LP2992
Micropower 250 mA Low-Noise Ultra Low-Dropout
Regulator in SOT-23 and LLP Packages
Designed for Use with Very Low ESR Output Capacitors
General Description
The LP2992 is a 250 mA, fixed-output voltage regulator
designed to provide ultra low-dropout and low noise in bat-
tery powered applications.
Using an optimized VIP
TM
(Vertically Integrated PNP) pro-
cess, the LP2992 delivers unequalled performance in all
specifications critical to battery-powered designs:
Dropout Voltage: Typically 450 mV
@
250 mA load, and
5 mV
@
1 mA load.
Ground Pin Current: Typically 1500 A
@
250 mA load, and
75 A
@
1 mA load.
Enhanced Stability: The LP2992 is stable with output ca-
pacitor ESR as low as 5 m
, which allows the use of ceramic
capacitors on the output.
Sleep Mode: Less than 1 A quiescent current when
ON/OFF pin is pulled low.
Smallest Possible Size: SOT-23 and LLP packages use
absolute minimum board space.
Precision Output: 1% tolerance output voltages available
(A grade).
Low Noise: By adding a 10 nF bypass capacitor, output
noise can be reduced to 30 V (typical).
Multiple voltage options, from 1.5V to 5.0V, are available as
standard products. Consult factory for custom voltages.
Features
n
Ultra low dropout voltage
n
Guaranteed 250 mA output current
n
Smallest possible size (SOT-23, LLP package)
n
Requires minimum external components
n
Stable with low-ESR output capacitor
n
<
1 A quiescent current when shut down
n
Low ground pin current at all loads
n
Output voltage accuracy 1% (A Grade)
n
High peak current capability
n
Wide supply voltage range (16V max)
n
Low Z
OUT
: 0.3
typical (10 Hz to 1 MHz)
n
Overtemperature/overcurrent protection
n
-40C to +125C junction temperature range
n
Custom voltages available
Applications
n
Cellular Phone
n
Palmtop/Laptop Computer
n
Personal Digital Assistant (PDA)
n
Camcorder, Personal Stereo, Camera
Block Diagram
20029401
VIP
TM
is a trademark of National Semiconductor Corporation.
June 2002
LP2992
Micropower
250
mA
Low-Noise
Ultra
Low-Dropout
Regulator
in
SOT
-23
and
LLP
Packages
2002 National Semiconductor Corporation
DS200294
www.national.com
Basic Application Circuit
20029402
*ON/OFF input must be actively terminated. Tie to V
IN
if this function is not to be used.
**Minimum capacitance is shown to ensure stability (may be increased without limit). Ceramic capacitor required for output (see Application Hints).
***Reduces output noise (may be omitted if application is not noise critical). Use ceramic or film type with very low leakage current (see Application Hints).
Connection Diagrams
5-Lead Small Outline Package (M5)
6-Lead LLP Package (LD)
20029403
Top View
See NS Package Number MF05A
For ordering information see Table 1
20029446
Top View
See NS Package Number NLDBA006
Outline Drawing LDE06A
LP2992
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2
Ordering Information
TABLE 1. Package Marking and Ordering Information
Output Voltage
(V)
Grade
Order Information
Package
Marking
Supplied as:
5-Lead Small Outline Package (M5)
1.5
A
LP2992AIM5X-1.5
LFBA
3000 Units on Tape and Reel
1.5
A
LP2992AIM5-1.5
LFBA
1000 Units on Tape and Reel
1.5
STD
LP2992IM5X-1.5
LFBB
3000 Units on Tape and Reel
1.5
STD
LP2992IM5-1.5
LFBB
1000 Units on Tape and Reel
1.8
A
LP2992AIM5X-1.8
LFCA
3000 Units on Tape and Reel
1.8
A
LP2992AIM5-1.8
LFCA
1000 Units on Tape and Reel
1.8
STD
LP2992IM5X-1.8
LFCB
3000 Units on Tape and Reel
1.8
STD
LP2992IM5-1.8
LFCB
1000 Units on Tape and Reel
2.5
A
LP2992AIM5X-2.5
LFDA
3000 Units on Tape and Reel
2.5
A
LP2992AIM5-2.5
LFDA
1000 Units on Tape and Reel
2.5
STD
LP2992IM5X-2.5
LFDB
3000 Units on Tape and Reel
2.5
STD
LP2992IM5-2.5
LFDB
1000 Units on Tape and Reel
3.0
A
LP2992AIM5X-3.0
LF8A
3000 Units on Tape and Reel
3.0
A
LP2992AIM5-3.0
LF8A
1000 Units on Tape and Reel
3.0
STD
LP2992IM5X-3.0
LF8B
3000 Units on Tape and Reel
3.0
STD
LP2992IM5-3.0
LF8B
1000 Units on Tape and Reel
3.3
A
LP2992AIM5X-3.3
LFEA
3000 Units on Tape and Reel
3.3
A
LP2992AIM5-3.3
LFEA
1000 Units on Tape and Reel
3.3
STD
LP2992IM5X-3.3
LFEB
3000 Units on Tape and Reel
3.3
STD
LP2992IM5-3.3
LFEB
1000 Units on Tape and Reel
5.0
A
LP2992AIM5X-5.0
LFFA
3000 Units on Tape and Reel
5.0
A
LP2992AIM5-5.0
LFFA
1000 Units on Tape and Reel
5.0
STD
LP2992IM5X-5.0
LFFB
3000 Units on Tape and Reel
5.0
STD
LP2992IM5-5.0
LFFB
1000 Units on Tape and Reel
6-Lead LLP Package (LDE06A)
1.5
A
LP2992AILDX-1.5
L011A
4500 Units on Tape and Reel
1.5
A
LP2992AILD-1.5
L011A
1000 Units on Tape and Reel
1.5
STD
LP2992ILDX-1.5
L011AB
4500 Units on Tape and Reel
1.5
STD
LP2992ILD-1.5
L011AB
1000 Units on Tape and Reel
1.8
A
LP2992AILDX-1.8
L012A
4500 Units on Tape and Reel
1.8
A
LP2992AILD-1.8
L012A
1000 Units on Tape and Reel
1.8
STD
LP2992ILDX-1.8
L012AB
4500 Units on Tape and Reel
1.8
STD
LP2992ILD-1.8
L012AB
1000 Units on Tape and Reel
2.5
A
LP2992AILDX-2.5
L013A
4500 Units on Tape and Reel
2.5
A
LP2992AILD-2.5
L013A
1000 Units on Tape and Reel
2.5
STD
LP2992ILDX-2.5
L013AB
4500 Units on Tape and Reel
2.5
STD
LP2992ILD-2.5
L013AB
1000 Units on Tape and Reel
3.3
A
LP2992AILDX-3.3
L014A
4500 Units on Tape and Reel
3.3
A
LP2992AILD-3.3
L014A
1000 Units on Tape and Reel
3.3
STD
LP2992ILDX-3.3
L014AB
4500 Units on Tape and Reel
3.3
STD
LP2992ILD-3.3
L014AB
1000 Units on Tape and Reel
5.0
A
LP2992AILDX-5.0
L015A
4500 Units on Tape and Reel
5.0
A
LP2992AILD-5.0
L015A
1000 Units on Tape and Reel
5.0
STD
LP2992ILDX-5.0
L015AB
4500 Units on Tape and Reel
5.0
STD
LP2992ILD-5.0
L015AB
1000 Units on Tape and Reel
LP2992
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3
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature Range
-65C to +150C
Operating Junction Temperature
Range
-40C to +125C
Lead Temp. (Soldering, 5 sec.)
260C
ESD Rating (Note 2)
2 kV
Power Dissipation (Note 3)
Internally Limited
Input Supply Voltage (Survival)
-0.3V to +16V
Input Supply Voltage (Operating)
2.2V to +16V
Shutdown Input Voltage (Survival)
-0.3V to +16V
Output Voltage (Survival, (Note 4))
-0.3V to +9V
I
OUT
(Survival)
Short Circuit
Protected
Input-Output Voltage (Survival,
-0.3V to +16V
(Note 5))
Electrical Characteristics
Limits in standard typeface are for T
J
= 25C. and limits in boldface type apply over the full operating temperature range. Un-
less otherwise specified: V
IN
= V
O
(NOM) + 1V, I
L
= 1 mA, C
IN
= 1 F, C
OUT
= 4.7 F, V
ON/OFF
= 2V.
Symbol
Parameter
Conditions
Typ
LP2992AI-X.X
LP2992I-X.X
Units
(Note 6)
(Note 6)
Min
Max
Min
Max
V
O
Output Voltage
Tolerance
I
L
= 1 mA
-1.0
1.0
-1.5
1.5
%V
NOM
1 mA
I
L
50 mA
-1.5
1.5
-2.5
2.5
-2.5
2.5
-3.5
3.5
1 mA
I
L
250 mA
-3.5
3.5
-4.0
4.0
-4.5
4.5
-5.0
5.0
Output Voltage
V
O
(NOM)+1V
V
IN
16V
0.007
0.014
0.014
%/V
Line Regulation
0.032
0.032
V
IN
(min)
Minimum input voltage
required to maintain
outpout regulation
2.05
2.20
2.20
V
V
IN
V
O
Dropout Voltage
(Note 7)
I
L
= 0
0.5
2.5
2.5
mV
4
4
I
L
= 1 mA
5
9
9
12
12
I
L
= 50 mA
100
125
125
180
180
I
L
= 150 mA
260
325
325
470
470
I
L
= 250 mA
450
575
575
850
850
I
GND
Ground Pin Current
I
L
= 0
65
95
95
A
125
125
I
L
= 1 mA
75
110
110
170
170
I
L
= 50 mA
350
600
600
1000
1000
I
L
= 150 mA
850
1500
1500
2500
2500
I
L
= 250 mA
1500
2300
2300
4000
4000
V
ON/OFF
<
0.3V
0.01
0.8
0.8
V
ON/OFF
<
0.15V
0.05
2
2
V
ON/OFF
ON/OFF Input Voltage
(Note 8)
High = O/P ON
1.4
1.6
1.6
V
Low = O/P OFF
0.55
0.15
0.15
LP2992
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4
Electrical Characteristics
(Continued)
Limits in standard typeface are for T
J
= 25C. and limits in boldface type apply over the full operating temperature range. Un-
less otherwise specified: V
IN
= V
O
(NOM) + 1V, I
L
= 1 mA, C
IN
= 1 F, C
OUT
= 4.7 F, V
ON/OFF
= 2V.
Symbol
Parameter
Conditions
Typ
LP2992AI-X.X
LP2992I-X.X
Units
(Note 6)
(Note 6)
Min
Max
Min
Max
I
ON/OFF
ON/OFF Input Current
V
ON/OFF
= 0
0.01
-2
-2
A
V
ON/OFF
= 5V
5
15
15
e
n
Output Noise
BW = 300 Hz to 50 kHz,
Voltage (RMS)
C
OUT
= 10 F
30
V
C
BYPASS
= 10 nF
Ripple Rejection
f = 1 kHz, C
BYPASS
= 10 nF
45
dB
C
OUT
= 10 F
I
O
(SC)
Short Circuit Current
R
L
= 0 (Steady State)
400
mA
(Note 9)
I
O
(PK)
Peak Output Current
V
OUT
V
o
(NOM) -5%
350
mA
Note 1: "Absolute Maximum Ratings" indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the
device outside of its rated operating conditions.
Note 2: The ESD rating of pins 3 and 4 for the SOT-23 package, or pins 1 and 3 for the LLP package, is 1 kV.
Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, T
J
(MAX), the junction-to-ambient thermal resistance,
J-A
,
and the ambient temperature, T
A
. The maximum allowable power dissipation at any ambient temperture is calculated using:
Where the value of
J-A
for the SOT-23 package is 220C/W in a typical PC board mounting and the LLP package is 65C/W. Exceeding the maximum allowable
dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown.
Note 4: If used in a dual-supply system where the regulator load is returned to a negative supply, the LP2992 output must be diode-clamped to ground.
Note 5: The output PNP structure contains a diode between the V
IN
to V
OUT
terminals that is normally reverse-biased. Reversing the polarity from V
IN
to V
OUT
will
turn on this diode.
Note 6: Limits are 100% production tested at 25C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control
(SQC) methods. The limits are used to calculate National's Average Outgoing Quality Level (AOQL).
Note 7: V
IN
must be the greater of 2.2V or V
OUT(nom)
+ Dropout Voltage to maintain output regulation. Dropout voltage is defined as the input to output differential
at which the output voltage drops 2% below the value measured with a 1V differential.
Note 8: The ON/OFF input must be properly driven to prevent possible misoperation. For details, refer to Application Hints.
Note 9: The LP2992 has foldback current limiting which allows a high peak current when V
OUT
>
0.5V, and then reduces the maximum output current as V
OUT
is
forced to ground (see Typical Performance Characteristics curves).
LP2992
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5
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