Linear Technology LTC3440 Manual de usuario

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

Tabla de contenidos

Otros manuales de Convertidor de medios de Linear Technology

Linear Technology

Linear Technology LTC3864 Guía de configuración rápida

Linear Technology

Linear Technology DC1929A Guía de configuración rápida

Linear Technology

Linear Technology DC2490A Guía de configuración rápida

Linear Technology

Linear Technology DC1480A Guía de configuración rápida

Linear Technology

Linear Technology LT1933 Manual de usuario

Linear Technology

Linear Technology LTC1628 Manual de usuario

Linear Technology

Linear Technology DC257 Guía de configuración rápida

Linear Technology

Linear Technology LTC3765 Guía de configuración rápida

Linear Technology

Linear Technology DC1739A-B Guía de configuración rápida

Linear Technology

Linear Technology LTC3839EUH Guía de configuración rápida

Linear Technology

Linear Technology LTC3444 Manual de usuario

Linear Technology

Linear Technology DC1731A-A Guía de configuración rápida

Linear Technology

Linear Technology DC1687A Guía de configuración rápida

Linear Technology

Linear Technology LT8494 Guía de configuración rápida

Linear Technology

Linear Technology LT3464ETS8 Manual de usuario

Linear Technology

Linear Technology LT8302 Manual de instrucciones

Linear Technology

Linear Technology DC1745A Guía de configuración rápida

Linear Technology

Linear Technology DC1825A Guía de configuración rápida

Linear Technology

Linear Technology DC1883A Guía de configuración rápida

Linear Technology

Linear Technology LT1930ES5 Manual de usuario

Linear Technology

Linear Technology LTC3130EUD-1 Manual de usuario

Linear Technology

Linear Technology LTC3765 Guía de configuración rápida

Linear Technology

Linear Technology DC2056A Guía de configuración rápida

Linear Technology

Linear Technology DC2641A Guía de configuración rápida

Manuales populares de Convertidor de medios de otras marcas

SoundTraxx

SoundTraxx Blunami BLU-2200 Manual de usuario

SPROLINK

SPROLINK VA1 Manual de usuario

Acclaim Lighting

Acclaim Lighting DDC-1-AC Manual de usuario

Nikon

Nikon AF-S TC-20E III Manual de usuario

Axis

Axis AXIS Q7406 Manual de usuario

Omega

Omega TAC80B-J Manual de usuario

Zoom

Zoom Thunderbolt TAC-2R Manual de usuario

OST

OST iConverter 10/100M Manual de usuario

Vertiv

Vertiv Netsure Manual de usuario

birddog

birddog MINI Manual de usuario

Roland

Roland GI-10 Manual de usuario

Wallenstein

Wallenstein WX310 Manual de usuario

Pace

Pace MSS 200-1 Manual de usuario

Solar Converters

Solar Converters EQ 12/24-50 Manual de usuario

CYP

CYP EL-7400V Manual de usuario

TIE

TIE MIDI 1i1o Manual de usuario

DCS

DCS Vivaldi Upsampler Manual de usuario

Westermo

Westermo MCW-211 SERIES Manual de usuario