Linear Technology LT3473EDD Manuale utente

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 883

LI-ION TO 25V STEP-UP DC-DC CONVERTER

LT3473EDD

DESCRIPTION

Demonstration circuit DC883 features the LT®3473

micropower step-up DC/DC converters with inte-

grated Schottky diode and output disconnect cir-

cuitry. The output on DC883 is 25V at up to 80mA

from a 3~4.2V input, while automatic Burst Mode op-

eration maintains efficiency at light load. The lithium

ion battery input voltage range, high output voltage,

internal NPN power switch, minimal external compo-

nents and simple design make the LT3473 an excel-

lent solution for OLED and CCD Bias.

The DC883 has a jumper for enabling the output

(JP2). Placing the jumper to “OFF”, disables the DC-

DC converter and jumper to “ON”, enables the DC-DC

converter. There is a jumper (JP1) and a control pin

(CTRL) for varying the output voltage. Placing the

jumper to “VIN” provides 25V output. Placing the

jumper to “CTRL” and changing the voltage at CTRL

pin can change the output voltage. The voltage of the

PGOOD pin is approximately 0V as the output voltage

reaches 90% of final value.

Design files for this circuit board are available. Call

the LTC factory.

LT is a registered trademark of Linear Technology Corporation

Table 1.

Performance Summary ( TA= 25°

°°

°C )

PARAMETER CONDITION VALUE

Minimum Input Voltage 3V

Maximum Input Voltage 4.2V

Maximum Output Current Vin = 3 − 4.2V 80mA

Typical Switching Frequency 1.2MHz

QUICK START PROCEDURE

Demonstration circuit 883 is easy to set up to evalu-

ate the performance of the LT3473. Refer to Figure 1.

for proper measurement equipment setup and follow

the procedure below:

1. Set the input supply between 3V to 4.2V.

With power off, connect the input power sup-

ply to VIN and GND. Make sure JP2 is set to

“ON” and JP1 is set to “VIN”.

2. Turn on the power at the input.

3. The output voltage should measure about 25V

across the “VOUT” terminal to “GND” terminal

and the voltage across the PGOOD pin and

“GND” terminal should measure about 0V.

4. Test the shutdown function by placing JP2 to

“OFF”. Observe the output voltage is about

0.7V lower than the input voltage.

5. The output voltage can be controlled by DC

voltage at the CTRL terminal. With JP2 placed

at “ON” and JP1 placed at “CTRL”, observe

the output voltage change with DC voltage

applied to the CTRL terminal. The DC voltage

range recommended is 200mV ~ 1.5V. The

maximum DC voltage is 10V. Refer to the

datasheet for further details.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 883

LI-ION TO 25V STEP-UP DC-DC CONVERTER

AVV

Load

+++

Figure 1. Proper Measurement Equipment Setup

Figure 2. Scope Probe Placement for Measuring Input or Output Ripple

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 883

LI-ION TO 25V STEP-UP DC-DC CONVERTER

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Analog Devices Inc.:

DC883A

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