Specification	LTC3857EUH#TRPBF

Clock Sync	False
Control Features	Power Good, Phase Control, Frequency Control, Tracking, Enable, Soft Start, Current Limit
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

LTC3857 Series

Part	Output Type	Supplier Device Package	Mounting Type	Duty Cycle (Max) [Max]	Control Features	Frequency - Switching [Min]	Frequency - Switching [Max]	Function	Output Configuration	Output Phases	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Topology	Operating Temperature [Min]	Operating Temperature [Max]	Package / Case [x]	Package / Case [y]	Package / Case	Number of Outputs
Analog Devices Inc./Maxim Integrated LTC3857EGN-1#TRPBF	Transistor Driver	28-SSOP	Surface Mount	99.4 %	Enable Frequency Control Power Good Soft Start Tracking	105 kHz 350 kHz	535 kHz 835 kHz	Step-Down	Positive	2	4 V	38 V	Buck	-40 C	125 °C	0.154 in	3.9 mm	28-SSOP	2
Analog Devices Inc./Maxim Integrated LTC3857IGN-1#PBF	Transistor Driver	28-SSOP	Surface Mount	99.4 %	Enable Frequency Control Power Good Soft Start Tracking	105 kHz 350 kHz	535 kHz 835 kHz	Step-Down	Positive	2	4 V	38 V	Buck	-40 C	125 °C	0.154 in	3.9 mm	28-SSOP	2
Analog Devices Inc./Maxim Integrated LTC3857EUH#PBF	Transistor Driver	32-QFN (5x5)	Surface Mount	99.4 %	Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking	105 kHz 350 kHz	535 kHz 835 kHz	Step-Down	Positive	2	4 V	38 V	Buck	-40 C	125 °C				2
Analog Devices Inc./Maxim Integrated LTC3857EUH#TRPBF	Transistor Driver	32-QFN (5x5)	Surface Mount	99.4 %	Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking	105 kHz 350 kHz	535 kHz 835 kHz	Step-Down	Positive	2	4 V	38 V	Buck	-40 C	125 °C				2
Analog Devices Inc./Maxim Integrated LTC3857IUH#TRPBF	Transistor Driver	32-QFN (5x5)	Surface Mount	99.4 %	Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking	105 kHz 350 kHz	535 kHz 835 kHz	Step-Down	Positive	2	4 V	38 V	Buck	-40 C	125 °C				2
Analog Devices Inc./Maxim Integrated LTC3857IUH#PBF	Transistor Driver	32-QFN (5x5)	Surface Mount	99.4 %	Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking	105 kHz 350 kHz	535 kHz 835 kHz	Step-Down	Positive	2	4 V	38 V	Buck	-40 C	125 °C				2

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	791	$ 12.20	1m+
Mouser	N/A	1	$ 12.20	1m+
		10	$ 8.39
		25	$ 7.40
		100	$ 6.27
		250	$ 5.98
		2500	$ 5.92

Description

General part information

LTC3857 Series

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.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 LTC3857-1 data sheet.LTC3857LTC3857-1FeaturesAdjustable Current Limit, Clock Output, Phase Modulation, 2 PGOOD OutputsFixed Current Limit, One PGOOD OutputPackageQFN-32SSOP-28ApplicationsAutomotive Always-On SystemsBattery Operated Digital DevicesDistributed DC Power Systems

Documents

Technical documentation and resources

LTC3857EUH#TRPBF | Datasheet

Datasheet

R526 Reliability Data

Reliability Data