LP2985AIM5X-2.6 National Semiconductor, LP2985AIM5X-2.6 Datasheet

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LP2985AIM5X-2.6

Manufacturer Part Number
LP2985AIM5X-2.6
Description
LP2985 Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator in SOT-23 and micro SMD Packages Designed for Use with Very Low ESR Output Capacitors; Package: SOT-23; No of Pins: 5
Manufacturer
National Semiconductor
Datasheet
© 2009 National Semiconductor Corporation
Micropower 150 mA Low-Noise Ultra Low-Dropout
Regulator in SOT-23 and micro SMD Packages
Designed for Use with Very Low ESR Output Capacitors
General Description
The LP2985 is a 150 mA, fixed-output voltage regulator de-
signed to provide ultra low-dropout and low noise in battery
powered applications.
Using an optimized VIP
the LP2985 delivers unequalled performance in all specifica-
tions critical to battery-powered designs:
Dropout Voltage: Typically 300 mV @ 150 mA load, and
7 mV @ 1 mA load.
Ground Pin Current: Typically 850 µA @ 150 mA load, and
75 µA @ 1 mA load.
Enhanced Stability: The LP2985 is stable with output ca-
pacitor ESR as low as 5 mΩ, which allows the use of ceramic
capacitors on the output.
Sleep Mode: Less than 1 µA quiescent current when ON/OFF
pin is pulled low.
Smallest Possible Size: SOT-23 and micro SMD packages
use absolute minimum board space.
Precision Output: 1% tolerance output voltages available (A
grade).
Low Noise: By adding a 10 nF bypass capacitor, output noise
can be reduced to 30 µV (typical).
Multiple voltage options, from 2.5V to 5.0V, are available as
standard products. Consult factory for custom voltages.
Block Diagram
VIP
®
is a registered trademark of National Semiconductor Corporation.
®
(Vertically Integrated PNP) process,
100140
LP2985
Features
Applications
Ultra low dropout voltage
Guaranteed 150 mA output current
Smallest possible size (SOT-23, micro SMD package)
Requires minimum external components
Stable with low-ESR output capacitor
<1 µA quiescent current when shut down
Low ground pin current at all loads
Output voltage accuracy 1% (A Grade)
High peak current capability
Wide supply voltage range (16V max)
Low Z
Overtemperature/overcurrent protection
−40°C to +125°C junction temperature range
Custom voltages available
Cellular Phone
Palmtop/Laptop Computer
Personal Digital Assistant (PDA)
Camcorder, Personal Stereo, Camera
OUT
: 0.3Ω typical (10 Hz to 1 MHz)
10014001
November 25, 2009
www.national.com

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LP2985AIM5X-2.6 Summary of contents

Page 1

... Multiple voltage options, from 2.5V to 5.0V, are available as standard products. Consult factory for custom voltages. Block Diagram VIP ® registered trademark of National Semiconductor Corporation. © 2009 National Semiconductor Corporation LP2985 Features ■ Ultra low dropout voltage ■ ...

Page 2

Basic Application Circuit    *ON/OFF input must be actively terminated. Tie to V   **Minimum capacitance is shown to ensure stability (may be increased without limit). Ceramic capacitor required for output (see Application Hints). ***Reduces output noise (may be omitted ...

Page 3

... STD A 3.5 STD A 3.6 STD A 3.8 STD Order Information Package Marking LP2985AIM-2.5 LAUA LP2985AIM5X-2.5 LAUA LP2985IM5-2.5 LAUB LP2985IM5X-2.5 LAUB LP2985AIM5-2.6 LCEA LP2985AIM5X-2.6 LCEA LP2985AIM5-2.7 LALA LP2985AIM5X-2.7 LALA LP2985IM5-2.7 LALB LP2985IM5X-2.7 LALB LP2985AIM5-2.8 L0KA LP2985AIM5X-2.8 L0KA LP2985IM5-2.8 L0KB LP2985IM5X-2.8 L0KB LP2985AIM5-2.9 LAXA LP2985AIM5X-2.9 LAXA LP2985IM5-2.9 LAXB LP2985IM5X-2 ...

Page 4

... LP2985IM5-4.5 LA7B LP2985AIM5-5.0 L0UA LP2985AIM5X-5.0 L0UA LP2985IM5-5.0 L0UB LP2985IM5X-5.0 L0UB LP2985AIM5-5.7 LKTA LP2985AIM5X-5.7 LKTA LP2985IM5-5.7 LKTB LP2985IM5X-5.7 LKTB LP2985AIM5-6.1 LF6A LP2985AIM5X-6.1 LF6A LP2985IM5-6.1 LF6B LP2985IM5X-6.1 LF6B LP2985AITPX-2.5 LP2985ITP-2.5 LP2985AITP-2.6 LP2985AITPX-2.6 LP2985ITP-2.6 LP2985ITPX-2.6 LP2985AITP-2.7 LP2985AITPX-2.7 LP2985ITP-2.7 LP2985ITPX-2.7 LP2985AITP-2.8 LP2985AITPX-2.8 LP2985ITP-2.8 LP2985ITPX-2.8 LP2985AITP-2.9 LP2985AITPX-2 ...

Page 5

Output Voltage Grade (V) A 5.0 STD micro SMD, 5 Bump Package (TLA05 - 300 µm ball) A 3.3 STD Order Information Package Marking LP2985AITP-5.0 LP2985AITPX-5.0 LP2985ITP-5.0 LP2985ITPX-5.0 LP2985AITL-3.3 LP2985AITLX-3.3 LP2985ITL-3.3 LP2985ITLX-3.3 5 Supplied as: 250 Units on Tape and ...

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 Temp. (Soldering, 5 sec.) ESD Rating (Note 2) Electrical Characteristics Limits in standard typeface are for T ...

Page 7

Symbol Parameter e Output Noise n Voltage (RMS) Ripple Rejection I (SC) Short Circuit Current O I (PK) Peak Output Current O Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the component may occur. Electrical specifications do ...

Page 8

Typical Performance Characteristics (NOM) + 25°C, ON/OFF pin is tied Temperature OUT Short-Circuit Current Ripple Rejection www.national.com Unless otherwise specified Short-Circuit Current 10014008 Short Circuit Current vs Output Voltage 10014010 ...

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Ripple Rejection 10014015 Ripple Rejection 10014017 Ripple Rejection 10014019 Ripple Rejection Ripple Rejection Ripple Rejection 9 10014016 10014018 10014023 www.national.com ...

Page 10

Ripple Rejection Output Impedance vs Frequency Output Noise Density www.national.com Output Impedance vs Frequency 10014022 Output Noise Density 10014021 Ground Pin vs Load Current 10014025 10 10014020 10014024 10014026 ...

Page 11

Dropout Voltage vs Temperature 10014027 GND Pin Current vs Temperature 10014030 Load Transient Response 10014032 Input Current vs Pin Instantaneous Short Circuit Current Load Transient Response 11 10014029 10014031 10014033 www.national.com ...

Page 12

Load Transient Response Line Transient Response Line Transient Response www.national.com Line Transient Response 10014034 Line Transient Response 10014036 10014038 12 10014035 10014037 Turn-On Time 10014039 ...

Page 13

Turn-On Time 10014040 Turn-On Time 10014042 13 Turn-On Time 10014041 www.national.com ...

Page 14

Application Hints EXTERNAL CAPACITORS Like any low-dropout regulator, the LP2985 requires external capacitors for regulator stability. These capacitors must be correctly selected for good performance. Input Capacitor An input capacitor whose capacitance is between the LP2985 input and ground (the ...

Page 15

... FIGURE 2. Reverse Current Protection MICRO SMD MOUNTING The micro SMD package requires specific mounting tech- niques which are detailed in National Semiconductor Appli- cation Note # 1112. Referring to the section Surface Mount Technology (SMT) Assembly Considerations, it should be noted that the pad style which must be used with the 5-pin package is the NSMD (non-solder mask defined) type ...

Page 16

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted SOT-23, 5-Lead Small Outline Package (M5) NS Package Number MF05A. 16 ...

Page 17

NOTES: UNLESS OTHERWISE SPECIFIED 1. EPOXY COATING 2. 63Sn/37Pb EUTECTIC BUMP 3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD. 4. PIN 1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION. REMAINING PINS ARE NUMBERED COUNTER CLOCK- WISE. 5. ...

Page 18

NOTES: UNLESS OTHERWISE SPECIFIED 1. EPOXY COATING 2. 63Sn/37Pb EUTECTIC BUMP 3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD. 4. PIN 1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION. REMAINING PINS ARE NUMBERED COUNTER CLOCK- WISE. 5. ...

Page 19

Notes 19 www.national.com ...

Page 20

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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