Linear Technology LTC3440 Manuale utente

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 425B

1MHZ SYNCHRONOUS BUCK-BOOST

LTC3440

DESCRIPTION

Demonstration Circuit 425B is a constant-frequency

synchronous Buck-Boost converter using the

LTC3440. The input range is from 2.5V to 5.5V, mak-

ing it ideal for single-cell lithium-ion or three-cell

NiCd/NiMH battery applications. This converter pro-

vides up to 95% efficiency, much higher than tradi-

tional Buck-Boost converters. For 2.5V minimum in-

put voltage, this converter can provide up to 500mA

load current.

The output voltage is set at 3.3V. A different output

voltage in the range of 2.5V to 5.5V can be obtained

by changing one of the feedback resistors. The fre-

quency is set at 1MHz, which is a good trade-off be-

tween efficiency and size. The frequency can be modi-

fied by changing R6 or by synchronizing to an exter-

nal clock. In shutdown, the board draws about 2.5µA,

where 2µA goes through the 1MΩpull up resistor

(R4) and the IC itself draws less than 1µA.

Design files for this circuit board are available. Call

the LTC factory.

LTC is a trademark of Linear Technology Corporation

QUICK START GUIDE

Refer to Figure 1 for the connection diagram and fol-

low the procedure below:

Apply a voltage source to the input of the circuit

between the V

and GND terminals. The circuit will

start up at input voltage higher than 2.5V.

NOTE

Do not apply more than 5.5V to the input.

Attach a voltmeter or oscilloscope probe between

the V

OUT

and GND terminals of the circuit to monitor

the output. To start the circuit, the shunt at JP1

needs to be put in RUN position.

Attach a load to the output. The available output

current depends on the input voltage.

Figure 1. Proper Measurement Equipment Setup

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 425B

1MHZ SYNCHRONOUS BUCK-BOOST

PERFORMANCE SUMMARY

PARAMETER CONDITION VALUE

Input Voltage Range 2.5V to 5.5V

Maximum Load Current, Min V

OUT

= 3.3V, V

= 2.5V 500mA

Typical Output Ripple V

OUT

= 3.3V, I

OUT

= 500mA 13mV

P-P

Typical Operating Frequency R6 = 62K 1MHz

TYPICAL PERFORMANCE CHARACTERISTICS

100010

100

EFFICIENCY (%)



LOAD CURRENT (mA)

100

4.2V

3.6V

3.0V

2.7V



Figure 2. Efficiency vs. Load Current (without External Schottky Diodes)

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 425B

1MHZ SYNCHRONOUS BUCK-BOOST

Indice

Altri manuali Linear Technology Convertitore multimediale

Linear Technology

Linear Technology LTC3725 Manuale utente

Linear Technology

Linear Technology LTC1628 Manuale utente

Linear Technology

Linear Technology DC1929A Guida rapida alla configurazione

Linear Technology

Linear Technology LT3591 Manuale utente

Linear Technology

Linear Technology LTC2668 Guida rapida alla configurazione

Linear Technology

Linear Technology Analog Devices LT8301 Guida rapida alla configurazione

Linear Technology

Linear Technology DC1825A Guida rapida alla configurazione

Linear Technology

Linear Technology LT1933 Manuale utente

Linear Technology

Linear Technology LTM8045 Guida rapida alla configurazione

Linear Technology

Linear Technology LT1300 Manuale utente

Linear Technology

Linear Technology LTC3459ES6 Manuale utente

Linear Technology

Linear Technology DC1739A-B Guida rapida alla configurazione

Linear Technology

Linear Technology DC1887A Guida rapida alla configurazione

Linear Technology

Linear Technology LTC3864 Guida rapida alla configurazione

Linear Technology

Linear Technology DC2312A-A Guida rapida alla configurazione

Linear Technology

Linear Technology LTC3130EUD Guida rapida alla configurazione

Linear Technology

Linear Technology DC1228A Guida rapida alla configurazione

Linear Technology

Linear Technology LTC3725 Manuale utente

Linear Technology

Linear Technology DC2221A Guida rapida alla configurazione

Linear Technology

Linear Technology DC2372A Guida rapida alla configurazione

Linear Technology

Linear Technology DC193 Guida rapida alla configurazione

Linear Technology

Linear Technology DC1745A Guida rapida alla configurazione

Linear Technology

Linear Technology DEMO CIRCUIT 1672A Manuale utente

Linear Technology

Linear Technology LT8330 Manuale utente

Manuali Convertitore multimediale popolari di altre marche

SoundTraxx

SoundTraxx Blunami BLU-2200 Manuale utente

SPROLINK

SPROLINK VA1 Manuale utente

Acclaim Lighting

Acclaim Lighting DDC-1-AC Manuale utente

Nikon

Nikon AF-S TC-20E III Manuale utente

Axis

Axis AXIS Q7406 Manuale utente

Omega

Omega TAC80B-J Manuale utente

Zoom

Zoom Thunderbolt TAC-2R Manuale utente

OST

OST iConverter 10/100M Manuale utente

Vertiv

Vertiv Netsure Manuale utente

birddog

birddog MINI Manuale utente

Roland

Roland GI-10 Manuale utente

Wallenstein

Wallenstein WX310 Manuale utente

Pace

Pace MSS 200-1 Manuale utente

Solar Converters

Solar Converters EQ 12/24-50 Manuale utente

CYP

CYP EL-7400V Manuale utente

TIE

TIE MIDI 1i1o Manuale utente

DCS

DCS Vivaldi Upsampler Manuale utente

Westermo

Westermo MCW-211 SERIES Manuale utente