LTC3868IUH#PBF

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Analog Devices

LOW IQ, DUAL 2-PHASE SYNCHRONOUS STEP-DOWN CONTROLLER

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LTC3868IUH#PBF

Active

Analog Devices

LOW IQ, DUAL 2-PHASE SYNCHRONOUS STEP-DOWN CONTROLLER

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DocumentsDatasheet R526 Reliability Data

Specifications Pricing Series Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	LTC3868IUH#PBF

Clock Sync	False
Control Features	Enable, Phase Control, Power Good, Soft Start, Current Limit, Frequency Control
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]	85 °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]	24 V
Voltage - Supply (Vcc/Vdd) [Min]	4 V

LTC3868-1 Series

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

Part	Output Type	Control Features	Function	Output Configuration	Number of Outputs	Operating Temperature [Max]	Operating Temperature [Min]	Topology	Supplier Device Package	Output Phases	Mounting Type	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Duty Cycle (Max) [Max]	Frequency - Switching [Max]	Frequency - Switching [Min]	Package / Case
Analog Devices LTC3868IUH#PBF	Transistor Driver	Current Limit Enable Frequency Control Phase Control Power Good Soft Start	Step-Down	Positive	2	85 °C	-40 °C	Buck	32-QFN (5x5)	2	Surface Mount	4 V	24 V	99.4 %	535 kHz 835 kHz	105 kHz 350 kHz
Analog Devices LTC3868EUFD-1#TRPBF	Transistor Driver	Enable Frequency Control Power Good Soft Start	Step-Down	Positive	2	85 °C	-40 °C	Buck	28-QFN (4x5)	2	Surface Mount	4 V	24 V	99.4 %	535 kHz 835 kHz	105 kHz 350 kHz	28-WFQFN Exposed Pad
Analog Devices LTC3868EUH#TRPBF	Transistor Driver	Current Limit Enable Frequency Control Phase Control Power Good Soft Start	Step-Down	Positive	2	85 °C	-40 °C	Buck	32-QFN (5x5)	2	Surface Mount	4 V	24 V	99.4 %	535 kHz 835 kHz	105 kHz 350 kHz
Analog Devices LTC3868IGN-1#PBF	Transistor Driver	Enable Frequency Control Power Good Soft Start	Step-Down	Positive	2	85 °C	-40 °C	Buck	28-SSOP	2	Surface Mount	4 V	24 V	99.4 %	535 kHz 835 kHz	105 kHz 350 kHz	28-SSOP
Analog Devices LTC3868EUFD-1#PBF	Transistor Driver	Enable Frequency Control Power Good Soft Start	Step-Down	Positive	2	85 °C	-40 °C	Buck	28-QFN (4x5)	2	Surface Mount	4 V	24 V	99.4 %	535 kHz 835 kHz	105 kHz 350 kHz	28-WFQFN Exposed Pad

Pricing

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

Distributor	Package	Quantity	$

Digikey	Tube	1	$ 9.73
		10	$ 6.59
		73	$ 5.03
		146	$ 4.65
		292	$ 4.41

Description

General part information

LTC3868-1 Series

The LTC3868-1 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 LTC3868-1 features a precision 0.8V reference and a power good output indicator. A wide 4V to 24V 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. The output short-circuit latchoff feature further protects the circuit in short-circuit conditions.For a leadless 32-pin QFN package with the additional features of adjustable current limit, clock out, phase modulation and two PGOOD outputs, see the LTC3868 data sheet.LTC3868LTC3868-1FeaturesAdjustable Current Limit, Clock Out Pin, Phase Modulation, Two PGOODFixed Current Limit, One PGOODPackageQFN-32SSOP-28ApplicationsNotebook and Palmtop ComputersPortable InstrumentsBattery Operated Digital DevicesDistributed DC Power Systems