LP3999.pdf

December 2003

LP3999

Low Noise 150mA Voltage Regulator for RF/Analog

Applications

General Description

The LP3999 regulator is designed to meet the requirements

of portable wireless 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 requirements.

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 inclusion of an Enable(dis-

able) control can be used by the system to further extend the

battery lifetime by reducing the power consumption to virtu-

ally zero. Should the application require a device with an

active disable function please refer to device LP3995.

The LP3999 also features internal protection against short-

circuit currents and over-temperature conditions.

The LP3999 is designed to be stable with small 1.0 µF

ceramic capacitors. The small outline of the LP3999 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

of 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; ± 75mV / 2%

n 60 mV Typical Dropout with 150 mA Load. V out > 2.5V

n Virtually Zero Quiescent Current when Disabled

n 10 µVrms output noise over 10Hz to 100kHz

n Stable witha1µFOutput Capacitor

n Guaranteed 150 mA Output Current

n Fast Turn-on Time; 140 µs (Typ.)

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 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

n Handheld MP3 Devices

Typical Application Circuit

20052001

DS200520

www.national.com

Block Diagram

20052002

Pin Description

Package 5 pin micro SMD

Pin No.

Symbol

Name and Function

micro

SMD

LLP

V EN

Enable Input; Disables the Regulator when

≤

0.4V.

Enables the regulator when

≥

0.9V

GND

Common Ground

V OUT

Voltage output. Connect this output to the load circuit.

V IN

Voltage Supply Input

C BYPASS

Bypass Capacitor connection.

Connect a 0.01 µF capacitor for noise reduction.

N/C

No internal connection. There should not be any board connection to this pin.

Pad

GND

Ground connection.

Connect to ground plane for best thermal conduction.

www.national.com

Connection Diagrams

micro SMD, 5 Bump Package

20052003

See NS Package Number TLA05

LLP-6 Package (SOT23 footprint)

20052004

See NS Package Number LDE06A

www.national.com

Ordering Information

For micro SMD Package

Output Voltage

(V)

Grade

LP3999 Supplied as 250

Units, Tape and Reel

LP3999 Supplied as

3000 Units, Tape and

Reel

Package

Marking

1.5

STD

LP3999ITL-1.5

LP3999ITLX-1.5

1.6 (Note 2)

STD

LP3999ITL-1.6

LP3999ITLX-1.6

1.7 (Note 2)

STD

LP3999ITL-1.7

LP3999ITLX-1.7

1.8

STD

LP3999ITL-1.8

LP3999ITLX-1.8

1.875

STD

LP3999ITL-1.875

LP3999ITLX-1.875

1.9 (Note 2)

STD

LP3999ITL-1.9

LP3999ITLX-1.9

2.0 (Note 2)

STD

LP3999ITL-2.0

LP3999ITLX-2.0

2.1 (Note 2)

STD

LP3999ITL-2.1

LP3999ITLX-2.1

2.2 (Note 2)

STD

LP3999ITL-2.2

LP3999ITLX-2.2

2.4

STD

LP3999ITL-2.4

LP3999ITLX-2.4

2.5

STD

LP3999ITL-2.5

LP3999ITLX-2.5

2.6 (Note 2)

STD

LP3999ITL-2.6

LP3999ITLX-2.6

2.8

STD

LP3999ITL-2.8

LP3999ITLX-2.8

3.0 (Note 2)

STD

LP3999ITL-3.0

LP3999ITLX-3.0

3.3

STD

LP3999ITL-3.3

LP3999ITLX-3.3

For micro SMD Package UNLEADED

Output Voltage

(V)

Grade

LP3999 Supplied as 250

Units, Tape and Reel

LP3999 Supplied as

3000 Units, Tape and

Reel

Package

Marking

1.5 (Note 2)

STD

LP3999ITL-1.5 NOPB

LP3999ITLX-1.5 NOPB

1.6 (Note 2)

STD

LP3999ITL-1.6 NOPB

LP3999ITLX-1.6 NOPB

1.7 (Note 2)

STD

LP3999ITL-1.7 NOPB

LP3999ITLX-1.7 NOPB

1.8 (Note 2)

STD

LP3999ITL-1.8 NOPB

LP3999ITLX-1.8 NOPB

1.875 (Note 2)

STD

LP3999ITL-1.875 NOPB

LP3999ITLX-1.875 NOPB

1.9 (Note 2)

STD

LP3999ITL-1.9 NOPB

LP3999ITLX-1.9 NOPB

2.0 (Note 2)

STD

LP3999ITL-2.0 NOPB

LP3999ITLX-2.0 NOPB

2.1 (Note 2)

STD

LP3999ITL-2.1 NOPB

LP3999ITLX-2.1 NOPB

2.2 (Note 2)

STD

LP3999ITL-2.2 NOPB

LP3999ITLX-2.2 NOPB

2.4 (Note 2)

STD

LP3999ITL-2.4 NOPB

LP3999ITLX-2.4 NOPB

2.5 (Note 2)

STD

LP3999ITL-2.5 NOPB

LP3999ITLX-2.5 NOPB

2.6 (Note 2)

STD

LP3999ITL-2.6 NOPB

LP3999ITLX-2.6 NOPB

2.8 (Note 2)

STD

LP3999ITL-2.8 NOPB

LP3999ITLX-2.8 NOPB

3.0 (Note 2)

STD

LP3999ITL-3.0 NOPB

LP3999ITLX-3.0 NOPB

3.3 (Note 2)

STD

LP3999ITL-3.3 NOPB

LP3999ITLX-3.3 NOPB

www.national.com

Ordering Information (Continued)

For LLP-6 Package

Output Voltage

(V)

Grade

LP3999 Supplied as 1000

Units, Tape and Reel

LP3999 Supplied as

4500 Units, Tape and

Reel

Package

Marking

1.5 (Note 2)

STD

LP3999ILD-1.5

LP3999ILDX-1.5

L032B

1.6 (Note 2)

STD

LP3999ILD-1.6

LP3999ILDX-1.6

L033B

1.8 (Note 2)

STD

LP3999ILD-1.8

LP3999ILDX-1.8

L034B

1.875 (Note 2)

STD

LP3999ILD-1.875

LP3999ILDX-1.875

1.9 (Note 2)

STD

LP3999ILD-1.9

LP3999ILDX-1.9

L035B

2..0 (Note 2)

STD

LP3999ILD-2.0

LP3999ILDX-2.0

2.1 (Note 2)

STD

LP3999ILD-2.1

LP3999ILDX-2.1

L036B

2.2 (Note 2)

STD

LP3999ILD-2.2

LP3999ILDX-2.2

2.4 (Note 2)

STD

LP3999ILD-2.4

LP3999ILDX-2.4

2.5 (Note 2)

STD

LP3999ILD-2.5

LP3999ILDX-2.5

L037B

2.6 (Note 2)

STD

LP3999ILD-2.6

LP3999ILDX-2.6

2.8 (Note 2)

STD

LP3999ILD-2.8

LP3999ILDX-2.8

L038B

3.0 (Note 2)

STD

LP3999ILD-3.0

LP3999ILDX-3.0

L039B

3.3 (Note 2)

STD

LP3999ILD-3.3

LP3999ILDX-3.3

L040B

Note 1: Available in sample quantities only

Note 2: For availability contact your local sales office

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