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LTC1148, LTC1148CN, LTC1148CN-5

Table of contents:
Info of LTC1148
Info of LTC1148CN
Info of LTC1148CN-5

LTC1148, LTC1148CN, LTC1148CN-5 Selling Leads, Datasheet

MFG:Linear Technology Category:Integrated Circuits (ICs) Package Cooled:SOP D/C:09+

LTC1148, LTC1148CN, LTC1148CN-5 Datasheet download

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Part Number: LTC1148CN

Category: Integrated Circuits (ICs)

MFG: Linear Technology

Package Cooled: SOP

D/C: 09+

Description: IC SW REG STEP-DOWN 5V 14-DIP

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LTC1148 General Description

The LTC^®1148 series is a family of synchronous stepdown switching regulator controllers featuring automatic Burst ModeTM operation to maintain high efficiencies at
low output currents. These devices drive external complementary power MOSFETs at switching frequencies up to 250kHz 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 18V (20V maximum).
Constant off-time architecture provides low dropout regulation limited by only the RDS(ON) of the external MOSFET and resistance of the inductor and current sense resistor.

The LTC1148 series combines synchronous switching for maximum efficiency at high currents with an automatic low current operating mode, called Burst Mode operation, which reduces switching losses. Standby power is reduced to only 2mW at VIN = 10V (at IOUT = 0). Load currents in Burst Mode operation are typically 0mA to 300mA.

For operation up to 48V input, see the LTC1149 and LTC1159 data sheets and Application Note 54.

LTC1148 Maximum Ratings

Input Supply Voltage (Pin 3)
LTC1148 and LTC1148L Series ..................... 16V to 0.3V
LTC1148HV Series ........................................ 20V to 0.3V
Continuous Output Current (Pins 1, 14) .................... 50mA
Sense Voltages (Pins 7, 8)
LTC1148HV (Adjustable Only)
VIN ³ 12.7V .................................................. 13V to 0.3V
VIN < 12.7V ..................................... (VIN + 0.3V) to 0.3V
Operating Ambient Temperature Range ........ 0°C to 70°C
Extended Commercial
Temperature Range ................................ 40°C to 85°C
Junction Temperature (Note 2) ............................... 125°C
Storage Temperature Range ................ 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C

LTC1148 Features

· Ultrahigh Efficiency: Over 95% Possible
· Current-Mode Operation for Excellent Line and Load Transient Response
· High Efficiency Maintained Over Three Decades of Output Current
· Low 160mA Standby Current at Light Loads
· Logic Controlled Micropower Shutdown: IQ < 20mA
· Wide VIN Range: 3.5V* to 20V
·Short-Circuit Protection
· Very Low Dropout Operation: 100% Duty Cycle
· Synchronous FET Switching for High Efficiency
· Adaptive Nonoverlap Gate Drives
· Output Can Be Externally Held High in Shutdown
·Available in 14-Pin Narrow SO Package

LTC1148 Typical Application

· Notebook and Palmtop Computers
· Portable Instruments
· Battery-Operated Digital Devices
· Cellular Telephones
· DC Power Distribution Systems
· GPS Systems

LTC1148 Connection Diagram

LTC1148CN Parameters

Technical/Catalog Information	LTC1148CN
Vendor	Linear Technology
Category	Integrated Circuits (ICs)
Type	Step-Down (Buck)
Number of Outputs	1
Voltage - Input	3.5 ~ 20 V
Voltage - Output	Adjustable
Current - Output	50mA
Power - Output	-
Package / Case	14-DIP (300 mil)
Packaging	Tube
Internal Switch(s)	No
Synchronous	Yes
Rds (On)	-
Operating Temperature	0°C ~ 70°C
Frequency - Switching	250kHz
Drawing Number	161; 05-08-1510; N; 8
Lead Free Status	Contains Lead
RoHS Status	RoHS Non-Compliant
Other Names	LTC1148CN LTC1148CN

LTC1148CN-5 Parameters

Technical/Catalog Information	LTC1148CN-5
Vendor	Linear Technology
Category	Integrated Circuits (ICs)
Type	Step-Down (Buck)
Number of Outputs	1
Voltage - Input	3.5 ~ 20 V
Voltage - Output	5V
Current - Output	50mA
Power - Output	-
Package / Case	14-DIP (300 mil)
Packaging	Tube
Internal Switch(s)	No
Synchronous	Yes
Rds (On)	-
Operating Temperature	0°C ~ 70°C
Frequency - Switching	250kHz
Drawing Number	161; 05-08-1510; N; 8
Lead Free Status	Contains Lead
RoHS Status	RoHS Non-Compliant
Other Names	LTC1148CN 5 LTC1148CN5

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