National Semiconductor LP3995 Technical data

August 2004

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

Typical Application Circuit

20034901

© 2004 National Semiconductor Corporation DS200349 www.national.com

Block Diagram

LP3995

Pin Description

5 pin micro SMD and LLP - 6

Pin No. Symbol Name and Function

micro

SMD

A1 3 V

B2 2 GND Common Ground

C1 6 V

C3 1 V

A3 4 C

LLP

EN

OUT

IN

BYPASS

5 N/C No internal connection. There should not be any board connection to this pin.

Pad GND Ground 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)

1.5 STD LP3995ITL-1.5 LP3995ITLX-1.5

1.6 STD LP3995ITL-1.6 LP3995ITLX-1.6

1.8 STD LP3995ITL-1.8 LP3995ITLX-1.8

1.9 STD LP3995ITL-1.9 LP3995ITLX-1.9

2.1 STD LP3995ITL-2.1 LP3995ITLX-2.1

2.5 STD LP3995ITL-2.5 LP3995ITLX-2.5

2.8 STD LP3995ITL-2.8 LP3995ITLX-2.8

2.85 STD LP3995ITL-2.85 LP3995ITLX-2.85

3.0 STD LP3995ITL-3.0 LP3995ITLX-3.0

Output Voltage

(V)

1.5 (Note 2) STD LP3995ITL-1.5 LP3995ITLX-1.5

1.6 (Note 2) STD LP3995ITL-1.6 LP3995ITLX-1.6

1.8 (Note 2) STD LP3995ITL-1.8 LP3995ITLX-1.8

1.9 (Note 2) STD LP3995ITL-1.9 LP3995ITLX-1.9

2.1 (Note 2) STD LP3995ITL-2.1 LP3995ITLX-2.1

2.5 (Note 2) STD LP3995ITL-2.5 LP3995ITLX-2.5

2.8 (Note 2) STD LP3995ITL-2.8 LP3995ITLX-2.8

3.0 (Note 2) STD LP3995ITL-3.0 LP3995ITLX-3.0

For micro SMD Package

Grade LP3995 Supplied as 250

Units, Tape and Reel

For micro SMD Package unleaded

Grade LP3995 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)

1.5 STD LP3995ILD-1.5 LP3995ILDX-1.5 LO20B

1.6 STD LP3995ILD-1.6 LP3995ILDX-1.6 LO21B

1.8 STD LP3995ILD-1.8 LP3995ILDX-1.8 LO22B

1.9 (Note 2) STD LP3995ILD-1.9 LP3995ILDX-1.9 LO23B

2.1 (Note 2) STD LP3995ILD-2.1 LP3995ILDX-2.1 LO24B

2.5 (Note 2) STD LP3995ILD-2.5 LP3995ILDX-2.5 LO25B

2.8 STD LP3995ILD-2.8 LP3995ILDX-2.8 LO26B

3.0 STD LP3995ILD-3.0 LP3995ILDX-3.0 LO30B

3.3 (Note 2) STD LP3995ILD-3.3 LP3995ILDX-3.3 LO31B

Note 1: Available in sample quantities only

Note 2: For availability contact your local sales office

Grade LP3995 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 Temperature 150˚C

Lead/Pad Temperature
(Note 5)

micro SMD 260˚C

) −0.3 to 6.5V

IN

+ 0.3V)

IN

to 6.5V (max)

Operating Ratings (Note 3)

Input Voltage (V

Enable Input Voltage 0 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

LLP 235˚C

Storage Temperature −65 to +150˚C

Continuous Power

Internally Limited

Dissipation(Note 7)

ESD (Note 9)

Human Body Model 2 kV

Machine Model 200V

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)

Symbol Parameter Conditions Typical

V

IN

DEVICE OUTPUT: 1.5 ≤ V

∆V

OUT

Input Voltage 2.5 6.0 V

<

1.8V

OUT

Output Voltage Tolerance I

Line Regulation Error V

micro SMD

Load Regulation Error

LLP

Load Regulation Error

PSRR Power Supply Rejection Ratio

(Note 11)

DEVICE OUTPUT: 1.8 ≤ V

∆V

OUT

Output Voltage Tolerance I

OUT

<

2.5V

microSMDLine Regulation Error V

LLP

Line Regulation Error

micro SMD

Load Regulation Error

LLP

Load Regulation Error

PSRR Power 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 -50 50

OUT

=(V

IN

OUT(NOM)

=1mA

I

OUT

I

=1mAto150mA

OUT

=1mAto150mA

I

OUT

f = 1 kHz, I

f = 10 kHz, I

= 1 mA -50 50

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

=1mA 55

OUT

=1mA 53

OUT

OUT(NOM)

OUT(NOM)

=1mA 55

OUT

=1mA 50

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

Min Max

-75 75

Units

mV

-3.5 3.5 mV/V

10 75

70 125

µV/mA

µV/mA

dB

−75 75

mV

−2.5 2.5 mV/V

−3.5 3.5 mV/V

10 75

80 125

µV/mA

µV/mA

dB

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