LTC3859AL
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LTC3859AL

Triple Output, Buck/Buck/Boost Synchronous Controller with 28μA Burst Mode IQ

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 20
1ku List Price Starting From $5.19
Features
  • Low Operating IQ: 28μA (One Channel On)
  • Dual Buck Plus Single Boost Synchronous Controllers
  • Outputs Remain in Regulation Through Cold Crank Down to 2.5V
  • 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 Even in Burst Mode® Operation
  • 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: 10μA
  • Small 38-Lead 5mm × 7mm QFN and TSSOP Packages
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
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The LTC3859AL 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 LTC3859AL 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 LTC3859AL can operate from an input supply as low as 2.5V after start-up.

The 28μA 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 LTC3859AL features a precision 0.8V reference for the bucks, 1.2V reference for the boost and a power good output indicator. The PLLIN/MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous inductor current mode at light loads.

Compared to the LTC3859 and the LTC3859A, the LTC3859AL is fully pin-compatible, but with lower Burst Mode operation IQ (28µA with one channel on).

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

APPLICATIONS

  • Automotive Always-On and Start-Stop Systems
  • Battery Operated Digital Devices
  • Distributed DC Power Systems
  • Multioutput Buck-Boost Applications
Part Models 20
1ku List Price Starting From $5.19

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

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Apr 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

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Jul 31, 2020

- 20_0245

Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)

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Filter by Model

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Part Models

Product Lifecycle

PCN

Apr 6, 2022

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Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LTC3859ALEFE#PBF

PRODUCTION

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LTC3859ALMPFE#TRPBF

PRODUCTION

Jul 31, 2020

- 20_0245

arrow down

Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)

LTC3859ALEFE#PBF

PRODUCTION

LTC3859ALEFE#TRPBF

PRODUCTION

LTC3859ALEUHF#PBF

PRODUCTION

LTC3859ALEUHF#TRPBF

PRODUCTION

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

reference details image

DC2122A

LTC3859ALEUHF Demo Board | 4.5V ≤ VIN ≤ 36V; VOUT1: 5V @ 5A, VOUT2: 8.5V @ 3A, VOUT3: 10V @ 7A

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DC2122A

LTC3859ALEUHF Demo Board | 4.5V ≤ VIN ≤ 36V; VOUT1: 5V @ 5A, VOUT2: 8.5V @ 3A, VOUT3: 10V @ 7A

LTC3859ALEUHF Demo Board | 4.5V ≤ VIN ≤ 36V; VOUT1: 5V @ 5A, VOUT2: 8.5V @ 3A, VOUT3: 10V @ 7A

Product Detail

Demonstration circuit 2122A is a triple output synchronous step-up/dual step-down supply featuring the LTC3859AL. This demonstration circuit is designed for two buck 5V/5A, 8.5V/3A outputs supplied by a boosted 10V/7A output. Benefiting from this feature, the buck outputs are able to maintain regulation over a wide input voltage range of 4.5V to 36V which is suitable for automotive or other battery fed applications. Also, the demonstration circuit uses a drop-in layout that the main buck circuit components fit in an area of ¾" by 1½", while the main boost circuit area is ¾" by 1¾". The package style for the LTC3859AL is a 38-pin exposed pad QFN package.

Tools & Simulations

Tools & Simulations 2

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

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