DC769A datasheet, PDF - EEWORLD Datasheet

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DC769A: Descriptionboard eval for ltc3808ede; CategoryDevelopment board/suite/development tools; File Size195KB，4 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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board eval for ltc3808ede

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 769

SYNCHRONOUS STEP-DOWN CONVERTER WITH OUTPUT TRACKING

LTC3808EDE

DESCRIPTION

Demonstration circuit 769A is a high efficiency synchro-

nous step-down DC/DC converter with output tracking

and spread spectrum functions featuring the

LTC3808EDE controller. The demo board is capable of

providing 5A output current at 5V input. Burst

mode/Pulse skipping/Forced continuous operation is

selectable. The constant frequency current mode archi-

tecture with MOSFET V

sensing eliminates the need for

sense resistor and improves efficiency. The maximum

peak current sense threshold can be easily selected with

IPRG pin (See the table on the board).

Switching frequency is internally set at 550KHz. The fre-

quency can be adjusted using PLLLPF pin. Tying PLLLPF

pin to GND selects 300KHz operation; tying PLLLPF pin

to V

selects 750KHz operation. The switching frequency

can also be externally synchronized from 250KHz to

850KHz using SYNC terminal (JP5 selected).

The demo board can be selected to operate in spread

spectrum mode (JP2 selected) with significantly reduced

EMI noise.

The demo board has tracking function, allowing Vout to

track an external voltage signal at TRACK terminal dur-

ing start-up (JP6: Track).

Design files for this circuit board are available. Call

the LTC factory.

Table 1. Performance Summary (T

= 25°C)

PARAMETER

Input Voltage Range

OUT

Maximum load current I

OUT

Typical Output Ripple Voltage

Typical Switching Frequency

Typical Spread Spectrum Frequency Range

= 2.7-8V, I

OUT

= 0A to 5A

= 5V, V

OUT

= 1.8V

= 3.3V, I

OUT

= 3A, Fs=550KHz (20MHz BW)

PLLLPF Pin Floating; JP4 selected

JP2 selected (Spread Spectrum)

CONDITION

VALUE

2.7V to 8V

1.8V ±2.5%

23mV

P–P

550kHz

460kHz- 635kHz

QUICK START PROCEDURE

Demonstration circuit 769A is easy to set up to evaluate

the performance of LTC3808. Refer to Figure 1 for

proper measurement equipment setup and follow the

procedure below: (Initial jumper positions: JP3 se-

lected; JP6: Soft Start)

measuring the input or output voltage rip-

ple, care must be taken to avoid a long ground lead on

the oscilloscope probe. Measure the input or output

NOTE:

When

voltage ripple by touching the probe tip directly across

the Vin or Vout and GND terminals. See Figure 2 for

proper scope probe technique.

With power off, connect the input power supply to

+Vin (2.7V-8V) and GND (input return).

Connect the 1.8V load between Vout and GND (Initial

load: 0 A).

DC769A Related Products

	DC769A	LTC3808EGN#TRPBF	LTC3808EDE#PBF	LTC3808EDE#TRPBF	LTC3808EGN#PBF
Description	board eval for ltc3808ede	IC REG CTRLR BUCK 16SSOP	IC REG CTRLR BUCK 14-DFN	IC REG CTRLR BUCK 14-DFN	IC REG CTRLR BUCK 16SSOP
Brand Name	-	Linear Technology	Linear Technology	Linear Technology	Linear Technology
Is it Rohs certified?	-	conform to	conform to	conform to	conform to
Maker	-	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )
Parts packaging code	-	SSOP	DFN	DFN	SSOP
package instruction	-	SSOP,	HVSON, SOLCC14,.12,20	HVSSON,	SSOP, SSOP16,.25
Contacts	-	16	14	14	16
Manufacturer packaging code	-	GN	DE	DE	GN
Reach Compliance Code	-	compliant	compliant	compliant	compliant
ECCN code	-	EAR99	EAR99	EAR99	EAR99
Analog Integrated Circuits - Other Types	-	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER
control mode	-	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE
Maximum input voltage	-	9.8 V	9.8 V	9.8 V	9.8 V
Minimum input voltage	-	2.75 V	2.75 V	2.75 V	2.75 V
Nominal input voltage	-	4.2 V	4.2 V	4.2 V	4.2 V
JESD-30 code	-	R-PDSO-G16	R-PDSO-N14	R-PDSO-N14	R-PDSO-G16
JESD-609 code	-	e3	e3	e3	e3
length	-	4.89 mm	4 mm	4 mm	4.89 mm
Humidity sensitivity level	-	1	1	1	1
Number of functions	-	1	1	1	1
Number of terminals	-	16	14	14	16
Maximum operating temperature	-	70 °C	70 °C	70 °C	70 °C
Maximum output current	-	1 A	1 A	1 A	1 A
Package body material	-	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	-	SSOP	HVSON	HVSSON	SSOP
Package shape	-	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	-	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	-	260	250	260	250
Certification status	-	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	-	1.75 mm	0.8 mm	0.8 mm	1.75 mm
surface mount	-	YES	YES	YES	YES
Switch configuration	-	PUSH-PULL	PUSH-PULL	PUSH-PULL	PUSH-PULL
Maximum switching frequency	-	825 kHz	825 kHz	825 kHz	825 kHz
Temperature level	-	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL
Terminal surface	-	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	-	GULL WING	NO LEAD	NO LEAD	GULL WING
Terminal pitch	-	0.635 mm	0.5 mm	0.5 mm	0.635 mm
Terminal location	-	DUAL	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	-	30	NOT SPECIFIED	30	NOT SPECIFIED
width	-	3.899 mm	3 mm	3 mm	3.899 mm
Base Number Matches	-	1	1	-	1

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