
T
A
= ambient temperature
The regulator dissipation is calculated using Equation 4 :
Power dissipation resulting from quiescent current is negligible. Excessive power dissipation triggers the thermalprotection circuit.
The TPS770xx PMOS-pass transistor has a built-in back diode that conducts reverse current when the inputvoltage drops below the output voltage (e.g., during power down). Current is conducted from the output to theinput and is not internally limited. If extended reverse voltage operation is anticipated, external limiting might beappropriate.
The TPS770xx features internal current limiting and thermal protection. During normal operation, the TPS770xxlimits output current to approximately 350 mA. When current limiting engages, the output voltage scales backlinearly 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 deviceexceeds approximately 165 °C, thermal-protection circuitry shuts it down. Once the device has cooled down tobelow approximately 140 °C, regulator operation resumes.
14
PACKAGING INFORMATION
Orderable Device Status (1) Package
Type Package
Drawing Pins Package
Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
TPS77033QDBVRQ1 ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
(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) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
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reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
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In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
PACKAGE OPTION ADDENDUM
www.ti.com 27-Feb-2006
Addendum-Page 1
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