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ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - LDO voltage regulator Positive, fixed SC 70 5

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SGLS264A − SEPTEMBER 2004 − REVISED JUNE 2008

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FEATURES

Qualified for Automotive Applications

D 10-mA Low-Dropout Regulator

D Ultralow 1.2-µA Quiescent Current at 10 mA

D 5-Pin SC70/SOT-323 (DCK) Package

D Integrated Power Good Output

D Stable With Any Capacitor (>0.47 µF)

D Dropout Voltage Typically 105 mV at 10 mA

(TPS79733)

D Over Current Limitation

D −40°C to 125°C Operating Junction

Temperature Range

APPLICATIONS

Battery Powered Microcontrollers and

Microprocessors

DESCRIPTION

The TPS797xx family of low-dropout (LDO) voltage

regulators offers the benefits of low-dropout voltage and

ultralow-power operation. The device is stable with any

capacitor (>0.47 µF). Therefore, implementations of

this device require little board space due to the

miniaturized packaging and potentially small output

capacitor. In addition, the family includes an integrated

open drain active-high power good (PG) output.

Intended for use in microcontroller based,

battery-powered applications, the TPS797xx family’s

low dropout and ultralow-powered operation results in

a significant increase in system battery operating life.

The small packaging minimizes consumption of board

space.

The device is enabled when the applied voltage

exceeds the minimum input voltage. The usual PNP

pass transistor has been replaced by a PMOS pass

element. Because the PMOS pass element behaves as

a low-value resistor, the dropout voltage is low, typically

105 mV at 10 mA of load current and is directly

proportional to the load current. The quiescent current

is ultralow (1.2 µA typically) and is stable over the entire

range of output load current (0 mA to 10 mA). When

properly configured with a pullup resistor, the PG output

can be used to implement a power-on reset or low

battery indicator. The TPS797xx is offered in 1.8-V, 3-V,

and 3.3-V fixed options.

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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.

DCK PACKAGE

(TOP VIEW)

GND

OUT

0.50

0.75

1.25

1.50

1.75

−40 −15 10 35 60

− Free-Air Temperature − °C

TPS79733

GROUND CURRENT

FREE-AIR TEMPERATURE

Ground Current − Aµ

= 4.3 V

= 3.3 V

= 1 µF

= 10 mA

Summary of content (14 pages)

PAGE 1
SGLS264A − SEPTEMBER 2004 − REVISED JUNE 2008 The device is enabled when the applied voltage exceeds the minimum input voltage. The usual PNP pass transistor has been replaced by a PMOS pass element.
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SGLS264A − SEPTEMBER 2004 − REVISED JUNE 2008 TJ AVAILABLE OPTIONS†§ VOLTAGE PACKAGE} PART NUMBER 1.8 V −40°C −40 C to 125 125°C C 3V SC70/SOT-323 (DCK) 3.3 V SYMBOL TPS79718QDCKRQ1¶ TPS79730QDCKRQ1¶ QTD QTE TPS79733QDCKRQ1¶ QTF † For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at http://www.ti.com.
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SGLS264A − SEPTEMBER 2004 − REVISED JUNE 2008 electrical characteristics over recommended operating free-air temperature range, VI = VO(typ) + 1 V, IO = 1 mA, Co = 1 µF (unless otherwise noted) PARAMETER VI Input voltage (see Note 2) IO TJ Operating junction temperature, TJ TEST CONDITIONS IO = 3 mA IO = 10 mA Continuous output current (see Note 3) Output voltage (10 µA to 10 mA Load) (see Note 4) TPS79718 TA = 25°C, TJ = −40°C to 125°C, 2.8 V < VI < 5.
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SGLS264A − SEPTEMBER 2004 − REVISED JUNE 2008 functional block diagram VOUT VIN Current Sense ILIM _ R1 + GND R2 Bandgap Reference VIN Vref = 1.235 V PG Delay Terminal Functions TERMINAL NAME NO. I/O DESCRIPTION GND 2 NC 3 OUT 5 O The OUT terminal provides the regulated output voltage of the device. PG 1 O The PG terminal for the fixed voltage option devices is an open drain, active-high output that indicates the status of VO (output of the LDO).
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SGLS264A − SEPTEMBER 2004 − REVISED JUNE 2008 TPS797xx PG timing diagram VIN Vmin (see Note A) t VOUT Threshold Voltage VIT − (see Note B) VIT + (see Note B) t PG Output t NOTES: A. Vmin = VOUT + VDO B. The PG trip voltage is typically 10% lower than the output voltage (90%VO). VIT− to VIT+ is the hysteresis voltage. www.ti.
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SGLS264A − SEPTEMBER 2004 − REVISED JUNE 2008 TYPICAL CHARACTERISTICS TPS79733 TPS79718 TPS79733 OUTPUT VOLTAGE vs OUTPUT CURRENT OUTPUT VOLTAGE vs OUTPUT CURRENT OUTPUT VOLTAGE vs FREE-AIR TEMPERATURE VI = 4.3 V Co = 1 µF TA = 25°C VI = 2.8 V Co = 1 µF TA = 25°C 3.305 3.300 3.295 3.33 1.805 1.800 1.795 1.790 3.290 VI = 4.3 V Co = 1 µF 3.34 V O − Output Voltage − V 1.810 V O − Output Voltage − V 3.310 V O − Output Voltage − V 3.35 1.815 3.315 3.32 3.
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SGLS264A − SEPTEMBER 2004 − REVISED JUNE 2008 TPS79718 TPS79718 LINE TRANSIENT RESPONSE LOAD TRANSIENT RESPONSE ∆ V − Change In O Output Voltage − mV dv 0.14 V = dt µs 3.8 2.8 50 Current Load − mA IO = 10 mA VO = 1.8 V Co = 4.7 µF 100 0 50 −100 100 50 0 −50 VI = 2.8 V VO = 1.8 V Co = 4.
PAGE 8
SGLS264A − SEPTEMBER 2004 − REVISED JUNE 2008 APPLICATION INFORMATION The TPS797xx family of low-dropout (LDO) regulators have been optimized for use in micropower applications. They feature extremely low dropout voltages and ultralow quiescent current (1.2 µA typically). A typical application circuit is shown in Figure 14. TPS797xx 4 IN PG 1 100 kΩ + C1 0.1 µF − OUT 5 VO 3 NC GND + 0.47 µF 2 Figure 14.
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SGLS264A − SEPTEMBER 2004 − REVISED JUNE 2008 APPLICATION INFORMATION power dissipation and junction temperature Specified regulator operation is assured to a junction temperature of 125°C; restrict the maximum junction temperature to 125°C under normal operating conditions. This restriction limits the power dissipation the regulator can handle in any given application.
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SGLS264A − SEPTEMBER 2004 − REVISED JUNE 2008 APPLICATION INFORMATION microcontroller application (continued) Figure 15 shows an application in which the TPS79718 is used to power Texas Instruments MSP430 mixed signal microcontroller. VOUT VIN 1.8 V + 0.47 µF TPS79718 − VCC MSP430 or Equivalent 0.1 µF PG RESET VSS GND Figure 15.
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PACKAGE OPTION ADDENDUM www.ti.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.