DC432A datasheet, PDF - EEWORLD Datasheet

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DC432A: Descriptionboard eval for ltc1879egn; CategoryDevelopment board/suite/development tools; File Size476KB，5 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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board eval for ltc1879egn

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 432

HIGH EFFICIENCY SYNCHRONOUS STEP-DOWN REGULATOR

LTC1875 or LTC1879

DESCRIPTION

Demonstration circuit 432 is a step-down converter, fea-

turing either the LTC1875 or LTC1879 high frequency

monolithic switching regulators. With an input voltage

range from 2.65V to 6V, the LTC1875 is ideal for Li-Ion

applications, such as PDAs, cellular phones, and digital

cameras. For applications with higher input voltages, the

LTC1879 is the choice with its maximum input voltage

limit of 10V. Both devices have switch current limits over

1A (LTC1875-1.6A, LTC1879-1.8A), which allows these

Table 1. Performance Summary

PARAMETER

Minimum Input Voltage

Maximum Input Voltage

(

LTC1875)

Maximum Input Voltage (LTC1879)

OUT (

LTC1875)

OUT

(LTC1879)

OUT (

LTC1875)

OUT

(LTC1879)

Nominal Switching Frequency

OUT

= 0A to 1.5A

OUT

= 0A to 1.2A

CONDITION

VALUE

2.65V

10V

0.8V ±2% to V

±2%

0.8V ±2% to V

±2%

1.5A

1.2A

550kHz

ICs to deliver high(er) power to small, low-profile appli-

cations. While the standard operating frequency of both

parts is 550 kHz, the switching can be externally set as

high as 750 kHz. All these features make the LTC1879

(DC432A) or LTC1875 (DC432B) perfectly suited for bat-

tery-powered, surface mount applications.

Design files for this circuit board are available. Call

the LTC factory.

QUICK START PROCEDURE

Demonstration circuit 432 is easy to set up to evaluate

the performance of the LTC1875 or LTC1879. Refer to

Figure 1 for proper measurement equipment setup and

follow the procedure below:

When measuring the input or output voltage ripple, care

must be taken to avoid a long ground lead on the oscil-

loscope probe. Measure the input or output voltage rip-

ple by touching the probe tip directly across the Vin or

Vout and GND terminals. Refer to Figure 2 for proper

placement of the scope probe.

Place jumper JP2 in the SHDN position.

Select the desired output voltage, using jumper JP3.

Connect the load between the Vout and GND termi-

nals on the bottom right-side of the board.

With power off, connect the input power supply to Vin

and GND (which are at the bottom left-side of the

board). Turn on the power at the input.

NOTE:

If evaluating the LTC1875, do not exceed 6V in-

put; if evaluating the LTC1879, do not exceed 10V in.

Place jumper JP2 in the RUN position.

Check for the proper output voltages.

If there is no output, temporarily disconnect the load

to make sure that the load is not set too high.

Once the proper output voltages are established, ad-

The fixed output options are 1.8V, 2.5V, and 3.3V. Too

set the output voltage to a custom value, insert a re-

sistor into RFB5.

just the loads within the operating range and observe

the output voltage regulation, ripple voltage, efficiency

and other parameters.

DC432A Related Products

	DC432A	LTC1879EGN#TR	LTC1879EGN#TRPBF	LTC1879EGN#PBF
Description	board eval for ltc1879egn	IC reg buck sync adj 1.2A 16ssop	IC REG BUCK ADJ 1.2A SYNC 16SSOP	Output current: 1.2A Switch operating frequency: 550kHz Output type: Adjustable Number of output voltage channels: 1 Function type: Step-Down Output configuration: Positive
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	-	SSOP	SSOP	SSOP
package instruction	-	SSOP, SSOP16,.25	SSOP, SSOP16,.25	SSOP, SSOP16,.25
Contacts	-	16	16	16
Manufacturer packaging code	-	GN	GN	GN
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
Control Technology	-	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION
Maximum input voltage	-	10 V	10 V	10 V
Minimum input voltage	-	2.65 V	2.65 V	2.65 V
Nominal input voltage	-	5 V	5 V	5 V
JESD-30 code	-	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16
JESD-609 code	-	e0	e3	e3
length	-	4.9 mm	4.9 mm	4.9 mm
Humidity sensitivity level	-	1	1	1
Number of functions	-	1	1	1
Number of terminals	-	16	16	16
Maximum operating temperature	-	85 °C	85 °C	85 °C
Minimum operating temperature	-	-40 °C	-40 °C	-40 °C
Maximum output current	-	3 A	3 A	3 A
Package body material	-	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	-	SSOP	SSOP	SSOP
Encapsulate equivalent code	-	SSOP16,.25	SSOP16,.25	SSOP16,.25
Package shape	-	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	-	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	-	235	250	260
Certification status	-	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	-	1.75 mm	1.75 mm	1.75 mm
surface mount	-	YES	YES	YES
Switch configuration	-	BUCK	BUCK	BUCK
Maximum switching frequency	-	605 kHz	605 kHz	605 kHz
technology	-	CMOS	CMOS	CMOS
Temperature level	-	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL
Terminal surface	-	Tin/Lead (Sn/Pb)	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	-	GULL WING	GULL WING	GULL WING
Terminal pitch	-	0.635 mm	0.635 mm	0.635 mm
Terminal location	-	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	-	20	NOT SPECIFIED	30
width	-	3.9116 mm	3.9116 mm	3.9116 mm

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