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FEATURES DESCRIPTION
APPLICATIONS
3
2
4
5
DBV PACKAGE
(TOP VIEW)
1IN
GND
EN
OUT
NR
Fixed Option
3
2
4
6
DBV PACKAGE
(TOP VIEW)
1
IN
GND
EN
OUT
NR
5FB
Adjustable Option
TPS79328
RIPPLE REJECTION
vs
FREQUENCY
IN
EN
OUT
NR
GND
YEQ
PACKAGE
(TOP VIEW)
10 100 1 k 10 k
10
40
80
100 k 1 M 10 M
Ripple Rejection (dB)
Frequency (Hz)
IOUT = 10 mA
50
0
VIN = 3.8 V
COUT = 10 µF
CNR = 0.01 µF
IOUT = 200 mA
20
30
60
70
90
100
A3 A1
C3 C1
B2
0
0.05
0.10
0.15
0.20
0.25
0.30
100 1 k 10 k 100 k
Frequency (Hz)
IOUT = 1 mA
VIN = 3.8 V
COUT = 2.2 µF
CNR = 0.1 µF
IOUT = 200 mA
TPS79328
OUTPUT SPECTRAL NOISE DENSITY
vs
FREQUENCY
Output Spectral Noise Density (µV/Hz)
TPS79301, TPS79318TPS79325, TPS79328, TPS793285TPS79330, TPS79333, TPS793475
SLVS348H JULY 2001 REVISED OCTOBER 2004
ULTRALOW-NOISE, HIGH PSRR, FAST RF 200-mA LOW-DROPOUT LINEARREGULATORS IN NanoStar™ WAFER CHIP SCALE AND SOT23
200-mA RF Low-Dropout Regulator
The TPS793xx family of low-dropout (LDO)With Enable
low-power linear voltage regulators features highpower-supply rejection ratio (PSRR), ultralow-noise,Available in 1.8-V, 2.5-V, 2.8-V, 2.85-V, 3-V,
fast start-up, and excellent line and load transient3.3-V, 4.75-V, and Adjustable (1.22-V to 5.5-V)
responses in NanoStar wafer chip scale and SOT23High PSRR (70 dB at 10 kHz)
packages. NanoStar packaging gives an ultrasmallUltralow-Noise (32 µV
RMS
, TPS79328)
footprint as well as an ultralow profile and packageweight, making it ideal for portable applications suchFast Start-Up Time (50 µs)
as handsets and PDAs. Each device in the family isStable With a 2.2-µF Ceramic Capacitor
stable, with a small 2.2-µF ceramic capacitor on theExcellent Load/Line Transient Response
output. The TPS793xx family uses an advanced,proprietary BiCMOS fabrication process to yield ex-Very Low Dropout Voltage (112 mV at Full
tremely low dropout voltages (e.g., 112 mV atLoad, TPS79330)
200 mA, TPS79330). Each device achieves fast5- and 6-Pin SOT23 (DBV) and NanoStar Wafer
start-up times (approximately 50 µs with a 0.001-µFChip Scale (YEQ) Packages
bypass capacitor) while consuming very low quiesc-ent current (170 µA typical). Moreover, when thedevice is placed in standby mode, the supply currentRF: VCOs, Receivers, ADCs is reduced to less than 1 µA. The TPS79328 exhibitsapproximately 32 µV
RMS
of output voltage noise atAudio
2.8-V output with a 0.1-µF bypass capacitor. Appli-Cellular and Cordless Telephones
cations with analog components that areBluetooth™, Wireless LAN
noise-sensitive, such as portable RF electronics,Handheld Organizers, PDAs
benefit from the high PSRR and low-noise featuresas well as the fast response time.
Figure 1.
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.Bluetooth is a trademark of Bluetooth Sig, Inc.NanoStar is a trademark of Texas Instruments.
UNLESS OTHERWISE NOTED this document contains PRO-
Copyright © 2001–2004, Texas Instruments IncorporatedDUCTION DATA information current as of publication date. Prod-ucts conform to specifications per the terms of Texas Instrumentsstandard warranty. Production processing does not necessarilyinclude testing of all parameters.
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ABSOLUTE MAXIMUM RATINGS
TPS79301, TPS79318TPS79325, TPS79328, TPS793285TPS79330, TPS79333, TPS793475
SLVS348H JULY 2001 REVISED OCTOBER 2004
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integratedcircuits be handled with appropriate precautions. Failure to observe proper handling and installationprocedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precisionintegrated circuits may be more susceptible to damage because very small parametric changes couldcause the device not to meet its published specifications.
AVAILABLE OPTIONS
(1) (2)
PRODUCT VOLTAGE PACKAGE T
J
SYMBOL PART NUMBER
TPS79301 1.22 V to 5.5 V SOT23 (DBV) PGVI TPS79301DBVRSOT23 (DBV) PHHI TPS79318DBVRTPS79318 1.8 V
CSP (YEQ) E3 TPS79318YEQSOT23 (DBV) PGWI TPS79325DBVRTPS79325 2.5 V
CSP (YEQ) E4 TPS79325YEQSOT23 (DBV) PGXI TPS79328DBVRTPS79328 2.8 V
CSP (YEQ) -40 °C to +125 °C E2 TPS79328YEQSOT23 (DBV) PHII TPS793285DBVRTPS793285 2.85 V
CSP (YEQ) E5 TPS793285YEQSOT23 (DBV) PGYI TPS79330DBVRTPS79330 3 V
CSP (YEQ) E6 TPS79330YEQTPS79333 3.3 V SOT23 (DBV) PHUI TPS79333DBVRTPS793475 4.75 V SOT23 (DBV) PHJI TPS793475DBVR
(1) For the most current package and ordering information, see the Package Option Addendum located at the end of this data sheet.(2) DBV Rindicates tape and reel of 3000 parts. YEQ Rindicates tape and reel of 3000 parts. YEQ Tindicates tape and reel of 250 parts.
over operating temperature range (unless otherwise noted)
(1)
UNIT
V
IN
range -0.3 V to 6 VV
EN
range -0.3 V to V
IN
+ 0.3 VV
OUT
range -0.3 V to 6 VPeak output current Internally limitedESD rating, HBM 2 kVESD rating, CDM 500 VContinuous total power dissipation See Dissipation Ratings TableJunction temperature range, DBV package -40 °C to 150 °CJunction temperature range, YEQ package -40 °C to 125 °CStorage temperature range, T
stg
-65 °C to 150 °C
(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
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DISSIPATION RATINGS TABLE
ELECTRICAL CHARACTERISTICS
TPS79301, TPS79318TPS79325, TPS79328, TPS793285TPS79330, TPS79333, TPS793475
SLVS348H JULY 2001 REVISED OCTOBER 2004
T
A
25 °C T
A
= 70 °C T
A
= 85 °CDERATING FACTOR POWER POWER POWERBOARD PACKAGE R
θJC
R
θJA
ABOVE T
A
= 25 °C RATING RATING RATING
Low-K
(1)
DBV 65 °C/W 255 °C/W 3.9 mW/ °C 390 mW 215 mW 155 mWHigh-K
(2)
DBV 65 °C/W 180 °C/W 5.6 mW/ °C 560 mW 310 mW 225 mWLow-K
(1)
YEQ 27 °C/W 255 °C/W 3.9 mW/ °C 390 mW 215 mW 155 mWHigh-K
(2)
YEQ 27 °C/W 190 °C/W 5.3 mW/ °C 530 mW 296 mW 216 mW
(1) 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 topof the board.(2) 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 andground planes and 2 ounce copper traces on top and bottom of the board.
over recommended operating temperature range T
J
= -40 to 125 °C, V
EN
= V
IN
, V
IN
= V
OUT(nom)
+ 1 V
(1)
, I
OUT
= 1 mA,C
OUT
= 10 µF, C
NR
= 0.01 µF (unless otherwise noted). Typical values are at 25 °C.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
IN
Input voltage
(1)
2.7 5.5 VI
OUT
Continuous output current 0 200 mAV
FB
Internal reference (TPS79301) 1.201 1.225 1.250 VOutput voltage range (TPS79301) V
FB
5.5 - V
DO
VTPS79318 0 µA < I
OUT
< 200 mA, 2.8 V < V
IN
< 5.5 V 1.764 1.8 1.836 VTPS79325 0 µA < I
OUT
< 200 mA, 3.5 V < V
IN
< 5.5 V 2.45 2.5 2.55 VTPS79328 0 µA < I
OUT
< 200 mA, 3.8 V < V
IN
< 5.5 V 2.744 2.8 2.856 VOutput voltage TPS793285 0 µA < I
OUT
< 200 mA, 3.85 V < V
IN
< 5.5 V 2.793 2.85 2.907 VTPS79330 0 µA < I
OUT
< 200 mA, 4 V < V
IN
< 5.5 V 2.94 3 3.06 VTPS79333 0 µA I
OUT
< 200 mA, 4.3 V < V
IN
< 5.5 V 3.234 3.3 3.366 VTPS793475 0 µA < I
OUT
< 200 mA, 5.25 V < V
IN
< 5.5 V 4.655 4.75 4.845 VLine regulation ( V
OUT
%/ V
IN
)
(1)
V
OUT
+ 1 V < V
IN
5.5 V 0.05 0.12 %/VLoad regulation ( V
OUT
%/ I
OUT
) 0 µA < I
OUT
< 200 mA, T
J
= 25 °C 5 mVTPS79328 I
OUT
= 200 mA 120 200TPS793285 I
OUT
= 200 mA 120 200Dropout voltage
(2)
TPS79330 I
OUT
= 200 mA 112 200 mV(V
IN
= V
OUT(nom)
- 0.1V)
TPS79333 I
OUT
= 200 mA 102 180TPS793475 I
OUT
= 200 mA 77 125Output current limit V
OUT
= 0 V 285 600 mAGND pin current 0 µA < I
OUT
< 200 mA 170 220 µAShutdown current
(3)
V
EN
= 0 V, 2.7 V < V
IN
< 5.5 V 0.07 1 µAFB pin current V
FB
= 1.8 V 1 µAf = 100 Hz, T
J
= 25 °C, I
OUT
= 10 mA 70f = 100 Hz, T
J
= 25 °C, I
OUT
= 200 mA 68Power-supply ripple rejection TPS79328 dBf = 10 kHz, T
J
= 25 °C, I
OUT
= 200 mA 70f = 100 kHz, T
J
= 25 °C, I
OUT
= 200 mA 43C
NR
= 0.001 µF 55C
NR
= 0.0047 µF 36BW = 200 Hz to 100 kHz,Output noise voltage (TPS79328) µV
RMSI
OUT
= 200 mA
C
NR
= 0.01 µF 33C
NR
= 0.1 µF 32
(1) Minimum V
IN
is 2.7 V or V
OUT
+ V
DO
, whichever is greater.(2) Dropout is not measured for the TPS79318 and TPS79325 since minimum V
IN
= 2.7 V.(3) For adjustable versions, this applies only after V
IN
is applied; then V
EN
transitions high to low.
3
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TPS79301, TPS79318TPS79325, TPS79328, TPS793285TPS79330, TPS79333, TPS793475
SLVS348H JULY 2001 REVISED OCTOBER 2004
ELECTRICAL CHARACTERISTICS (continued)over recommended operating temperature range T
J
= -40 to 125 °C, V
EN
= V
IN
, V
IN
= V
OUT(nom)
+ 1 V, I
OUT
= 1 mA,C
OUT
= 10 µF, C
NR
= 0.01 µF (unless otherwise noted). Typical values are at 25 °C.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
C
NR
= 0.001 µF 50Time, start-up (TPS79328) R
L
= 14 , C
OUT
= 1 µF C
NR
= 0.0047 µF 70 µsC
NR
= 0.01 µF 100High level enable input voltage 2.7 V < V
IN
< 5.5 V 1.7 V
IN
VLow level enable input voltage 2.7 V < V
IN
< 5.5 V 0 0.7 VEN pin current V
EN
= 0 -1 1 µAUVLO threshold V
CC
rising 2.25 2.65 VUVLO hysteresis 100 mV
4
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FUNCTIONAL BLOCK DIAGRAMS
ADJUSTABLE VERSION
_+
Thermal
Shutdown
Bandgap
Reference
1.22V
Current
Sense
R2
GND
EN
SHUTDOWN
Vref
UVLO
ILIM
External to
the Device
R1
UVLO
2.45V
250 kNR
FB
59 k
QuickStart
OUTIN
IN
FIXED VERSION
_+
Thermal
Shutdown
Current
Sense
R1
R2
GND
EN
SHUTDOWN
Vref
UVLO
ILIM
250 kNR
QuickStart
Bandgap
Reference
1.22V
UVLO
2.45V
R2 = 40 k
IN
IN OUT
TPS79301, TPS79318TPS79325, TPS79328, TPS793285TPS79330, TPS79333, TPS793475
SLVS348H JULY 2001 REVISED OCTOBER 2004
Terminal Functions
TERMINAL
DESCRIPTIONSOT23 SOT23 WCSPNAME
ADJ FIXED FIXED
Connecting an external capacitor to this pin bypasses noise generated by the internal bandgap.NR 4 4 B2
This improves power-supply rejection and reduces output noise.Driving the enable pin (EN) high turns on the regulator. Driving this pin low puts the regulator intoEN 3 3 A3
shutdown mode. EN can be connected to IN if not used.FB 5 N/A N/A This terminal is the feedback input voltage for the adjustable device.GND 2 2 A1 Regulator groundIN 1 1 C3 Unregulated input to the device.OUT 6 5 C1 Output of the regulator.
5
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TYPICAL CHARACTERISTICS (SOT23 PACKAGE)
2.795
2.796
2.797
2.798
2.799
2.800
2.801
2.802
2.803
2.804
2.805
0 50 100 150 200
IOUT (mA)
VIN = 3.8 V
COUT = 10 µF
TJ = 25°C
VOUT (V)
0
50
100
150
200
250
−40−25−10 5 20 35 50 65 80 95 110 125
TJ (°C)
IOUT = 1 mA
VIN = 3.8 V
COUT = 10 µF
IOUT = 200 mA
IGND (µA)
0
0.05
0.10
0.15
0.20
0.25
0.30
100 1 k 10 k 100 k
Frequency (Hz)
IOUT = 1 mA
VIN = 3.8 V
COUT = 2.2 µF
CNR = 0.1 µF
IOUT = 200 mA
Output Spectral Noise Density (µV/Hz)
0
0.05
0.10
0.15
0.20
0.25
0.30
100 1 k 10 k 100 k
Frequency (Hz)
IOUT = 1 mA
IOUT = 200 mA
VIN = 3.8 V
COUT = 10 µF
CNR = 0.1 µF
Output Spectral Noise Density (µV/Hz)
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
100 1 k 10 k 100 k
Frequency (Hz)
VIN = 3.8 V
IOUT = 200 mA
COUT = 10 µF
CNR = 0.1 µF
CNR = 0.001 µF
CNR = 0.0047 µF
CNR = 0.01 µF
Output Spectral Noise Density (µV/Hz)
100 1 M10 1 k
Frequency (Hz)
10 k 100 k
IOUT = 1 mA
0
0.5
1.0
1.5
2.0
2.5
0
IOUT = 100 mA
10 M
VIN = 3.8 V
COUT = 10 µF
TJ = 25° C
ZO ()
0
20
40
60
80
100
120
140
160
180
−40−25−10 5 20 35 50 65 80 95 110 125
IOUT = 200 mA
IOUT = 10 mA
VIN = 2.7 V
COUT = 10 µF
TJ (°C)
VDO (mV)
0.001 0.01 0.1
CNR (µF)
0
10
20
30
40
50
60 VOUT = 2.8 V
IOUT = 200 mA
COUT = 10 µF
BW = 100 Hz to 100 kHz
RMS, Output Noise (VRMS)
TPS79301, TPS79318TPS79325, TPS79328, TPS793285TPS79330, TPS79333, TPS793475
SLVS348H JULY 2001 REVISED OCTOBER 2004
TPS79328 TPS79328 TPS79328OUTPUT VOLTAGE OUTPUT VOLTAGE GROUND CURRENTvs vs vsOUTPUT CURRENT JUNCTION TEMPERATURE JUNCTION TEMPERATURE
Figure 2. Figure 3. Figure 4.
TPS79328 OUTPUT SPECTRAL TPS79328 OUTPUT SPECTRAL TPS79328 OUTPUT SPECTRALNOISE DENSITY NOISE DENSITY NOISE DENSITYvs vs vsFREQUENCY FREQUENCY FREQUENCY
Figure 5. Figure 6. Figure 7.
ROOT MEAN SQUARE OUTPUT TPS79328NOISE OUTPUT IMPEDANCE DROPOUT VOLTAGEvs vs vsC
NR
FREQUENCY JUNCTION TEMPERATURE
Figure 8. Figure 9. Figure 10.
6
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10 100 1 k 10 k
10
40
80
100 k 1 M 10 M
Ripple Rejection (dB)
Frequency (Hz)
IOUT = 10 mA
50
0
VIN = 3.8 V
COUT = 10 µF
CNR = 0.01 µF
IOUT = 200 mA
20
30
60
70
90
100
10 100 1 k 10 k
20
60
100
100 k 1 M 10 M
Ripple Rejection (dB)
Frequency (Hz)
VIN = 3.8 V
COUT = 2.2 µF
CNR = 0.01 µF
IOUT = 10 mA
IOUT = 200 mA
40
70
90
30
50
80
10
0
10 100 1 k 10 k
20
60
100
100 k 1 M 10 M
Ripple Rejection (dB)
Frequency (Hz)
VIN = 3.8 V
COUT = 2.2 µF
CNR = 0.1 µF
IOUT = 10 mA
IOUT = 200 mA
40
70
90
30
50
80
10
0
3
Time (µs)
0 604020 80 100 140120 160 180 200
VIN = 3.8 V
VOUT = 2.8 V
IOUT = 200 mA
COUT = 2.2 µF
TJ = 25°C
1
2
0
0
2CNR = 0.0047 µF
CNR = 0.01 µF
4
CNR = 0.001 µF
VEN (V)VOUT (V)
Time (µs)
0 302010 40 50 7060 80 90 100
IOUT = 200 mA
COUT = 2.2 µF
CNR = 0.01 µF
0
-20
3.8
dv
dt 0.4 V
µs
20
4.8
VIN (mV) VOUT (mV)
Time (µs)
0
0 15010050 200 250 350300 400 450
20
0
−20
100
500
VIN = 3.8 V
COUT = 10 µF
−40
200
300 di
dt 0.02A
µs
1mA
IOUT (mA) VOUT (mV)
500 mV/div
1s/div
VIN VOUT
VOUT = 3 V
RL = 15
100
50
0 20 40 60 80 100 120
150
200
250
140 160 180 200
0
IOUT (mA)
TJ = 125°C
TJ = 25°C
TJ = −55°C
VDO (mV)
0
50
100
150
200
2.5 3.0 3.5 4.0 4.5 5.0
VIN (V)
IOUT = 200 mA
TJ = 25°C
TJ = −40°C
TJ = 125°C
VDO (mV)
TPS79301, TPS79318TPS79325, TPS79328, TPS793285TPS79330, TPS79333, TPS793475
SLVS348H JULY 2001 REVISED OCTOBER 2004
TYPICAL CHARACTERISTICS (SOT23 PACKAGE) (continued)
TPS79328 TPS79328 TPS79328RIPPLE REJECTION RIPPLE REJECTION RIPPLE REJECTIONvs vs vsFREQUENCY FREQUENCY FREQUENCY
Figure 11. Figure 12. Figure 13.
TPS79328 OUTPUT VOLTAGE,ENABLE VOLTAGE
vs TPS79328 TPS79328TIME (START-UP) LINE TRANSIENT RESPONSE LOAD TRANSIENT RESPONSE
Figure 14. Figure 15. Figure 16.
TPS79301DROPOUT VOLTAGE DROPOUT VOLTAGEvs vsPOWER-UP / POWER-DOWN OUTPUT CURRENT INPUT VOLTAGE
Figure 17. Figure 18. Figure 19.
7
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0.01
0.1
10
100
0 0.02 0.04 0.06 0.08 0.20
IOUT (A)
1
Region of Instability
Region of Stability
COUT = 2.2 µF
VIN = 5.5 V, VOUT 1.5 V
TJ = −40°C to 125°C
ESR, Equivalent Series Resistance ()
0.01
0.1
10
100
0 0.02 0.04 0.06 0.08 0.20
IOUT (A)
1
Region of Instability
Region of Stability
COUT = 10 µF
VIN = 5.5 V
TJ = −40°C to 125°C
ESR, Equivalent Series Resistance ()
TPS79301, TPS79318TPS79325, TPS79328, TPS793285TPS79330, TPS79333, TPS793475
SLVS348H JULY 2001 REVISED OCTOBER 2004
TYPICAL CHARACTERISTICS (SOT23 PACKAGE) (continued)
TYPICAL REGIONS OF STABILITY TYPICAL REGIONS OF STABILITYEQUIVALENT SERIES RESISTANCE EQUIVALENT SERIES RESISTANCE(ESR) (ESR)vs vsOUTPUT CURRENT OUTPUT CURRENT
Figure 20. Figure 21.
8
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APPLICATION INFORMATION
VIN
VOUT
TPS793xx
GNDEN NR
IN OUT
VIN VOUT
0.1µF
0.01µF
2.2µF
External Capacitor Requirements
Board Layout Recommendation to Improve PSRR and Noise Performance
TPS79301, TPS79318TPS79325, TPS79328, TPS793285TPS79330, TPS79333, TPS793475
SLVS348H JULY 2001 REVISED OCTOBER 2004
The TPS793xx family of low-dropout (LDO) regulators has been optimized for use in noise-sensitivebattery-operated equipment. The device features extremely low dropout voltages, high PSRR, ultralow outputnoise, low quiescent current (170 µA typically), and enable-input to reduce supply currents to less than 1 µAwhen the regulator is turned off.
A typical application circuit is shown in Figure 22 .
Figure 22. Typical Application Circuit
A 0.1-µF or larger ceramic input bypass capacitor, connected between IN and GND and located close to theTPS793xx, is required for stability and improves transient response, noise rejection, and ripple rejection. Ahigher-value input capacitor may be necessary if large, fast-rise-time load transients are anticipated or the deviceis located several inches from the power source.
Like most low dropout regulators, the TPS793xx requires an output capacitor connected between OUT and GNDto stabilize the internal control loop. The minimum recommended capacitance is 2.2 µF. Any 2.2-µF or largerceramic capacitor is suitable, provided the capacitance does not vary significantly over temperature. If loadcurrent is not expected to exceed 100 mA, a 1.0-µF ceramic capacitor can be used.
The internal voltage reference is a key source of noise in an LDO regulator. The TPS793xx has an NR pin whichis connected to the voltage reference through a 250-k internal resistor. The 250-k internal resistor, inconjunction with an external bypass capacitor connected to the NR pin, creates a low pass filter to reduce thevoltage reference noise and, therefore, the noise at the regulator output. In order for the regulator to operateproperly, the current flow out of the NR pin must be at a minimum, because any leakage current creates an IRdrop across the internal resistor thus creating an output error. Therefore, the bypass capacitor must haveminimal leakage current. The bypass capacitor should be no more than 0.1-µF to ensure that it is fully chargedduring the quickstart time provided by the internal switch shown in the Functional Block Diagrams
As an example, the TPS79328 exhibits only 32 µV
RMS
of output voltage noise using a 0.1-µF ceramic bypasscapacitor and a 2.2-µF ceramic output capacitor. Note that the output starts up slower as the bypass capacitanceincreases due to the RC time constant at the NR pin that is created by the internal 250-k resistor and externalcapacitor.
To improve ac measurements like PSRR, output noise, and transient response, it is recommended that the boardbe designed with separate ground planes for V
IN
and V
OUT
, with each ground plane connected only at the GNDpin of the device. In addition, the ground connection for the bypass capacitor should connect directly to the GNDpin of the device.
9
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Power Dissipation and Junction Temperature
PD(max)TJmaxTA
RJA
(1)
PDVINVOUTIOUT
(2)
Programming the TPS79301 Adjustable LDO Regulator
VOUT VREF 1R1
R2
(3)
R1VOUT
Vref 1R2
(4)
C1(3 x 107) x (R1R2)
(R1x R2)
(5)
TPS79301, TPS79318TPS79325, TPS79328, TPS793285TPS79330, TPS79333, TPS793475
SLVS348H JULY 2001 REVISED OCTOBER 2004
APPLICATION INFORMATION (continued)
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 1 :
Where:
T
J
max is the maximum allowable junction temperature.R
θJA
is the thermal resistance junction-to-ambient for the package (see the Dissipation Ratings Table).T
A
is the ambient temperature.
The regulator dissipation is calculated using Equation 2 :
Power dissipation resulting from quiescent current is negligible. Excessive power dissipation triggers the thermalprotection circuit.
The output voltage of the TPS79301 adjustable regulator is programmed using an external resistor divider asshown in Figure 23 . The output voltage is calculated using Equation 3 :
Where:
V
REF
= 1.2246 V typ (the internal reference voltage)
Resistors R1 and R2 should be chosen for approximately 50-µA divider current. Lower value resistors can beused for improved noise performance, but the solution consumes more power. Higher resistor values should beavoided as leakage current into/out of FB across R1/R2 creates an offset voltage that artificially in-creases/decreases the feedback voltage and thus erroneously decreases/increases V
OUT
. The recommendeddesign procedure is to choose R2 = 30.1 k to set the divider current at 50 µA, C1 = 15 pF for stability, and thencalculate R1 using Equation 4 :
In order to improve the stability of the adjustable version, it is suggested that a small compensation capacitor beplaced between OUT and FB. For voltages <1.8 V, the value of this capacitor should be 100 pF. For voltages>1.8 V, the approximate value of this capacitor can be calculated as shown in Equation 5 :
The suggested value of this capacitor for several resistor ratios is shown in the table below. If this capacitor isnot used (such as in a unity-gain configuration) or if an output voltage <1.8 V is chosen, then the minimumrecommended output capacitor is 4.7 µF instead of 2.2 µF.
10
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22 pF
15 pF
15 pF
OUTPUT VOLTAGE
PROGRAMMING GUIDE
OUTPUT
VOLTAGE R1 R2
2.5 V
3.3 V
3.6 V
C1
31.6 k
51 k
59 k
30.1 k
30.1 k
30.1 k
0 pF1.22 V short open
TPS793xx
GNDNR FB
IN OUT
EN
VIN VOUT
R1 C1
R2
1µF1µF
0.01 µF
Regulator Protection
TPS79301, TPS79318TPS79325, TPS79328, TPS793285TPS79330, TPS79333, TPS793475
SLVS348H JULY 2001 REVISED OCTOBER 2004
APPLICATION INFORMATION (continued)
Figure 23. TPS79301 Adjustable LDO Regulator Programming
The TPS793xx 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 TPS793xx features internal current limiting and thermal protection. During normal operation, the TPS793xxlimits output current to approximately 400 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 or the absolute maximumvoltage ratings of the device. If the temperature of the device exceeds approximately 165 °C, thermal-protectioncircuitry shuts it down. Once the device has cooled down to below approximately 140 °C, regulator operationresumes.
11
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TPS793xxYEQ NanoStar Wafer Chip Scale Information
0.625 Max
NOTES:A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
C. NanoStar package configuration.
D. This package is tin-lead (SnPb); consult the factory for availability of lead-free material.
NanoStar is a trademark of Texas Instruments.
1,30
1,34
0,79
0,84
TPS79301, TPS79318TPS79325, TPS79328, TPS793285TPS79330, TPS79333, TPS793475
SLVS348H JULY 2001 REVISED OCTOBER 2004
Figure 24. NanoStar Wafer Chip Scale Package
12
PACKAGING INFORMATION
Orderable Device Status (1) Package
Type Package
Drawing Pins Package
Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
TPS79301DBVR ACTIVE SOT-23 DBV 6 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS79301DBVRG4 ACTIVE SOT-23 DBV 6 3000 None Call TI Call TI
TPS79318DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS79318DBVRG4 ACTIVE SOT-23 DBV 5 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS79318DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS79318YEQR ACTIVE DSBGA YEQ 5 3000 None Call TI Level-1-240C-UNLIM
TPS79318YEQT ACTIVE DSBGA YEQ 5 250 None Call TI Level-1-240C-UNLIM
TPS79325DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS79325DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS79325YEQR ACTIVE DSBGA YEQ 5 3000 None Call TI Level-1-240C-UNLIM
TPS79325YEQT ACTIVE DSBGA YEQ 5 250 None Call TI Level-1-240C-UNLIM
TPS793285DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS793285DBVRG4 ACTIVE SOT-23 DBV 5 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS793285DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS793285YEQR ACTIVE DSBGA YEQ 5 3000 None Call TI Level-1-240C-UNLIM
TPS793285YEQT ACTIVE DSBGA YEQ 5 250 None Call TI Level-1-240C-UNLIM
TPS79328DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS79328DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS79328YEQR ACTIVE DSBGA YEQ 5 3000 None Call TI Level-1-240C-UNLIM
TPS79328YEQT ACTIVE DSBGA YEQ 5 250 None Call TI Level-1-240C-UNLIM
TPS79330DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS79330DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS79330YEQR ACTIVE DSBGA YEQ 5 3000 None Call TI Level-1-240C-UNLIM
TPS79330YEQT ACTIVE DSBGA YEQ 5 250 None Call TI Level-1-240C-UNLIM
TPS79333DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS79333DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS793475DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS793475DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
PACKAGE OPTION ADDENDUM
www.ti.com 28-Feb-2005
Addendum-Page 1
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 - May not be currently available - please check http://www.ti.com/productcontent for the latest availability information and additional
product content details.
None: Not yet available Lead (Pb-Free).
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.
Green (RoHS & no Sb/Br): TI defines "Green" to mean "Pb-Free" and in addition, uses package materials that do not contain halogens,
including bromine (Br) or antimony (Sb) above 0.1% of total product weight.
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDECindustry 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
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
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 28-Feb-2005
Addendum-Page 2
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