Specification	LTC3869IUFD#PBF

Clock Sync	False
Control Features	Soft Start, Enable, Frequency Control, Power Good, Tracking, Current Limit
Duty Cycle (Max) [Max]	95 %
Frequency - Switching [Max]	780 kHz
Frequency - Switching [Min]	250 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
Package / Case	28-WFQFN Exposed Pad
Supplier Device Package	28-QFN (4x5)
Synchronous Rectifier	True
Topology	Buck
Voltage - Supply (Vcc/Vdd) [Max]	38 V
Voltage - Supply (Vcc/Vdd) [Min]	4 V

LTC3869 Series

Part	Output Type	Control Features	Frequency - Switching [Min]	Frequency - Switching [Max]	Duty Cycle (Max) [Max]	Supplier Device Package	Output Phases	Mounting Type	Operating Temperature [Min]	Operating Temperature [Max]	Topology	Package / Case	Function	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Output Configuration	Number of Outputs	Package / Case [x]	Package / Case [y]
Analog Devices Inc./Maxim Integrated LTC3869EUFD#PBF	Transistor Driver	Current Limit Enable Frequency Control Power Good Soft Start Tracking	250 kHz	780 kHz	95 %	28-QFN (4x5)	2	Surface Mount	-40 C	125 °C	Buck	28-WFQFN Exposed Pad	Step-Down	4 V	38 V	Positive	2
Analog Devices Inc./Maxim Integrated LTC3869EUF#TRPBF	Transistor Driver	Current Limit Enable Frequency Control Power Good Soft Start Tracking	250 kHz	780 kHz	95 %	28-QFN (4x4)	2	Surface Mount	-40 C	125 °C	Buck	28-WFQFN Exposed Pad	Step-Down	4 V	38 V	Positive	2
Analog Devices Inc./Maxim Integrated LTC3869IUF#PBF	Transistor Driver	Current Limit Enable Frequency Control Power Good Soft Start Tracking	250 kHz	780 kHz	95 %	28-QFN (4x4)	2	Surface Mount	-40 C	125 °C	Buck	28-WFQFN Exposed Pad	Step-Down	4 V	38 V	Positive	2
Analog Devices Inc./Maxim Integrated LTC3869IUFD#PBF	Transistor Driver	Current Limit Enable Frequency Control Power Good Soft Start Tracking	250 kHz	780 kHz	95 %	28-QFN (4x5)	2	Surface Mount	-40 C	125 °C	Buck	28-WFQFN Exposed Pad	Step-Down	4 V	38 V	Positive	2
Analog Devices Inc./Maxim Integrated LTC3869IUF#TRPBF	Transistor Driver	Current Limit Enable Frequency Control Power Good Soft Start Tracking	250 kHz	780 kHz	95 %	28-QFN (4x4)	2	Surface Mount	-40 C	125 °C	Buck	28-WFQFN Exposed Pad	Step-Down	4 V	38 V	Positive	2
Analog Devices Inc./Maxim Integrated LTC3869IUFD#TRPBF	Transistor Driver	Current Limit Enable Frequency Control Power Good Soft Start Tracking	250 kHz	780 kHz	95 %	28-QFN (4x5)	2	Surface Mount	-40 C	125 °C	Buck	28-WFQFN Exposed Pad	Step-Down	4 V	38 V	Positive	2
Analog Devices Inc./Maxim Integrated LTC3869EUF#PBF	Transistor Driver	Current Limit Enable Frequency Control Power Good Soft Start Tracking	250 kHz	780 kHz	95 %	28-QFN (4x4)	2	Surface Mount	-40 C	125 °C	Buck	28-WFQFN Exposed Pad	Step-Down	4 V	38 V	Positive	2
Analog Devices Inc./Maxim Integrated LTC3869EUFD#TRPBF	Transistor Driver	Current Limit Enable Frequency Control Power Good Soft Start Tracking	250 kHz	780 kHz	95 %	28-QFN (4x5)	2	Surface Mount	-40 C	125 °C	Buck	28-WFQFN Exposed Pad	Step-Down	4 V	38 V	Positive	2
Analog Devices Inc./Maxim Integrated LTC3869IGN-2#PBF	Transistor Driver	Current Limit Enable Frequency Control Power Good Soft Start Tracking	250 kHz	780 kHz	95 %	28-SSOP	2	Surface Mount	-40 C	125 °C	Buck	28-SSOP	Step-Down	4 V	38 V	Positive	2	0.154 in	3.9 mm
Analog Devices Inc./Maxim Integrated LTC3869IGN-2#TRPBF	Transistor Driver	Current Limit Enable Frequency Control Power Good Soft Start Tracking	250 kHz	780 kHz	95 %	28-SSOP	2	Surface Mount	-40 C	125 °C	Buck	28-SSOP	Step-Down	4 V	38 V	Positive	2	0.154 in	3.9 mm

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	$ 9.58	1m+
Mouser	N/A	1	$ 8.03	1m+
		10	$ 6.22
		25	$ 5.75
		73	$ 4.81
		292	$ 4.61
		511	$ 4.56
		1022	$ 4.51
		2555	$ 4.50

Description

General part information

LTC3869 Series

The LTC3869 is a high performance dual synchronous 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 780kHz. Power loss and noise due to the ESR of the input capacitors are minimized by operating the two controller output stages out-of-phase.OPTI-LOOP®compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. A wide 4V to 38V input supply range encompasses most battery chemistries. Independent TK/SS pins for each controller ramp the output voltage during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The MODE/PLLIN pin selects among Burst Mode®operation, pulse-skipping mode, or continuous inductor current mode and allows the IC to be synchronized to an external clock.The LTC3869 is available in low profile 4mm × 4mm and 4mm × 5mm QFN packages. The LTC3869-2 is available in an SSOP-28 package. The LTC3869 is pin-compatible with the LTC3850.ApplicationsServer SystemsTelecom SystemsIndustrial and Medical InstrumentsHigh Power Battery-Operated DevicesDC Power Distribution Systems

Documents

Technical documentation and resources

R526 Reliability Data

Reliability Data

LTC3869IUFD#PBF | Datasheet

Datasheet