LP2987AIM-2.8 National Semiconductor, LP2987AIM-2.8 Datasheet

LP2987AIM-2.8

Manufacturer Part Number

LP2987AIM-2.8

Description

LP2987AIM-2.8Micropower, 200 mA Ultra Low-Dropout Voltage Regulator with Programmable Power-On Reset Delay; Low Noise Version Available (LP2988)

Manufacturer

National Semiconductor

Datasheet

1.LP2987AIM-2.8.pdf (19 pages)

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LP2987/LP2988

Micropower, 200 mA Ultra Low-Dropout Voltage

Regulator with Programmable Power-On Reset Delay;

Low Noise Version Available (LP2988)

General Description

The LP2987/8 are fixed-output 200 mA precision LDO volt-

age regulators with power-ON reset delay which can be

implemented using a single external capacitor.

The LP2988 is specifically designed for noise-critical appli-

cations. A single external capacitor connected to the Bypass

pin reduces regulator output noise.

Using an optimized VIP

cess, these regulators deliver superior performance:

Dropout Voltage: 180 mV

load (typical).

Ground Pin Current: 1 mA

10 mA load (typical).

Sleep Mode: The LP2987/8 draws less than 2 µA quiescent

current when shutdown pin is held low.

Error Flag/Reset: The error flag goes low when the output

drops approximately 5% below nominal. This pin also pro-

vides a power-ON reset signal if a capacitor is connected to

the DELAY pin.

Precision Output: Standard product versions of the LP2987

and LP2988 are available with output voltages of 5.0V, 3.8V,

3.3V, 3.2V, 3.0V, or 2.8V, with guaranteed accuracy of 0.5%

(“A” grade) and 1% (standard grade) at room temperature.

Block Diagrams

VIP

™

is a trademark of National Semiconductor Corporation.

™

(Vertically Integrated PNP) pro-

200 mA load, and 1 mV

200 mA load, and 200 µA

DS100017

DS100017-1

1 mA

Features

n Ultra low dropout voltage

n Power-ON reset delay requires only one component

n Bypass pin for reduced output noise (LP2988)

n Guaranteed continuous output current 200 mA

n Guaranteed peak output current

n SO-8 and mini SO-8 surface mount packages

n Low ground pin current at all loads

n 0.5% output voltage accuracy (“A” grade)

n Wide supply voltage range (16V max)

n Overtemperature/overcurrent protection

n −40˚C to +125˚C junction temperature range

Applications

n Cellular Phone

n Palmtop/Laptop Computer

n Camcorder, Personal Stereo, Camera

2 µA quiescent current when shutdown

250 mA

www.national.com

March 1999

DS100017-2

Related parts for LP2987AIM-2.8

LP2987AIM-2.8 Summary of contents

Page 1

... LP2988 are available with output voltages of 5.0V, 3.8V, 3.3V, 3.2V, 3.0V, or 2.8V, with guaranteed accuracy of 0.5% (“A” grade) and 1% (standard grade) at room temperature. Block Diagrams VIP ™ trademark of National Semiconductor Corporation. © 1999 National Semiconductor Corporation DS100017 Features n Ultra low dropout voltage n Power-ON reset delay requires only one component ...

Page 2

... L66A LP2987IMMX-3.2 L66B LP2987IMM-3.2 L66B LP2987AIMMX-3.0 L42A LP2987AIMM-3.0 L42A LP2987IMMX-3.0 L42B LP2987IMM-3.0 L42B LP2987AIMMX-2.8 L89A LP2987AIMM-2.8 L89A LP2987IMMX-2.8 L89B LP2987IMM-2.8 L89B LP2987AIMX-5.0 2987AIM5.0 LP2987AIM-5.0 2987AIM5.0 LP2987IMX-5.0 2987IM5.0 LP2987IM-5.0 2987IM5.0 LP2987AIMX-3.8 2987AIM3.8 LP2987AIM-3.8 2987AIM3.8 LP2987IMX-3.8 2987IM3.8 LP2987IM-3.8 2987IM3.8 LP2987AIMX-3.3 2987AIM3.3 LP2987AIM-3.3 2987AIM3.3 2 Supplied as: 3 ...

Page 3

... LP2987IMX-3.2 2987IM3.2 LP2987AIM-3.2 2987IM3.2 LP2987IMX-3.0 2987AIM3.0 LP2987AIM-3.0 2987AIM3.0 LP2987IMX-3.0 2987IM3.0 LP2987IM-3.0 2987IM3.0 2987AIM2.8 LP2987AIM-2.8 2987AIM2.8 LP2987IMX-2.8 2987IM2.8 LP298AIM-2.8 298AIM2.8 3 Supplied as: 2.5k Units on Tape and Reel Shipped in Anti-Static Rails 2.5k Units on Tape and Reel Shipped in Anti-Static Rails 2.5k Units on Tape and Reel Shipped in Anti-Static Rails 2 ...

Page 4

Connection Diagram (LP2988) Mini SO-8 Package Type MM: See NS Package Drawing Number MUA08A SO-8 Package Type M: See NS Package Drawing Number M08A For ordering information, refer to Table 2 in this document. Ordering Information (LP2988) TABLE 2. Package ...

Page 5

Ordering Information (LP2988) TABLE 2. Package Marking and Ordering Information (Continued) Output Voltage Grade Order Information 3.3 STD 3.3 STD 3.2 A LP2988AIMX-3.2 3.2 A 3.2 STD 3.2 STD 3.0 A LP2988AIMX-3.0 3.0 A 3.0 STD 3.0 STD 2.8 A ...

Page 6

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Storage Temperature Range Operating Junction Temperature Range Lead Temperature (Soldering, 5 seconds) ESD Rating (Note 2) Power Dissipation (Note 3) Input Supply Voltage (Survival) ...

Page 7

Electrical Characteristics Limits in standard typeface are for T = 25˚C, and limits in boldface type apply over the full operating temperature range. Un- J less otherwise specified (NOM Symbol Parameter I ...

Page 8

Typical Performance Characteristics C = 2.2 µF, S/D is tied Temperature OUT Dropout Voltage vs Load Current Ground Pin Current vs Temperature and Load www.national.com Unless otherwise specified: T ...

Page 9

Typical Performance Characteristics C = 2.2 µF, S/D is tied (NOM Input Current DS100017-23 Load Transient Response Line Transient Response Unless otherwise specified: T ...

Page 10

Typical Performance Characteristics C = 2.2 µF, S/D is tied Turn-On Waveform Short Circuit Current Short Circuit Current vs Output Voltage www.national.com Unless otherwise specified: T (NOM ...

Page 11

Typical Performance Characteristics C = 2.2 µF, S/D is tied (NOM Load Regulation Shutdown Voltage vs Temperature DS100017-37 Delay Pin Current DS100017-45 Unless ...

Page 12

Typical Performance Characteristics C = 2.2 µF, S/D is tied Delay Sink Current vs Temperature Output Impedance vs Frequency Ripple Rejection (LP2987) www.national.com Unless otherwise specified: T (NOM) + 1V, I ...

Page 13

Typical Performance Characteristics C = 2.2 µF, S/D is tied (NOM Output Noise Density (LP2987) Output Noise Density (LP2988) Turn-On Time (LP2988) Unless otherwise specified ...

Page 14

Typical Performance Characteristics C = 2.2 µF, S/D is tied Turn-On Time (LP2988) Basic Application Circuits *Capacitance value shown is minimum required to assure stability, but may be increased without limit. ...

Page 15

Application Hints EXTERNAL CAPACITORS As with any low-dropout regulator, external capacitors are required to assure stability. These capacitors must be cor- rectly selected for proper performance. INPUT CAPACITOR: An input capacitor ( 2.2 µF) is re- quired between the LP2987/8 ...

Page 16

Application Hints (Continued) Timing Diagram for Power-Up The external capacitor c sets the delay time (T DLY The value of capacitor required for a given time delay may be calculated using the formula /(5. DLY ...

Page 17

Application Hints (Continued) To assure proper operation, the signal source used to drive the Shutdown input must be able to swing above and below the specified turn-on/turn-off voltage thresholds listed as V and V , respectively (see Electrical Characteristics). L ...

Page 18

Physical Dimensions inches (millimeters) unless otherwise noted www.national.com Mini SO-8 Package Type MM NS Package Number MUA08A 18 ...

Page 19

... National Semiconductor Asia Pacific Customer Fax: +49 (0) 1 80-530 85 86 Response Group Email: europe.support@nsc.com Tel: 65-2544466 Fax: 65-2504466 Tel: +49 (0) 1 80-532 78 32 Email: sea.support@nsc.com Tel: +49 (0) 1 80-534 16 80 National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 ...

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