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LTC3708EUHTRPBF, LTC3709, LTC3709EG

Table of contents:
Info of LTC3708EUHTRPBF
Info of LTC3709
Info of LTC3709EG

LTC3708EUHTRPBF, LTC3709, LTC3709EG Selling Leads, Datasheet

MFG:LT Package Cooled:QFN32 D/C:2006

LTC3708EUHTRPBF, LTC3709, LTC3709EG Picture

LTC3708EUHTRPBF, LTC3709, LTC3709EG Datasheet download

Five Points

Part Number: LTC3708EUHTRPBF

MFG: LT

Package Cooled: QFN32

D/C: 2006

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LTC3709 General Description

The LTC^®3709 is a single output, dual phase, synchronous step-down switching regulator. The controller uses a constant on-time, valley current control architecture to deliver very low duty cycles 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-lock loop allows the LTC3709 to be synchronized to an external clock.

A TRACK pin is provided for tracking or sequencing the output voltage among several LTC3709 chips or an LTC3709 and other DC/DC regulators. Soft-start is accomplished using an external timing capacitor.

Fault protection is provided by an output overvoltage comparator and an optional short-circuit shutdown timer. The current limit level is user programmable. A wide supply range allows voltages as high as 31V to step down as low as 0.6V.

LTC3709 Maximum Ratings

Input Supply Voltage (V_CC, DRV_CC) .......... 7V to 0.3V
Boosted Topside Driver Supply Voltage
(BOOST1, BOOST2) .................................. 37V to 0.3V
Switch Voltage (SW1, 2) ............................. 31V to 1V
SENSE1^+, SENSE2⁺ Voltages ...................... 31V to 1V
SENSE1^, SENSE2 Voltages .................. 10V to 0.3V
I_ON Voltage ............................................. 31V to 0.3V
(BOOST SW) Voltages .............................7V to 0.3V
RUN/SS, PGOOD Voltages .......................... 7V to 0.3V
TRACK Voltage ............................................7V to 0.3V
V_RNG Voltage ................................ V_CC + 0.3V to 0.3V

I_THVoltage ............................................. 2.7V to 0.3V
V_FB Voltage ............................................. 2.7V to 0.3V
INTLPF, EXTLPF Voltages ........................ 2.7V to 0.3V
VOS
^+, VOS
Voltages .................................................. 7V to 0.3V
FCB Voltage ................................................ 7V to 0.3V
Operating Temperature Range (Note 4) 40°C to 85°C
Junction Temperature (Note 2) ............................ 125°C
Storage Temperature Range
UH Package ........................................ 65°C to 125°C
G Package .......................................... 65°C to 150°C

LTC3709 Features

· PolyPhase^® Valley Current Mode Controller
· Synchronizable to an External Clock with PLL
· Coincident or Ratiometric Tracking
· Sense Resistor Optional
· 2% to 90% Duty Cycle at 200kHz
· t _ON(MIN) < 100ns
· True Remote Sensing Differential Amplifier
· High Efficiency at Both Light and Heavy Loads
· Power Good Output Voltage Monitor
· 0.6V ±1% Reference
· Adjustable Current Limit
· Programmable Soft-Start and Operating Frequency
· Output Overvoltage Protection
· Optional Short-Circuit Shutdown Timer
· Available in 32-Lead (5mm × 5mm) QFN and 36-Lead
SSOP Packages

LTC3709 Typical Application

· Notebook Computers
·Power Supply for DSP, ASIC, Graphic Processors

LTC3709 Connection Diagram

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