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LTC1709

Features: ` Two Ouput Stages Operate Antiphase Reducing Input Capacitance and Power Supply Noise` 5-Bit VID Control (VRM 8.4 Compliant) VOUT: 1.3V to 3.5V in 50mV/100mV Steps` Current Mode Control Ensures Current Sharing`True Remote Sensing Differential Amplifier` OPTI-LOOPTM Compensation Minimize...

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SeekIC No. : 004401831 Detail

LTC1709: Features: ` Two Ouput Stages Operate Antiphase Reducing Input Capacitance and Power Supply Noise` 5-Bit VID Control (VRM 8.4 Compliant) VOUT: 1.3V to 3.5V in 50mV/100mV Steps` Current Mode Control E...

LTC1709 Data Sheet

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Part Number:
LTC1709
Supply Ability:
5000

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

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Product Details

Description



Features:

` Two Ouput Stages Operate Antiphase Reducing Input Capacitance and Power Supply Noise
` 5-Bit VID Control (VRM 8.4 Compliant) VOUT: 1.3V to 3.5V in 50mV/100mV Steps
` Current Mode Control Ensures Current Sharing
`True Remote Sensing Differential Amplifier
` OPTI-LOOPTM Compensation Minimizes COUT
` Programmable Fixed Frequency: 150kHz to 300kHz-Effective 300kHz to 600kHz Switching Frequency
` ±1% Output Voltage Accuracy
` Wide VIN Range: 4V to 36V Operation
` Adjustable Soft-Start Current Ramping
` Internal Current Foldback
` Short-Circuit Shutdown Timer with Defeat Option
` Overvoltage Soft-Latch Eliminates Nuisance Trips
` Low Shutdown Current: 20A
` Small 36-Lead Narrow (0.209") SSOP Package


Application

· Desktop Computers
·Internet/Network Servers
· Large Memory Arrays
· DC Power Distribution Systems
· Battery Chargers


Pinout

Connection Diagram


Specifications

Input Supply Voltage (VIN).............................36V to 0.3V
Topside Driver Voltages (BOOST 1, 2) ...........42V to 0.3V
Switch Voltage (SW1, 2) .................................36V to 5 V
SENSE 1+, SENSE 2 +, SENSE 1,
SENSE 2 Voltages......................... (1.1)INTVCC to 0.3V
EAIN, VOS +, VOS , EXTVCC, INTVCC, RUN/SS,
AMPMD, VBIAS, ATTENIN, ATTENOUT,
VID0VID4, Voltages .....................................7V to 0.3V
Boosted Driver Voltage (BOOST-SW) .............7V to 0.3V
PLLFLTR, PLLIN, VDIFFOUT Voltages ....... INTVCC to 0.3V
ITH Voltage .................................................2.7V to 0.3V
Peak Output Current <1s(TGL1, 2; BG1, 2) ................ 3A
INTVCC RMS Output Current ................................... 50mA
Operating Ambient Temperature Range
(Note 2) ..................................................... 40 to 85
Junction Temperature (Note 3) ................................ 125
Storage Temperature Range .................... 65 to 150
Lead Temperature (Soldering, 10 sec)...................... 300



Description

The LTC®1709 is a 2-phase, VID programmable, synchronous step-down switching regulator controller that drives all N-channel external power MOSFET stages in a fixed frequency architecture. The 2-phase controller drives its two output stages out of phase at frequencies up to 300kHz to minimize the RMS ripple currents in both input and output capacitors. The 2-phase technique effectively multiplies the fundamental frequency by two, improving transient response while operating each channel at a optimum frequency for efficiency. Thermal design is also simplified.

An internal differential amplifier of LTC1709 provides true remote sensing of the regulated supply's positive and negative output terminals as required in high current applications.

The RUN/SS pin of LTC1709 provides soft-start and optional timed, short-circuit shutdown. Current foldback limits MOSFET dissipaton during short-circuit conditions when overcurrent latchoff is disabled. OPTI-LOOP compensation allows the
transient response to be optimized for a wide range of output capacitors and ESR values.




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