LP2983
Micropower 150 mA Voltage Regulator in SOT-23
Package For Output Voltages
1.2V
Designed for Use with Very Low ESR Output Capacitors
General Description
The LP2983 is a 150 mA, fixed-output voltage regulator
designed to provide tight voltage regulation in applications
with output voltages
1.2V.
Using an optimized VIP
TM
(Vertically Integrated PNP) pro-
cess, the LP2983 delivers unequalled performance in all
critical specifications:
Ground Pin Current: Typically 825 A
@
150 mA load, and
75 A
@
1 mA load.
Enhanced Stability: The LP2983 is stable with output ca-
pacitor ESR down to zero, which allows the use of ceramic
capacitors on the output.
Smallest Possible Size: SOT-23 package uses absolute
minimum board space.
Precision Output: 1% tolerance output voltages available
(A grade).
Features
n
Guaranteed 150 mA output current
n
Smallest possible size (SOT-23 package)
n
Requires minimum external components
n
Stable with low-ESR output capacitor
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
Applications
n
Cellular Phone
n
Palmtop/Laptop Computer
n
Personal Digital Assistant (PDA)
n
Camcorder, Personal Stereo, Camera
Block Diagram
20029101
VIP
TM
is a trademark of National Semiconductor Corporation.
October 2001
LP2983
Micropower
150
mA
V
oltage
Regulator
in
SOT
-23
Package
For
Output
V
oltages
1.2V
2001 National Semiconductor Corporation
DS200291
www.national.com
Basic Application Circuit
20029102
*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).
Connection Diagram
5-Lead Small Outline Package (M5)
20029103
Top View
See NS Package Number MF05A
For ordering information see
Table 1
LP2983
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2
Ordering Information
TABLE 1. Package Marking and Ordering Information
Output Voltage
(V)
Grade
Order Information
Package
Marking
Supplied as:
0.9
A
LP2983AIM5X-0.9
LEJA
3000 Units on Tape and Reel
0.9
A
LP2983AIM5-0.9
LEJA
1000 Units on Tape and Reel
0.9
STD
LP2983IM5X-0.9
LEJB
3000 Units on Tape and Reel
0.9
STD
LP2983IM5-0.9
LEJB
1000 Units on Tape and Reel
1.0
A
LP2983AIM5X-1.0
LENA
3000 Units on Tape and Reel
1.0
A
LP2983AIM5-1.0
LENA
1000 Units on Tape and Reel
1.0
STD
LP2983IM5X-1.0
LENB
3000 Units on Tape and Reel
1.0
STD
LP2983IM5-1.0
LENB
1000 Units on Tape and Reel
1.2
A
LP2983AIM5X-1.2
LELA
3000 Units on Tape and Reel
1.2
A
LP2983AIM5-1.2
LELA
1000 Units on Tape and Reel
1.2
STD
LP2983IM5X-1.2
LELB
3000 Units on Tape and Reel
1.2
STD
LP2983IM5-1.2
LELB
1000 Units on Tape and Reel
LP2983
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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,(Note 5)
-0.3V to +16V
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
= 2.2 F, V
ON/OFF
= 2V.
Symbol
Parameter
Conditions
Typ
LP2983AI-X.X
LP2983I-X.X
Units
(Note 6)
(Note 6)
Min
Max
Min
Max
V
O
Output Voltage
Tolerance
-1.0
1.0
-1.5
1.5
%
1 mA
I
L
50 mA
-2.0
2.0
-2.5
2.5
-2.5
2.5
-3.5
3.5
1 mA
I
L
150 mA
-2.5
2.5
-3.0
3.0
-3.5
3.5
-4.0
4.0
Output Voltage
V
O
(NOM)+1V
V
IN
16V
0.01
0.016
0.016
%/V
Line Regulation
0.032
0.032
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
= 10 mA
120
220
220
400
400
I
L
= 50 mA
300
500
500
900
900
I
L
= 150 mA
825
1200
1500
2000
2000
V
ON/OFF
<
0.15V
6
12
12
V
ON/OFF
<
0.05V
0.2
2
2
V
IN
(min)
Minimum V
IN
required
to maintain Output
Regulation
2.05
2.20
2.20
V
V
ON/OFF
ON/OFF Input Voltage
(Note 7)
High = O/P ON
1.4
1.6
1.6
Low = O/P OFF
0.1
0.05
0.05
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 = 10 Hz to 100 kHz,
Voltage (RMS)
C
OUT
= 10 F
60
V
V
OUT
= 1.2V
Ripple Rejection
f = 1 kHz
65
dB
C
OUT
= 2.2 F
I
O
(SC)
Short Circuit Current
R
L
= 0 (Steady State)
400
mA
(Note 8)
I
O
(PK)
Peak Output Current
V
OUT
V
o
(NOM) -5%
250
LP2983
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4
Electrical Characteristics
(Continued)
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 pin 3 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 240C/W in a typical PC board mounting. 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 LP2983 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 and possibly cause a destructive latch-up condition (see Application Hints).
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: The ON/OFF input must be properly driven to prevent possible misoperation. For details, refer to Application Hints.
Note 8: The LP2983 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 down to ground (see Typical Performance Characteristics curves).
LP2983
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