DC663A datasheet, PDF - EEWORLD Datasheet

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DC663A: Descriptionboard eval for ltc3736euf; CategoryDevelopment board/suite/development tools; File Size187KB，5 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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board eval for ltc3736euf

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2-PHASE DUAL SYNCHRONOUS STEP-DOWN CONVERTER WITH OUTPUT TRACKING

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 663

LTC3736EUF

DESCRIPTION

Demonstration circuit 663 is a 2-phase dual synchro-

nous high efficiency step-down DC/DC converter with

2.7V to 8V input range. It has two outputs: 2.5V (5A

MAX at 5V input) and 1.8V (5A MAX at 5V input). The

demo board features the LTC®3736EUF controller. The

constant frequency current mode architecture with

MOSFET V

sensing eliminates the need for sense re-

sistors and improves efficiency. Out of phase operation

significantly reduces peak input ripple current; thereby

reducing the noise and input capacitor size.

Switching frequency is internally set at 550kHz. For

noise sensitive applications, the converter can be exter-

nally synchronized from 250kHz to 850kHz. The fre-

quency can also be selected with PLLLPF pin. Tying

PLLLPF pin to GND selects 300kHz operation; tying

PLLLPF pin to VIN selects 750kHz operation.

The demo circuit has output tracking, allowing V

OUT2

track V

OUT1

during start-up.

Design files for this circuit board are available. Call

the LTC factory.

LTC is a trademark of Linear Technology Corporation

Table 1. Performance Summary (T

= 25°C)

PARAMETER

Input Voltage Range

OUT1

= 5V, I

OUT1

= 0A to 5A,

OUT2

= 0A to 5A

OUT2

= 5V, I

OUT1

= 0A to 5A,

OUT2

= 0A to 5A

Typical Output Ripple V

OUT1

Typical Output Ripple V

OUT2

Typical Switching Frequency

= 3.3V, I

OUT1

= 3A (20MHz BW)

= 3.3V, I

OUT2

= 3A (20MHz BW)

PLLLPF Pin Floating

18mV

P–P

26mV

P–P

550kHz

1.8V ±3%

CONDITION

VALUE

2.7V to 8V

2.5V ±3%

QUICK START PROCEDURE

Demonstration circuit 663 is easy to set up to evaluate

the performance of the LTC3736. Refer to Figure 1. for

proper measurement equipment setup and follow the

procedure below:

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

voltage ripple by touching the probe tip directly across

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

proper scope probe technique.

NOTE:

When

Connect the 2.5V load (Load 1 in Figure 1.) between

Vout1 and GND; connect the 1.8V load (Load 2 in Fig-

ure 1.) between Vout2 and GND. (Initial loads: no

load.)

Connect the DVMs to the input and outputs.

Turn on the input power supply and check for the

proper output voltages. Vout1 should be 2.5V+/-3%.

Vout2 should be 1.8V+/-3%.

With power off, connect the input power supply to Vin

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

DC663A Related Products

	DC663A	LTC3736EUF#TR	LTC3736EGN#TRPBF	LTC3736EUF#PBF	LTC3736EUF#TRPBF	LTC3736EGN#PBF
Description	board eval for ltc3736euf	IC reg ctrlr buck pwm CM 24-qfn	IC REG CTRLR BUCK 24SSOP	IC REG CTRLR BUCK 24QFN	IC REG CTRLR BUCK 24QFN	IC REG CTRLR BUCK 24SSOP
Brand Name	-	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology
Is it Rohs certified?	-	incompatible	conform to	conform to	conform to	conform to
Maker	-	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )
Parts packaging code	-	QFN	SSOP	QFN	QFN	SSOP
package instruction	-	HVQCCN, LCC24,.16SQ,20	SSOP, SSOP24,.24	HVQCCN, LCC24,.16SQ,20	HVQCCN, LCC24,.16SQ,20	SSOP, SSOP24,.24
Contacts	-	24	24	24	24	24
Manufacturer packaging code	-	UF	GN	UF	UF	GN
Reach Compliance Code	-	not_compliant	compliant	compliant	compliant	compliant
ECCN code	-	EAR99	EAR99	EAR99	EAR99	EAR99
Analog Integrated Circuits - Other Types	-	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER
control mode	-	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE
Control Technology	-	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION
Maximum input voltage	-	9.8 V	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	2.75 V
Nominal input voltage	-	4.2 V	4.2 V	4.2 V	4.2 V	4.2 V
JESD-30 code	-	S-PQCC-N24	R-PDSO-G24	S-PQCC-N24	S-PQCC-N24	R-PDSO-G24
JESD-609 code	-	e0	e3	e3	e3	e3
length	-	4 mm	8.649 mm	4 mm	4 mm	8.649 mm
Humidity sensitivity level	-	1	1	1	1	1
Number of functions	-	1	1	1	1	1
Number of terminals	-	24	24	24	24	24
Maximum operating temperature	-	70 °C	70 °C	70 °C	70 °C	70 °C
Maximum output current	-	1 A	1 A	1 A	1 A	1 A
Package body material	-	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	-	HVQCCN	SSOP	HVQCCN	HVQCCN	SSOP
Encapsulate equivalent code	-	LCC24,.16SQ,20	SSOP24,.24	LCC24,.16SQ,20	LCC24,.16SQ,20	SSOP24,.24
Package shape	-	SQUARE	RECTANGULAR	SQUARE	SQUARE	RECTANGULAR
Package form	-	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	SMALL OUTLINE, SHRINK PITCH	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	-	255	250	260	250	260
Certification status	-	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	-	0.8 mm	1.727 mm	0.8 mm	0.8 mm	1.727 mm
surface mount	-	YES	YES	YES	YES	YES
Switch configuration	-	PUSH-PULL	PUSH-PULL	PUSH-PULL	PUSH-PULL	PUSH-PULL
Maximum switching frequency	-	825 kHz	825 kHz	825 kHz	825 kHz	825 kHz
technology	-	CMOS	CMOS	CMOS	CMOS	CMOS
Temperature level	-	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL
Terminal surface	-	Tin/Lead (Sn/Pb)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	-	NO LEAD	GULL WING	NO LEAD	NO LEAD	GULL WING
Terminal pitch	-	0.5 mm	0.635 mm	0.5 mm	0.5 mm	0.635 mm
Terminal location	-	QUAD	DUAL	QUAD	QUAD	DUAL
Maximum time at peak reflow temperature	-	40	NOT SPECIFIED	30	NOT SPECIFIED	30
width	-	4 mm	3.899 mm	4 mm	4 mm	3.899 mm

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