1
FEATURES
1
2
3
45
6
7
8
IN
IN
OUT
OUT
EN
GND
PG
FB
D PACKAGE
(TOP VIEW)
DESCRIPTION/ORDERING INFORMATION
TA − Free-Air Temperature − °C
TPS76533
DROPOUT VOLTAGE
vs
FREE-AIR TEMPERATURE
−50 −25 0 25 50 75 100 125 150
VI = 3.2 V
IO = 10 mA
IO = 50 mA
IO = 150 mA
100
10−1
10−2
10−3
− Output Voltage − V
VDO
34.0
34.1
34.2
34.3
34.4
34.5
34.6
34.7
34.8
34.9
35.0
0 25 50 75 100 125 150
IL − Load Current − mA
TPS76533
GROUND CURRENT
vs
LOAD CURRENT
VO = 3.3 V
TA = 25°C
GND
I− Ground Current − Aµ
TPS76501-Q1ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT
VOLTAGE REGULATOR
SLVS800 – DECEMBER 2007www.ti.com
•Qualified for Automotive Applications•150-mA Low-Dropout (LDO) Voltage Regulator•Dropout Voltage to 85 mV (Typ) at 150 mA(TPS76550)
•Ultra-Low 35- µA (Typ) Quiescent Current•3% Tolerance Over Specified Conditions forFixed-Output Versions•Open-Drain Power Good Output•Thermal Shutdown Protection
This device is designed to have an ultra-low quiescent current and be stable with a 4.7- µF capacitor. Thiscombination provides high performance at a reasonable cost.
Because the PMOS device behaves as a low-value resistor, the dropout voltage is very low (typically 85 mV atan output current of 150 mA for the TPS76550) and is directly proportional to the output current. Additionally,since the PMOS pass element is a voltage-driven device, the quiescent current is very low and independent ofoutput loading (typically 35 µA over the full range of output current, 0 mA to 150 mA). These two keyspecifications yield a significant improvement in operating life for battery-powered systems. This LDO alsofeatures a sleep mode; applying a TTL high signal to EN (enable) shuts down the regulator, reducing thequiescent current to less than 1 µA (typ).
Power good (PG) is an active-high output, which can be used to implement a power-on reset or a low-batteryindicator.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications ofTexas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2007, Texas Instruments IncorporatedProducts conform to specifications per the terms of the TexasInstruments standard warranty. Production processing does notnecessarily include testing of all parameters.
www.ti.com
PG
OUT
OUT
6
5
4
IN
IN
EN
GND
3
2
7
8
VI
0.1 µF
PG
VO
4.7 µF
+
TPS765xx
CO
1
NC/FB
300 mΩ
250 kΩ
+
V = 1.224 V
ref
OUT
FB
EN
GND
PG
+
IN
External to the device
R1
R2
–
–
TPS76501-Q1
ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUTVOLTAGE REGULATOR
SLVS800 – DECEMBER 2007
The TPS765xx is offered in 1.5-V, 1.8-V, 2.5-V, 2.7-V, 2.8-V, 3-V, 3.3-V and 5-V fixed-voltage versions and in anadjustable version (programmable over the range of 1.25 V to 5.5 V). Output voltage tolerance is specified as amaximum of 3% over line, load, and temperature ranges. The TPS765xx family is available in an 8-pin SOICpackage.
ORDERING INFORMATION
(1)
T
A
V
O
(TYP) PACKAGE
(2)
ORDERABLE PART NUMBER TOP-SIDE MARKING
– 40 °C to 125 °C Adjustable SOIC – D Reel of 2500 TPS76501QDRQ1 76501Q
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TIweb site at www.ti.com .(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging .
Figure 1. Typical Application Configuration for Fixed Output Options
FUNCTIONAL BLOCK DIAGRAM – ADJUSTABLE-VOLTAGE VERSION
2Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated
www.ti.com
_
+
Vref = 1.224 V
OUT
EN
GND
R1
R2
_
+
IN
PG
TPS76501-Q1ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT
VOLTAGE REGULATOR
SLVS800 – DECEMBER 2007
FUNCTIONAL BLOCK DIAGRAM – FIXED-VOLTAGE VERSION
TERMINAL FUNCTIONS
TERMINAL
I/O DESCRIPTIONNAME NO.
EN 1 I EnableFB 2 I Feedback voltageGND 3 Regulator groundIN 4, 5 I Input voltageOUT 6, 7 O Regulated output voltagePG 8 O Power good output
Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 3
www.ti.com
ABSOLUTE MAXIMUM RATINGS
(1) (2)
DISSIPATION RATINGS
RECOMMENDED OPERATING CONDITIONS
TPS76501-Q1
ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUTVOLTAGE REGULATOR
SLVS800 – DECEMBER 2007
over operating free-air temperature range (unless otherwise noted)
VALUE
V
I
Input voltage range – 0.3 V to 13.5 VVoltage range at EN – 0.3 V to 16.5 VMaximum PG voltage 16.5 VI
O
Peak output current Internally limitedP
D
Continuous total power dissipation See Dissipation RatingsV
O
Output voltage (OUT, FB) 7 VT
J
Operating virtual junction temperature range – 40 °C to 125 °CT
stg
Storage temperature range – 65 °C to 150 °CHuman-Body Model 2000 VESD Electrostatic discharge rating Machine Model 200 VCharged-Device Model 1500 V
(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 terminal ground.
POWER RATING DERATING FACTOR POWER RATING POWER RATINGPACKAGE AIR FLOW (CFM)
T
A
< 25 °C T
A
≥25 °C T
A
= 70 °C T
A
= 85 °C
0 568 mW 5.68 mW/ °C 312 mW 227 mWD
250 904 mW 9.04 mW/ °C 497 mW 361 mW
MIN MAX UNIT
V
I
Input voltage
(1)
2.7 10 VV
O
Output voltage 1.2 5.5 VI
O
Output current
(2)
0 150 mAT
J
Operating virtual junction temperature – 40 125 °C
(1) To calculate the minimum input voltage for your maximum output current, use the following equation: V
I(min)
= V
O(max)
+ V
DO(max load)
.(2) Continuous current and operating junction temperature are limited by internal protection circuitry, but it is not recommended that thedevice operate under conditions beyond those specified in this table for extended periods of time.
4Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated
www.ti.com
ELECTRICAL CHARACTERISTICS
Line Regulation (mV) +(%ńV) VO(VI(max) *2.7 V)
100 1000
Line Regulation (mV) +ǒ%ńVǓ VOǒVI(max) *ǒVO)1 VǓǓ
100 1000
TPS76501-Q1ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT
VOLTAGE REGULATOR
SLVS800 – DECEMBER 2007
V
I
= V
O(typ)
+ 1 V, I
O
= 10 µA, EN = 0 V, C
O
= 4.7 µF (unless otherwise noted)
PARAMETER TEST CONDITIONS T
J
MIN TYP MAX UNIT
25 °C V
OTPS76501 5.5 V ≥V
O
≥1.25 V
– 40 °C to 125 °C 0.97V
O
1.03V
O
25 °C 1.5TPS76515 2.7 V < V
IN
< 10 V
– 40 °C to 125 °C 1.455 1.54525 °C 1.8TPS76518 2.8 V < V
IN
< 10 V
– 40 °C to 125 °C 1.746 1.85425 °C 2.5TPS76525 3.5 V < V
IN
< 10 V
– 40 °C to 125 °C 2.425 2.57525 °C 2.7Output voltage
(1)
TPS76527 10- µA to 150-mA load 3.7 V < V
IN
< 10 V V– 40 °C to 125 °C 2.619 2.78125 °C 2.8TPS76528 3.8 V < V
IN
< 10 V
– 40 °C to 125 °C 2.716 2.88425 °C 3TPS76530 4 V < V
IN
< 10 V
– 40 °C to 125 °C 2.910 3.09025 °C 3.3TPS76533 4.3 V < V
IN
< 10 V
– 40 °C to 125 °C 3.201 3.39925 °C 5TPS76550 6 V < V
IN
< 10 V
– 40 °C to 125 °C 4.850 5.15010 µA < I
O
< 150 mA 25 °C 35Quiescent current (GND
µAcurrent)
(1)
I
O
= 150 mA – 40 °C to 125 °C 50Output voltage line regulation
(1) (2)
V
O
+ 1 V < V
I
≤10 V 25 °C 0.01 %/V(ΔV
O
/V
O
)Load regulation I
O
= 10 µA to 150 mA – 40 °C to 125 °C 0.3 %Output noise voltage BW = 300 Hz to 50 kHz, C
O
= 4.7 µF 25 °C 200 µVrmsOutput current limit V
O
= 0 V – 40 °C to 125 °C 0.8 1.2 AThermal shutdown junction
150 °Ctemperature
25 °C 1Standby current EN = V
I
, 2.7 V < V
I
< 10 V µA– 40 °C to 125 °C 10FB input current TPS76501 FB = 1.5 V – 40 °C to 125 °C 2 nAHigh-level EN input voltage – 40 °C to 125 °C 2 VLow-level EN input voltage – 40 °C to 125 °C 0.8 VPower-supply ripple rejection
(1)
f = 1 kHz, C
O
= 4.7 µF, I
O
= 10 mA 25 °C 63 dBMinimum input voltage for
I
O(PG)
= 300 µA – 40 °C to 125 °C 1.1 Vvalid PGTrip threshold voltage V
O
decreasing – 40 °C to 125 °C 92 98 %V
OPG
Hysteresis voltage Measured at V
O
– 40 °C to 125 °C 0.5 %V
O
Output low voltage V
I
= 2.7 V, I
O(PG)
= 1 mA – 40 °C to 125 °C 0.15 0.4 VLeakage current V
(PG)
= 5 V – 40 °C to 125 °C 1 µAEN = 0 V – 1 0 1EN input current – 40 °C to 125 °CµAEN = 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.(2) If V
O
≤1.8 V then V
I(min)
= 2.7 V, V
I(max)
= 10 V:
If V
O
≥2.5 V then V
I(min)
= V
O
+ 1 V, V
I(max)
= 10 V:
Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 5
www.ti.com
TPS76501-Q1
ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUTVOLTAGE REGULATOR
SLVS800 – DECEMBER 2007
ELECTRICAL CHARACTERISTICS (continued)V
I
= V
O(typ)
+ 1 V, I
O
= 10 µA, EN = 0 V, C
O
= 4.7 µF (unless otherwise noted)
PARAMETER TEST CONDITIONS T
J
MIN TYP MAX UNIT
25 °C 190TPS76528
– 40 °C to 125 °C 33025 °C 160TPS76530
– 40 °C to 125 °C 280Dropout voltage
(3)
I
O
= 150 mA mV25 °C 140TPS76533
– 40 °C to 125 °C 24025 °C 85TPS76550
– 40 °C to 125 °C 150
(3) IN voltage equals V
O(typ)
– 100 mV with output voltage set to 3.3 V nominal with external resistor divider. TPS76515, TPS76518,TPS76525, and TPS76527 dropout voltage limited by input voltage range limitations (i.e., TPS76530 input voltage must drop to 2.9 V forpurpose of this test).
6Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated
www.ti.com
TYPICAL CHARACTERISTICS
TPS76501-Q1ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT
VOLTAGE REGULATOR
SLVS800 – DECEMBER 2007
Table of Graphs
FIGURE
vs Load current 2, 3Output voltage
vs Free-air temperature 4, 5vs Load current 6, 7Ground current
vs Free-air temperature 8, 9Power-supply ripple rejection vs Frequency 10Output spectral noise density vs Frequency 11Output impedance vs Frequency 12Dropout voltage vs Free-air temperature 13, 14Line transient response 15, 17Load transient response 16, 18Output voltage vs Time 19Dropout voltage vs Input voltage 20Equivalent series resistance (ESR)
(1)
vs Output current 21 through 24Equivalent series resistance (ESR)
(1)
vs Added ceramic capacitance 25, 26
(1) Equivalent series resistance (ESR) refers to the total series resistance, including the ESR of the capacitor, any series resistance addedexternally, and PWB trace resistance to C
O
.
Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 7
www.ti.com
IL − Load Current − mA
− Output Voltage − V
VO
TPS76533
OUTPUT VOLTAGE
vs
LOAD CURRENT
3.292
3.294
3.296
3.298
3.300
3.302
3.304
0 25 50 75 100 125 150
VI = 4.3 V
TA = 25°C
IL − Load Current − mA
− Output Voltage − V
VO
TPS76515
OUTPUT VOLTAGE
vs
LOAD CURRENT
1.487
1.488
1.489
1.490
1.491
1.492
1.493
1.494
0 25 50 75 100 125 150
VI = 2.7 V
TA = 25°C
TA − Free-Air Temperature − °C
TPS76533
OUTPUT VOLTAGE
vs
FREE-AIR TEMPERATURE
− Output Voltage − V
VO
3.310
3.305
3.300
3.295
3.290
3.285
3.280
3.275
3.270
3.265 −25−50 0 25 50 75 100 125 150
VI = 4.3 V IO = 10 µA
IO = 150 mA
TPS76501-Q1
ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUTVOLTAGE REGULATOR
SLVS800 – DECEMBER 2007
Figure 2. Figure 3.
Figure 4. Figure 5.
8Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated
www.ti.com
34.0
34.1
34.2
34.3
34.4
34.5
34.6
34.7
34.8
34.9
35.0
0 25 50 75 100 125 150
IL − Load Current − mA
TPS76533
GROUND CURRENT
vs
LOAD CURRENT
VO = 3.3 V
TA = 25°C
GND
I− Ground Current − Aµ
33.0
33.1
33.2
33.3
33.4
33.5
33.6
33.7
33.8
33.9
34.0
0 25 50 75 100 125 150
IL − Load Current − mA
TPS76515
GROUND CURRENT
vs
LOAD CURRENT
VO = 1.5 V
TA = 25°C
GND
I− Ground Current − Aµ
TA − Free-Air Temperature − °C
TPS76533
GROUND CURRENT
vs
FREE-AIR TEMPERATURE
10
15
20
25
30
35
40
45
50
55
−50 0 50 100 150
VO = 3.3 V
IO = 150 mA
GND
I− Ground Current − Aµ
TA − Free-Air Temperature − °C
TPS76515
GROUND CURRENT
vs
FREE-AIR TEMPERATURE
15
20
25
30
35
40
45
50
55
−50 0 50 100 150
VO = 1.5 V
IO = 150 mA
GND
I− Ground Current − Aµ
TPS76501-Q1ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT
VOLTAGE REGULATOR
SLVS800 – DECEMBER 2007
Figure 6. Figure 7.
Figure 8. Figure 9.
Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 9
www.ti.com
f − Frequency − Hz
TPS76533
POWER SUPPLY RIPPLE REJECTION
vs
FREQUENCY
10
20
30
40
50
60
70
10.00 100.00 1000.0010000.00100000.001000000.0010000000.00
PSRR − Power Supply Ripple Rejection − dB
VI = 4.3 V
CO = 10 µF
IO = 150 mA
TA = 25°C
10 100 1k 10k 100k 1M 10M
f − Frequency − Hz
TPS76533
OUTPUT SPECTRAL NOISE DENSITY
vs
FREQUENCY
VI = 4.3 V
CO = 10 µF
TA = 25°C
1k 10k 100k
IO = 150 mA
IO = 1 mA
V HzOutput Spectral Noise Density − µ
101
100
10−1
10−2100
101
100
10−1
10−2
f − Frequency − Hz
TPS76533
OUTPUT IMPEDANCE
vs
FREQUENCY
VI = 4.3 V
CO = 10 µF
TA = 25°C
10 1k 10k 1M
IO = 150 mA
IO = 1 mA
100 100k
− Output Impedance −ZoΩ
TPS76501-Q1
ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUTVOLTAGE REGULATOR
SLVS800 – DECEMBER 2007
Figure 10. Figure 11.
Figure 12.
10 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated
www.ti.com
−50 −25 0 25 50 75 100 125 150
TA − Free-Air Temperature − °C
TPS76550
DROPOUT VOLTAGE
vs
FREE-AIR TEMPERATURE
100
10−1
10−2
10−3
IO = 10 mA
IO = 50 mA
IO = 150 mA
VI = 4.9 V
CO = 4.7 µF
− Output Voltage − V
VDO
TA − Free-Air Temperature − °C
TPS76533
DROPOUT VOLTAGE
vs
FREE-AIR TEMPERATURE
−50 −25 0 25 50 75 100 125 150
VI = 3.2 V
IO = 10 mA
IO = 50 mA
IO = 150 mA
100
10−1
10−2
10−3
− Output Voltage − V
VDO
VO− Change in
50
0
3.7
2.7
TPS76515
LINE TRANSIENT RESPONSE
VI
t − T ime − µs
0 300200100 400 500 700600 800 900 1000
− Input Voltage − V ∆
Output Voltage − mV
CL = 4.7 µF
TA = 25°C
−50
100
t − Time − µs
TPS76515
LOAD TRANSIENT RESPONSE
I − Output Current − mA
OVO− Change in∆
Output Voltage − mV
CL = 4.7 µF
TA = 25°C
150
0
0
200
400
−200
−400
0 300200100 400 500 700600 800 900 1000
TPS76501-Q1ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT
VOLTAGE REGULATOR
SLVS800 – DECEMBER 2007
Figure 13. Figure 14.
Figure 15. Figure 16.
Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 11
www.ti.com
VO− Change in
100
50
4.3
TPS76533
LINE TRANSIENT RESPONSE
VI
t − T ime − µs
− Input Voltage − V ∆
Output Voltage − mV
CL = 4.7 µF
TA = 25°C
0
5.3
−100
−50
0 300200100 400 500 700600 800 900 1000
t − Time − µs
TPS76533
LOAD TRANSIENT RESPONSE
I − Output Current − mA
OVO− Change in∆
Output Voltage − mV
CL = 4.7 µF
TA = 25°C
150
0
0
200
400
−200
0 300200100 400 500 700600 800 900 1000
t − Time − µs
TPS76533
OUTPUT VOLTAGE
vs
TIME (AT STARTUP)
3
2
VO− Output Voltage − V
0
1
4
Enable Pulse − V
0
0 300200100 400 500 700600 800 900 1000
4.3
VI − Input Voltage − V
− Output Voltage − V
VDO
TPS76501
DROPOUT VOLTAGE
vs
INPUT VOLTAGE
0.00
0.05
0.10
0.15
0.20
0.25
0.30
2.5 3.0 3.5 4.0 4.5 5.0
IO = 150 mA
TA = 125°C
TA = 25°C
TA = −40°C
TPS76501-Q1
ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUTVOLTAGE REGULATOR
SLVS800 – DECEMBER 2007
Figure 17. Figure 18.
Figure 19. Figure 20.
12 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated
www.ti.com
TPS76501-Q1ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT
VOLTAGE REGULATOR
SLVS800 – DECEMBER 2007
Figure 21. Figure 22.
Figure 23. Figure 24.
(1) Equivalent series resistance (ESR) refers to the total series resistance, including the ESR of the capacitor,any series resistance added externally, and PWB trace resistance to C
O
.
Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 13
www.ti.com
0.01
0.10
1.00
10.00
0.0 0.2 0.4 0.6 0.8 1.0
Added Ceramic Capacitance − µF
TYPICAL REGION OF STABILITY
EQUIVALENT SERIES RESISTANCE(1)
vs
ADDED CERAMIC CAPACITANCE
ESR − Equivalent Series Resistance − Ω
101
100
10−1
10−2
VI = 4.3 V
CO = 4.7 µF
VO = 3.3 V
TA = 25°C
IO = 150 mA
Minimum ESR
Region of Instability
Added Ceramic Capacitance − µF
TYPICAL REGION OF STABILITY
EQUIVALENT SERIES RESISTANCE(1)
vs
ADDED CERAMIC CAPACITANCE
0.01
0.10
1.00
10.00
0.0 0.2 0.4 0.6 0.8 1.0
ESR − Equivalent Series Resistance − Ω
101
100
10−1
10−2
VI = 4.3 V
VO = 3.3 V
CO = 10 µF
TA = 25°C
IO = 150 mA
Minimum ESR
Region of Instability
101
IN
EN
OUT
+
GND CO
ESR
RL
VITo Load
TPS76501-Q1
ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUTVOLTAGE REGULATOR
SLVS800 – DECEMBER 2007
Figure 25. Figure 26.
(1) Equivalent series resistance (ESR) refers to the total series resistance, including the ESR of the capacitor,any series resistance added externally, and PWB trace resistance to C
O
.
Figure 27. Test Circuit for Typical Regions of Stability (Figure 21 through Figure 24 )(Fixed-Output Options)
14 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated
www.ti.com
APPLICATION INFORMATION
Device Operation
Minimum Load Requirements
FB Pin Connection
External Capacitor Requirements
TPS76501-Q1ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT
VOLTAGE REGULATOR
SLVS800 – DECEMBER 2007
The TPS765xx family includes eight fixed-output voltage regulators (1.5 V, 1.8 V, 2.5 V, 2.7 V, 2.8 V, 3 V, 3.3 V,and 5 V), and an adjustable regulator, the TPS76501 (adjustable from 1.25 V to 5.5 V).
The TPS765xx features very low quiescent current, which remains virtually constant even with varying loads.Conventional LDO regulators use a pnp pass element, the base current of which is directly proportional to theload current through the regulator (I
B
= I
C
/β). The TPS765xx uses a PMOS transistor to pass current; becausethe gate of the PMOS is voltage driven, operating current is low and invariable over the full load range.
Another pitfall associated with the pnp-pass element is its tendency to saturate when the device goes intodropout. The resulting drop in βforces an increase in I
B
to maintain the load. During power up, this translates tolarge start-up currents. Systems with limited supply current may fail to start up. In battery-powered systems, itmeans rapid battery discharge when the voltage decays below the minimum required for regulation. TheTPS765xx quiescent current remains low even when the regulator drops out, eliminating both problems.
The TPS765xx also features a shutdown mode that places the output in the high-impedance state (essentiallyequal to the feedback-divider resistance) and reduces quiescent current to 1 µA (typ). If the shutdown feature isnot used, EN should be tied to ground. Response to an enable transition is quick; regulated output voltage isreestablished in typically 160 µs.
The TPS765xx is stable even at zero load; no minimum load is required for operation.
The FB pin is an input pin to sense the output voltage and close the loop for the adjustable voltage. The outputvoltage is sensed through a resistor divider network to close the loop as it is shown in Figure 29 . Normally, thisconnection should be as short as possible; however, the connection can be made near a critical circuit toimprove performance at that point. Internally, FB connects to a high-impedance wide-bandwidth amplifier andnoise pickup feeds through to the regulator output. Routing the FB connection to minimize/avoid noise pickup isessential.
An input capacitor is not usually required; however, a ceramic bypass capacitor (0.047 µF or larger) improvesload transient response and noise rejection if the TPS765xx is located more than a few inches from the powersupply. A higher-capacitance electrolytic capacitor may be necessary if large (hundreds of milliamps) loadtransients with fast rise times are anticipated.
Like all LDO regulators, the TPS765xx requires an output capacitor connected between OUT and GND tostabilize the internal control loop. The minimum recommended capacitance value is 4.7 µF and the ESR must bebetween 300 m Ωand 20 Ω. Capacitor values 4.7 µF or larger are acceptable, provided the ESR is less than20 Ω. Solid tantalum electrolytic, aluminum electrolytic, and multilayer ceramic capacitors are all suitable,provided they meet the requirements described previously.
Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 15
www.ti.com
PG
OUT
OUT
6
5
4
IN
IN
EN
GND
3
2
7
8
VI
0.1 µF
PG
VO
4.7 µF
+
TPS765xx
CO
1
NC/FB
300 mΩ
250 kΩ
Programming the TPS76501 Adjustable LDO Regulator
VO+Vref ǒ1)R1
R2Ǔ
(1)
R1 +ǒVO
Vref *1Ǔ R2
(2)
OUTPUT
VOLTAGE R1 R2
2.5 V
3.3 V
3.6 V
4.0 V
5.0 V
UNIT
174
287
324
383
523
169
169
169
169
169
kΩ
kΩ
kΩ
kΩ
kΩ
OUTPUT VOLTAGE
PROGRAMMING GUIDE
VO
VIPG
OUT
FB / NC
R1
R2
GND
EN
IN
≤ 0.8 V
≥ 2.0 V
TPS76501
PG
0.1 µF250 kΩ
300 mΩ
CO
TPS76501-Q1
ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUTVOLTAGE REGULATOR
SLVS800 – DECEMBER 2007
Figure 28. Typical Application Circuit (Fixed Versions)
The output voltage of the TPS76501 adjustable regulator is programmed using an external resistor divider asshown in Figure 29 . The output voltage is calculated using Equation 1 :
Where
V
ref
= 1.224 V (typ) (the internal reference voltage)
Resistors R1 and R2 should be chosen for approximately 7- µA divider current. Lower-value resistors can beused but offer no inherent advantage and waste more power. Higher values should be avoided as leakagecurrents at FB increase the output voltage error. The recommended design procedure is to choose R2 = 169 k Ωto set the divider current at 7 µA and then calculate R1 using Equation 2 :
Figure 29. TPS76501 Adjustable LDO Regulator Programming
16 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated
www.ti.com
Power-Good Indicator (PG)
Regulator Protection
Power Dissipation and Junction Temperature
PD(max) +TJmax *TA
RqJA
PD+ǒVI*VOǓ IO
TPS76501-Q1ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT
VOLTAGE REGULATOR
SLVS800 – DECEMBER 2007
The TPS765xx features a power-good output that can be used to monitor the status of the regulator. The internalcomparator monitors the output voltage: when the output drops to between 92% and 98% of its nominalregulated value, the PG output transistor turns on, taking the signal low. The open-drain output requires a pullupresistor. If not used, it can be left floating. PG can be used to drive power-on reset circuitry or used as alow-battery indicator.
The TPS765xx PMOS-pass transistor has a built-in back diode that conducts reverse currents 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. When extended reverse voltage is anticipated, external limiting may beappropriate.
The TPS765xx also features internal current limiting and thermal protection. During normal operation, theTPS765xx limits output current to approximately 0.8 A. When current limiting engages, the output voltage scalesback linearly until the overcurrent condition ends. While current limiting is designed to prevent gross devicefailure, care should be taken not to exceed the power dissipation ratings of the package. If the temperature of thedevice exceeds 150 °C (typical), thermal-protection circuitry shuts it down. Once the device has cooled below130 °C (typical), regulator operation resumes.
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 the following equation:
Where
T
Jmax
is the maximum allowable junction temperature.R
θJA
is the thermal resistance junction-to-ambient for the package.T
A
is the ambient temperature.
The regulator dissipation is calculated using:
Power dissipation resulting from quiescent current is negligible. Excessive power dissipation triggers the thermalprotection circuit.
Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 17
PACKAGING INFORMATION
Orderable Device Status (1) Package
Type Package
Drawing Pins Package
Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
TPS76501QDRQ1 ACTIVE SOIC D 8 2500 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.
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
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
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.
OTHER QUALIFIED VERSIONS OF TPS76501-Q1 :
•Catalog: TPS76501
NOTE: Qualified Version Definitions:
•Catalog - TI's standard catalog product
PACKAGE OPTION ADDENDUM
www.ti.com 18-Sep-2008
Addendum-Page 1
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other
changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest
issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and
complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale
supplied at the time of order acknowledgment.
TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms
and conditions of sale of semiconductor products. Testing and other quality control techniques are used to the extent TI deems necessary
to support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not necessarily
performed.
TI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and
applications using TI components. To minimize the risks associated with Buyers’ products and applications, Buyers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or
other intellectual property right relating to any combination, machine, or process in which TI components or services are used. Information
published by TI regarding third-party products or services does not constitute a license to use such products or services or a warranty or
endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the
third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alteration
and is accompanied by all associated warranties, conditions, limitations, and notices. TI is not responsible or liable for such altered
documentation. Information of third parties may be subject to additional restrictions.
Resale of TI components or services with statements different from or beyond the parameters stated by TI for that component or service
voids all express and any implied warranties for the associated TI component or service and is an unfair and deceptive business practice.
TI is not responsible or liable for any such statements.
Buyer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety-related requirements
concerning its products, and any use of TI components in its applications, notwithstanding any applications-related information or support
that may be provided by TI. Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which
anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause
harm and take appropriate remedial actions. Buyer will fully indemnify TI and its representatives against any damages arising out of the use
of any TI components in safety-critical applications.
In some cases, TI components may be promoted specifically to facilitate safety-related applications. With such components, TI’s goal is to
help enable customers to design and create their own end-product solutions that meet applicable functional safety standards and
requirements. Nonetheless, such components are subject to these terms.
No TI components are authorized for use in FDA Class III (or similar life-critical medical equipment) unless authorized officers of the parties
have executed a special agreement specifically governing such use.
Only those TI components which TI has specifically designated as military grade or “enhanced plastic” are designed and intended for use in
military/aerospace applications or environments. Buyer acknowledges and agrees that any military or aerospace use of TI components
which have not been so designated is solely at the Buyer's risk, and that Buyer is solely responsible for compliance with all legal and
regulatory requirements in connection with such use.
TI has specifically designated certain components which meet ISO/TS16949 requirements, mainly for automotive use. Components which
have not been so designated are neither designed nor intended for automotive use; and TI will not be responsible for any failure of such
components to meet such requirements.
Products Applications
Audio www.ti.com/audio Automotive and Transportation www.ti.com/automotive
Amplifiers amplifier.ti.com Communications and Telecom www.ti.com/communications
Data Converters dataconverter.ti.com Computers and Peripherals www.ti.com/computers
DLP® Products www.dlp.com Consumer Electronics www.ti.com/consumer-apps
DSP dsp.ti.com Energy and Lighting www.ti.com/energy
Clocks and Timers www.ti.com/clocks Industrial www.ti.com/industrial
Interface interface.ti.com Medical www.ti.com/medical
Logic logic.ti.com Security www.ti.com/security
Power Mgmt power.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense
Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video
RFID www.ti-rfid.com
OMAP Applications Processors www.ti.com/omap TI E2E Community e2e.ti.com
Wireless Connectivity www.ti.com/wirelessconnectivity
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2012, Texas Instruments Incorporated