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LTC1437AIG, LTC1437CG, LTC1438

Table of contents:
Info of LTC1437AIG
Info of LTC1437CG
Info of LTC1438

LTC1437AIG, LTC1437CG, LTC1438 Selling Leads, Datasheet

MFG:Linear Technology Category:Integrated Circuits (ICs) Package Cooled:SSOP-28 D/C:SSOP

LTC1437AIG, LTC1437CG, LTC1438 Datasheet download

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Part Number: LTC1437AIG

Category: Integrated Circuits (ICs)

MFG: Linear Technology

Package Cooled: SSOP-28

D/C: SSOP

Description: IC SW REG SYNC STEP-DOWN 28-SSOP

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LTC1437AIG Parameters

Technical/Catalog Information	LTC1437AIG
Vendor	Linear Technology
Category	Integrated Circuits (ICs)
Type	Step-Down (Buck)
Number of Outputs	1
Voltage - Input	3.5 ~ 30 V
Voltage - Output	1.19 ~ 9 V
Current - Output	50mA
Power - Output	-
Package / Case	28-SSOP
Packaging	Tube
Internal Switch(s)	No
Synchronous	Yes
Rds (On)	-
Operating Temperature	-40°C ~ 85°C
Frequency - Switching	125kHz ~ 240kHz
Drawing Number	161; 05-08-1640; G; 16
Lead Free Status	Contains Lead
RoHS Status	RoHS Non-Compliant
Other Names	LTC1437AIG LTC1437AIG

LTC1437CG Parameters

Technical/Catalog Information	LTC1437CG
Vendor	Linear Technology
Category	Integrated Circuits (ICs)
Type	Step-Down (Buck)
Number of Outputs	1
Voltage - Input	3.5 ~ 30 V
Voltage - Output	1.19 ~ 9 V
Current - Output	50mA
Power - Output	-
Package / Case	28-SSOP
Packaging	Tube
Internal Switch(s)	No
Synchronous	Yes
Rds (On)	-
Operating Temperature	0°C ~ 70°C
Frequency - Switching	125kHz ~ 240kHz
Drawing Number	161; 05-08-1640; G; 16
Lead Free Status	Contains Lead
RoHS Status	RoHS Non-Compliant
Other Names	LTC1437CG LTC1437CG

LTC1438 General Description

The LTC®1438/LTC1439 are dual, synchronous stepdown switching regulator controllers which drive external N-channel power MOSFETs in a phase-lockable fixed frequency architecture. The Adaptive PowerTM output stage selectively drives two N-channel MOSFETs at frequencies up to 400kHz while reducing switching losses to maintain high efficiencies at low output currents.

An auxiliary 0.5A linear regulator using an external PNP pass device provides a low noise, low dropout voltage source. A secondary winding feedback control pin (SFB1) guarantees regulation regardless of load on the main output by forcing continuous operation.

An additional comparator is available for use as a low battery detector. A power-on reset timer (POR) is included which generates a signal delayed by 65536/fCLK (typ 300ms) after the output is within 5% of the regulated output voltage. Internal resistive dividers provide pin selectable output voltages with remote sense capability on one of the two outputs.

The operating current levels are user-programmable via external current sense resistors. Wide input supply range allows operation from 3.5V to 30V (36V maximum).

LTC1438 Maximum Ratings

Input Supply Voltage (VIN)......................... 36V to 0.3V
Topside Driver Voltage (BOOST 1, 2) ......... 42V to 0.3V
Switch Voltage (SW1, 2)....................... VIN + 5V to 5V
EXTVCC Voltage......................................... 10V to 0.3V
POR2, LBO Voltages .................................. 12V to 0.3V
AUXFB Voltage .......................................... 20V to 0.3V
AUXDR Voltage.......................................... 28V to 0.3V
SENSE+ 1, SENSE+ 2, SENSE 1, SENSE 2,
VOSENSE2 Voltages ................ INTVCC + 0.3V to 0.3V
VPROG1, VPROG2 Voltages ................ INTVCC to 0.3V
PLL LPF, ITH1, ITH2 Voltages .................. 2.7V to 0.3V
AUXON, PLLIN, SFB1,
RUN/SS1, RUN/SS2, LBI Voltages ............. 10V to 0.3V
Peak Output Current < 10ms (TGL1, 2, BG1, 2)......... 2A
Peak Output Current < 10ms (TGS1, 2) .............. 250mA
INTVCC Output Current ........................................ 50mA
Operating Ambient Temperature Range
Commercial .............................................. 0°C to 70°C
Industrial ............................................ 40°C to 85°C
Junction Temperature (Note 1) ........................... 125°C
Storage Temperature Range ............. 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C

LTC1438 Features

· Maintains Constant Frequency at Low Output Currents
· Dual N-Channel MOSFET Synchronous Drive
· Programmable Fixed Frequency (PLL Lockable)
· Wide VIN Range: 3.5V to 36V Operation
· Ultrahigh Efficiency
· Very Low Dropout Operation: 99% Duty Cycle
· Low Dropout, 0.5A Linear Regulator for VPP Generation or Low Noise Audio Supply
·Built-In Power-On Reset Timer
· Programmable Soft Start
· Low-Battery Detector
· Remote Output Voltage Sense
· Foldback Current Limiting (Optional)
· Pin Selectable Output Voltage
· Logic-Controlled Micropower Shutdown: IQ < 30mA
· Output Voltages from 1.19V to 9V
· Available in 28- and 36-Lead SSOP Packages

LTC1438 Typical Application

· Notebook and Palmtop Computers, PDAs
· Portable Instruments
· Battery-Operated Devices
· DC Power Distribution Systems

LTC1438 Connection Diagram

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