lm2706 National Semiconductor Corporation, lm2706 Datasheet

lm2706

Manufacturer Part Number

lm2706

Description

Miniature, Variable, Step-down Dc-dc Converter With Bypass For Rf Power Amplifiers

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM2706.pdf (15 pages)

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LM2706

Miniature, Variable, Step-Down DC-DC Converter with

Bypass for RF Power Amplifiers

General Description

The LM2706 DC-DC converter is optimized for powering RF

power amplifiers (PAs) from a single Lithium-Ion cell. It may

also be used in many other applications. It steps down an

input voltage from 2.7V to 5.5V to a variable output from

1.5V to 3.25V up to 300 mA. Output voltage is set using a

of the RF PA. An internal bypass switch allows direct con-

nection to the battery for maximum power to the RF PA.

The device offers 4 modes for mobile phones and similar RF

PA applications. Fixed-frequency PWM mode minimizes RF

interference. Forced Bypass mode turns on an internal by-

pass switch to power the PA directly from the battery. Auto-

matic bypass mode minimizes dropout by turning on the

bypass switch when the battery decays to near the output

voltage. Shutdown mode turns the device off and reduces

battery consumption to 0.1 µA (typ.).

The device also offers internal synchronous rectification for

high efficiency (95% typ at 3.25 V

Current limit and thermal overload protection protects the

device and system during fault conditions.

The LM2706 is available in a 10-pin lead free micro SMD

package. This packaging uses National’s chip-scale micro

SMD technology and offers the smallest possible size. A high

switching frequency (600 kHz) allows use of tiny surface-

mount components. Only three small external surface-mount

components, an inductor and two ceramic capacitors, are

required.

Key Specifications

n Operates from a single LiION cell (2.7V to 5.5V)

n Variable output voltage (1.5V to 3.25V)

Typical Application Circuit

CON

analog input for controlling power levels and efficiency

OUT

, 200 mA, 3.9 V

DS200409

n Internal 105 mΩ (typ) bypass switch

n 300 mA maximum load capability

n 1.4 mA typ quiescent current

n 0.1 µA typ shutdown current

n 600 kHz PWM switching frequency

n High efficiency (95% typ at 3.9 V

Features

n Forced and Automatic Bypass modes

n Miniature 10-pin lead free micro SMD package

n Only three tiny surface-mount external components

n Uses small ceramic capacitors

n Low output voltage ripple (

n Internal soft start

n Current overload protection

n No external compensation

Applications

n Mobile Phones

n Hand-Held Radios

n RF PC Cards

n Battery Powered RF Devices

200 mA) from internal synchronous rectification

required

2% DC output voltage precision

10 mV typ)

PRELIMINARY

, 3.25 V

February 2004

OUT

www.national.com

20040901

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