Linear Technology LTC3526 User manual

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

This manual suits for next models

Other Linear Technology Motherboard manuals

Linear Technology

Linear Technology DC1398 User manual

Linear Technology

Linear Technology DC1765A Quick setup guide

Linear Technology

Linear Technology DC1811B-A Quick setup guide

Linear Technology

Linear Technology DC416 Quick setup guide

Linear Technology

Linear Technology DC1338A Quick setup guide

Linear Technology

Linear Technology DC1698A Quick setup guide

Linear Technology

Linear Technology DC1744A Quick setup guide

Linear Technology

Linear Technology 968A-B User manual

Linear Technology

Linear Technology DC1717A Quick setup guide

Linear Technology

Linear Technology 461A-A User manual

Linear Technology

Linear Technology 397 User manual

Linear Technology

Linear Technology DC1986A Quick setup guide

Linear Technology

Linear Technology DC2072A Quick setup guide

Linear Technology

Linear Technology DC2455A-B Quick setup guide

Linear Technology

Linear Technology DC866 User manual

Linear Technology

Linear Technology DC1987A Quick setup guide

Linear Technology

Linear Technology DC1668A-B Quick setup guide

Linear Technology

Linear Technology DC1678A Quick setup guide

Linear Technology

Linear Technology DC1386B User manual

Linear Technology

Linear Technology DC1839A Quick setup guide

Linear Technology

Linear Technology DC2461A User manual

Linear Technology

Linear Technology 1172A User manual

Linear Technology

Linear Technology DC1891A Quick setup guide

Linear Technology

Linear Technology DC875 User manual

Popular Motherboard manuals by other brands

DFI

DFI SD170 user manual

ASROCK

ASROCK ROMED8-2T user manual

Asus

Asus P2L97A user manual

Winmate

Winmate IC70 user manual

Asus

Asus MES-B user manual

Grantech

Grantech SYS8F377VGGA-3OMN user manual

Telit Wireless Solutions

Telit Wireless Solutions SL869-3DR user guide

Gigabyte

Gigabyte GA-9IVDT user manual

Texas Instruments

Texas Instruments ADS8372EVM user guide

Commell

Commell MS-C73 user manual

IBT Technologies

IBT Technologies MB860 user manual

Nvidia

Nvidia TEGRA DG-04927-001_V01 user guide

Biostar

Biostar M7VIT Bravo Description

Intel

Intel D33217CK specification

Asus

Asus F1A55-M LX PLUS R2.0 user manual

EPC

EPC EPC9147C quick start guide

Asus

Asus EX-B760M-V5 D4 quick start guide

EPOX

EPOX MU-8KHA0010 user manual