LT1777CS#TR datasheet, PDF - EEWORLD Datasheet

LT1777CS#TR: DescriptionConv DC-DC 6.7V to 48V Synchronous Step Down Single-Out 1.24V to 40.8V 0.7A Automotive 16-Pin SOIC N T/R; File Size278KB，24 Pages; ManufacturerADI; Websitehttps://www.analog.com

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LT1777CS#TR Overview

Conv DC-DC 6.7V to 48V Synchronous Step Down Single-Out 1.24V to 40.8V 0.7A Automotive 16-Pin SOIC N T/R

LT1777CS#TR Parametric

Parameter Name	Attribute value
EU restricts the use of certain hazardous substances	Not Compliant
ECCN (US)	EAR99
Part Status	Unconfirmed
SVHC	Yes
SVHC Exceeds Threshold	Yes
Type	Synchronous Step Down
Output Type	Adjustable
Switching Frequency (kHz)	110
Switching Regulator	Yes
Number of Outputs	1
Output Voltage (V)	1.24 to 40.8
Maximum Output Current (A)	0.7
Minimum Input Voltage (V)	6.7
Maximum Input Voltage (V)	48
Operating Supply Voltage (V)	6.7 to 48
Line Regulation	0.01%/V
Minimum Operating Temperature (°C)	0
Maximum Operating Temperature (°C)	125
Supplier Temperature Grade	Commercial
Packaging	Tape and Reel
Pin Count	16
Standard Package Name	SOP
Supplier Package	SOIC N
Mounting	Surface Mount
Package Height	1.5(Max)
Package Length	10.01(Max)
Package Width	3.99(Max)
PCB changed	16
Lead Shape	Gull-wing

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LT1777

Low Noise Step-Down

Switching Regulator

FEATURES

DESCRIPTIO

Programmable dI/dt Limit

Internally Limited dV/dt

High Input Voltage: 48V Max

700mA Peak Switch Rating

True Current Mode Control

100kHz Fixed Operating Frequency

Synchronizable to 250kHz

Low Supply Current in Shutdown: 30µA

Low Thermal Resistance 16-Pin SO Package

The LT

1777 is a Buck (step-down) regulator designed for

noise sensitive applications. It contains a dI/dt limiting

circuit programmed via a small external inductor in the

switching path. Internal circuitry also generates controlled

dV/dt ramp rates.

The monolithic die includes all oscillator, control and

protection circuitry. The part can accept operating input

voltages as high as 48V, and contains an output switch

rated at 700mA peak current. Current mode control offers

excellent dynamic input supply rejection and short-circuit

protection. The internal control circuitry is normally pow-

ered via the V

pin, thereby minimizing power drawn

directly from the V

supply (see Applications Informa-

tion). The fused-lead SO16 package and 100kHz switch-

ing frequency allow for minimal PC board area

requirements.

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

APPLICATIO S

Automotive Cellular and GPS Receivers

Telecom Power Supplies

Industrial Instrument Power Supplies

TYPICAL APPLICATIO

Low Noise 5V Step-Down Supply

24V

39µF

63V

100pF

100pF 12k

SGND

2200pF

12.1k

1777 TA01

SHDN

LT1777

SYNC

1µH*

MBRS1100

220µH

OUT

400mA

100µF

10V

36.5k

VOLTAGE

10V/DIV

CURRENT

200mA/DIV

1777 TA02

*PROGRAMS dI/dT

Switching Waveforms

500ns/DIV

LT1777CS#TR Related Products

	LT1777CS#TR	LT1777CS#PBF	LT1777CS#TRPBF	LT1777CS	LT1777IS#PBF	LT1777IS#TR	LT1777IS#TRPBF	LT1777IS
Description	Conv DC-DC 6.7V to 48V Synchronous Step Down Single-Out 1.24V to 40.8V 0.7A Automotive 16-Pin SOIC N T/R	Conv DC-DC 6.7V to 48V Synchronous Step Down Single-Out 1.24V to 40.8V 0.7A Automotive 16-Pin SOIC N Tube	Conv DC-DC 6.7V to 48V Synchronous Step Down Single-Out 1.24V to 40.8V 0.7A Automotive 16-Pin SOIC N T/R	Conv DC-DC 6.7V to 48V Synchronous Step Down Single-Out 1.24V to 40.8V 0.7A Automotive 16-Pin SOIC N	Conv DC-DC 6.7V to 48V Synchronous Step Down Single-Out 1.24V to 40.8V 0.7A Automotive 16-Pin SOIC N Tube	Conv DC-DC 6.7V to 48V Synchronous Step Down Single-Out 1.24V to 40.8V 0.7A Automotive 16-Pin SOIC N T/R	Conv DC-DC 6.7V to 48V Synchronous Step Down Single-Out 1.24V to 40.8V 0.7A Automotive 16-Pin SOIC N T/R	Conv DC-DC 6.7V to 48V Synchronous Step Down Single-Out 1.24V to 40.8V 0.7A Automotive 16-Pin SOIC N
EU restricts the use of certain hazardous substances	Not Compliant	Compliant	Compliant	Not Compliant	Compliant	Not Compliant	Compliant	Not Compliant
ECCN (US)	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Part Status	Unconfirmed	Active	Active	Unconfirmed	Active	Unconfirmed	Active	Unconfirmed
Type	Synchronous Step Down	Synchronous Step Down	Synchronous Step Down	Synchronous Step Down	Synchronous Step Down	Synchronous Step Down	Synchronous Step Down	Synchronous Step Down
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Switching Frequency (kHz)	110	110	110	110	110	110	110	110
Switching Regulator	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Number of Outputs	1	1	1	1	1	1	1	1
Output Voltage (V)	1.24 to 40.8	1.24 to 40.8	1.24 to 40.8	1.24 to 40.8	1.24 to 40.8	1.24 to 40.8	1.24 to 40.8	1.24 to 40.8
Maximum Output Current (A)	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7
Minimum Input Voltage (V)	6.7	6.7	6.7	6.7	6.7	6.7	6.7	6.7
Maximum Input Voltage (V)	48	48	48	48	48	48	48	48
Operating Supply Voltage (V)	6.7 to 48	6.7 to 48	6.7 to 48	6.7 to 48	6.7 to 48	6.7 to 48	6.7 to 48	6.7 to 48
Line Regulation	0.01%/V	0.01%/V	0.01%/V	0.01%/V	0.01%/V	0.01%/V	0.01%/V	0.01%/V
Maximum Operating Temperature (°C)	125	125	125	125	125	125	125	125
Supplier Temperature Grade	Commercial	Commercial	Commercial	Commercial	Industrial	Industrial	Industrial	Industrial
Pin Count	16	16	16	16	16	16	16	16
Standard Package Name	SOP	SOP	SOP	SOP	SOP	SOP	SOP	SOP
Supplier Package	SOIC N	SOIC N	SOIC N	SOIC N	SOIC N	SOIC N	SOIC N	SOIC N
Mounting	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package Height	1.5(Max)	1.5(Max)	1.5(Max)	1.5(Max)	1.5(Max)	1.5(Max)	1.5(Max)	1.5(Max)
Package Length	10.01(Max)	10.01(Max)	10.01(Max)	10.01(Max)	10.01(Max)	10.01(Max)	10.01(Max)	10.01(Max)
Package Width	3.99(Max)	3.99(Max)	3.99(Max)	3.99(Max)	3.99(Max)	3.99(Max)	3.99(Max)	3.99(Max)
PCB changed	16	16	16	16	16	16	16	16
Lead Shape	Gull-wing	Gull-wing	Gull-wing	Gull-wing	Gull-wing	Gull-wing	Gull-wing	Gull-wing
Packaging	Tape and Reel	Tube	Tape and Reel	-	Tube	Tape and Reel	Tape and Reel	-
HTS	-	8542.39.00.01	8542.39.00.01	-	8542.39.00.01	-	8542.39.00.01	8542.39.00.01

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