LP3995
Micropower 150mA CMOS Voltage Regulator with Active
Shutdown
LP3995 Micropower 150mA CMOS Voltage Regulator with Active Shutdown
General Description
The LP3995 linear regulator is designed to meet the requirements of portable battery-powered applications and will provide an accurate output voltage with low noise and low
quiescent current. Ideally suited for powering RF/Analog
devices, this device will also be used to meet more general
circuit needs in which a fast turn-off is essential.
For battery powered applications the low dropout and low
ground current provided by the device allows the lifetime of
the battery to be maximized. The Enable(/Disable) control
allows the system to further extend the battery lifetime by
reducing the power consumption to virtually zero.
The Enable(/Disable) function on the device incorporates an
active discharge circuit on the output for faster device shutdown. Where the fast turn-off is not required the LP3999
linear regulator is recommended.
The LP3995 also features internal protection against shortcircuit currents and over-temperature conditions.
The LP3995 is designed to be stable with small 1.0 µF
ceramic capacitors. The small outline of the LP3995 micro
SMD package with the required ceramic capacitors can
realize a system application within minimal board area.
Performance is specified for a −40˚C to +125˚C temperature
range.
The device is available in micro SMD package and LLP
package. For other package options contact your local NSC
sales office.
The device is available in fixed output voltages in the ranges
1.5V to 3.3V. For availability, please contact your local NSC
sales office.
Key Specifications
n 2.5V to 6.0V Input Range
n Accurate Output Voltage;
n 60 mV Typical Dropout with 150 mA Load
n Virtually Zero Quiescent Current when Disabled
n Low Output Voltage Noise
n Stable witha1µFOutput Capacitor
n Guaranteed 150 mA Output Current
n Fast Turn-on; 30 µs (Typ.)
n Fast Turn-off; 175 µs (Typ.)
±
75mV / 2%
Features
n 5 pin micro SMD Package
n 6 pin LLP Package
n Stable with Ceramic Capacitor
n Logic Controlled Enable
n Fast Turn-on
n Active Disable for Fast Turn-off.
n Thermal-overload and Short-circuit Protection
n −40 to +125˚C Junction Temperature Range for
Operation
Applications
n GSM Portable Phones
n CDMA Cellular Handsets
n Wideband CDMA Cellular Handsets
n Bluetooth Devices
n Portable Information Appliances
5N/CNo internal connection. There should not be any board connection to this pin.
PadGNDGround connection.
20034902
Enable Input; Disables the Regulator when ≤ 0.4V.
Enables the regulator when ≥ 0.9V
Voltage output. Connect this output to the load circuit.
Voltage Supply Input
Bypass Capacitor connection.
Connect a 0.01 µF capacitor for noise reduction.
Connect to ground plane for best thermal conduction.
Connection Diagrams
micro SMD, 5 Bump Package
Top View
See NS Package Number TLA05
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20034903
Connection Diagrams (Continued)
LLP- 6 Package (SOT23 Footprint)
LP3995
Top View
See NS Package Number LDE06A
20034904
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Ordering Information
LP3995
Output Voltage
(V)
1.5STDLP3995ITL-1.5LP3995ITLX-1.5
1.6STDLP3995ITL-1.6LP3995ITLX-1.6
1.8STDLP3995ITL-1.8LP3995ITLX-1.8
1.9STDLP3995ITL-1.9LP3995ITLX-1.9
2.1STDLP3995ITL-2.1LP3995ITLX-2.1
2.5STDLP3995ITL-2.5LP3995ITLX-2.5
2.8STDLP3995ITL-2.8LP3995ITLX-2.8
2.85STDLP3995ITL-2.85LP3995ITLX-2.85
3.0STDLP3995ITL-3.0LP3995ITLX-3.0
Output Voltage
(V)
1.5 (Note 2)STDLP3995ITL-1.5LP3995ITLX-1.5
1.6 (Note 2)STDLP3995ITL-1.6LP3995ITLX-1.6
1.8 (Note 2)STDLP3995ITL-1.8LP3995ITLX-1.8
1.9 (Note 2)STDLP3995ITL-1.9LP3995ITLX-1.9
2.1 (Note 2)STDLP3995ITL-2.1LP3995ITLX-2.1
2.5 (Note 2)STDLP3995ITL-2.5LP3995ITLX-2.5
2.8 (Note 2)STDLP3995ITL-2.8LP3995ITLX-2.8
3.0 (Note 2)STDLP3995ITL-3.0LP3995ITLX-3.0
For micro SMD Package
GradeLP3995 Supplied as 250
Units, Tape and Reel
For micro SMD Package unleaded
GradeLP3995 Supplied as 250
Units, Tape and Reel
LP3995 Supplied as
3000 Units, Tape and
Reel
LP3995 Supplied as
3000 Units, Tape and
Reel
Package
Marking
Package
Marking
For LLP- 6 Package
Output Voltage
(V)
1.5STDLP3995ILD-1.5LP3995ILDX-1.5LO20B
1.6STDLP3995ILD-1.6LP3995ILDX-1.6LO21B
1.8STDLP3995ILD-1.8LP3995ILDX-1.8LO22B
1.9 (Note 2)STDLP3995ILD-1.9LP3995ILDX-1.9LO23B
2.1 (Note 2)STDLP3995ILD-2.1LP3995ILDX-2.1LO24B
2.5 (Note 2)STDLP3995ILD-2.5LP3995ILDX-2.5LO25B
2.8STDLP3995ILD-2.8LP3995ILDX-2.8LO26B
3.0STDLP3995ILD-3.0LP3995ILDX-3.0LO30B
3.3 (Note 2)STDLP3995ILD-3.3LP3995ILDX-3.3LO31B
Note 1: Available in sample quantities only
Note 2: For availability contact your local sales office
GradeLP3995 Supplied as 1000
Units, Tape and Reel
LP3995 Supplied as
4500 Units, Tape and
Reel
Package
Marking
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LP3995
Absolute Maximum Ratings
(Notes 3, 4)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Input Voltage (V
Output Voltage−0.3 to (V
Enable Input Voltage−0.3 to 6.5V
Junction Temperature150˚C
Lead/Pad Temperature
(Note 5)
micro SMD260˚C
)−0.3 to 6.5V
IN
+ 0.3V)
IN
to 6.5V (max)
Operating Ratings (Note 3)
Input Voltage (V
Enable Input Voltage0 to 6.0V
Junction Temperature−40 to +125˚C
Ambient Temperature
Range(Note 7)
IN
Thermal Properties(Note 8)
Junction to Ambient Thermal
Resistance
θ
(LLP pkg.)88˚C/W
JA
θ
(micro SMD pkg.)255˚C/W
JA
LLP235˚C
Storage Temperature−65 to +150˚C
Continuous Power
Internally Limited
Dissipation(Note 7)
ESD (Note 9)
Human Body Model2 kV
Machine Model200V
Electrical Characteristics
Unless otherwise noted, VEN= 1.5, VIN=V
and limits appearing in normal type apply for T
range for operation, −40 to +125˚C. (Notes 14, 15)
SymbolParameterConditionsTypical
V
IN
DEVICE OUTPUT: 1.5 ≤ V
∆V
OUT
Input Voltage2.56.0V
<
1.8V
OUT
Output Voltage ToleranceI
Line Regulation ErrorV
micro SMD
Load Regulation Error
LLP
Load Regulation Error
PSRRPower Supply Rejection Ratio
(Note 11)
DEVICE OUTPUT: 1.8 ≤ V
∆V
OUT
Output Voltage ToleranceI
OUT
<
2.5V
microSMDLine Regulation Error V
LLP
Line Regulation Error
micro SMD
Load Regulation Error
LLP
Load Regulation Error
PSRRPower Supply Rejection Ratio
(Note 11)
+ 1.0V, CIN= 1 µF, I
OUT
= 25˚C. Limits appearing in boldface type apply over the full temperature
J
= 1 mA-5050
OUT
=(V
IN
OUT(NOM)
=1mA
I
OUT
I
=1mAto150mA
OUT
=1mAto150mA
I
OUT
f = 1 kHz, I
f = 10 kHz, I
= 1 mA-5050
OUT
=(V
IN
=1mA
I
OUT
V
=(V
IN
=1mA
I
OUT
I
=1mAto150mA
OUT
I
=1mAto150mA
OUT
f = 1 kHz, I
f = 10 kHz, I
=1mA55
OUT
=1mA53
OUT
OUT(NOM)
OUT(NOM)
=1mA55
OUT
=1mA50
OUT
= 1 mA, C
OUT
+1.0V) to 6.0V,
+1.0V) to 6.0V,
+1.0V) to 6.0V,
OUT
)2.5 to 6.0V
-40 to 85˚C
= 1 µF, cBP= 0.01 µF. Typical values
Limit
MinMax
-7575
Units
mV
-3.53.5mV/V
1075
70125
µV/mA
µV/mA
dB
−7575
mV
−2.52.5mV/V
−3.53.5mV/V
1075
80125
µV/mA
µV/mA
dB
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