LTC3859EUHF#PBF Multitopology DC/DC by Analog Devices

Status: Production
Series: LTC3859
RoHS: Compliant
Download Datasheet Visit Manufacturer Site View Pricing & Stock

The LTC3859 is a high performance triple output (buck/ buck/boost) synchronous DC/DC switching regulator controller that drives all N-channel power MOSFET stages. Constant frequency current mode architecture allows a phase-lockable switching frequency of up to 850kHz. The LTC3859 operates from a wide 4.5V to 38V input supply range. When biased from the output of the boost converter or another auxiliary supply, the LTC3859 can operate from an input supply as low as 2.5V after start-up.The 55μA no-load quiescent current extends operating runtime in battery powered systems. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3859 features a precision 0.8V reference for the bucks, 1.2V reference for the boost and a power good output indicator.Independent TRACK/SS pins for each controller ramp the output voltages during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The PLLIN/ MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous inductor current mode at light loads. Quiescent Current (Burst Mode) Notes LTC3859AL 28μA-One channel on, Buck 38μA-All three channels on Internal clamp on the INTVCC pin LTC3859A 55μA-One channel on, Buck 80μA-All three channels on Internal clamp on the INTVCC pin. For new designs, we recommend LTC3859AL LTC3859 55μA-One channel on, Buck 80μA-All three channels on For new designs, we recommend LTC3859AL

Where to Buy

Prices starting from US$5.19

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Features

Dual Buck Plus Single Boost Synchronous Controllers
Outputs Remain in Regulation Through Cold Crank Down to 2.5V
Low Operating IQ: 55μA (One Channel On)
Wide Bias Input Voltage Range: 4.5V to 38V
Buck Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
Boost Output Voltage Up to 60V
RSENSE or DCR Current Sensing
100% Duty Cycle for Boost Synchronous MOSFET
Phase-Lockable Frequency (75kHz to 850kHz)
Programmable Fixed Frequency (50kHz to 900kHz)
Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode® Operation at Light Loads
Very Low Buck Dropout Operation: 99% Duty Cycle
Adjustable Output Voltage Soft-Start or Tracking
Low Shutdown IQ: 14μA
Small 38-Pin 5mm × 7mm QFN and TSSOP Packages

Alternative Descriptions

L IQ, 3x Out, Buck/Buck/Boost | Analog Devices
POWER MANAGEMENT IC | Richardson RFPD


LTC3859EUHF#PBF Semiconductors - ICs by Linear Technology

IC BUCK/BUCK/BOOST TRIPLE 38QFN

Status: Unknown
Series: -
RoHS: Unknown
Download Datasheet Visit Manufacturer Site View Pricing & Stock

Specifications

Supply Voltage Min 4.5V
Supply Voltage Max 38V
No. of Outputs 3 Output, 3Outputs
Duty Cycle (%) 100%
Controller IC Case Style QFN
No. of Pins 38Pins
Switching Frequency 585kHz
Topology Synchronous Boost Synchronous Buck Synchronous Buck
Operating Temperature Min -40°C
Operating Temperature Max 125°C
Product Range -
Automotive Qualification Standard -
RoHS Phthalates Compliant Yes
MSL MSL 1 - Unlimited
SVHC No SVHC (15-Jan-2018)
Operating Temperature Range -40°C to +125°C
Output Current 25A
Output Voltage 60V
Primary Input Voltage 38V

Frequently Asked Questions

Where can I find additional details, specifications and documents for a LTC3859EUHF#PBF?

Additional datasheets, footprints and schematics for LTC3859EUHF#PBF are listed on our Part Details page. You can also find images and similar parts to LTC3859EUHF#PBF on this page.

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What category does LTC3859EUHF#PBF fall under?

The LTC3859EUHF#PBF is listed under Multitopology DC/DC.

Can I view similar or alternative parts?

You can view similar parts to LTC3859EUHF#PBF when available in the Multitopology DC/DC range under the specifications section at the bottom of the details page.

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Is the LTC3859EUHF#PBF RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by Analog Devices.

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Authorised distributors including Analog Devices and Richardson RFPD have stock available or on a lead time for LTC3859EUHF#PBF.

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