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LTC3708, LTC3708EG, LTC3708EUH

Table of contents:
Info of LTC3708
Info of LTC3708EG
Info of LTC3708EUH

LTC3708, LTC3708EG, LTC3708EUH Selling Leads, Datasheet

MFG:Linear Technology Category:Integrated Circuits (ICs) Package Cooled:QFN D/C:404

LTC3708, LTC3708EG, LTC3708EUH Datasheet download

Five Points

Part Number: LTC3708EUH

Category: Integrated Circuits (ICs)

MFG: Linear Technology

Package Cooled: QFN

D/C: 404

Description: IC CTRLR BUCK 2PH STEPDOWN 32QFN

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LTC3708 General 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 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.

LTC3708 Maximum Ratings

Input Supply Voltage (V_CC, DRV_CC) ............ 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
I_ON1, I_ON2 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 ............ V_CC + 0.3V to 0.3V
V_RNG1, V_RNG2 Voltages ................. V_CC + 0.3V to 0.3V
I_TH1, I_TH2 Voltages ................................. 2.7V to 0.3V
V_FB1, V_FB2 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

LTC3708 Features

` Very Low Duty Factor Operation (_tON(MIN) < 85ns)
` No R_SENSE_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 V_INRange: 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

LTC3708 Typical Application

· Digital Signal Processors
· Network Servers

LTC3708 Connection Diagram

LTC3708EUH Parameters

Technical/Catalog Information	LTC3708EUH
Vendor	Linear Technology
Category	Integrated Circuits (ICs)
Type	Step-Down (Buck)
Number of Outputs	2
Voltage - Input	Adj down to 36V
Voltage - Output	Adj down to 0.6V
Current - Output	-
Power - Output	-
Package / Case	32-QFN
Packaging	Tube
Internal Switch(s)	No
Synchronous	Yes
Rds (On)	-
Operating Temperature	-40°C ~ 85°C
Frequency - Switching	-
Drawing Number	161; 05-08-1693; UH; 32
Lead Free Status	Contains Lead
RoHS Status	RoHS Non-Compliant
Other Names	LTC3708EUH LTC3708EUH

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