DC1359A datasheet, PDF - EEWORLD Datasheet

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DC1359A: Descriptionboard eval for lt3640efe; CategoryDevelopment board/suite/development tools; File Size310KB，4 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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board eval for lt3640efe

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DEMO CIRCUIT 1359

QUICK START

LT3640

GUIDE

LT3640

Dual Monolithic Buck Regulator with Power-

On Reset and Watchdog Timer

DESCRIPTION

Demonstration circuit 1359 is a Dual Monolithic Buck

Regulator with Power-On Reset and Watchdog Timer

featuring the LT3640. The board operates from inputs up

to 35V and withstands transients up to 55V. The outputs

are 3.3V, 0.8A and 1.2V, 1A. At light loads, both regula-

tors operate in low ripple Burst Mode® to maintain high

efficiency and low output ripple. Users can populate R13

on the EN/UVLO pin to provide a programmable under

voltage lockout. Both channels have cycle-by-cycle cur-

rent limit, providing protection against shorted outputs.

The power-on reset and watchdog timer periods are in-

dependently adjustable using external capacitors. Tight

accuracy specifications and glitch immunity ensure reli-

able operation of the circuit. Watchdog can be enabled or

disabled by JP1.

The circuit can be synchronized to an external clock con-

nected to the SYNC terminal. If the SYNC function is

used, the Rt resistor (R9) should be chosen to set the

LT3640 internal switching frequency at least 20% below

the lowest synchronization input frequency.

The LT3640 datasheet gives complete descriptions of the

part, operation and application information. The data-

sheet must be read in conjunction with this quick start

guide for working on or modifying the demo circuit

1359.

Design files for this circuit board are available. Call

the LTC factory.

, LTC, LTM, LT are trademarks of Linear Technology Corporation. Other product names

may be trademarks of the companies that manufacture the products.

PERFORMANCE SUMMARY

Specifications are at TA = 25°C

SYMBOL

OUT1

OUT2

OUT1

OUT2

WDU

WDL

RST

PARAMETER

Input Supply Range

Output Voltage 1

Output Voltage 2

Output Current 1

Output Current 2

No Load Quiescent Current

Switching Frequency

Watchdog Upper Boundary Period

Watchdog Lower Boundary Period

Programmed Reset Period

CONDITIONS

OUT1

= 3.3V, I

OUT1

= 0.8A

OUT2

= 1.2V, I

OUT2

= 1A

= 12V, I

OUT1

= 0.8A

= 12V, I

OUT2

= 1A

MIN

3.20

1.16

3.30

1.20

TYP

MAX

3.40

1.24

0.8

UNITS

MHz

= 12V, V

OUT1

= 3.3V, V

OUT2

= 1.2V, No

Load

1.75

C7 = 1500pF

C8 = 1500pF

0.33

55.5

3.5

55.5

2.35

DC1359A Related Products

	DC1359A	LT3640IFE#TRPBF	LT3640IUFD#PBF	LT3640EFE#TRPBF	LT3640EUFD#PBF	LT3640EUFD#TRPBF	LT3640IUFD#TRPBF	LT3640IFE#PBF	LT3640EFE#PBF
Description	board eval for lt3640efe	IC REG BCK ADJ 1.1A/1.3A 28TSSOP	IC REG BUCK ADJ 1.1A/1.3A 28QFN	IC REG BCK ADJ 1.1A/1.3A 28TSSOP	IC REG BUCK ADJ 1.1A/1.3A 28QFN	IC REG BUCK ADJ 1.1A/1.3A 28QFN	IC REG BUCK ADJ 1.1A/1.3A 28QFN	IC REG BCK ADJ 1.1A/1.3A 28TSSOP	IC REG BCK ADJ 1.1A/1.3A 28TSSOP
Brand Name	-	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology
Is it Rohs certified?	-	conform to	conform to	conform to	conform to	conform to	conform to	conform to	conform to
Maker	-	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	-	Linear ( ADI )	Linear ( ADI )	-	Linear ( ADI )
Parts packaging code	-	TSSOP	QFN	TSSOP	QFN	QFN	QFN	TSSOP	TSSOP
package instruction	-	HTSSOP, TSSOP28,.25	HVQCCN, LCC28,.16X.2,20	HTSSOP, TSSOP28,.25	HVQCCN, LCC28,.16X.2,20	HVQCCN, LCC28,.16X.2,20	HVQCCN, LCC28,.16X.2,20	HTSSOP, TSSOP28,.25	HTSSOP, TSSOP28,.25
Contacts	-	28	28	28	28	28	28	28	28
Manufacturer packaging code	-	FE	UFD	FE	UFD	UFD	UFD	FE	FE
Reach Compliance Code	-	compliant	compliant	compliant	compliant	compliant	compliant	compliant	compliant
ECCN code	-	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Other features	-	PFM CONTROL TECHNIQUE ALSO POSSIBLE	PFM CONTROL TECHNIQUE ALSO POSSIBLE	PFM CONTROL TECHNIQUE ALSO POSSIBLE	PFM CONTROL TECHNIQUE ALSO POSSIBLE	PFM CONTROL TECHNIQUE ALSO POSSIBLE	PFM CONTROL TECHNIQUE ALSO POSSIBLE	PFM CONTROL TECHNIQUE ALSO POSSIBLE	PFM CONTROL TECHNIQUE ALSO POSSIBLE
Analog Integrated Circuits - Other Types	-	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER	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	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE
Control Technology	-	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION
Maximum input voltage	-	30 V	30 V	30 V	30 V	30 V	30 V	30 V	30 V
Minimum input voltage	-	5 V	5 V	5 V	5 V	5 V	5 V	5 V	5 V
Nominal input voltage	-	12 V	12 V	12 V	12 V	12 V	12 V	12 V	12 V
JESD-30 code	-	R-PDSO-G28	R-PQCC-N28	R-PDSO-G28	R-PQCC-N28	R-PQCC-N28	R-PQCC-N28	R-PDSO-G28	R-PDSO-G28
JESD-609 code	-	e3	e3	e3	e3	e3	e3	e3	e3
length	-	9.7 mm	5 mm	9.7 mm	5 mm	5 mm	5 mm	9.7 mm	9.7 mm
Humidity sensitivity level	-	1	1	1	1	1	1	1	1
Number of functions	-	1	1	1	1	1	1	1	1
Number of terminals	-	28	28	28	28	28	28	28	28
Maximum operating temperature	-	125 °C	125 °C	125 °C	125 °C	125 °C	125 °C	125 °C	125 °C
Maximum output current	-	3.4 A	3.4 A	3.4 A	3.4 A	3.4 A	3.4 A	3.4 A	3.4 A
Package body material	-	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	-	HTSSOP	HVQCCN	HTSSOP	HVQCCN	HVQCCN	HVQCCN	HTSSOP	HTSSOP
Encapsulate equivalent code	-	TSSOP28,.25	LCC28,.16X.2,20	TSSOP28,.25	LCC28,.16X.2,20	LCC28,.16X.2,20	LCC28,.16X.2,20	TSSOP28,.25	TSSOP28,.25
Package shape	-	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	-	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	-	260	260	260	260	260	260	260	260
Certification status	-	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	-	1.2 mm	0.8 mm	1.2 mm	0.8 mm	0.8 mm	0.8 mm	1.2 mm	1.2 mm
surface mount	-	YES	YES	YES	YES	YES	YES	YES	YES
Switch configuration	-	PHASE-SHIFT	PHASE-SHIFT	PHASE-SHIFT	PHASE-SHIFT	PHASE-SHIFT	PHASE-SHIFT	PHASE-SHIFT	PHASE-SHIFT
Maximum switching frequency	-	2350 kHz	2350 kHz	2350 kHz	2350 kHz	2350 kHz	2350 kHz	2350 kHz	2350 kHz
technology	-	BIPOLAR	BIPOLAR	BIPOLAR	BIPOLAR	BIPOLAR	BIPOLAR	BIPOLAR	BIPOLAR
Temperature level	-	AUTOMOTIVE	AUTOMOTIVE	OTHER	OTHER	OTHER	AUTOMOTIVE	AUTOMOTIVE	OTHER
Terminal surface	-	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	-	GULL WING	NO LEAD	GULL WING	NO LEAD	NO LEAD	NO LEAD	GULL WING	GULL WING
Terminal pitch	-	0.65 mm	0.5 mm	0.65 mm	0.5 mm	0.5 mm	0.5 mm	0.65 mm	0.65 mm
Terminal location	-	DUAL	QUAD	DUAL	QUAD	QUAD	QUAD	DUAL	DUAL
Maximum time at peak reflow temperature	-	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED
width	-	4.4 mm	4 mm	4.4 mm	4 mm	4 mm	4 mm	4.4 mm	4.4 mm

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