LT1676IS8#TR datasheet, PDF - EEWORLD Datasheet

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LT1676IS8#TR: DescriptionLT1676 - Wide Input Range, High Efficiency, Step-Down Switching Regulator; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C; CategoryPower/power management The power supply circuit; File Size137KB，16 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LT1676IS8#TR Overview

LT1676 - Wide Input Range, High Efficiency, Step-Down Switching Regulator; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C

LT1676IS8#TR Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	incompatible
Maker	Linear ( ADI )
Parts packaging code	SOIC
package instruction	SOP, SOP8,.25
Contacts	8
Manufacturer packaging code	S8
Reach Compliance Code	not_compliant
ECCN code	EAR99
Analog Integrated Circuits - Other Types	SWITCHING REGULATOR
control mode	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION
Maximum input voltage	60 V
Minimum input voltage	7.4 V
Nominal input voltage	48 V
JESD-30 code	R-PDSO-G8
JESD-609 code	e0
length	4.9 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	8
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Maximum output current	1 A
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Encapsulate equivalent code	SOP8,.25
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	255
Certification status	Not Qualified
Maximum seat height	1.75 mm
surface mount	YES
Switch configuration	BUCK
Maximum switching frequency	115 kHz
technology	BIPOLAR
Temperature level	INDUSTRIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	40
width	3.9 mm

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LT1676

Wide Input Range,

High Efficiency, Step-Down

Switching Regulator

FEATURES

DESCRIPTIO

Wide Input Range: 7.4V to 60V

700mA Peak Switch Current Rating

Adaptive Switch Drive Maintains Efficiency at High

Load Without Pulse Skipping at Light Load

True Current Mode Control

100kHz Fixed Operating Frequency

Synchronizable to 250kHz

Low Supply Current in Shutdown: 30µA

Available in 8-Pin SO and PDIP Packages

The LT

1676 is a wide input range, high efficiency Buck

(step-down) switching regulator. The monolithic die in-

cludes all oscillator, control and protection circuitry. The

part can accept input voltages as high as 60V and contains

an output switch rated at 700mA peak current. Current

mode control offers excellent dynamic input supply rejec-

tion and short-circuit protection.

The LT1676 contains several features to enhance effi-

ciency. The internal control circuitry is normally powered

via the V

pin, thereby minimizing power drawn directly

from the V

supply (see Applications Information). The

action of the LT1676 switch circuitry is also load depen-

dent. At medium to high loads, the output switch circuitry

maintains high rise time for good efficiency. At light loads,

rise time is deliberately reduced to avoid pulse skipping

behavior.

The available SO-8 package and 100kHz switching fre-

quency allow for minimal PC board area requirements.

, LTC and LT are registered trademarks of Linear Technology Corporation.

APPLICATIO S

Automotive DC/DC Converters

Telecom 48V Step-Down Converters

Cellular Phone Battery Charger Accessories

IEEE 1394 Step-Down Converters

TYPICAL APPLICATIO

8V TO 50V

SHDN

39µF

63V

LT1676

220µH*

MBR160

100µF

10V

EFFICIENCY (%)

400mA

36.5k

SYNC

2200pF

22k

100pF

12.1k

GND

*65T #30 ON MAGNETICS

MPP #55030

1676 F01

Figure 1

Efficiency vs V

and I

LOAD

40 V

= 12V

= 24V

= 36V

= 48V

LOAD

(mA)

1676 TA01

100

1000

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