LTC3858
Info: : PRODUCTION
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LTC3858

Low IQ, Dual 2-Phase Synchronous Step-Down Controller

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 4
1ku List Price Starting From $4.78
Features
  • Low Operating IQ: 170μA (One Channel On)
  • Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
  • Wide VIN Range: 4V to 38V
  • RSENSE or DCR Current Sensing
  • Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
  • OPTI-LOOP® Compensation Minimizes COUT
  • Phase-Lockable Frequency (75kHz-850kHz)
  • Programmable Fixed Frequency (50kHz-900kHz)
  • Selectable Continuous, Pulse-Skipping or Burst Mode® Operation at Light Loads
  • Very Low Dropout Operation: 99% Duty Cycle
  • Adjustable Output Voltage Soft-Start
  • Power Good Output Voltage Monitor
  • Output Overvoltage Protection
  • Output Latch-Off Protection During Short Circuit
  • Low Shutdown IQ: 8μA
  • Internal LDO Powers Gate Drive from VIN or EXTVCC
  • No Current Foldback During Start-Up
  • Small 5mm × 5mm QFN Package
Additional Details
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The LTC3858 is a high performance dual step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phase-lockable frequency of up to 850kHz. Power loss and noise due to the input capacitor ESR are minimized by operating the two controller outputs out of phase.

The 170μA no-load quiescent current extends operating life 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 LTC3858 features a precision 0.8V reference and a power good output indicator. A wide 4V to 38V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries.

Independent soft-start pins for each controller ramp the output voltages during start-up. The output latch-off feature protects the circuit in short-circuit conditions.

For a leaded 28-lead SSOP package with a fixed current limit and one PGOOD output, without phase modulation or a clock output, see the LTC3858-1 data sheet.

LTC3858 LTC3858-1 LTC3858-2
Features Adjustable Current Limit, Clock Output, Phase Modulation, 2 PGOOD Outputs Fixed Current Limit, One PGOOD Output Overvoltage protection crowbar and short-circuit latchoff disabled
Package QFN-32 SSOP-28 QFN-32

Applications

  • Automotive Systems
  • Battery Operated Digital Devices
  • Distributed DC Power Systems
Part Models 4
1ku List Price Starting From $4.78

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3858EUH#PBF
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LTC3858EUH#TRPBF
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LTC3858IUH#PBF
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Product Lifecycle

PCN

Jan 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3858EUH#PBF

PRODUCTION

LTC3858EUH#TRPBF

PRODUCTION

LTC3858IUH#PBF

PRODUCTION

LTC3858IUH#TRPBF

PRODUCTION

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)

LTC3858EUH#PBF

PRODUCTION

LTC3858EUH#TRPBF

PRODUCTION

LTC3858IUH#PBF

PRODUCTION

LTC3858IUH#TRPBF

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Jan 20, 2022

- 21_0269

arrow down

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3858EUH#PBF

PRODUCTION

LTC3858EUH#TRPBF

PRODUCTION

LTC3858IUH#PBF

PRODUCTION

LTC3858IUH#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)

LTC3858EUH#PBF

PRODUCTION

LTC3858EUH#TRPBF

PRODUCTION

LTC3858IUH#PBF

PRODUCTION

LTC3858IUH#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 3

reference details image

DC1510A-A

LTC3858EUH Demo Board | 4-Phase Solution, 16V ≤ VIN ≤ 26V, VOUT = 12V @ 50A

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DC1510A-A

LTC3858EUH Demo Board | 4-Phase Solution, 16V ≤ VIN ≤ 26V, VOUT = 12V @ 50A

LTC3858EUH Demo Board | 4-Phase Solution, 16V ≤ VIN ≤ 26V, VOUT = 12V @ 50A

Product Detail

Demonstration circuit 1510A is a high output voltage, high efficiency synchronous poly-phase buck converter featuring the LTC3858EUH. The demo circuit is available in two versions. The input voltage of both versions is 16V to 26V. DC1510A-A is configured using 2 LTC3858's with 4 phase interleaving operation which provides a 12V/50A output, while the DC1510A-B is configured with 1 LTC3858 with 2 phase inter-leaving operation which provides a 12V/25A output.

reference details image

DC1381A-B

LTC3858IUH Demo Board | 4.5V ≤ VIN ≤ 36V, VOUT1 = 3.3V @ 5A, VOUT2 = 8.5V @ 3A

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DC1381A-B

LTC3858IUH Demo Board | 4.5V ≤ VIN ≤ 36V, VOUT1 = 3.3V @ 5A, VOUT2 = 8.5V @ 3A

LTC3858IUH Demo Board | 4.5V ≤ VIN ≤ 36V, VOUT1 = 3.3V @ 5A, VOUT2 = 8.5V @ 3A

Product Detail

Demonstration circuit 1381A is a Low Quiescent Current, Dual Output Synchronous Buck Converter featuring the LTC3857EUH/LTC3858EUH. The DC1381A provides 3.3V/5A and 8.5V/3A from a wide input voltage range of 4.5V to 36V, making it suitable for automotive or other battery fed application where low quiescent current is important.


Two versions of the board are available. DC-1381A-A is for the LTC3857EUH, while the DC1381A-B is for the LTC3858EUH. The LTC3857EUH offers lower quiescent current and smaller burst mode ripple, while the LTC3858EUH offers latch-off protection and increased burst mode efficiency.

reference details image

DC1510A-B

LTC3858EUH Demo Board | Dual, 2-Phase, 16V ≤ VIN ≤ 26V, VOUT = 12V @ 25A

zoom

DC1510A-B

LTC3858EUH Demo Board | Dual, 2-Phase, 16V ≤ VIN ≤ 26V, VOUT = 12V @ 25A

LTC3858EUH Demo Board | Dual, 2-Phase, 16V ≤ VIN ≤ 26V, VOUT = 12V @ 25A

Product Detail

Demonstration circuit 1510A is a high output voltage, high efficiency synchronous poly-phase buck converter featuring the LTC3858EUH. The demo circuit is available in two versions. The input voltage of both versions is 16V to 26V. DC1510A-A is configured using 2 LTC3858's with 4 phase interleaving operation which provides a 12V/50A output, while the DC1510A-B is configured with 1 LTC3858 with 2 phase inter-leaving operation which provides a 12V/25A output.

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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