LP8340
Low Dropout, Low I
Q
, 1.0A CMOS Linear Regulator
General Description
The LP8340 low-dropout CMOS linear regulator is available
in 5V, 3.3V, 2.5V, 1.8V and adjustable output versions. Pack-
aged in the 6ld LLP package and 3ld DPAK. The LP8340 can
deliver up to 1.0A output current.
Typical dropout voltage is 420mV at 1.0A for the 5.0V ver-
sion, 540mV at 1.0A for the 3.3V version, 670mV at 1.0A for
the 2.5V version and 680mV at 800mA for the 1.8V version.
The LP8340 includes a zener trimmed bandgap voltage
reference, foldback current limiting and thermal overload
limiting.
The LP8340 features a PMOS output transistor which unlike
PNP type low dropout regulators requires no base drive
current. This allows the device ground current to remain less
than 50A over operating temperature, supply voltage and
irrespective of the load current.
Features
n
1.5% Typical V
OUT
tolerance
n
420mV Typical Dropout
@
1.0A (V
O
= 5V)
n
Wide Operating Range
2.7V to 10V
n
Internal 1.0A PMOS Output Transistor
n
19A Typical Quiescent Current
n
Thermal Overload Limiting
n
Foldback Current Limiting
n
Zener Trimmed Bandgap Reference
n
Space saving LLP package
n
Temperature Range
-- LP8340C
0C to 125C
-- LP8340I
-40C to 125C
Applications
n
Hard Disk Drives
n
Notebook Computers
n
Battery Powered Electronics
n
Portable Instrumentation
Typical Applications
Fixed V
OUT
20060901
Adjustable V
OUT
20060902
October 2003
LP8340
Low
Dropout,
Low
I
Q
,
1.0A
CMOS
Linear
Regulator
2003 National Semiconductor Corporation
DS200609
www.national.com
Connection Diagrams
6-Pin LLP
FIXED OUTPUT VOLTAGE
20060904
Bottom View
6-Pin LLP
ADJUSTABLE OUTPUT VOLTAGE
20060906
Bottom View
Note: V
IN
Pins (Pin 1 & 6) must be connected together externally for full 1 amp operation (500mA max per pin).
V
OUT
Sense (Pin 5) must be connected to V
OUT
(Pin 4).
T0-252
20060905
Top View
LP8340
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3
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.
V
IN
, V
OUT
, V
OUT
Sense, ADJ
-0.3V to 12V
Storage Temperature Range
-65C to 160C
Junction Temperature (T
J
)
150C
Power Dissipation
(Note 3)
ESD Rating
Human Body Model (Note 6)
2kV
Machine Model
200V
Operating Ratings
(Notes 1, 2)
Supply Voltage
2.7 to 10V
Temperature Range
LP8340C
0C to 125C
LP8340I
-40C to 125C
LP8340C Electrical Characteristics
Unless otherwise specified all limits guaranteed for V
IN
= V
O
+ 1V, C
IN
= C
OUT
= 10F, T
J
= 25C. Boldface limits apply over
the full operating temperature range of T
J
= 0C to 125C
Symbol
Parameter
Conditions
Min
(Note 5)
Typ
(Note 4)
Max
(Note 5)
Units
V
IN
Input Voltage
LP8340-ADJ,1.8, 2.5
LP8340-3.3, 5.0
2.7
10
10
V
V
OUT
Output Voltage
LP8340-ADJ, ADJ = OUT
I
OUT
= 10mA, V
IN
= 2.7V, T
J
= 25C
100A
I
OUT
800mA, 3.0V V
IN
V
OUT
+4V
800mA
<
I
OUT
1.0A, 3.2V V
IN
V
OUT
+4V
1.231
1.213
1.213
1.250
1.269
1.288
1.288
V
LP8340-1.8
I
OUT
= 10mA, V
IN
= 2.8V, T
J
= 25C
100A
I
OUT
800mA, 3.2V V
IN
6V
800mA
<
I
OUT
1.0A, 3.4V V
IN
6V
1.773
1.746
1.746
1.800
1.827
1.854
1.854
V
LP8340-2.5
I
OUT
= 10mA, V
IN
= 3.8V, T
J
= 25C
100A
I
OUT
1.0A, 3.8V V
IN
6.5V
2.463
2.425
2.500
2.538
2.575
V
LP8340-3.3
I
OUT
= 10mA, V
IN
= 4.3V T
J
= 25C
100A
I
OUT
1.0A, 4.3V V
IN
7.5V
3.250
3.201
3.300
3.350
3.399
V
LP8340-5.0
I
OUT
= 10mA, V
IN
= 6V, T
J
= 25C
100A
I
OUT
1.0A, 6V V
IN
9V
4.925
4.850
5.000
5.075
5.150
V
V
O
Load Regulation
LP8340-ADJ, ADJ=OUT
I
OUT
= 1mA to 1.0A, V
IN
= 3.2V
6
25
mV
LP8340-1.8
I
OUT
= 1mA to 1.0A, V
IN
= 3.4V
8
30
LP8340-2.5
I
OUT
= 1mA to 1.0A, V
IN
= 3.5V
15
50
LP8340-3.3
I
OUT
= 1mA to 1.0A, V
IN
= 4.3V
20
75
LP8340-5.0
I
OUT
= 1mA to 1.0A, V
IN
= 6V
25
100
V
O
Line Regulation
V
OUT
+ 0.5V
V
IN
10V, I
OUT
= 25mA
(Note 7)
4
15
mV
LP8340
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4
LP8340C Electrical Characteristics
(Continued)
Unless otherwise specified all limits guaranteed for V
IN
= V
O
+ 1V, C
IN
= C
OUT
= 10F, T
J
= 25C. Boldface limits apply over
the full operating temperature range of T
J
= 0C to 125C
Symbol
Parameter
Conditions
Min
(Note 5)
Typ
(Note 4)
Max
(Note 5)
Units
V
IN
- V
O
Dropout Voltage
(Note 7) (Note 8)
LP8340-1.8
I
OUT
= 800mA
680
1400
mV
LP8340-2.5
I
OUT
= 800mA
550
1000
LP8340-2.5
I
OUT
= 1.0A
670
1300
LP8340-3.3
LP8340-ADJ, V
OUT
= 3.3V, I
OUT
= 800mA
420
800
LP8340-3.3
LP8340-ADJ, I
OUT
= 1.0A
540
1000
LP8340-5.0
I
OUT
= 800mA
330
650
LP8340-5.0
I
OUT
= 1.0A
420
800
I
Q
Quiescent Current
V
IN
10V
19
50
A
Minimum Load Current
V
IN
- V
OUT
4V
100
A
I
LIMIT
Foldback Current Limit
V
IN
- V
OUT
>
5V
450
mA
V
IN
- V
OUT
<
4V
1600
Ripple Rejection Ratio
V
IN
(dc) = V
OUT
+ 2V
V
IN
(ac) = 1 V
P-P
@
120Hz
48
55
dB
T
SD
Thermal Shutdown
Temp.
Thermal Shutdown Hyst.
160
10
C
ADJ Input Leakage
Current
V
ADJ
= 1.5V or 0V
0.01
100
nA
V
OUT
Leakage Current
LP8340-ADJ
ADJ = OUT, V
OUT
= 2V, V
IN
= 10V
10
A
LP8340-1.8, V
OUT
= 2.5V, V
IN
= 10V
10
LP8340-2.5, V
OUT
= 3.5V, V
IN
= 10V
10
LP8340-3.3, V
OUT
= 4V, V
IN
= 10V
10
LP8340-5.0, V
OUT
= 6V, V
IN
= 10V
10
e
n
Output Noise
10Hz to 10kHz, R
L
= 1k
, C
OUT
= 10F
250
Vrms
LP8340I Electrical Characteristics
Unless otherwise specified all limits guaranteed for V
IN
= V
O
+ 1V, C
IN
= C
OUT
= 10F, T
J
= 25C. Boldface limits apply over
the full operating temperature range of T
J
= -40C to 125C
Symbol
Parameter
Conditions
Min
(Note 5)
Typ
(Note 4)
Max
(Note 5)
Units
V
IN
Input Voltage
LP8340-ADJ,1.8, 2.5
LP8340-3.3, 5.0
2.7
10
10
V
LP8340
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