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LTC3708

Features: ` Very Low Duty Factor Operation (tON(MIN) < 85ns)` No RSENSE TM Option for Maximum Efficiency` Very Fast Transient Response` Programmable Output Voltage Up/Down Tracking` 2-Phase Operation Reduces Input Capacitance` 0.6V ±1% Output Voltage Reference` External Frequency Synchronizatio...

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SeekIC No. : 004402304 Detail

LTC3708: Features: ` Very Low Duty Factor Operation (tON(MIN) < 85ns)` No RSENSE TM Option for Maximum Efficiency` Very Fast Transient Response` Programmable Output Voltage Up/Down Tracking` 2-Phase Opera...

LTC3708 Data Sheet

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Part Number:
LTC3708
Supply Ability:
5000

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  • 1~5000
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Total Cost: $ 0.00

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Product Details

Description



Features:

` Very Low Duty Factor Operation (tON(MIN) < 85ns)
` No RSENSE TM Option for Maximum Efficiency
` Very Fast Transient Response
` Programmable Output Voltage Up/Down Tracking
` 2-Phase Operation Reduces Input Capacitance
` 0.6V ±1% Output Voltage Reference
` External Frequency Synchronization
` Monotonic Soft-Start
` Onboard High Current MOSFET Drivers
` Wide VIN Range: Up to 36V
` Adjustable Cycle-by-Cycle Current Limit
` Instant Output Overvoltage Protection
` Optional Short-Circuit Shutdown Timer
` Power Good Output with 100s Masking
` Available in 5mm * 5mm QFN Package


Application

· Digital Signal Processors
· Network Servers


Pinout

Connection Diagram


Specifications

Input Supply Voltage (VCC, DRVCC) ............ 7V to 0.3V
Boosted Topside Driver Supply Voltage
(BOOST1, 2) ............................................. 42V to 0.3V
Switch Voltage (SW1, 2) ............................. 36V to 5V
SENSE1+, SENSE2+ Voltages ....................... 36V to 5V
SENSE1, SENSE2 Voltages ................... 10V to 0.3V
ION1, ION2 Voltages .................................. 21V to 0.3V
(BOOST SW) Voltages .............................7V to 0.3V
RUN/SS, PGOOD Voltages .......................... 7V to 0.3V
PGOOD DC Current ................................................ 5mA
TRACK1, TRACK2 Voltages ............ VCC + 0.3V to 0.3V
VRNG1, VRNG2 Voltages ................. VCC + 0.3V to 0.3V
ITH1, ITH2 Voltages ................................. 2.7V to 0.3V
VFB1, VFB2 Voltages................................. 2.7V to 0.3V
INTLPF, EXTLPF Voltages ........................ 2.7V to 0.3V
FCB Voltages .............................................. 7V to 0.3V
Operating Temperature Range (Note 5) 40°C to 85°C
Junction Temperature (Note 2) ........................... 125°C
Storage Temperature Range ............. 65°C to 125°C
Reflow Peak Body Temperature ........................... 260°C


Description

The LTC®3708 is a dual, 2-phase synchronous step-down switching regulator with output voltage up/down tracking capability. The IC allows either coincident or ratiometric tracking. Multiple LTC3708s can be daisy-chained in applications requiring more than two voltages to be tracked.Power supply sequencing is accomplished using an external  soft-start timing capacitor.

The LTC3708 uses a constant on-time, valley current mode control architecture to deliver very low duty factors without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in input supply voltage. An internal phase-locked loop allows the IC to be synchronized to an external clock.


Fault protection of LTC3708 is provided by an output overvoltage comparator and an optional short-circuit shutdown timer. The regulator current limit level is user programmable. A wide supply range allows voltages as high as 36V to be stepped down to 0.6V output.




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