LTC1778EGN-1 datasheet, PDF - EEWORLD Datasheet

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LTC1778EGN-1: Description2 A SWITCHING CONTROLLER, PDSO16; CategoryPower/power management The power supply circuit; File Size260KB，24 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LTC1778EGN-1 Overview

2 A SWITCHING CONTROLLER, PDSO16

LTC1778EGN-1 Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	incompatible
Maker	Linear ( ADI )
Parts packaging code	SSOP
package instruction	SSOP, SSOP16,.25
Contacts	16
Manufacturer packaging code	GN
Reach Compliance Code	not_compliant
ECCN code	EAR99
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER
control mode	CURRENT-MODE
Maximum input voltage	36 V
Minimum input voltage	4 V
Nominal input voltage	15 V
JESD-30 code	R-PDSO-G16
JESD-609 code	e0
length	4.8895 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	16
Maximum operating temperature	70 °C
Minimum operating temperature
Maximum output current	2 A
Package body material	PLASTIC/EPOXY
encapsulated code	SSOP
Encapsulate equivalent code	SSOP16,.25
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	235
Certification status	Not Qualified
Maximum seat height	1.75 mm
surface mount	YES
Switch configuration	PUSH-PULL
technology	CMOS
Temperature level	COMMERCIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	GULL WING
Terminal pitch	0.635 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	20
width	3.899 mm

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LTC1778/LTC1778-1

Wide Operating Range,

No R

SENSE

Step-Down Controller

FEATURES

■

DESCRIPTIO

No Sense Resistor Required

True Current Mode Control

Optimized for High Step-Down Ratios

ON(MIN)

≤

100ns

Extremely Fast Transient Response

Stable with Ceramic C

OUT

Dual N-Channel MOSFET Synchronous Drive

Power Good Output Voltage Monitor (LTC1778)

Adjustable On-Time (LTC1778-1)

Wide V

Range: 4V to 36V

±1%

0.8V Voltage Reference

Adjustable Current Limit

Adjustable Switching Frequency

Programmable Soft-Start

Output Overvoltage Protection

Optional Short-Circuit Shutdown Timer

Micropower Shutdown: I

< 30µA

Available in a 16-Pin Narrow SSOP Package

The LTC

1778 is a synchronous step-down switching

regulator controller optimized for CPU power. The con-

troller uses a valley current control architecture to deliver

very low duty cycles with excellent transient response

without requiring a sense resistor. Operating frequency is

selected by an external resistor and is compensated for

variations in V

Discontinuous mode operation provides high efficiency

operation at light loads. A forced continuous control pin

reduces noise and RF interference, and can assist second-

ary winding regulation by disabling discontinuous opera-

tion when the main output is lightly loaded.

Fault protection is provided by internal foldback current

limiting, an output overvoltage comparator and optional

short-circuit shutdown timer. Soft-start capability for sup-

ply sequencing is accomplished using an external timing

capacitor. The regulator current limit level is user program-

mable. Wide supply range allows operation from 4V to 36V

at the input and from 0.8V up to (0.9)V

at the output.

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

No R

SENSE

is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Protected by U.S. Patents, including 5481178, 6100678, 6580258, 5847554, 6304066

APPLICATIO S

■

Notebook and Palmtop Computers

Distributed Power Systems

TYPICAL APPLICATIO

1.4MΩ

0.1µF

RUN/SS

500pF

20k

SGND

LTC1778

INTV

BOOST

Si4884

0.22µF

CMDSH-3

Si4874

VCC

4.7µF

1.8µH

EFFICIENCY (%)

10µF

50V

×3

5V TO 28V

B340A

30.1k

OUT

180µF

×2

OUT

2.5V

10A

PGOOD

PGND

14k

1778 F01a

Figure 1. High Efficiency Step-Down Converter

1778fb

Efficiency vs Load Current

100

OUT

= 2.5V

= 5V

= 25V

0.01

0.1

LOAD CURRENT (A)

1778 F01b

LTC1778EGN-1 Related Products

	LTC1778EGN-1	LTC1778EGN	LTC1778IGN	LTR3800
Description	2 A SWITCHING CONTROLLER, PDSO16	2 A SWITCHING CONTROLLER, PDSO16	2 A SWITCHING CONTROLLER, PDSO16	2 A SWITCHING CONTROLLER, PDSO16
control mode	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	PEAK CURRENT
Number of functions	1	1	1	1
Number of terminals	16	16	16	16
Maximum operating temperature	70 °C	70 °C	125 °C	70 Cel
Maximum output current	2 A	2 A	2 A	2 A
surface mount	YES	YES	YES	Yes
Switch configuration	PUSH-PULL	PUSH-PULL	PUSH-PULL	PUSH-PULL
Temperature level	COMMERCIAL	COMMERCIAL	AUTOMOTIVE	COMMERCIAL
Terminal form	GULL WING	GULL WING	GULL WING	GULL WING
Terminal location	DUAL	DUAL	DUAL	DUAL
Brand Name	Linear Technology	Linear Technology	Linear Technology	-
Is it Rohs certified?	incompatible	incompatible	incompatible	-
Maker	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	-
Parts packaging code	SSOP	SSOP	SSOP	-
package instruction	SSOP, SSOP16,.25	0.150 INCH, PLASTIC, SSOP-16	SSOP, SSOP16,.25	-
Contacts	16	16	16	-
Manufacturer packaging code	GN	GN	GN	-
Reach Compliance Code	not_compliant	_compli	not_compliant	-
ECCN code	EAR99	EAR99	EAR99	-
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER	-
Maximum input voltage	36 V	36 V	36 V	-
Minimum input voltage	4 V	4 V	4 V	-
Nominal input voltage	15 V	15 V	15 V	-
JESD-30 code	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16	-
JESD-609 code	e0	e0	e0	-
length	4.8895 mm	4.8895 mm	4.8895 mm	-
Humidity sensitivity level	1	1	1	-
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	235	235	-
Certification status	Not Qualified	Not Qualified	Not Qualified	-
Maximum seat height	1.75 mm	1.75 mm	1.75 mm	-
technology	CMOS	CMOS	CMOS	-
Terminal surface	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	-
Terminal pitch	0.635 mm	0.635 mm	0.635 mm	-
Maximum time at peak reflow temperature	20	20	20	-
width	3.899 mm	3.899 mm	3.899 mm	-

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