LP3986TLX-3030 National Semiconductor, LP3986TLX-3030 Datasheet

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LP3986TLX-3030

Manufacturer Part Number
LP3986TLX-3030
Description
Dual Micropower 150 mA Ultra Low-Dropout CMOS Voltage Regulators in micro SMD Package
Manufacturer
National Semiconductor
Datasheet

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© 2007 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 designed
for portable and wireless applications with demanding perfor-
mance and board space requirements.
The LP3986 is stable with a small 1 µF ±30% ceramic output
capacitor requiring smallest possible board space.
The LP3986's performance is optimized for battery powered
systems to deliver ultra low noise, extremely low dropout volt-
age and low quiescent current independent of load current.
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 bet-
ter than 60 dB at low frequencies and 55 dB at 10 kHz. High
power supply rejection is maintained at low input voltage lev-
els 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
200034
Features
Key Specifications
Applications
Miniature 8-I/O micro SMD package
Stable with 1µF ceramic and high quality tantalum output
capacitors
Fast turn-on
Two independent regulators
Logic controlled enable
Over current and thermal protection
Guaranteed 150 mA output current per regulator
1nA typical quiescent current when both regulators in
shutdown mode
60 mV typical dropout voltage at 150 mA output current
115 µA typical ground current
40 µV typical output noise
200 µs fast turn-on circuit
−40°C to +125°C junction temperature
CDMA cellular handsets
GSM cellular handsets
Portable information appliances
Portable battery applications
20003401
February 2007
www.national.com

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LP3986TLX-3030 Summary of contents

Page 1

... 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 © 2007 National Semiconductor Corporation Features ■ Miniature 8-I/O micro SMD package ■ ...

Page 2

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

Page 3

... LP3986 Supplied as 250 Units, Tape Marking and Reel 27 LP3986TL-2525 14 LP3986TL-2528 30 LP3986TL-2518 28 LP3986TL-2626 25 LP3986TL-2818 10 LP3986TL-2828 11 LP3986TL-285285 15 LP3986TL-2929 26 LP3986TL-3028 12 LP3986TL-3030 13 LP3986TL-3131 16 LP3986TL-3133 17 LP3986TL-3333 3 LP3986 Supplied as 3000 Units, Tape and Reel LP3986TLX-2525 LP3986TLX-2528 LP3986TLX-2518 LP3986TLX-2626 LP3986TLX-2818 LP3986TLX-2828 LP3986TLX285285 LP3986TLX-2929 LP3986TLX-3028 LP3986TLX-3030 LP3986TLX-3131 LP3986TLX-3133 LP3986TLX-3333 20003403 www.national.com ...

Page 4

... Absolute Maximum Ratings 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) Electrical Characteristics Unless otherwise specified limits appearing in standard typeface are for T range for operation, − ...

Page 5

... Electrical 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

Test Signals Typical Performance Characteristics 0. 25°C, both enable pins are tied OUT A Power Supply Rejection Ratio (C www.national.com FIGURE 1. Line Regulation Input Test Signal FIGURE 2. PSRR ...

Page 7

Power Supply Rejection Ratio (C BP Line Transient Response (C = 0.001µF) BP Load Transient & Cross Talk ( 0.1µF) Output Noise Spectral Density 20003448 Line Transient Response (C 20003413 + 0.2V) Load Transient & Cross ...

Page 8

Start-Up Time (C = 0.001, 0.01, 0.1µF) BP Enable Response (V IN Output Short Circuit Current at V www.national.com 20003411 = V + 0.2V) OUT 20003415 = 6V Output Short Circuit Current 20003465 8 Enable Response ( ...

Page 9

... MICRO SMD MOUNTING The micro SMD package requires specific mounting tech- ≊ 2.2µF) 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 10

MICRO SMD LIGHT SENSITIVITY Exposing the micro SMD device to direct sunlight will cause misoperation of the device. Light sources such as halogen lamps can effect electrical performance if brought near to the device. The wavelengths which have most detrimental ...

Page 11

Physical Dimensions inches (millimeters) unless otherwise noted The dimensions for X1, X2 and X3 are as follows: micro SMD, 8 Bump NS Package Number TL08CCA X1 = 1.55mm X2 = 1.55mm X3 = 0.600mm 11 www.national.com ...

Page 12

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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