Linear Technology LTC3526 Manuel utilisateur

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT

1053A-A through 1053A-D

SYNCHRONOUS BOOST DC/DC CONVERTER

LTC3526/3526B/3526-2/3526B-2

DESCRIPTION

Demonstration circuits 1053A-A through 1053A-

D are high efficiency synchronous boost con-

verters capable of operating with an input volt-

age range from 0.9V to 5.5V. The 2X2 mm DFN

thermally enhanced package with a 1MHz

switching frequency (2MHz for LTC3526-2) and

the 500mA internal switches provide a very tiny

solution. The LTC3526 also features output dis-

connect and the input voltage can be greater or

less than the output voltage.

This demonstration circuit allows the user to

quickly evaluate the LTC3526 performance. In-

dividual jumpers are provided for selecting sev-

eral regulated output voltages and a low quies-

cent current shutdown. Terminals on the board

allow easy hookup to an input supply and out-

put load.

Design files for this circuit board are available.

Call the LTC factory.

LTC and Burst Mode are trademarks of Linear Technol-

ogy Corporation

Table 1. Typical Specifications (25°C)

Input Voltage Range V

1V to 5V

1.8V V

OUT

= 1V, I

OUT

= 100mA 1.8V ± 2.5%

3.3V V

OUT

= 1.5V, I

OUT

= 100mA 3.3V ± 2.5%

5V V

OUT

= 1.5V, I

OUT

= 100mA 5.0V ± 2.5%

Output Ripple Voltage (burst mode) V

= 1.2V, V

OUT

= 1.8V I

OUT

= 1mA 45mV p-p

Output Ripple Voltage (fixed frequency) V

= 1.2V, V

OUT

= 1.8V I

OUT

= 100mA 10mV p-p

Efficiency V

= 1.2V, V

OUT

= 1.8V I

OUT

= 50mA 85%

Efficiency V

= 2.5V, V

OUT

= 3.3V I

OUT

= 50mA 92%

Input

Power

Supply

A+

-V

Resistive

Load

Figure 1. Demonstration Circuit Test Setup

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT

1053A-A through 1053A-D

SYNCHRONOUS BOOST DC/DC CONVERTER

Table 2. Demonstration Circuit Board Information

1053A-A LTC3526EDC LCHW 1MHz Burst

1053A-B LTC3526BEDC LCNN 1MHz No Burst

1053A-C LTC3526-2EDC LCNM 2MHz Burst

1053A-D LTC3526B-2EDC LCNP 2MHz No Burst

Board

Number LTC Part Part

Marking Frequency Mode

QUICK START PROCEDURE

There is one demonstration circuit board for

all four LTC3526 versions. The boards are

identified by the handwritten information on

the top of the pc board.

The boost converter can be evaluated using

the setup shown in Figure 1. Select one of the

three output voltages using jumpers JP1

through JP3. (With no jumpers installed, the

output voltage is 5V.) Set jumper JP4 in the

ON position and connect voltmeters and am-

meters as shown on the test setup. Connect a

power supply to the VIN and GND terminals

and a suitable load resistor between VOUT

and GND.

With a light load (1k resistor) at the output,

begin increasing the input power supply volt-

age. At approximately 850mV, the output will

rise to the selected regulated voltage. In-

crease the input voltage to approximately

1.5V and increase the load current.

Note the excellent load regulation when going

from a light load current to a heavier load, but

it is important to monitor the input voltage di-

rectly at the input terminals of the circuit

board. At very low input voltages, voltage

drops in the power supply wire, connections

and Ammeter will result in the input voltage at

the input terminals dropping below the mini-

mum voltage required for operation.

Additional pc board pads are provided for an

optional input bypass capacitor (C1). It may

be necessary when using long wires between

the power supply and circuit board, or for add-

ing a tantalum capacitor to minimize input

voltage transients that may occur when the

input is hot-switched. Also, pads on the board

backside are provided for adding a small

Schottky diode (D1) which can increase the

efficiency slightly under some conditions. But

adding a diode defeats the output disconnect

and short circuit protection features.

When verifying output ripple, it is important to

use the scope probe connection as shown in

Figure 3.

In Burst mode with light load current, the out-

put ripple voltage is higher than in non-burst

mode.

See LTC3526 Data Sheet for additional information

OUT

GND

Figure 3. Scope Probe Placement for

Measuring Output Ripple Voltage

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1053A-A

THROUGH D

SYNCHRONOUS BOOST DC/DC CONVERTER

Ce manuel convient aux modèles suivants

Autres manuels Linear Technology Carte mère

Linear Technology

Linear Technology Analog Devices DC1890A Guide de configuration rapide

Linear Technology

Linear Technology DC2070A Guide de configuration rapide

Linear Technology

Linear Technology DC2226A Guide de configuration rapide

Linear Technology

Linear Technology DC1238B Manuel utilisateur

Linear Technology

Linear Technology DC503A Manuel utilisateur

Linear Technology

Linear Technology DC1788B Guide de configuration rapide

Linear Technology

Linear Technology DC1811B-A Guide de configuration rapide

Linear Technology

Linear Technology DC2026 Guide de configuration rapide

Linear Technology

Linear Technology DC1962C Guide de configuration rapide

Linear Technology

Linear Technology DC2001A Guide de configuration rapide

Linear Technology

Linear Technology DC1794A Guide de configuration rapide

Linear Technology

Linear Technology DC1959A Guide de configuration rapide

Linear Technology

Linear Technology 1315 Manuel utilisateur

Linear Technology

Linear Technology DC2194A Guide de configuration rapide

Linear Technology

Linear Technology DC1977A-A Guide de configuration rapide

Linear Technology

Linear Technology DC1636A Guide de configuration rapide

Linear Technology

Linear Technology Analog Devices DC2564A Guide de configuration rapide

Linear Technology

Linear Technology DC1562B Guide de configuration rapide

Linear Technology

Linear Technology DC2268A-E Guide de configuration rapide

Linear Technology

Linear Technology DC2491A Guide de configuration rapide

Linear Technology

Linear Technology DC2442A Manuel utilisateur

Linear Technology

Linear Technology DC1705A Guide de configuration rapide

Linear Technology

Linear Technology DC2181A-A Guide de configuration rapide

Linear Technology

Linear Technology LTC2268-14 Manuel utilisateur

Manuels Carte mère populaires d'autres marques

DFI

DFI SD170 Manuel utilisateur

ASROCK

ASROCK ROMED8-2T Manuel utilisateur

Asus

Asus P2L97A Manuel utilisateur

Winmate

Winmate IC70 Manuel utilisateur

Asus

Asus MES-B Manuel utilisateur

Grantech

Grantech SYS8F377VGGA-3OMN Manuel utilisateur

Telit Wireless Solutions

Telit Wireless Solutions SL869-3DR Manuel utilisateur

Gigabyte

Gigabyte GA-9IVDT Manuel utilisateur

Texas Instruments

Texas Instruments ADS8372EVM Manuel utilisateur

Commell

Commell MS-C73 Manuel utilisateur

IBT Technologies

IBT Technologies MB860 Manuel utilisateur

Nvidia

Nvidia TEGRA DG-04927-001_V01 Manuel utilisateur

Biostar

Biostar M7VIT Bravo Instructions d'utilisation et d'installation

Intel

Intel D33217CK Manuel utilisateur

Asus

Asus F1A55-M LX PLUS R2.0 Manuel utilisateur

EPC

EPC EPC9147C Manuel utilisateur

Asus

Asus EX-B760M-V5 D4 Manuel utilisateur

EPOX

EPOX MU-8KHA0010 Manuel utilisateur