LP3990 150mA Linear Voltage Regulator for Digital Applications
November 2004
LP3990
150mA Linear Voltage Regulator for Digital Applications
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 tem-
perature 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.
Key Specifications
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Input Voltage Range
Output Voltage Range
Output Current
Output Stable - Capacitors
Virtually Zero I
Q
(Disabled)
Very Low I
Q
(Enabled)
Low Output Noise
PSRR
Fast Start Up
2.0 to 6.0V
0.8 to 3.3V
150mA
0.47uF
<
10nA
43uA
150uV
RMS
55dB at 1kHz
105us
Package
All available in Lead Free option.
4 Pin micro SMD
6 pin LLP (SOT23 footprint)
SOT23 - 5
For other package options contact your NSC sales office.
Features
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1% Voltage Accuracy at Room Temperature
Stable with Ceramic Capacitor
Logic Controlled Enable
No Noise Bypass Capacitor Required
Thermal-Overload and Short-Circuit Protection
1 mm x 1.28mm
Applications
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Cellular Handsets
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Hand-Held Information Appliances
Typical Application Circuit
20076801
© 2004 National Semiconductor Corporation
DS200768
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LP3990
Pin Descriptions
Packages
Pin No
LLP
5
micro
SMD
A2
SOT23-5
3
V
EN
Enable Input; Enables the Regulator when
≥
0.95V.
Disables the Regulator when
≤
0.4V.
Enable Input has 1MΩ pulldown resistor to GND.
Common Ground. Connect to Pad.
Voltage output. A 0.47µF Low ESR Capacitor should be
connected to this Pin. Connect this output to the load circuit.
Voltage Supply Input. A 1.0µF capacitor should be connected
at this input.
No Connection. Do not connect to any other pin.
No Connection. Do not connect to any other pin.
Common Ground. Connect to Pin 2.
Symbol
Name and Function
2
1
6
3
4
Pad
A1
B1
B2
2
5
1
4
GND
V
OUT
V
IN
N/C
N/C
GND
Connection Diagrams
Micro SMD, 4 Bump Package
20076803
See NS package number TLA04
LLP-6 Package
20076806
See NS package number SDE06A
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2
LP3990
Connection Diagrams
(Continued)
SOT23 - 5 Package (MF)
20076808
See NS package number MF05A
3
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LP3990
Ordering Information
For micro SMD Package
* Please contact Sales Office for Availability
Output
Voltage (V)
0.8
1.2*
1.35
1.5
1.8
2.5*
2.8
3.3*
Grade
STD
STD
STD
STD
STD
STD
STD
STD
LP3990 Supplied as 250
Units, Tape and Reel
LP3990TL-0.8
LP3990TL-1.2
LP3990TL-1.35
LP3990TL-1.5
LP3990TL-1.8
LP3990TL-2.5
LP3990TL-2.8
LP3990TL-3.3
For LLP-6 Package
* Please contact Sales Office for Availability
Output
Voltage (V)
0.8
1.2*
1.35*
1.5
1.8
2.5
2.8*
3.3*
Grade
STD
STD
STD
STD
STD
STD
STD
STD
LP3990 Supplied as 1000
Units, Tape and Reel
LP3990SD-0.8
LP3990SD-1.2
LP3990SD-1.35
LP3990SD-1.5
LP3990SD-1.8
LP3990SD-2.5
LP3990SD-2.8
LP3990SD-3.3
For SOT23 - 5 Package
* Please contact Sales Office for Availability
Output
Voltage (V)
0.8*
1.2*
1.35*
1.5*
1.8*
2.5*
2.8*
3.3*
Grade
STD
STD
STD
STD
STD
STD
STD
STD
LP3990 Supplied as 1000
Units, Tape and Reel
LP3990MF-0.8
LP3990MF-1.2
LP3990MF-1.35
LP3990MF-1.5
LP3990MF-1.8
LP3990MF-2.5
LP3990MF-2.8
LP3990MF-3.3
LP3990 Supplied as 3000
Units, Tape and Reel
LP3990MFX-0.8
LP3990MFX-1.2
LP3990MFX-1.35
LP3990MFX-1.5
LP3990MFX-1.8
LP3990MFX-2.5
LP3990MFX-2.8
LP3990MFX-3.3
Package Marking
SCCB
SCDB
SHRB
SCEB
SCFB
SCJB
SCKB
SCLB
LP3990 Supplied as 3000
Units, Tape and Reel
LP3990SDX-0.8
LP3990SDX-1.2
LP3990SDX-1.35
LP3990SDX-1.5
LP3990SDX-1.8
LP3990SDX-2.5
LP3990SDX-2.8
LP3990SDX-3.3
Package Marking
L085B
L086B
L150B
L087B
L088B
L090B
L091B
L092B
LP3990 Supplied as 3000
Units, Tape and Reel
LP3990TLX-0.8
LP3990TLX-1.2
LP3990TLX-1.35
LP3990TLX-1.5
LP3990TLX-1.8
LP3990TLX-2.5
LP3990TLX-2.8
LP3990TLX-3.3
Package Marking
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4
LP3990
Absolute Maximum Ratings
(Notes 1, 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Input Voltage
Output Voltage
Enable Input Voltage
Junction Temperature
Lead/Pad Temp. (Note 3)
LLP/SOT23
micro SMD
Storage Temperature
Continuous Power Dissipation
Internally Limited(Note 4)
235˚C
260˚C
-65 to 150˚C
-0.3 to 6.5V
-0.3 to (V
IN
+ 0.3V) to
6.5V (max)
-0.3 to (V
IN
+ 0.3V) to
6.5V (max)
150˚C
ESD (Note 5)
Human Body Model
Machine Model
2KV
200V
Operating Ratings
(Note 1)
Input Voltage
Enable Input Voltage
Junction Temperature
Ambient Temperature T
A
Range
(Note 6)
2V to 6V
0 to (V
IN
+ 0.3V) to
6.0V (max)
-40˚C to 125˚C
-40˚C to 85˚C
Thermal Properties
(Note 1)
Junction To Ambient Thermal
Resistance(Note 8)
θ
JA
(LLP-6)
θ
JA
(microSMD)
θ
JA
SOT23-5
88˚C/W
220˚C/W
220˚C/W
Electrical Characteristics
Unless otherwise noted, V
EN
=950mV, V
IN
= V
OUT
+ 1.0V, or 2.0V, whichever is higher. C
IN
= 1 µF, I
OUT
= 1 mA, C
OUT
=0.47
µF. Typical values and limits appearing in normal type apply for T
J
= 27˚C. Limits appearing in
boldface
type apply over the
full junction temperature range for operation, −40 to +125˚C. (Note 13)
Symbol
V
IN
∆V
OUT
Parameter
Input Voltage
Output Voltage Tolerance
(Note 14)
I
LOAD
= 1 mA
Over full line
and load
regulation.
Line Regulation Error
Load Regulation Error
I
OUT
= 1mA
to 150mA
Micro SMD
LLP
Micro SMD
LLP
0.02
0.002
0.003
0.0005
0.002
120
0
43
65
0.002
550
150
f = 1kHz, I
OUT
= 1mA to 150mA
f = 10kHz, I
OUT
= 150mA
55
35
80
120
0.2
1000
mA
mA
dB
µA
Conditions
Typ
Limit
Min
2
-1
-1.5
-2.5
-3
-0.1
-0.005
-0.008
-0.002
-0.005
Max
6
+1
+1.5
+2.5
+3
0.1
0.005
0.008
0.002
0.005
%/mA
%/V
%
Units
V
V
IN
= (V
OUT(NOM)
+ 1.0V) to 6.0V,
V
OUT
= 0.8 to 1.95V
MicroSMD
V
OUT
= 0.8 to 1.95V
LLP, SOT-23
V
OUT
= 2.0 to 3.3V
MicroSMD
V
OUT
= 2.0 to 3.3V
LLP, SOT-23
V
DO
I
LOAD
I
Q
Dropout Voltage
Load Current
Quiescent Current
I
OUT
= 150mA
(Note 7)
(Notes 9, 10)
V
EN
= 950mV, I
OUT
= 0mA
V
EN
= 950mV, I
OUT
= 150mA
V
EN
= 0.4V
mV
µA
I
SC
I
OUT
PSRR
Short Circuit Current Limit
Maximum Output Current
Power Supply Rejection Ratio
(Note 11)
5
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