LP3991TLX-2.8/NOPB National Semiconductor, LP3991TLX-2.8/NOPB Datasheet

IC VREG 300MA 2.8V 4-USMD

LP3991TLX-2.8/NOPB

Manufacturer Part Number
LP3991TLX-2.8/NOPB
Description
IC VREG 300MA 2.8V 4-USMD
Manufacturer
National Semiconductor
Series
PowerWise®r
Datasheet

Specifications of LP3991TLX-2.8/NOPB

Regulator Topology
Positive Fixed
Voltage - Output
2.8V
Voltage - Input
Up to 4V
Voltage - Dropout (typical)
0.075V @ 300mA
Number Of Regulators
1
Current - Output
300mA (Min)
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
4-MicroSMD
For Use With
LP3991TL-1.8EV - BOARD EVALUATION LP3991TL-1.8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Limit (min)
-
Other names
LP3991TLX-2.8

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LP3991TLX-2.8/NOPB
Manufacturer:
Texas Instruments
Quantity:
10 000
© 2011 National Semiconductor Corporation
300mA Linear Voltage Regulator for Digital Applications
General Description
Operating from a minimum input voltage of 1.65V, the LP3991
regulator has been designed to provide fixed stable output
voltages for load currents up to 300mA. This device is suitable
where accurate, low voltages are required from low input volt-
age sources and is therefore suitable for post regulation of
switched mode regulators. In such applications, significant
improvements in performance and EMI can be realized, with
little reduction in overall efficiency. The LP3991 will provide
fixed outputs as low as 1.2V from a wide input range of 1.65V
to 4.0V Using the enable pin, the device may be controlled to
provide a shutdown state, in which negligible supply current
is drawn.
The LP3991 is designed to be stable with space saving ce-
ramic capacitors as small as 0402 case size.
Performance is specified for a -40°C to 125°C junction tem-
perature range.
For output voltage options please contact your local NSC
sales office.
Typical Application Circuit
201100
LP3991
Features
Package
For other package options contact your NSC sales office.
Applications
4 pin micro SMD (0.963mm x 1.446mm)
Operation from 1.65V to 4.0V Input
1% accuracy at room temperature
Output Voltage from 1.2V to 2.8V
125mV Dropout at 300mA load
50µA Quiescent Current at 1mA Load
Inrush Current controlled to 600mA
PSRR 65dB at 1kHz
100µs Start-Up time for 1.5V V
Stable with Ceramic Capacitors as small as 0402
Thermal-Overload and Short-Circuit Protection
Post DC/DC Regulator
Battery Operated Devices
Hand-Held Information Appliances
20110002
OUT
January 19, 2011
www.national.com

Related parts for LP3991TLX-2.8/NOPB

LP3991TLX-2.8/NOPB Summary of contents

Page 1

... Performance is specified for a -40°C to 125°C junction tem- perature range. For output voltage options please contact your local NSC sales office. Typical Application Circuit © 2011 National Semiconductor Corporation LP3991 Features ■ Operation from 1.65V to 4.0V Input ■ ...

Page 2

... LP3991 Supplied as 250 Units, Tape and Reel LP3991TL-0.8 LP3991TL-1.2 LP3991TL-1.3 LP3991TL-1.5 LP3991TL-1.55 LP3991TL-1.7 LP3991TL-1.8 LP3991TL-2.0 LP3991TL-2.5 LP3991TL-2.8 LP3991TL-3.0 2 ≥ 0.95V. ≤ 0.4V. 20110006 LP3991 Supplied as 3000 Units, Tape and Reel LP3991TLX-0.8 LP3991TLX-1.2 LP3991TLX-1.3 LP3991TLX-1.5 LP3991TLX-1.55 LP3991TLX-1.7 LP3991TLX-1.8 LP3991TLX-2.0 LP3991TLX-2.5 LP3991TLX-2.8 LP3991TLX-3.0 ...

Page 3

... Absolute Maximum Ratings (Note 1, Note 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications Pins: Voltage to GND IN OUT V Pin: Voltage to GND -0 Junction Temperature Lead/Pad Temp. (Note 3) Micro SMD Storage Temperature Continuous Power Dissipation ...

Page 4

Electrical Characteristics con't. Unless otherwise noted, V =950mV Typical values and limits appearing in normal type apply for T temperature range for operation, −40 to +125°C. Symbol Parameter Enable Control Characteristics I Maximum Input Current ...

Page 5

Output Capacitor, Recommended Specifications Parameter C Output Capacitor OUT Note 17: The capacitor tolerance should be 30% or better over temperature. The full operating conditions for the application should be considered when selecting a suitable capacitor to ensure that the ...

Page 6

Typical Performance Characteristics. Ceramic 0.5V or 1.8V whichever is greater OUT(NOM) Output Voltage Change vs Temperature Ground Current vs Load Current Dropout Voltage www.national.com Unless otherwise specified 25° 1.5V , ...

Page 7

Typical Performance Characteristics con' 4.7µF Ceramic OUT IN OUT(NOM Load Transient, V OUT Line Transient, I LOAD Enable Characteristics Unless otherwise specified 0.5V or 1.8V whichever is greater, T ...

Page 8

Typical Performance Characteristics con' 4.7µF Ceramic OUT IN OUT(NOM Power Supply Rejection Ratio Noise Density www.national.com Unless otherwise specified 0.5V or 1.8V whichever is greater 20110025 20110028 ...

Page 9

Application Information EXTERNAL CAPACITORS In common with most regulators, the LP3991 requires exter- nal capacitors for regulator stability. The LP3991 is specifi- cally designed for portable applications requiring minimum board space and smallest components. These capacitors must be correctly selected ...

Page 10

... SMD MOUNTING The micro SMD package requires specific mounting tech- niques which are detailed in the National Semiconductor Application Note (AN-1112). Referring to the section Surface Mount Technology (SMT) Assenbly Considerations, it should be noted that the pad style which must be used with the 4 pin package is NSMD (non-solder mask defined) type ...

Page 11

Physical Dimensions inches (millimeters) unless otherwise noted 4 Bump Thin micro SMD, Large Bump NS Package Number TLA04ZTA The Dimensions for X1, X2 and X3 as given as 0.963mm ± 0.030mm X2 = 1.446mm ± 0.03mm X3 = ...

Page 12

... 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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