LM2614BTL 판매점 - 400mA Sub-Miniature Adjustable DC-DC Converter Optimized for RF Power Amplifiers

August 2002

LM2614

400mA Sub-Miniature Adjustable DC-DC Converter

Optimized for RF Power Amplifiers

General Description

The LM2614 DC-DC converter is optimized for powering RF

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

down an input voltage of 2.8V to 5.5V to an output of 1.0V to

3.6V at up to 400mA (300mA for B grade). Output voltage is

set using an analog input to VCON in the application circuit.

The device offers three modes for mobile phones and similar

RF PA applications. Fixed-frequency PWM mode minimizes

RF interference. A SYNC input allows synchronizing the

switching frequency in a range of 500kHz to 1MHz. Low

current hysteretic PFM mode reduces quiescent current to

160µA (typ.). Shutdown mode turns the device off and re-

duces battery consumption to 0.02µA (typ.).

Current limit and thermal shutdown features protect the de-

vice and system during fault conditions.

The LM2614 is available in a 10 bump micro SMD package.

This packaging uses National’s chip-scale micro SMD tech-

nology and offers the smallest possible size. A high switching

frequency (600kHz) allows use of tiny surface-mount com-

ponents.

The LM2614 can be dynamically controlled for output volt-

age changes from 1.0V to 3.6V in <30µs. The device fea-

tures external compensation to tailor the response to a wide

range of operating conditions.

Key Specifications

n Operates from a single LiION cell (2.8V to 5.5V)

n Adjustable output voltage (1.0V to 3.6V)

n ±1% DC feedback voltage precision

n 400mA maximum load capability(300mA for B grade)

n 600µA typ PWM mode quiescent current

n 0.02µA typ shutdown current

n 600kHz PWM switching frequency

n SYNC input for PWM mode frequency synchronization

from 500kHz to 1MHz

n High efficiency (96% typ at 3.9VIN, 3.6VOUT and 200mA)

in PWM mode from internal synchronous rectification

n 100% Maximum Duty Cycle for Lowest Dropout

Features

n Sub-miniature 10-bump thin micro SMD package

n Uses small ceramic capacitors

n 5mV typ PWM mode output voltage ripple(COUT = 22µF)

n Internal soft start

n Current overload protection

n Thermal Shutdown

n External compensation

Applications

n Mobile Phones

n Hand-Held Radios

n RF PC Cards

n Battery Powered RF Devices

LM2614BTL 반도체 회로 부품 판매점

400mA Sub-Miniature Adjustable DC-DC Converter Optimized for RF Power Amplifiers

국내 전력반도체 판매점

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