NSC LP3981IMMX-3.3, LP3981IMMX-3.03, LP3981ILD-3.3, LP3981ILD-3.03, LP3981ILD-2.5 Datasheet
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March 2003
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
n2.5 to 6.0V input range
n300mA guaranteed output
n60dB PSRR at 1kHz
n≤1µA quiescent current when shut down
nFast Turn-On time: 120 µs (typ.) with CBYPASS = 0.01uF
n132mV typ dropout with 300mA load
n35µVrms output noise over 10Hz to 100kHz
n−40 to +125˚C junction temperature range for operation
n2.5V, 2.7V, 2.8V, 2.83V, 3.0V, 3.03V, and 3.3V outputs standard
Features
nSmall, space saving MSOP-8
nLow Thermal Resistance in LLP-6 package gives excellent power capability
nLogic controlled enable
nStable with ceramic and high quality tantalum capacitors
nFast turn-on
nThermal shutdown and short-circuit current limit
Applications
nCDMA cellular handsets
nWideband CDMA cellular handsets
nGSM cellular handsets
nPortable information appliances
nTiny 3.3V ± 5% to 2.5V, 300mA converter
Typical Application Circuit
20020302
Note: Pin Numbers in parenthesis indicate LLP-6 package.
Regulator Voltage CMOS Dropout-Low Ultra 300mA Micropower, LP3981
© 2003 National Semiconductor Corporation |
DS200203 |
www.national.com |
LP3981
Block Diagram
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20020301 |
Pin Descriptions |
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Name |
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MSOP-8 |
LLP-6 |
Function |
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VEN |
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7 |
6 |
Enable Input Logic, Enable High |
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GND |
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5 |
4 |
Common Ground |
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VOUT |
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1 |
1 |
Output Voltage of the LDO |
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VIN |
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2 |
2 |
Input Voltage of the LDO |
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Bypass |
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6 |
5 |
Optional bypass capacitor for noise |
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reduction |
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VOUT-SENSE |
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4 |
3 |
Output. Voltage Sense Pin. Should |
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be connected to VOUT for proper |
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operation. |
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N.C |
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3, 8 |
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Connection Diagrams |
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LLP-6 Package |
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MSOP-8 Package |
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20020370
20020307 |
Top View |
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See NS Package Number LDC06D |
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Top View |
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See NS Package Number MUA008AE |
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www.national.com |
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Ordering Information
For LLP-6 Package
Output |
Grade |
LP3981 Supplied as 1000 |
LP3981 Supplied as 4500 |
Package Marking |
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Voltage (V) |
Units, Tape and Reel |
Units, Tape and Reel |
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2.5 |
STD |
LP3981ILD-2.5 |
LP3981ILDX-2.5 |
LO1UB |
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2.7 |
STD |
LP3981ILD-2.7 |
LP3981ILDX-2.7 |
LO1VB |
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2.8 |
STD |
LP3981ILD-2.8 |
LP3981ILDX-2.8 |
LO1ZB |
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2.83 |
STD |
LP3981ILD-2.83 |
LP3981ILDX-2.83 |
L01SB |
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3.0 |
STD |
LP3981ILD-3.0 |
LP3981ILDX-3.0 |
L017B |
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3.03 |
STD |
LP3981ILD-3.03 |
LP3981ILDX-3.03 |
LO1YB |
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3.3 |
STD |
LP3981ILD -3.3 |
LP3981ILDX-3.3 |
LO1XB |
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For MSOP-8 Package
Output |
Grade |
LP3981 Supplied as 1000 |
LP3981 Supplied as 3500 |
Package Marking |
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Voltage (V) |
Units, Tape and Reel |
Units, Tape and Reel |
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2.5 |
STD |
LP3981IMM-2.5 |
LP3981IMMX-2.5 |
LFKB |
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2.7 |
STD |
LP3981IMM-2.7 |
LP3981IMMX-2.7 |
LFLB |
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2.8 |
STD |
LP3981IMM-2.8 |
LP3981IMMX-2.8 |
LFTB |
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2.83 |
STD |
LP3981IMM-2.83 |
LP3981IMMX-2.83 |
LDUB |
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3.0 |
STD |
LP3981IMM-3.0 |
LP3981IMMX-3.0 |
LF3B |
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3.03 |
STD |
LP3981IMM-3.03 |
LP3981IMMX-3.03 |
LFPB |
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3.3 |
STD |
LP3981IMM-3.3 |
LP3981IMMX-3.3 |
LFNB |
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*Please contact factory regarding the availability of voltage options not listed here.
LP3981
3 |
www.national.com |
LP3981
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.
VIN, VEN |
−0.3 to 6.5V |
VOUT, VOUT-SENSE |
−0.3 to VIN + 0.3, |
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Max 6.5V |
Junction Temperature |
150˚C |
Storage Temperature |
−65˚C to +150˚C |
Lead Temp. |
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Pad Temp. |
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Power Dissipation (Note 3) |
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θJA (MSOP-8) |
210˚C/W |
θJA (LLP-6) |
50˚C/W |
Maximum Power Dissipation at 25˚C |
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MSOP-8 |
595mW |
LLP-6 |
2.5W |
ESD Rating(Note 4) |
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Human Body Model |
2kV |
Machine Model |
200V |
Operating Ratings (Notes 1, 2)
VIN |
2.7 to 6V |
VEN |
0 to VIN |
Junction Temperature |
−40˚C to +125˚C |
Maximum Power Dissipation (Note 5) |
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MSOP-8 |
476mW |
LLP-6 |
2.0W |
Electrical Characteristics
Unless otherwise specified: VEN = 1.2V, VIN = VOUT + 0.5V, CIN = 2.2 µF, CBP = 0.033 µF, IOUT = 1mA, COUT = 2.2 µF. Typical values and imits appearing in standard typeface are for TJ = 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 |
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Limit |
Units |
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Min |
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Max |
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Output Voltage |
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−2 |
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2 |
% of |
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Tolerance |
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−3 |
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3 |
VOUT(nom) |
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VIN = VOUT + 0.5V to 6.0V, TA < |
0.005 |
−0.1 |
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0.1 |
%/V |
∆VOUT |
Line Regulation Error |
+85˚C |
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VIN = VOUT + 0.5V to 6.0V, TJ ≤125˚C |
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−0.2 |
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0.2 |
%/V |
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Load Regulation Error |
IOUT = 1 mA to 300 mA |
0.0003 |
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0.005 |
%/mA |
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(Note 8) |
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VIN = VOUT(nom) + 1V, |
50 |
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f = 1 kHz, |
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PSRR |
Power Supply Rejection Ratio |
IOUT = 50 mA (Figure 2) |
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dB |
(Note 10) |
VIN = VOUT(nom) + 1V, |
55 |
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f = 10 kHz, |
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IOUT = 50 mA (Figure 2) |
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IQ |
Quiescent Current |
VEN = 1.2V, IOUT = 1 mA |
70 |
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120 |
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VEN = 1.2V, IOUT = 1 to 300 mA, |
170 |
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210 |
µA |
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VOUT = 2.5V(Note 12) |
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VEN = 0.4V |
0.003 |
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1.5 |
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IOUT = 1 mA |
0.5 |
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5 |
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Dropout Voltage (Note 9) |
IOUT = 200 mA |
88 |
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133 |
mV |
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IOUT = 300 mA |
132 |
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200 |
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ISC |
Short Circuit Current Limit |
Output Grounded |
600 |
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mA |
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(Steady State) |
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en |
Output Noise Voltage |
BW = 10 Hz to 100 kHz, |
35 |
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µVrms |
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CBP = 0.033µF |
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TSD |
Thermal Shutdown Temperature |
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160 |
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˚C |
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Thermal Shutdown Hysteresis |
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20 |
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˚C |
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IOUT(PK) |
Peak Output Current |
VOUT ≥ VOUT (nom) - 5% |
455 |
300 |
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IEN |
Maximum Input Current at VEN |
VEN = 0 and VIN |
0.001 |
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µA |
VIL |
Logic Low Input threshold |
VIN = 2.7 to 6.0V |
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0.4 |
V |
VIH |
Logic High Input threshold |
VIN = 2.7 to 6.0V |
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1.4 |
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V |
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4 |
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