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

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