Linear Technology LT3464ETS8 Manual de usuario

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 612

BOOST CONVERTER

LT3464ETS8

DESCRIPTION

Demonstration circuit 612 features the LT3464ETS8 in

two boost converter circuits, one configured for small

size and the other for high performance. The small size

circuit demonstrates the LT3464’s ability to operate with

a small 10µH chip inductor and a 0.22µF output capaci-

tor. The high performance circuit uses a 47µH inductor

and 1.0µF output capacitor and provides higher output

current and efficiency. Refer to Tables 1 and 2 for the

performance summary. The Burst Mode Operation of the

LT3464 allows the circuits to have a low input current at

no load and high efficiency over a broad current range

making it an ideal part for LCD bias applications as well

as cellular phones, digital cameras and handheld com-

puters. In addition, the LT3464’s integrated schottky re-

duces parts count, its integrated PNP disconnect switch

removes the load from the input during shutdown and

provides short circuit protection, and its CNTL pin allows

the output voltage to be externally controlled.

Design files for this circuit board are available. Call

the LTC factory.

Table 1.

Performance Summary for the Small Size Circuit

PARAMETER CONDITION VALUE

Input Voltage Range 2.3V to 10.0V

VOUT 0mA to IOUT(MAX) 20.0V ±4%

IOUT(MAX) VIN = 3.6V

VIN = 5.0V

VIN = 8.4V

3mA

4mA

6mA

Typical output ripple VIN = 3.6V, IOUT = 3mA 100mV p-p

Typical efficiency VIN = 3.6V, IOUT = 3mA 60%

Typical no load input current VIN = 3.6V, IOUT = 0mA 85µA

Table 2.

Performance Summary for the High Performance Circuit

PARAMETER CONDITION VALUE

Input Voltage Range 2.3V to 10.0V

OUT

0mA to IOUT(MAX) 15.0V ±4%

OUT(MAX)

= 3.6V

= 5.0V

= 8.4V

9mA

14mA

25mA

Typical output ripple VIN = 3.6V, IOUT = 9mA 100mV p-p

Typical efficiency VIN = 3.6V, IOUT = 9mA 77%

Typical no load input current VIN = 3.6V, IOUT = 0mA 60µA

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 612

BOOST CONVERTER

QUICK START PROCEDURE

Demonstration circuit 612 is easy to set up to evaluate

the performance of the LT3464ETS8. Refer to Figure 1

for proper measurement equipment setup and follow the

procedure below:

NOTE:

When measuring the input or output voltage ripple,

care must be taken to avoid a long ground lead on the

oscilloscope probe. Measure the input or output voltage

ripple by touching the probe tip directly across the Vin or

Vout and GND terminals. See Figure 2 for proper scope

probe technique.

Make sure the SHDN jumper is in the ON position and

the CNTL jumper is in the INT REF position.

Turn on the input voltage source and set it to 3.6V.

Monitor the output voltage. For the small size circuit,

the output voltage should be 20.0V ±4% and for the

high performance circuit, the output voltage should be

15.0V ±4%.

Apply the full rated load to the output for an input

voltage of 3.6V. For the small size circuit, this is 3mA

and for the high performance circuit, this is 9mA. The

output voltage should still be within regulation.

With full rated load applied and with the input voltage

still at 3.6V, measure the input current. For the small

size circuit, the input current should be less than

31.0mA. For the high performance circuit, the input

current should be less than 54.0mA.

Once the proper output voltages are established, ad-

just the loads within the operating range and observe

the output voltage regulation, ripple voltage, efficiency

and other parameters.

Figure 1.

Proper Measurement Equipment Setup

VIN

GND

Figure 2.

Measuring Input or Output Ripple

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 612

BOOST CONVERTER

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 612

BOOST CONVERTER

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Authorized Distributor

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Analog Devices Inc.:

DC612A

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