National Semiconductor LP3990 Technical data
查询LP3990MF-0.8供应商
LP3990
150mA Linear Voltage Regulator for Digital Applications
LP3990 150mA Linear Voltage Regulator for Digital Applications
November 2004
General Description
The LP3990 regulator is designed to meet the requirements
of portable, battery-powered systems providing an accurate
output voltage, low noise, and low quiescent current. The
LP3990 will provide a 0.8V output from the low input voltage
of 2V at up to 150mA load current. When switched into
shutdown mode via a logic signal at the enable pin, the
power consumption is reduced to virtually zero.
The LP3990 is designed to be stable with space saving
ceramic capacitors as small as 0.47µF.
Performance is specified for a -40˚C to 125˚C junction temperature range.
For output voltages other than 0.8V, 1.35V, 1.5V, 1.8V, 2.5V,
2.8V, or 3.3V please contact your local NSC sales office.
Features
n 1% Voltage Accuracy at Room Temperature
n Stable with Ceramic Capacitor
n Logic Controlled Enable
n No Noise Bypass Capacitor Required
n Thermal-Overload and Short-Circuit Protection
Typical Application Circuit
Key Specifications
n Input Voltage Range 2.0 to 6.0V
n Output Voltage Range 0.8 to 3.3V
n Output Current 150mA
n Output Stable - Capacitors 0.47uF
n Virtually Zero I
n Very Low I
n Low Output Noise 150uV
n PSRR 55dB at 1kHz
n Fast Start Up 105us
(Disabled)
Q
(Enabled) 43uA
Q
<
10nA
RMS
Package
All available in Lead Free option.
4 Pin micro SMD 1 mm x 1.28mm
6 pin LLP (SOT23 footprint)
SOT23 - 5
For other package options contact your NSC sales office.
Applications
n Cellular Handsets
n Hand-Held Information Appliances
20076801
© 2004 National Semiconductor Corporation DS200768 www.national.com
Pin Descriptions
LP3990
Pin No Symbol Name and Function
micro
LLP
5A23 V
2 A1 2 GND Common Ground. Connect to Pad.
1B15 V
6B21 VINVoltage Supply Input. A 1.0µF capacitor should be connected
3 4 N/C No Connection. Do not connect to any other pin.
4 N/C No Connection. Do not connect to any other pin.
Pad GND Common Ground. Connect to Pin 2.
SMD SOT23-5
Connection Diagrams
Packages
EN
Enable Input; Enables the Regulator when ≥ 0.95V.
Disables the Regulator when ≤ 0.4V.
Enable Input has 1MΩ pulldown resistor to GND.
OUT
Voltage output. A 0.47µF Low ESR Capacitor should be
connected to this Pin. Connect this output to the load circuit.
at this input.
Micro SMD, 4 Bump Package
See NS package number TLA04
LLP-6 Package
See NS package number SDE06A
20076803
20076806
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Connection Diagrams (Continued)
LP3990
SOT23 - 5 Package (MF)
See NS package number MF05A
20076808
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Ordering Information
LP3990
* Please contact Sales Office for Availability
Output
Voltage (V)
0.8 STD LP3990TL-0.8 LP3990TLX-0.8
1.2* STD LP3990TL-1.2 LP3990TLX-1.2
1.35 STD LP3990TL-1.35 LP3990TLX-1.35
1.5 STD LP3990TL-1.5 LP3990TLX-1.5
1.8 STD LP3990TL-1.8 LP3990TLX-1.8
2.5* STD LP3990TL-2.5 LP3990TLX-2.5
2.8 STD LP3990TL-2.8 LP3990TLX-2.8
3.3* STD LP3990TL-3.3 LP3990TLX-3.3
* Please contact Sales Office for Availability
Output
Voltage (V)
0.8 STD LP3990SD-0.8 LP3990SDX-0.8 L085B
1.2* STD LP3990SD-1.2 LP3990SDX-1.2 L086B
1.35* STD LP3990SD-1.35 LP3990SDX-1.35 L150B
1.5 STD LP3990SD-1.5 LP3990SDX-1.5 L087B
1.8 STD LP3990SD-1.8 LP3990SDX-1.8 L088B
2.5 STD LP3990SD-2.5 LP3990SDX-2.5 L090B
2.8* STD LP3990SD-2.8 LP3990SDX-2.8 L091B
3.3* STD LP3990SD-3.3 LP3990SDX-3.3 L092B
Grade
Grade
For micro SMD Package
LP3990 Supplied as 250
Units, Tape and Reel
For LLP-6 Package
LP3990 Supplied as 1000
Units, Tape and Reel
LP3990 Supplied as 3000
Units, Tape and Reel
LP3990 Supplied as 3000
Units, Tape and Reel Package Marking
Package Marking
For SOT23 - 5 Package
* Please contact Sales Office for Availability
Output
Voltage (V)
0.8* STD LP3990MF-0.8 LP3990MFX-0.8 SCCB
1.2* STD LP3990MF-1.2 LP3990MFX-1.2 SCDB
1.35* STD LP3990MF-1.35 LP3990MFX-1.35 SHRB
1.5* STD LP3990MF-1.5 LP3990MFX-1.5 SCEB
1.8* STD LP3990MF-1.8 LP3990MFX-1.8 SCFB
2.5* STD LP3990MF-2.5 LP3990MFX-2.5 SCJB
2.8* STD LP3990MF-2.8 LP3990MFX-2.8 SCKB
3.3* STD LP3990MF-3.3 LP3990MFX-3.3 SCLB
Grade
LP3990 Supplied as 1000
Units, Tape and Reel
LP3990 Supplied as 3000
Units, Tape and Reel Package Marking
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