Specification	LTC3858EUH#PBF

Clock Sync	False
Control Features	Frequency Control, Power Good, Current Limit, Soft Start, Enable
Duty Cycle (Max) [Max]	99.4 %
Frequency - Switching [Max]	535 kHz, 835 kHz
Frequency - Switching [Min]	350 kHz, 105 kHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	2
Operating Temperature [Max]	125 °C
Operating Temperature [Min]	-40 C
Output Configuration	Positive
Output Phases	2
Output Type	Transistor Driver
Supplier Device Package	32-QFN (5x5)
Synchronous Rectifier	True
Topology	Buck
Voltage - Supply (Vcc/Vdd) [Max]	38 V
Voltage - Supply (Vcc/Vdd) [Min]	4 V

LTC3858 Series

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

Part	Frequency - Switching [Min]	Frequency - Switching [Max]	Output Configuration	Function	Output Phases	Control Features	Supplier Device Package	Mounting Type	Duty Cycle (Max) [Max]	Operating Temperature [Min]	Operating Temperature [Max]	Topology	Number of Outputs	Output Type	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]
Analog Devices Inc./Maxim Integrated LTC3858EUH#TRPBF	105 kHz 350 kHz	535 kHz 835 kHz	Positive	Step-Down	2	Current Limit Enable Frequency Control Power Good Soft Start	32-QFN (5x5)	Surface Mount	99.4 %	-40 C	125 °C	Buck	2	Transistor Driver	4 V	38 V
Analog Devices Inc./Maxim Integrated LTC3858IUH#PBF	105 kHz 350 kHz	535 kHz 835 kHz	Positive	Step-Down	2	Current Limit Enable Frequency Control Power Good Soft Start	32-QFN (5x5)	Surface Mount	99.4 %	-40 C	125 °C	Buck	2	Transistor Driver	4 V	38 V
Analog Devices Inc./Maxim Integrated LTC3858IUH#TRPBF	105 kHz 350 kHz	535 kHz 835 kHz	Positive	Step-Down	2	Current Limit Enable Frequency Control Power Good Soft Start	32-QFN (5x5)	Surface Mount	99.4 %	-40 C	125 °C	Buck	2	Transistor Driver	4 V	38 V
Analog Devices Inc./Maxim Integrated LTC3858EUH#PBF	105 kHz 350 kHz	535 kHz 835 kHz	Positive	Step-Down	2	Current Limit Enable Frequency Control Power Good Soft Start	32-QFN (5x5)	Surface Mount	99.4 %	-40 C	125 °C	Buck	2	Transistor Driver	4 V	38 V
Analog Devices Inc./Maxim Integrated LTC3858IUH-2#TRPBF	105 kHz 350 kHz	535 kHz 835 kHz	Positive	Step-Down	2	Current Limit Enable Frequency Control Phase Control Power Good Soft Start	32-QFN (5x5)	Surface Mount	99 %	-40 C	125 °C	Buck	2	Transistor Driver	4 V	38 V

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$	Updated

Digikey	N/A	128	$ 12.20	1m+

Description

General part information

LTC3858 Series

The LTC3858-2 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 LTC3858-2 differs from the LTC3858 by having the overvoltage protection crowbar and short-circuit latchoff disabled. 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. Current foldback limits MOSFET heat dissipation during short-circuit conditions.LTC3858LTC3858-1LTC3858-2FeaturesAdjustable Current Limit, Clock Output, Phase Modulation, 2 PGOOD OutputsFixed Current Limit, One PGOOD OutputOvervoltage protection crowbar and short-circuit latchoff disabledPackageQFN-32SSOP-28QFN-32ApplicationsAutomotive SystemsBattery Operated Digital DevicesDistributed DC Power Systems

Documents

Technical documentation and resources

R526 Reliability Data

Reliability Data

LTC3858EUH#PBF | Datasheet

Datasheet