LP3986BL-3131 National Semiconductor, LP3986BL-3131 Datasheet

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LP3986BL-3131

Manufacturer Part Number
LP3986BL-3131
Description
Dual Micropower 150 mA Ultra Low-Dropout CMOS Voltage Regulators in micro SMD Package
Manufacturer
National Semiconductor
Datasheet

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Part Number:
LP3986BL-3131/NOPB
Manufacturer:
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Quantity:
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© 2003 National Semiconductor Corporation
LP3986
Dual Micropower 150 mA Ultra Low-Dropout CMOS
Voltage Regulators in micro SMD Package
General Description
The LP3986 is a 150 mA dual low dropout regulator de-
signed for portable and wireless applications with demand-
ing performance and board space requirements.
The LP3986 is stable with a small 1 µF
capacitor requiring smallest possible board space.
The LP3986’s performance is optimized for battery powered
systems to deliver ultra low noise, extremely low dropout
voltage and low quiescent current independent of load cur-
rent. Regulator ground current increases very slightly in
dropout, further prolonging the battery life. Optional external
bypass capacitor reduces the output noise further without
slowing down the load transient response. Fast start-up time
is achieved by utilizing a speed-up circuit that actively pre-
charges the bypass capacitor. Power supply rejection is
better than 60 dB at low frequencies and 55 dB at 10 kHz.
High power supply rejection is maintained at low input volt-
age levels common to battery operated circuits.
The LP3986 is available in a micro SMD package. Perfor-
mance is specified for a −40˚C to +125˚C temperature
range. For single LDO applications, please refer to the
LP3985 datasheet.
Typical Application Circuit
±
30% ceramic output
DS200034
Features
n Miniature 8-I/O micro SMD package
n Stable with 1µF ceramic and high quality tantalum
n Fast turn-on
n Two independent regulators
n Logic controlled enable
n Over current and thermal protection
Key Specifications
n Guaranteed 150 mA output current per regulator
n 1nA typical quiescent current when both regulators in
n 60 mV typical dropout voltage at 150 mA output current
n 115 µA typical ground current
n 40 µV typical output noise
n 200 µs fast turn-on circuit
n −40˚C to +125˚C junction temperature
Applications
n CDMA cellular handsets
n GSM cellular handsets
n Portable information appliances
n Portable battery applications
output capacitors
shutdown mode
20003401
www.national.com
May 2003

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LP3986BL-3131 Summary of contents

Page 1

... For single LDO applications, please refer to the LP3985 datasheet. Typical Application Circuit © 2003 National Semiconductor Corporation Features n Miniature 8-I/O micro SMD package n Stable with 1µF ceramic and high quality tantalum output capacitors n Fast turn-on ± ...

Page 2

Block Diagram Pin Description Name V OUT2 EN 2 BYPASS GND GND OUT1 Note: The pin numbering scheme for the micro SMD package was revised in April 2002 to conform to JEDEC standard. Only ...

Page 3

... STD 2.92.9 STD 3.03.0 STD 3.13.1 STD 3.13.3 STD 3.33.3 STD Package LP3986 Supplied as 250 Units, Marking Tape and Reel 14 LP3986BL-2528 10 LP3986BL-2828 11 LP3986BL-285285 15 LP3986BL-2929 12 LP3986BL-3030 13 LP3986BL-3131 16 LP3986BL-3133 17 LP3986BL-3333 Package LP3986 Supplied as 250 Units, Marking Tape and Reel 14 LP3986TL-2528 10 LP3986TL-2828 11 LP3986TL-285285 15 LP3986TL-2929 12 LP3986TL-3030 13 LP3986TL-3131 16 LP3986TL-3133 17 LP3986TL-3333 3 LP3986 Supplied as 3000 ...

Page 4

... Absolute Maximum Ratings 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications OUT Junction Temperature Storage Temperature Pad Temp. (Note 3) Maximum Power Dissipation (Note 4) Electrical Characteristics Unless otherwise specified and limits appearing in standard typeface are for T temperature range for operation, − ...

Page 5

... Characteristics tables. Note 2: All voltages are with respect to the potential at the GND pin. Note 3: Additional information on pad temperature can be found in National Semiconductor Application Note (AN-1112). Note 4: The Absolute Maximum power dissipation depends on the ambient temperature and can be calculated using the formula: is the ambient temperature, and θ ...

Page 6

FIGURE 1. Line Regulation Input Test Signal FIGURE 2. PSRR Input Test Signal 6 20003408 20003409 ...

Page 7

Typical Performance Characteristics 0.01µ 0. 25˚C, both enable pins are tied OUT A Power Supply Rejection Ratio (C Power Supply Rejection Ratio (C Line Transient Response (C BP Unless otherwise ...

Page 8

Typical Performance Characteristics 0.01µ 0. 25˚C, both enable pins are tied OUT A Load Transient & Cross Talk (V Start-Up Time (C = 0.001, 0.01, 0.1µF) BP Enable Response (V ...

Page 9

Typical Performance Characteristics 0.01µ 0. 25˚C, both enable pins are tied OUT A Output Short Circuit Current at V Unless otherwise specified, C (Continued Output Short Circuit ...

Page 10

Application Hints EXTERNAL CAPACITORS Like any low-dropout regulator, the LP3986 requires external capacitors for regulator stability. The LP3986 is specifically designed for portable applications requiring minimum board space and smallest components. These capacitors must be correctly selected for good performance. ...

Page 11

... Application Hints (Continued) MICRO SMD MOUNTING The micro SMD package requires specific mounting tech- niques which are detailed in National Semiconductor Appli- cation Note (AN-1112). Referring to the section Surface Mount Technology (SMT) Assembly Considerations. For best results during assembly, alignment ordinals on the PC board may be used to facilitate placement of the micro SMD device ...

Page 12

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted micro SMD, 8 Bump NS Package Number BLA08CCC The dimensions for X1, X2 and X3 are as follows 1.55mm X2 = 1.55mm X3 = 0.995mm 12 ...

Page 13

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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