LTC1147LCS8#PBF datasheet, PDF

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LTC1147LCS8#PBF: DescriptionDC/DC Cntrlr Single-OUT Step Down 400kHz 8-Pin SOIC N Tube; File Size210KB，16 Pages; ManufacturerADI; Websitehttps://www.analog.com

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LTC1147LCS8#PBF Overview

DC/DC Cntrlr Single-OUT Step Down 400kHz 8-Pin SOIC N Tube

LTC1147LCS8#PBF Parametric

Parameter Name	Attribute value
EU restricts the use of certain hazardous substances	Compliant
ECCN (US)	EAR99
Part Status	Active
HTS	8542.39.00.01
Number of Outputs	1
Topology	Step Down
Maximum Output Current (A)	0.05
Maximum Switching Frequency (kHz)	400
Minimum Input Voltage (V)	3.5
Maximum Input Voltage (V)	16
Operating Supply Voltage (V)	3.5 to 16
Maximum Supply Current (mA)	2.1
Synchronous Rectifier	Yes
Synchronous Clock	No
Programmability	Yes
Minimum Operating Temperature (°C)	0
Maximum Operating Temperature (°C)	70
Supplier Temperature Grade	Commercial
Packaging	Tube
Pin Count	8
Standard Package Name	SOP
Supplier Package	SOIC N
Mounting	Surface Mount
Package Height	1.5(Max)
Package Length	5(Max)
Package Width	3.99(Max)
PCB changed	8
Lead Shape	Gull-wing

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LTC1147-3.3

LTC1147-5/LTC1147L

High Efficiency Step-Down

Switching Regulator Controllers

FEATURES

DESCRIPTIO

Very High Efficiency: Over 95% Possible

Wide V

Range: 3.5V* to 16V

Current Mode Operation for Excellent Line and Load

Transient Response

High Efficiency Maintained Over Three Decades of

Output Current

Low 160µA Standby Current at Light Loads

Logic Controlled Micropower Shutdown: I

< 20µA

Short-Circuit Protection

Very Low Dropout Operation: 100% Duty Cycle

High Efficiency in a Small Amount of Board Space

Output Can Be Externally Held High in Shutdown

Available in 8-Pin SO Package

The LTC

1147 series are step-down switching regulator

controllers featuring automatic Burst Mode

operation to

maintain high efficiencies at low output currents. These

devices drive an external P-channel power MOSFET at

switching frequencies exceeding 400kHz using a constant

off-time current mode architecture providing constant

ripple current in the inductor.

The operating current level is user-programmable via an

external current sense resistor. Wide input supply range

allows operation from 3.5V* to 14V (16V maximum).

Constant off-time architecture provides low dropout regu-

lation limited by only the R

DS(ON)

of the external MOSFET

and resistance of the inductor and current sense resistor.

The LTC1147 series incorporates automatic power saving

Burst Mode operation to reduce switching losses when

load currents drop below the level required for continuous

operation. Standby power is reduced to only 2mW at

= 10V (at I

OUT

= 0). Load currents in Burst Mode

operation are typically 0mA to 300mA.

For applications where even higher efficiency is required,

refer to the LTC1148 data sheet and Application Note 54.

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

Burst Mode is a trademark of Linear Technology Corporation.

*LTC1147L and LTC1147L-3.3 only.

APPLICATIO S

Notebook and Palmtop Computers

Portable Instruments

Battery-Operated Digital Devices

Cellular Telephones

DC Power Distribution Systems

GPS Systems

TYPICAL APPLICATI

1µF

(5.2V TO 14V)

PDRIVE

LTC1147-5

SHDN

SENSE

–

GND

P-CHANNEL

Si4431DY

50µH

100

100µF

SENSE

0.05Ω

0V = NORMAL

>1.5V = SHUTDOWN

OUT

5V/2A

EFFICIENCY (%)

1000pF

3300pF

MBRD330

470pF

OUT

390µF

LT1147 • F01

*COILTRONICS CTX50-2-MP

**KRL SL-1-C1-0R050J

Figure 1. High Efficiency Step-Down Converter

sn1147 1147fds

LTC1147-5 Efficiency

= 10V

0.001

= 6V

0.01

0.1

LT1147 • TA01

LOAD CURRENT (A)

LTC1147LCS8#PBF Related Products

	LTC1147LCS8#PBF	LTC1147CN8-5	LTC1147CS8-3.3	LTC1147CS8-5#PBF	LTC1147CS8-5#TRPBF	LTC1147CS8-5	LTC1147LCS8#TRPBF	LTC1147LCS8	LTC1147LIS8#PBF	LTC1147LIS8#TRPBF
Description	DC/DC Cntrlr Single-OUT Step Down 400kHz 8-Pin SOIC N Tube	DC/DC Cntrlr Single-OUT Step Down 400kHz 8-Pin PDIP N	DC/DC Cntrlr Single-OUT Step Down 400kHz 8-Pin SOIC N	DC/DC Cntrlr Single-OUT Step Down 400kHz 8-Pin SOIC N Tube	DC/DC Cntrlr Single-OUT Step Down 400kHz 8-Pin SOIC N T/R	DC/DC Cntrlr Single-OUT Step Down 400kHz 8-Pin SOIC N	DC/DC Cntrlr Single-OUT Step Down 400kHz 8-Pin SOIC N T/R	DC/DC Cntrlr Single-OUT Step Down 400kHz 8-Pin SOIC N	DC/DC Cntrlr Single-OUT Step Down 400kHz 8-Pin SOIC N Tube	DC/DC Cntrlr Single-OUT Step Down 400kHz 8-Pin SOIC N T/R
EU restricts the use of certain hazardous substances	Compliant	Not Compliant	Not Compliant	Compliant	Compliant	Not Compliant	Compliant	Not Compliant	Compliant	Compliant
ECCN (US)	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Part Status	Active	Unconfirmed	Unconfirmed	Active	Active	Unconfirmed	Active	Unconfirmed	Active	Active
Number of Outputs	1	1	1	1	1	1	1	1	1	1
Topology	Step Down	Step Down	Step Down	Step Down	Step Down	Step Down	Step Down	Step Down	Step Down	Step Down
Maximum Output Current (A)	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05
Maximum Switching Frequency (kHz)	400	400	400	400	400	400	400	400	400	400
Minimum Input Voltage (V)	3.5	3.5	3.5	3.5	3.5	3.5	3.5	3.5	3.5	3.5
Maximum Input Voltage (V)	16	16	16	16	16	16	16	16	16	16
Operating Supply Voltage (V)	3.5 to 16	3.5 to 16	3.5 to 16	3.5 to 16	3.5 to 16	3.5 to 16	3.5 to 16	3.5 to 16	3.5 to 16	3.5 to 16
Maximum Supply Current (mA)	2.1	2.1	2.1	2.1	2.1	2.1	2.1	2.1	2.1	2.1
Synchronous Rectifier	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Synchronous Clock	No	No	No	No	No	No	No	No	No	No
Programmability	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Maximum Operating Temperature (°C)	70	70	70	70	70	70	70	70	85	85
Supplier Temperature Grade	Commercial	Commercial	Commercial	Commercial	Commercial	Commercial	Commercial	Commercial	Industrial	Industrial
Pin Count	8	8	8	8	8	8	8	8	8	8
Standard Package Name	SOP	DIP	SOP	SOP	SOP	SOP	SOP	SOP	SOP	SOP
Supplier Package	SOIC N	PDIP N	SOIC N	SOIC N	SOIC N	SOIC N	SOIC N	SOIC N	SOIC N	SOIC N
Mounting	Surface Mount	Through Hole	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package Height	1.5(Max)	3.3	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	5(Max)	10.16(Max)	5(Max)	5(Max)	5(Max)	5(Max)	5(Max)	5(Max)	5(Max)	5(Max)
Package Width	3.99(Max)	6.48	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	8	8	8	8	8	8	8	8	8	8
Lead Shape	Gull-wing	Through Hole	Gull-wing	Gull-wing	Gull-wing	Gull-wing	Gull-wing	Gull-wing	Gull-wing	Gull-wing
HTS	8542.39.00.01	8542.39.00.01	-	8542.39.00.01	8542.39.00.01	-	8542.39.00.01	-	8542.39.00.01	8542.39.00.01

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