LP2989
Micropower/Low Noise, 500 mA Ultra Low-Dropout
Regulator
For Use with Ceramic Output Capacitors
General Description
The LP2989 is a fixed-output 500 mA precision LDO regu-
lator designed for use with ceramic output capacitors.
Output noise can be reduced to 18V (typical) by connecting
an external 10 nF capacitor to the bypass pin.
Using an optimized VIP
TM
(Vertically Integrated PNP) pro-
cess, the LP2989 delivers superior performance:
Dropout Voltage: Typically 310 mV
@
500 mA load, and 1
mV
@
100 A load.
Ground Pin Current: Typically 3 mA
@
500 mA load, and
110 A
@
100 A load.
Sleep Mode: The LP2989 draws less than 0.8 A quiescent
current when shutdown pin is pulled low.
Error Flag: The built-in error flag goes low when the output
drops approximately 5% below nominal.
Precision Output: Guaranteed output voltage accuracy is
0.75% ("A" grade) and 1.25% (standard grade) at room
temperature.
For output voltages
<
2V, see LP2989LV datasheet.
Features
n
Ultra low dropout voltage
n
Guaranteed 500 mA continuous output current
n
Very low output noise with external capacitor
n
SO-8, Mini SO-8, 8 Lead LLP surface mount packages
n
<
0.8 A quiescent current when shutdown
n
Low ground pin current at all loads
n
0.75% output voltage accuracy ("A" grade)
n
High peak current capability (800 mA typical)
n
Wide supply voltage range (16V max)
n
Overtemperature/overcurrent protection
n
-40C to +125C junction temperature range
Applications
n
Notebook/Desktop PC
n
PDA/Palmtop Computer
n
Wireless Communication Terminals
n
SMPS Post-Regulator
Block Diagram
10133901
VIP
TM
is a trademark of National Semiconductor Corporation.
June 2002
LP2989
Micropower/Low
Noise,
500
mA
Ultra
Low-Dropout
Regulator
For
Use
with
Ceramic
Output
Capacitors
2002 National Semiconductor Corporation
DS101339
www.national.com
Connection Diagrams
Surface Mount Packages:
8 Lead LLP Surface Mount Package
10133902
SO-8/Mini SO-8 Package
See NS Package Drawing Numbers M08A/MUA08A
10133950
Top View
See NS Package Number LDC08A
Basic Application Circuit
10133903
*Capacitance values shown are minimum required to assure stability, but may be increased without limit. Larger output capacitor provides improved dynamic
response. See Application Hints.
**Shutdown must be actively terminated (see App. Hints). Tie to INPUT (Pin4) if not used
LP2989
www.national.com
2
Ordering Information
TABLE 1. Package Marking and Ordering Information
Output Voltage
Grade
Order Information
Package Marking
Supplied as:
8 Lead LLP
2.5
A
LP2989AILD-2.5
L01FA
1000 Units on Tape and Reel
2.5
A
LP2989AILDX-2.5
L01FA
4500 Units on Tape and Reel
2.5
STD
LP2989ILD-2.5
L01FAB
1000 Units on Tape and Reel
2.5
STD
LP2989ILDX-2.5
L01FAB
4500 Units on Tape and Reel
2.8
A
LP2989AILD-2.8
L000A
1000 Units on Tape and Reel
2.8
A
LP2989AILDX-2.8
L000A
4500 Units on Tape and Reel
2.8
STD
LP2989ILD-2.8
L000AB
1000 Units on Tape and Reel
2.8
STD
LP2989ILDX-2.8
L000AB
4500 Units on Tape and Reel
2.85
A
LP2989AILD-285
L01TA
1000 Units on Tape and Reel
2.85
A
LP2989AILDX-285
L01TA
4500 Units on Tape and Reel
2.85
STD
LP2989ILD-285
L01TAB
1000 Units on Tape and Reel
2.85
STD
LP2989ILDX-285
L01TAB
4500 Units on Tape and Reel
3.0
A
LP2989AILD-3.0
L01HA
1000 Units on Tape and Reel
3.0
A
LP2989AILDX-3.0
L01HA
4500 Units on Tape and Reel
3.0
STD
LP2989ILD-3.0
L01HAB
1000 Units on Tape and Reel
3.0
STD
LP2989ILDX-3.0
L01HAB
4500 Units on Tape and Reel
3.3
A
LP2989AILD-3.3
L01JA
1000 Units on Tape and Reel
3.3
A
LP2989AILDX-3.3
L01JA
4500 Units on Tape and Reel
3.3
STD
LP2989ILD-3.3
L01JAB
1000 Units on Tape and Reel
3.3
STD
LP2989ILDX-3.3
L01JAB
4500 Units on Tape and Reel
3.6
A
LP2989AILD-3.6
L019A
1000 Units on Tape and Reel
3.6
A
LP2989AILDX-3.6
L019A
4500 Units on Tape and Reel
3.6
STD
LP2989ILD-3.6
L019AB
1000 Units on Tape and Reel
3.6
STD
LP2989ILDX-3.6
L019AB
4500 Units on Tape and Reel
4.0
A
LP2989AILD-4.0
L01LA
1000 Units on Tape and Reel
4.0
A
LP2989AILDX-4.0
L01LA
4500 Units on Tape and Reel
4.0
STD
LP2989ILD-4.0
L01LAB
1000 Units on Tape and Reel
4.0
STD
LP2989ILDX-4.0
L01LAB
4500 Units on Tape and Reel
5.0
A
LP2989AILD-5.0
L01KA
1000 Units on Tape and Reel
5.0
A
LP2989AILDX-5.0
L01KA
4500 Units on Tape and Reel
5.0
STD
LP2989ILD-5.0
L01KAB
1000 Units on Tape and Reel
5.0
STD
LP2989ILDX-5.0
L01KAB
4500 Units on Tape and Reel
8 Lead MSOP (MM)
2.5
A
LP2989AIMM-2.5
LA0A
1000 Units on Tape and Reel
2.5
A
LP2989AIMMX-2.5
LA0A
3500 Units on Tape and Reel
2.5
STD
LP2989IMM-2.5
LA0B
1000 Units on Tape and Reel
2.5
STD
LP2989IMMX-2.5
LA0B
3500 Units on Tape and Reel
2.8
A
LP2989AIMM-2.8
LA6A
1000 Units on Tape and Reel
2.8
A
LP2989AIMMX-2.8
LA6A
3500 Units on Tape and Reel
2.8
STD
LP2989IMM-2.8
LA6B
1000 Units on Tape and Reel
2.8
STD
LP2989IMMX-2.8
LA6B
3500 Units on Tape and Reel
3.0
A
LP2989AIMM-3.0
LA1A
1000 Units on Tape and Reel
3.0
A
LP2989AIMMX-3.0
LA1A
3500 Units on Tape and Reel
3.0
STD
LP2989IMM-3.0
LA1B
1000 Units on Tape and Reel
3.0
STD
LP2989IMMX-3.0
LA1B
3500 Units on Tape and Reel
3.3
A
LP2989AIMM-3.3
LA2A
1000 Units on Tape and Reel
3.3
A
LP2989AIMMX-3.3
LA2A
3500 Units on Tape and Reel
LP2989
www.national.com
3
Ordering Information
(Continued)
TABLE 1. Package Marking and Ordering Information (Continued)
Output Voltage
Grade
Order Information
Package Marking
Supplied as:
3.3
STD
LP2989IMM-3.3
LA2B
1000 Units on Tape and Reel
3.3
STD
LP2989IMMX-3.3
LA2B
3500 Units on Tape and Reel
5.0
A
LP2989AIMM-5.0
LA4A
1000 Units on Tape and Reel
5.0
A
LP2989AIMMX-5.0
LA4A
3500 Units on Tape and Reel
5.0
STD
LP2989IMM-5.0
LA4B
1000 Units on Tape and Reel
5.0
STD
LP2989IMMX-5.0
LA4B
3500 Units on Tape and Reel
LP2989
www.national.com
4
Ordering Information
(Continued)
TABLE 1. Package Marking and Ordering Information (Continued)
Output Voltage
Grade
Order Information
Package Marking
Supplied as:
SO-8 (M)
2.5
A
LP2989AIMX-2.5
LP2989AIM2.5
2500 Units on Tape and Reel
2.5
A
LP2989AIM-2.5
LP2989AIM2.5
Shipped in Anti-Static Rails
2.5
STD
LP2989IMX-2.5
LP2989IM2.5
2500 Units on Tape and Reel
2.5
STD
LP2989IM-2.5
LP2989IM2.5
Shipped in Anti-Static Rails
3.3
A
LP2989AIMX-3.3
LP2989AIM3.3
2500 Units on Tape and Reel
3.3
A
LP2989AIM-3.3
LP2989AIM3.3
Shipped in Anti-Static Rails
3.3
STD
LP2989IMX-3.3
LP2989IM3.3
2500 Units on Tape and Reel
3.3
STD
LP2989IM-3.3
LP2989IM3.3
Shipped in Anti-Static Rails
5.0
A
LP2989AIMX-5.0
LP2989AIM5.0
2500 Units on Tape and Reel
5.0
A
LP2989AIM-5.0
LP2989AIM5.0
Shipped in Anti-Static Rails
5.0
STD
LP2989IMX-5.0
LP2989IM5.0
2500 Units on Tape and Reel
5.0
STD
LP2989IM-5.0
LP2989IM5.0
Shipped in Anti-Static Rails
For output voltages
<
2V, see LP2989LV datasheet.
LP2989
www.national.com
5
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