Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - LDO voltage regulator Positive, fixed SOT 23 5

DBV (SOT-23) PACKAGE

(TOP VIEW)

GND

ON/OFF

OUT

BYPASS

LP2985

www.ti.com

SLVS522N –JULY 2004– REVISED JUNE 2011

150-mA LOW-NOISE LOW-DROPOUT REGULATOR WITH SHUTDOWN

Check for Samples: LP2985

– 2000-V Human-Body Model (A114-A)

FEATURES

– 200-V Machine Model (A115-A)

• Output Tolerance of

– 1% (A Grade)

PORTABLE APPLICATIONS

– 1.5% (Standard Grade)

• Cellular Phones

• Ultra-Low Dropout, Typically

• Palmtop and Laptop Computers

– 280 mV at Full Load of 150 mA

• Personal Digital Assistants (PDAs)

– 7 mV at 1 mA

• Digital Cameras and Camcorders

• Wide V

Range: 16 V Max

• CD Players

• Low I

: 850 μA at Full Load at 150 mA

• MP3 Players

• Shutdown Current: 0.01 μA Typ

• Low Noise: 30 μV

RMS

With 10-nF Bypass

Capacitor

• Stable With Low-ESR Capacitors, Including

Ceramic

• Overcurrent and Thermal Protection

• High Peak-Current Capability

• ESD Protection Exceeds JESD 22

DESCRIPTION/ORDERING INFORMATION

The LP2985 family of fixed-output, low-dropout regulators offers exceptional, cost-effective performance for both

portable and nonportable applications. Available in voltages of 1.8 V, 2.5 V, 2.8 V, 2.9 V, 3 V, 3.1 V, 3.3 V, 5 V,

and 10 V, the family has an output tolerance of 1% for the A version (1.5% for the non-A version) and is capable

of delivering 150-mA continuous load current. Standard regulator features, such as overcurrent and

overtemperature protection, are included.

The LP2985 has a host of features that makes the regulator an ideal candidate for a variety of portable

applications:

• Low dropout: A PNP pass element allows a typical dropout of 280 mV at 150-mA load current and 7 mV at

1-mA load.

• Low quiescent current: The use of a vertical PNP process allows for quiescent currents that are considerably

lower than those associated with traditional lateral PNP regulators.

• Shutdown: A shutdown feature is available, allowing the regulator to consume only 0.01 μA when the

ON/OFF pin is pulled low.

• Low-ESR-capacitor friendly: The regulator is stable with low-ESR capacitors, allowing the use of small,

inexpensive, ceramic capacitors in cost-sensitive applications.

• Low noise: A BYPASS pin allows for low-noise operation, with a typical output noise of 30 μV

RMS

, with the

use of a 10-nF bypass capacitor.

• Small packaging: For the most space-constrained needs, the regulator is available in the SOT-23 package.

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.

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 (28 pages)

PAGE 1
LP2985 SLVS522N – JULY 2004 – REVISED JUNE 2011 www.ti.com 150-mA LOW-NOISE LOW-DROPOUT REGULATOR WITH SHUTDOWN Check for Samples: LP2985 FEATURES – 2000-V Human-Body Model (A114-A) – 200-V Machine Model (A115-A) 1 • • • • • • • • • • Output Tolerance of – 1% (A Grade) – 1.5% (Standard Grade) Ultra-Low Dropout, Typically – 280 mV at Full Load of 150 mA – 7 mV at 1 mA Wide VIN Range: 16 V Max Low IQ: 850 μA at Full Load at 150 mA Shutdown Current: 0.
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LP2985 SLVS522N – JULY 2004 – REVISED JUNE 2011 www.ti.com ORDERING INFORMATION (1) TJ PART GRADE VOUT (NOM) PACKAGE (2) 1.8 V 2.5 V 2.8 V 2.9 V A grade: 1% tolerance 3.0 V 3.1 V 3.3 V 5.0 V 10.0 V –40°C to 125°C 1.8 V 2.5 V 2.8 V 2.9 V Standard grade: 1.5% tolerance 3.0 V 3.1 V 3.3 V 5.0 V 10.
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LP2985 SLVS522N – JULY 2004 – REVISED JUNE 2011 www.ti.com FUNCTIONAL BLOCK DIAGRAM VIN ON/OFF 1.23 V VREF − + BYPASS VOUT Overcurrent/ Overtemperature Protection Figure 1. BASIC APPLICATION CIRCUIT LP2985 VIN 1 VOUT 5 2.2 µF (see Note A) 1 µF (see Note A) GND 2 ON/OFF (see Note B) 3 4 BYPASS 10 nF (see Note C) A. Minimum COUT value for stability (can be increased without limit for improved stability and transient response) B. ON/OFF must be actively terminated.
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LP2985 SLVS522N – JULY 2004 – REVISED JUNE 2011 www.ti.com Absolute Maximum Ratings (1) over virtual junction temperature range (unless otherwise noted) (2) MIN MAX UNIT VIN Continuous input voltage range –0.3 16 V VON/ OFF ON/OFF input voltage range –0.3 16 V Output voltage range (3) –0.
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LP2985 SLVS522N – JULY 2004 – REVISED JUNE 2011 www.ti.com Electrical Characteristics at specified virtual junction temperature range, VIN = VOUT(NOM) + 1 V, VON/ OFF = 2 V, CIN = 1 μF, IL = 1 mA, COUT = 4.
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LP2985 SLVS522N – JULY 2004 – REVISED JUNE 2011 www.ti.com Electrical Characteristics (continued) at specified virtual junction temperature range, VIN = VOUT(NOM) + 1 V, VON/ OFF = 2 V, CIN = 1 μF, IL = 1 mA, COUT = 4.
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LP2985 SLVS522N – JULY 2004 – REVISED JUNE 2011 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS CIN = 1 μF, COUT = 4.7 μF, VIN = VOUT(NOM) + 1 V, TA = 25°C, ON/OFF pin tied to VIN (unless otherwise specified) OUTPUT VOLTAGE vs TEMPERATURE OUTPUT VOLTAGE vs TEMPERATURE 10.20 3.345 VI = 11 V 10.15 3.335 CO = 4.7 µF Output Voltage − V Output Voltage – V CI = 1 µF 10.10 VI = 4.3 V VO = 3.3 V Ci = 1 µF Co = 4.7 µF IO = 1 mA VO = 10 V IO = 1 mA 10.05 10.00 3.325 3.315 9.95 3.305 9.90 9.
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LP2985 SLVS522N – JULY 2004 – REVISED JUNE 2011 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) CIN = 1 μF, COUT = 4.7 μF, VIN = VOUT(NOM) + 1 V, TA = 25°C, ON/OFF pin tied to VIN (unless otherwise specified) SHORT-CIRCUIT CURRENT vs TIME 0.5 320 VI = 16 V VO = 3.3 V Ci = 1 µF Cbyp = 0.01 µF 0.45 0.4 VO = 3.3 V 300 0.35 280 ISC − mA Short-Circuit Current − A SHORT-CIRCUIT CURRENT vs OUTPUT VOLTAGE 0.3 0.25 260 0.2 240 0.15 0.1 220 0.
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LP2985 SLVS522N – JULY 2004 – REVISED JUNE 2011 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) CIN = 1 μF, COUT = 4.7 μF, VIN = VOUT(NOM) + 1 V, TA = 25°C, ON/OFF pin tied to VIN (unless otherwise specified) RIPPLE REJECTION vs FREQUENCY RIPPLE REJECTION vs FREQUENCY 100 100 VI = 3.7 V VO = 3.3 V Co = 10 µF Cbyp = 0 nF Ripple Rejection − dB 80 80 70 1 mA 60 50 50 mA 40 30 VI = 5 V VO = 3.3 V Co = 4.
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LP2985 SLVS522N – JULY 2004 – REVISED JUNE 2011 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) CIN = 1 μF, COUT = 4.7 μF, VIN = VOUT(NOM) + 1 V, TA = 25°C, ON/OFF pin tied to VIN (unless otherwise specified) OUTPUT IMPEDANCE vs FREQUENCY 10 10 Ci = 1 µF Co = 4.7 µF VO = 3.3 V 1 ILOAD = 150 mA 1 mA Noise Density − µV/ Hz Output Impedance − Ω OUTPUT NOISE DENSITY vs FREQUENCY 10 mA 100 mA 0.1 1 Cbyp = 100 pF Cbyp = 1 nF 0.1 Cbyp = 10 nF 0.01 0.001 10 0.
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LP2985 SLVS522N – JULY 2004 – REVISED JUNE 2011 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) CIN = 1 μF, COUT = 4.7 μF, VIN = VOUT(NOM) + 1 V, TA = 25°C, ON/OFF pin tied to VIN (unless otherwise specified) GROUND-PIN CURRENT vs TEMPERATURE LOAD TRANSIENT RESPONSE 1400 150 mA 200 3.38 150 3.36 100 800 600 1 mA 400 50 mA 3.34 3.32 3.3 50 IL VO = 3.3 V Cbyp = 10 nF ∆IL = 100 mA 0 −50 VO 3.28 −100 3.26 −150 3.24 −200 3.
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LP2985 SLVS522N – JULY 2004 – REVISED JUNE 2011 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) CIN = 1 μF, COUT = 4.7 μF, VIN = VOUT(NOM) + 1 V, TA = 25°C, ON/OFF pin tied to VIN (unless otherwise specified) 3.39 5 3.39 5 4.5 3.37 VI VO = 3.3 V Cbyp = 0 nF IO = 150 mA 4 3.5 3.33 3.31 VO 3 3.29 2.5 3.27 2 3.35 VI VO = 3.3 V Cbyp = 10 nF IO = 150 mA 4 3.33 3.5 3.31 3 3.29 VO 3.27 2.5 2 20 µs/div" 20 µs/div" Figure 22. Figure 23.
PAGE 13
LP2985 SLVS522N – JULY 2004 – REVISED JUNE 2011 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) CIN = 1 μF, COUT = 4.7 μF, VIN = VOUT(NOM) + 1 V, TA = 25°C, ON/OFF pin tied to VIN (unless otherwise specified) TURN-ON TIME TURN-ON TIME 4 10 10 4 VO VO 3 3 8 8 6 0 VO = 3.3 V Cbyp = 0 IO = 150 mA 4 −2 6 0 −1 VO = 3.3 V Cbyp = 100 pF ILOAD = 150 mA 4 −2 VON/OFF VON/OFF 2 −3 −3 −4 0 0 −4 100 µs/div" 200 µs/div" Figure 26. Figure 27.
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LP2985 SLVS522N – JULY 2004 – REVISED JUNE 2011 www.ti.com APPLICATION INFORMATION Capacitors Input Capacitor (CIN) A minimum value of 1 μF (over the entire operating temperature range) is required at the input of the LP2985. In addition, this input capacitor should be located within 1 cm of the input pin and connected to a clean analog ground. There are no equivalent series resistance (ESR) requirements for this capacitor, and the capacitance can be increased without limit.
PAGE 15
LP2985 SLVS522N – JULY 2004 – REVISED JUNE 2011 www.ti.com Noise Bypass Capacitor (CBYPASS) The LP2985 allows for low-noise performance with the use of a bypass capacitor that is connected to the internal bandgap reference via the BYPASS pin. This high-impedance bandgap circuitry is biased in the microampere range and, thus, cannot be loaded significantly, otherwise, its output – and, correspondingly, the output of the regulator – changes.
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LP2985 SLVS522N – JULY 2004 – REVISED JUNE 2011 www.ti.com is forward biased and can cause a parasitic silicon-controlled rectifier (SCR) to latch, resulting in high current flowing from the output to the input. Thus, to prevent possible damage to the regulator in any application where the output may be pulled above the input, an external Schottky diode should be connected between the output and input.
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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.
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PACKAGE OPTION ADDENDUM www.ti.com 13-Jun-2014 (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 30-Dec-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) LP2985-10DBVR SOT-23 DBV 5 3000 178.0 9.0 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3.23 3.17 1.37 4.0 8.0 Q3 LP2985-10DBVT SOT-23 DBV 5 250 178.0 9.0 3.3 3.2 1.4 4.0 8.0 Q3 LP2985-18DBVR SOT-23 DBV 5 3000 178.0 9.0 3.3 3.2 1.4 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 30-Dec-2013 Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) LP2985-33DBVT SOT-23 DBV 5 250 178.0 9.0 LP2985-33DBVT SOT-23 DBV 5 250 180.0 9.2 LP2985-50DBVR SOT-23 DBV 5 3000 180.0 LP2985-50DBVR SOT-23 DBV 5 3000 178.
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PACKAGE MATERIALS INFORMATION www.ti.com 30-Dec-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LP2985-10DBVR SOT-23 DBV 5 3000 180.0 180.0 18.0 LP2985-10DBVT SOT-23 DBV 5 250 180.0 180.0 18.0 LP2985-18DBVR SOT-23 DBV 5 3000 180.0 180.0 18.0 LP2985-18DBVR SOT-23 DBV 5 3000 205.0 200.0 33.0 LP2985-18DBVT SOT-23 DBV 5 250 205.0 200.0 33.0 LP2985-25DBVR SOT-23 DBV 5 3000 180.0 180.0 18.
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PACKAGE MATERIALS INFORMATION www.ti.com 30-Dec-2013 Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LP2985-50DBVR SOT-23 DBV 5 3000 205.0 200.0 33.0 LP2985-50DBVR SOT-23 DBV 5 3000 180.0 180.0 18.0 LP2985-50DBVT SOT-23 DBV 5 250 205.0 200.0 33.0 LP2985A-10DBVR SOT-23 DBV 5 3000 180.0 180.0 18.0 LP2985A-10DBVT SOT-23 DBV 5 250 180.0 180.0 18.0 LP2985A-18DBVJ SOT-23 DBV 5 10000 358.0 332.0 35.
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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.