NSC LP3981IMMX-3.3, LP3981IMMX-3.03, LP3981ILD-3.3, LP3981ILD-3.03, LP3981ILD-2.5 Datasheet
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LP3981
Micropower, 300mA Ultra Low-Dropout CMOS Voltage
Regulator
General Description
The LP3981’s performance is optimized for battery powered
systems to deliver ultra low noise, extremely low dropout
voltage and low quiescent current. Regulator ground current
increases only slightly in dropout, further prolonging the
battery life.
Power supply rejection is better than 60 dB at low frequencies. This high power supply rejection is maintained down to
lower input voltage levels common to battery operated circuits.
The device is ideal for mobile phone and similar battery
powered wireless applications. It provides up to 300 mA,
from a 2.5V to 6V input, consuming less than 1µA in disable
mode.
The LP3981 is available in MSOP-8 package. For LP3981 in
LLP-6 package, contact NSC sales offices. Performance is
specified for −40˚C to +125˚C temperature range. The device available in the following output voltages; 2.5V, 2.7V,
2.8V, 2.83V, 3.0V, 3.03V and 3.3V as standard. Other output
options can be made available, please contact your local
NSC sales office.
Key Specifications
n 2.5 to 6.0V input range
n 300mA guaranteed output
n 60dB PSRR at 1kHz
n ≤1µA quiescent current when shut down
n Fast Turn-On time: 120 µs (typ.) with C
BYPASS
= 0.01uF
n 132mV typ dropout with 300mA load
n 35µVrms output noise over 10Hz to 100kHz
n −40 to +125˚C junction temperature range for operation
n 2.5V, 2.7V, 2.8V, 2.83V, 3.0V, 3.03V, and 3.3V outputs
standard
Features
n Small, space saving MSOP-8
n Low Thermal Resistance in LLP-6 package gives
excellent power capability
n Logic controlled enable
n Stable with ceramic and high quality tantalum capacitors
n Fast turn-on
n Thermal shutdown and short-circuit current limit
Applications
n CDMA cellular handsets
n Wideband CDMA cellular handsets
n GSM cellular handsets
n Portable information appliances
n Tiny 3.3V
±
5% to 2.5V, 300mA converter
Typical Application Circuit
20020302
Note: Pin Numbers in parenthesis indicate LLP-6 package.
March 2003
LP3981 Micropower, 300mA Ultra Low-Dropout CMOS Voltage Regulator
© 2003 National Semiconductor Corporation DS200203 www.national.com
Block Diagram
20020301
Pin Descriptions
Name MSOP-8 LLP-6 Function
V
EN
7 6 Enable Input Logic, Enable High
GND 5 4 Common Ground
V
OUT
1 1 Output Voltage of the LDO
V
IN
2 2 Input Voltage of the LDO
Bypass 6 5 Optional bypass capacitor for noise
reduction
V
OUT-SENSE
4 3 Output. Voltage Sense Pin. Should
be connected to V
OUT
for proper
operation.
N.C 3, 8
Connection Diagrams
MSOP-8 Package
20020307
Top View
See NS Package Number MUA008AE
LLP-6 Package
20020370
Top View
See NS Package Number LDC06D
LP3981
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Ordering Information
For LLP-6 Package
Output
Voltage (V)
Grade
LP3981 Supplied as 1000
Units, Tape and Reel
LP3981 Supplied as 4500
Units, Tape and Reel
Package Marking
2.5 STD LP3981ILD-2.5 LP3981ILDX-2.5 LO1UB
2.7 STD LP3981ILD-2.7 LP3981ILDX-2.7 LO1VB
2.8 STD LP3981ILD-2.8 LP3981ILDX-2.8 LO1ZB
2.83 STD LP3981ILD-2.83 LP3981ILDX-2.83 L01SB
3.0 STD LP3981ILD-3.0 LP3981ILDX-3.0 L017B
3.03 STD LP3981ILD-3.03 LP3981ILDX-3.03 LO1YB
3.3 STD LP3981ILD -3.3 LP3981ILDX-3.3 LO1XB
For MSOP-8 Package
Output
Voltage (V)
Grade
LP3981 Supplied as 1000
Units, Tape and Reel
LP3981 Supplied as 3500
Units, Tape and Reel
Package Marking
2.5 STD LP3981IMM-2.5 LP3981IMMX-2.5 LFKB
2.7 STD LP3981IMM-2.7 LP3981IMMX-2.7 LFLB
2.8 STD LP3981IMM-2.8 LP3981IMMX-2.8 LFTB
2.83 STD LP3981IMM-2.83 LP3981IMMX-2.83 LDUB
3.0 STD LP3981IMM-3.0 LP3981IMMX-3.0 LF3B
3.03 STD LP3981IMM-3.03 LP3981IMMX-3.03 LFPB
3.3 STD LP3981IMM-3.3 LP3981IMMX-3.3 LFNB
*
Please contact factory regarding the availability of voltage options not listed here.
LP3981
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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,VEN
−0.3 to 6.5V
V
OUT,VOUT-SENSE
−0.3 to VIN+ 0.3,
Max 6.5V
Junction Temperature 150˚C
Storage Temperature −65˚C to +150˚C
Lead Temp.
Pad Temp.
Power Dissipation (Note 3)
θ
JA
(MSOP-8)
θ
JA
(LLP-6)
210˚C/W
50˚C/W
Maximum Power Dissipation at 25˚C
MSOP-8
LLP-6
595mW
2.5W
ESD Rating(Note 4)
Human Body Model
Machine Model
2kV
200V
Operating Ratings (Notes 1, 2)
V
IN
2.7 to 6V
V
EN
0toV
IN
Junction Temperature −40˚C to +125˚C
Maximum Power Dissipation (Note 5)
MSOP-8
LLP-6
476mW
2.0W
Electrical Characteristics
Unless otherwise specified: VEN= 1.2V, VIN=V
OUT
+ 0.5V, CIN= 2.2 µF, CBP= 0.033 µF, I
OUT
= 1mA, C
OUT
= 2.2 µF. Typi-
cal values and imits appearing in standard typeface are for T
J
= 25˚C. Limits appearing in boldface type apply over the entire
junction temperature range for operation, −40˚C to +125˚C. (Notes 6, 7)
Symbol Parameter Conditions Typ
Limit
Units
Min Max
∆V
OUT
Output Voltage
Tolerance
−2
−3
2
3
%of
V
OUT(nom)
Line Regulation Error
V
IN=VOUT
+ 0.5V to 6.0V, T
A
<
+85˚C
0.005 −0.1 0.1
%/V
V
IN=VOUT
+ 0.5V to 6.0V, TJ≤125˚C −0.2 0.2 %/V
Load Regulation Error
(Note 8)
I
OUT
= 1 mA to 300 mA 0.0003 0.005 %/mA
PSRR
Power Supply Rejection Ratio
(Note 10)
V
IN=VOUT(nom)
+ 1V,
f = 1 kHz,
I
OUT
=50mA(Figure 2)
50
dB
V
IN=VOUT(nom)
+ 1V,
f = 10 kHz,
I
OUT
=50mA(Figure 2)
55
I
Q
Quiescent Current VEN= 1.2V, I
OUT
= 1 mA 70 120
µA
V
EN
= 1.2V, I
OUT
= 1 to 300 mA,
V
OUT
= 2.5V(Note 12)
170 210
V
EN
= 0.4V 0.003 1.5
Dropout Voltage (Note 9)
I
OUT
=1mA 0.5 5
mVI
OUT
= 200 mA 88 133
I
OUT
= 300 mA 132 200
I
SC
Short Circuit Current Limit Output Grounded
(Steady State)
600
mA
e
n
Output Noise Voltage BW = 10 Hz to 100 kHz,
C
BP
= 0.033µF
35 µVrms
TSD
Thermal Shutdown Temperature 160 ˚C
Thermal Shutdown Hysteresis 20 ˚C
I
OUT(PK)
Peak Output Current V
OUT
≥ V
OUT
(nom) - 5% 455 300
I
EN
Maximum Input Current at V
EN
VEN= 0 and V
IN
0.001 µA
V
IL
Logic Low Input threshold VIN= 2.7 to 6.0V 0.4 V
V
IH
Logic High Input threshold VIN= 2.7 to 6.0V 1.4 V
LP3981
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