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ADI LTC3857EUH#TRPBF product image
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ADI LTC3857EUH#TRPBFRoHS

Manufacturer
ADI
MPN
LTC3857EUH#TRPBF
LCSC Part #
C686395
Packaging
QFN-32-EP(5x5)
Customer #
Key Attributes
Low IQ, Dual, 2-Phase Synchronous Step-Down Controller
Datasheetpdf iconADI LTC3857EUH#TRPBF
In-Stock: 17
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QtyUnit PriceTotal Amount
1+$ 17.4139$ 17.41
10+$ 16.6625$ 166.63
30+$ 15.3582$ 460.75
100+$ 14.2213$ 1422.13
Standard Packaging2500/Full Reel
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Products Specifications

All
TypeDescription
CategoryIntegrated Circuits (ICs)/Power Management (PMIC)/DC DC Switching Controllers
ManufacturerADI
PackagingQFN-32-EP(5x5)
Synchronous RectifierYes
FeaturesAdjustable current limiting;Adjustable soft-start;Frequency synchronization;Light load efficient mode;Output voltage tracking;Operating status indication;Overcurrent Protection;Built-in LDO regulator
Number of Channels2
TopologyBuck
Operating Voltage4V~38V
Switch tube (built-in/external)External
Output Voltage800mV~24V
Operating Temperature-40℃~+125℃@(TJ)
Output Current-
Frequency - Switching50kHz~900kHz;75kHz~850kHz
Output TypeAdjustable
FunctionStep-down type
Quiescent Current50uA
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Introduction

AI Translation

The LTC3857 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 ESR of the input capacitor ESR are minimized by operating the two controller output stages out of phase. The 50μA no-load quiescent current extends operating run time in battery-powered systems. The LTC3857 features a precision 0.8V reference and power good output indicators. A wide 4V to 38V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries. 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.

Features

AI Translation
  • Low Operating IQ: 50μA (One Channel On)
  • Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
  • Wide VIN Range: 4V to 38V (40V Abs Max)
  • 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 Low Ripple Burst Mode Operation at Light Loads
  • Selectable Current Limit
  • Very Low Dropout Operation: 99% Duty Cycle
  • Adjustable Output Voltage Soft-Start or Tracking
  • Power Good Output Voltage Monitors
  • Output Overvoltage Protection
  • Low Shutdown IO: < 8μA
  • Internal LDO Powers Gate Drive from VIN or EXTVCC
  • No Current Foldback During Start-up
  • 5mm × 5mm QFN Package

Applications

AI Translation
  • Automotive Always-On Systems
  • Battery Operated Digital Devices
  • Distributed DC Power Systems