DC767A datasheet, PDF - EEWORLD Datasheet

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DC767A: Descriptionboard eval for ltc3447edd; CategoryDevelopment board/suite/development tools; File Size188KB，3 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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board eval for ltc3447edd

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 767

LTC3447

DESCRIPTION

Demonstration Circuit 767 is an I2C controlled high effi-

ciency synchronous current mode buck regulator featur-

ing the LTC3447. The circuit is ideally suited for single

Li-Ion battery powered applications such as PDAs and

other Handheld Devices. The I2C Power Rail, VCCD, can

be connected to the main Supply Voltage VCCC. Both

input voltage ranges are 2.5V

5.5V. The buck regula-

tor has a programmable output range of 0.7V to 2.00V

with a 1A switch. The initial start-up voltage is set to

1.35V by feedback resistors R4 and R5 (the maximum

Table 1. Performance Summary (T

= 25°C)

PARAMETER

VCCC Input Voltage Range

VCCD Input Voltage Range

OUT

Buck Output Voltage

Maximum Output Current

Switching Frequency

VCCC = 3V, V

OUT

= 1.3V

CONDITION

VALUE

2.5V

0.7V

600mA

1.0MHz Const.

5.5V

2.0V

SINGLE LI-ION BATTERY POWERED BUCK REGULATOR FOR PDA APPS

start-up voltage (equal to VCCC) can be set by changing

the R4 and R5 values). Automatic Burst Mode at light

loads extends battery life in portable systems. The Burst

Mode feature can be disabled using the I2C command.

Design files for this circuit board are available. Call

the LTC factory.

LT is a trademark of Linear Technology Corporation

QUICK START PROCEDURE

DC767 is easy to set up to evaluate the performance of

the LTC3447. Refer to Figure 1 for proper measurement

equipment setup and follow the procedure below:

Connect the DC767 to the DC410 via their 5 pin con-

nectors.

Run the LVDC767.exe User Interface program pro-

vided to issue the I2C command with the relevant in-

formation (note: the serpdrv file must be stored in the

same directory as the LVDC767.exe file).

To change the Buck voltage ... set the Buck Voltage

slider to whatever voltage you want the output to be

and click on the Buck Voltage slider's Write button.

Connect a 100mA load, LOAD1, between the VOUT

and GND terminals on the right hand side of the

board.

Apply 3.3V between the VCCC and GND terminals on

the left hand side of the board.

Apply 3.3V between the VCCD and GND terminals on

the left hand side of the board.

Connect the DC410 to the Computer’s serial port via a

9-pin RS232 cable.

Connect 8V – 10V to the VinExt and Gnd terminals on

the DC410 (ensure the JP2 jumper on the DC410 is in

the VinExt position and the JP1\JP3 jumpers are in

their RES positions).

DC767A Related Products

	DC767A	LTC3447EDD	LTC3447EDD#TRPBF	LTC3447EDD#PBF
Description	board eval for ltc3447edd	IC reg buck sync adj 0.6A 10dfn	IC REG BUCK ADJ 0.6A SYNC 10DFN	IC REG BUCK ADJ 0.6A SYNC 10DFN
Brand Name	-	Linear Technology	Linear Technology	Linear Technology
Is it Rohs certified?	-	incompatible	conform to	conform to
Maker	-	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )
Parts packaging code	-	DFN	DFN	DFN
package instruction	-	HVSSON, SOLCC10,.12,20	HVSSON,	HVSSON, SOLCC10,.12,20
Contacts	-	10	10	10
Manufacturer packaging code	-	DD	DD	DD
Reach Compliance Code	-	_compli	compliant	compliant
ECCN code	-	EAR99	EAR99	EAR99
Analog Integrated Circuits - Other Types	-	SWITCHING REGULATOR	SWITCHING REGULATOR	SWITCHING REGULATOR
control mode	-	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE
Maximum input voltage	-	5.5 V	5.5 V	5.5 V
Minimum input voltage	-	2.5 V	2.5 V	2.5 V
Nominal input voltage	-	3.6 V	3.6 V	3.6 V
JESD-30 code	-	S-PDSO-N10	S-PDSO-N10	S-PDSO-N10
JESD-609 code	-	e0	e3	e3
length	-	3 mm	3 mm	3 mm
Humidity sensitivity level	-	1	1	1
Number of functions	-	1	1	1
Number of terminals	-	10	10	10
Maximum operating temperature	-	70 °C	70 °C	70 °C
Maximum output current	-	0.8 A	0.8 A	0.8 A
Package body material	-	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	-	HVSSON	HVSSON	HVSSON
Package shape	-	SQUARE	SQUARE	SQUARE
Package form	-	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	-	235	250	260
Certification status	-	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	-	0.8 mm	0.8 mm	0.8 mm
surface mount	-	YES	YES	YES
Switch configuration	-	BUCK	BUCK	BUCK
Maximum switching frequency	-	1300 kHz	1300 kHz	1300 kHz
Temperature level	-	COMMERCIAL	COMMERCIAL	COMMERCIAL
Terminal surface	-	Tin/Lead (Sn/Pb)	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	-	NO LEAD	NO LEAD	NO LEAD
Terminal pitch	-	0.5 mm	0.5 mm	0.5 mm
Terminal location	-	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	-	20	NOT SPECIFIED	30
width	-	3 mm	3 mm	3 mm

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875p computer motherboard circuit diagram_023

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