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LTC1735

Features: Dual N-Channel MOSFET Synchronous Drive Synchronizable/Programmable Fixed Frequency Wide VIN Range: 3.5V to 36V Operation VOUT Range: 0.8V to 6V OPTI-LOOPTMCompensation Minimizes COUT ±1% Output Voltage Accuracy Internal Current Foldback Output Overvoltage Crowbar Protection Latched Sho...

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LTC1735: Features: Dual N-Channel MOSFET Synchronous Drive Synchronizable/Programmable Fixed Frequency Wide VIN Range: 3.5V to 36V Operation VOUT Range: 0.8V to 6V OPTI-LOOPTMCompensation Minimizes COUT ±1%...

LTC1735 Data Sheet

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Part Number:
LTC1735
Supply Ability:
5000

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  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

Dual N-Channel MOSFET Synchronous Drive
Synchronizable/Programmable Fixed Frequency
Wide VIN Range: 3.5V to 36V Operation
VOUT Range: 0.8V to 6V
OPTI-LOOPTMCompensation Minimizes COUT
±1% Output Voltage Accuracy
Internal Current Foldback
Output Overvoltage Crowbar Protection
Latched Short-Circuit Shutdown Timerwith Defeat Option
Very Low Dropout Operation: 99% Duty Cycle
Forced Continuous Control Pin
Optional Programmable Soft-Start
Remote Output Voltage Sense
Logic Controlled Micropower Shutdown: IQ < 25µA
LTC1435 Pin Compatible withMinor Component Changes
Available in 16-Lead Narrow SSOP and SO Packages


Application

Notebook and Palmtop Computers, PDAs
Cellular Telephones and Wireless Modems
DC Power Distribution Systems


Pinout

Connection Diagram


Specifications

Input Supply Voltage (VIN) .........................36V to 0.3V
Topside Driver Supply Voltage (BOOST) .....42V to 0.3V
Switch Voltage (SW) .....................................36V to 5V
EXTVCC Voltage ............................................7V to 0.3V
Boosted Driver Voltage (BOOST SW) ........7V to 0.3V
SENSE+, SENSE Voltages ......... 1.1 (INTVCC) to 0.3V
FCB Voltage ............................ (INTVCC + 0.3V) to 0.3V
ITH, VOSENSE
Voltages ....................................................2.7V to 0.3V
RUN/SS Voltages ..........................................7V to 0.3V
Peak Driver Output Current <10µs (TG, BG) .............. 3A
INTVCC Output Current ......................................... 50mA
Operating Ambient Temperature Range
LTC1735C ................................................. 0°C to 85°C
LTC1735I ............................................. 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


Description

The LTC®1735 is a synchronous step-down switchingregulator controller that drives external N-channel powerMOSFETs using a fixed frequency architecture. BurstModeTMoperation provides high efficiency at low loadcurrents. The precision 0.8V reference is compatible withfuture microprocessor generations. OPTI-LOOP compen-sation allows the transient response to be optimized overa wide range of output capacitance and ESR values.

The operating frequency of LTC1735 (synchronizable up to 500kHz) isset by an external capacitor allowing maximum flexibilityin optimizing efficiency. A forced continuous control pinreduces noise and RF interference and can assist second-ary winding regulation by disabling Burst Mode operationwhen the main output is lightly loaded.

Protection features include internal foldback current lim-iting, output overvoltage crowbar and optional short-circuit shutdown. Soft-start is provided by an externalcapacitor that can be used to properly sequence supplies.

The operating current level of LTC1735 is user-programmable via anexternal current sense resistor. Wide input supply rangeallows operation from 3.5V to 30V (36V maximum).




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