LP2980-ADJ
Micropower SOT, 50 mA Ultra Low-Dropout Adjustable
Voltage Regulator
General Description
The LP2980-ADJ is a 50 mA adjustable voltage regulator de-
signed to provide ultra low dropout in battery powered appli-
cations.
Using an optimized VIP
TM
(vertically Integrated PNP) pro-
cess, the LP2980-ADJ delivers unequalled performance in
all specifications critical to battery-powered designs:
Adjustable Output: output voltage can be set from 1.23V to
15V.
Precision Reference: 0.75% tolerance.
Dropout Voltage: typically 120 mV
@
50 mA load, and 7 mV
@
1 mA load.
Ground Pin Current: typically 320 A
@
50 mA load, and 80
A
@
1 mA load.
Sleep Mode: less than 1 A quiescent current when on/off
pin is pulled low.
Smallest Possible Size: SOT-23 package uses minimum
board space.
Features
n
Ultra low dropout voltage
n
Output adjusts from 1.23V to 15V
n
Guaranteed 50 mA output current
n
Uses tiny SOT-23 package
n
Requires few external components
n
<
1 A quiescent current when shutdown
n
Low ground pin current at all loads
n
High peak current capability (150 mA typical)
n
Wide supply voltage range (2.5V16V)
n
Overtemperature/overcurrent protection
n
-40C to +125C Junction temperature range
Applications
n
Cellular Phone
n
Palmtop/Laptop Computer
n
Camcorder, Personal Stereo, Camera
Block Diagram
Connection Diagram
VIP
TM
is a trademark of National Semiconductor Corporation.
DS100001-1
5-Lead Small Outline Package (M5)
DS100001-2
Top View
See NS Package Number MA05B
For ordering Information, refer to
Table 1 in this
document
April 2000
LP2980-ADJ
Micropower
SOT
,
5
0
m
A
Ultra
Low-Dropout
Adjustable
V
oltage
Regulator
2000 National Semiconductor Corporation
DS100001
www.national.com
Basic Application Circuit
Ordering Information
TABLE 1. Package Marking and Ordering Information
Grade
Order Information
Package Marking
Supplied as
STD
LP2980IM5X-ADJ
L06B
3k Units on Tape and Reel
STD
LP2980IM5-ADJ
L06B
250 Units on Tape and Reel
For fixed output voltage versions, see LP2980 and LP2980LV datasheets.
DS100001-3
*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 OVER
FULL LOAD CURRENT RANGE (SEE APPLICATION HINTS).
LP2980-ADJ
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2
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
-65 to +150C
Operating Junction Temperature
Range
-40 to +125C
Lead Temp. (Soldering, 5 seconds)
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)
2.5V to +16V
Shutdown Input Voltage (Survival)
-0.3V to +16V
Output Voltage (Survival) (Note 4)
-0.3V to 16V
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.
Unless otherwise specified: V
IN
= 4.3V, V
OUT
= 3.3V, I
L
= 1 mA, C
IN
= 1 F, C
OUT
= 2.2 F, V
ON/OFF
= 2V.
Symbol
Parameter
Conditions
Typ
LP2980I-ADJ (Note
6)
Units
Min
Max
V
REF
Reference Voltage
1.225
1.213
1.237
V
1 mA
<
I
L
<
50 mA
V
OUT
+ 1
V
IN
16V
1.225
1.206
1.182
1.243
1.268
Reference Voltage Line
Regulation
2.5V
V
IN
16V
3
6.0
15.0
mV
V
IN
V
O
Dropout Voltage (Note 7)
I
L
= 0
1
3
5
mV
I
L
= 1 mA
7
10
15
I
L
= 10 mA
40
60
90
I
L
= 50 mA
120
150
225
I
GND
Ground Pin Current
I
L
= 0
60
95
125
A
I
L
= 1 mA
80
110
170
I
L
= 10 mA
120
220
460
I
L
= 50 mA
320
600
1200
V
ON/OFF
<
0.18V
0.01
1
I
ADJ
ADJ Pin Bias Current
1 mA
I
L
50 mA
150
350
nA
V
ON/OFF
ON/OFF Input Voltage
(Note 8)
High = O/P ON
1.4
1.6
V
Low = O/P OFF
0.55
0.18
I
ON/OFF
ON/OFF Input Current
V
ON/OFF
= 0
0.01
-1
A
V
ON/OFF
= 5V
5
15
I
O
(PK)
Peak Output Current
V
OUT
V
O
(NOM) - 5%
150
100
mA
e
n
Output Noise Voltage
(RMS)
BW = 300 Hz to 50 kHz,
C
OUT
= 10 F
160
V
Ripple Rejection
f = 1 kHz
C
OUT
= 10 F
68
dB
I
O
(MAX)
Short Circuit Current
R
L
= 0 (Steady State)
(Note 9)
150
mA
LP2980-ADJ
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3
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 de-
vice outside of its rated operating conditions.
Note 2: The ESD rating of pins 3 and 4 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 temperature is calculated using:
The value of
J-A
for the SOT-23 package is 300C/W. Exceeding the maximum allowable power 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 LP2980-ADJ output must be diode-clamped to ground.
Note 5: The output PNP structure contains a diode between the V
IN
and V
OUT
terminals that is normally reverse-biased. Reversing the polarity from V
IN
to V
OUT
will turn on this diode (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: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV 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: See Typical Performance Characteristics curves.
Typical Performance Characteristics
Unless otherwise specified: T
A
= 25C, V
IN
= V
O
(NOM) + 1V,
I
L
= 1 mA, ON/OFF pin tied to V
IN
, R
ADJ
= 86.6k, and test circuit is as shown in Basic Application Circuit.
Output Voltage vs. Temperature
DS100001-5
Dropout Characteristics
DS100001-6
Dropout Voltage vs. Temperature
DS100001-7
Dropout Voltage vs. Load Current
DS100001-8
LP2980-ADJ
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4
Typical Performance Characteristics
Unless otherwise specified: T
A
= 25C, V
IN
= V
O
(NOM) + 1V,
I
L
= 1 mA, ON/OFF pin tied to V
IN
, R
ADJ
= 86.6k, and test circuit is as shown in Basic Application Circuit. (Continued)
Ground Pin Current vs. Temperature
DS100001-9
Ground Pin Current vs. Load Current
DS100001-10
Input Current vs. V
IN
DS100001-11
Load Transient Response
DS100001-12
Line Transient Response
DS100001-13
Short Circuit Current
DS100001-14
LP2980-ADJ
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