Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - LDO voltage regulator Positive, fixed SOT 223 6

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FEATURES DESCRIPTION

APPLICATIONS

OUT

NC − No internal connection

DCQ PACKAGE

NR/FB

OUT

GND

SOT223-6

(TOP VIEW)

DGN PACKAGE

MSOP-8 PowerPADt

(TOP VIEW)

OUT

= 10 mA

OUT

= 250 mA

= 4.3 V,

OUT

= 3.3 V,

= 1 µF,

OUT

= 10 µF,

= 0.01 µF

10 100 1 k 10 k

Ripple Rejection (dB)

Frequency (Hz)

TPS79433

RIPPLE REJECTION

FREQUENCY

100 k 1 M 10 M

0.05

0.10

0.15

0.20

0.25

0.30

0.35

OUT

= 250 mA

OUT

= 1 mA

OUT

= 2.2 µF,

= 0.1 µF,

= 3.8 V

TPS79428

OUTPUT SPECTRAL NOISE DENSITY

FREQUENCY

Frequency (Hz)

100 1000 10000 100000

GND

Output Spectral Noise Density (µV/√Hz)

TPS794xx

SLVS349E – NOVEMBER 2001 – REVISED DECEMBER 2005

ULTRALOW-NOISE, HIGH-PSRR, FAST, RF, 250-mA

LOW-DROPOUT LINEAR REGULATORS

• 250-mA Low-Dropout Regulator With Enable

The TPS794xx family of low-dropout (LDO) linear

voltage regulators features high power-supply

• Available in Fixed and Adjustable (1.2 V to

rejection ratio (PSRR), ultralow-noise, fast start-up,

5.5 V) Versions

and excellent line and load transient responses in

• High PSRR (60 dB at 10 kHz)

small outline, MSOP-8 PowerPAD™ and SOT223-6

• Ultralow Noise (32 µ Vrms, TPS79428)

packages. Each device in the family is stable with a

small 2.2- µ F ceramic capacitor on the output. The

• Fast Start-Up Time (50 µ s)

family uses an advanced, proprietary BiCMOS

• Stable With a 2.2- µ F Ceramic Capacitor

fabrication process to yield extremely low dropout

• Excellent Load/Line Transient Response

voltages (for example, 155 mV at 250 mA). Each

device achieves fast start-up times (approximately

• Very Low Dropout Voltage (155 mV at Full

50 µ s with a 0.001- µ F bypass capacitor) while

Load)

consuming low quiescent current (170 µ A typical).

• Available in MSOP-8 and SOT223-6 Packages

Moreover, when the device is placed in standby

mode, the supply current is reduced to less than

1 µ A. The TPS79428 exhibits approximately

• RF: VCOs, Receivers, ADCs

32 µ V

RMS

of output voltage noise at 2.8 V output with

a 0.1- µ F bypass capacitor. Applications with analog

• Audio

components that are noise-sensitive, such as

• Bluetooth™, Wireless LAN

portable RF electronics, benefit from the high PSRR

• Cellular and Cordless Telephones

and low noise features as well as the fast response

• Handheld Organizers, PDAs

time.

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.

PowerPAD is a trademark of Texas Instruments.

Bluetooth is a trademark of Bluetooth SIG, Inc.

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (24 pages)

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TPS794xx www.ti.com SLVS349E – NOVEMBER 2001 – REVISED DECEMBER 2005 ULTRALOW-NOISE, HIGH-PSRR, FAST, RF, 250-mA LOW-DROPOUT LINEAR REGULATORS FEATURES • • • • • • • 250-mA Low-Dropout Regulator With Enable Available in Fixed and Adjustable (1.2 V to 5.5 V) Versions High PSRR (60 dB at 10 kHz) Ultralow Noise (32 µVrms, TPS79428) Fast Start-Up Time (50 µs) Stable With a 2.
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TPS794xx www.ti.com SLVS349E – NOVEMBER 2001 – REVISED DECEMBER 2005 This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
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TPS794xx www.ti.com SLVS349E – NOVEMBER 2001 – REVISED DECEMBER 2005 ELECTRICAL CHARACTERISTICS Over recommended operating temperature range (TJ = –40°C to 125°C), VEN = VIN, VIN = VOUT(nom) + 1 V (1), IOUT = 1mA, COUT = 10µF, CNR = 0.01 µF, unless otherwise noted. Typical values are at 25°C. PARAMETER TEST CONDITIONS MIN Input voltage, VIN (1) Continuous output current, IOUT Output voltage range Output voltage Accuracy TPS79401 V 250 mA 1.225 5.
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TPS794xx www.ti.com SLVS349E – NOVEMBER 2001 – REVISED DECEMBER 2005 FUNCTIONAL BLOCK DIAGRAM—ADJUSTABLE VERSION OUT IN Current Sense UVLO SHUTDOWN ILIM _ GND R1 + FB EN UVLO R2 Thermal Shutdown Quickstart Bandgap Reference 1.225 V VIN 250 kΩ External to the Device Vref NR(1) (1) Not Available on DCQ (SOT223) options.
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TPS794xx www.ti.com SLVS349E – NOVEMBER 2001 – REVISED DECEMBER 2005 TYPICAL CHARACTERISTICS TPS79433 OUTPUT VOLTAGE vs OUTPUT CURRENT TPS79428 OUTPUT VOLTAGE vs JUNCTION TEMPERATURE 3.290 TPS79428 GROUND CURRENT vs JUNCTION TEMPERATURE 190 2.800 3.285 IOUT = 1 mA 2.795 VIN = 3.8 V, COUT = 10 µF 185 3.280 180 IOUT = 1 mA 3.270 3.265 3.255 2.780 2.765 50 100 IOUT (mA) 200 250 −40 −25 −10 5 155 150 −40 −25 −10 5 20 35 50 65 80 95 110 125 TJ (°C) Figure 4.
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TPS794xx www.ti.com SLVS349E – NOVEMBER 2001 – REVISED DECEMBER 2005 TYPICAL CHARACTERISTICS (continued) TPS79433 RIPPLE REJECTION vs FREQUENCY TPS79433 RIPPLE REJECTION vs FREQUENCY 80 70 Ripple Rejection (dB) IOUT = 10 mA IOUT = 250 mA 60 50 40 VIN = 4.3 V, VOUT = 3.3 V, CIN = 1 µF, COUT = 10 µF, CNR = 0.01 µF 10 10 100 50 40 VIN = 4.3 V, VOUT = 3.3 V, CIN = 1 µF, COUT = 2.2 µF, CNR = 0.01 µF 20 10 10 k 100 k 1M 10 10 M 10 10 k 100 k 1M 0 10 M 10 100 1k 10 k 100 k Figure 13.
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TPS794xx www.ti.com SLVS349E – NOVEMBER 2001 – REVISED DECEMBER 2005 TYPICAL CHARACTERISTICS (continued) TPS79428 TYPICAL REGIONS OF STABILITY EQUIVALENT SERIES RESISTANCE (ESR) vs OUTPUT CURRENT 100 COUT = 2.2 µF TA = −40 to 85°C 10 Region of Instability 1 0.1 Region of Stability 0.
PAGE 8
TPS794xx www.ti.com SLVS349E – NOVEMBER 2001 – REVISED DECEMBER 2005 APPLICATION INFORMATION The TPS794xx family of low-dropout (LDO) regulators has been optimized for use in noise-sensitive equipment. The device features extremely low dropout voltages, high PSRR, ultralow output noise, low quiescent current (265 µA typically), and an enable input to reduce supply currents to less than 1 µA when the regulator is turned off. A typical application circuit is shown in Figure 22.
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TPS794xx www.ti.com SLVS349E – NOVEMBER 2001 – REVISED DECEMBER 2005 PROGRAMMING THE TPS79401 ADJUSTABLE LDO REGULATOR In order to improve the stability of the adjustable version, it is suggested that a small compensation capacitor be placed between OUT and FB. The output voltage of the TPS79401 adjustable regulator is programmed using an external resistor divider as shown in Figure 23.
PAGE 10
TPS794xx www.ti.com SLVS349E – NOVEMBER 2001 – REVISED DECEMBER 2005 THERMAL INFORMATION The amount of heat that an LDO linear regulator generates is directly proportional to the amount of power it dissipates during operation. All integrated circuits have a maximum allowable junction temperature (TJmax) above which normal operation is not assured. A system designer must design the operating environment so that the operating junction temperature (TJ) does not exceed the maximum junction temperature (TJmax).
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TPS794xx www.ti.com SLVS349E – NOVEMBER 2001 – REVISED DECEMBER 2005 Equation 5 simplifies into Equation 6: T J + T A ) PD max RθJA (6) Rearranging Equation 6 gives Equation 7: T * TA R θJA + J PD max (7) Using Equation 6 and the computer model generated curves shown in Figure 25, a designer can quickly compute the required heatsink thermal resistance/board area for a given ambient temperature, power dissipation, and operating environment. To illustrate, the TPS79425 in a SOT223 package was chosen.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 18-Oct-2013 (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) TPS79401DCQR SOT-223 DCQ 6 2500 330.0 12.4 TPS79401DGNR MSOPPower PAD DGN 8 2500 330.0 TPS79401DGNT MSOPPower PAD DGN 8 250 TPS79418DCQR SOT-223 DCQ 6 TPS79418DGNR MSOPPower PAD DGN TPS79418DGNT MSOPPower PAD TPS79425DCQR TPS79425DGNR 6.8 7.3 1.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant TPS79428DGNT MSOPPower PAD DGN 8 250 180.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 TPS79430DCQR SOT-223 DCQ 6 2500 330.0 12.4 6.8 7.3 1.88 8.0 12.0 Q3 TPS79430DGNR MSOPPower PAD DGN 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 TPS79430DGNT MSOPPower PAD DGN 8 250 180.0 12.4 5.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS79418DCQR SOT-223 DCQ 6 2500 358.0 335.0 35.0 TPS79418DGNR MSOP-PowerPAD DGN 8 2500 367.0 367.0 35.0 TPS79418DGNT MSOP-PowerPAD DGN 8 250 210.0 185.0 35.0 TPS79425DCQR SOT-223 DCQ 6 2500 358.0 335.0 35.0 TPS79425DGNR MSOP-PowerPAD DGN 8 2500 367.0 367.0 35.0 TPS79425DGNT MSOP-PowerPAD DGN 8 250 210.0 185.0 35.
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