LTC3785IUF

Obsolete

Analog Devices Inc./Maxim Integrated

IC POWER MANAGEMENT

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LTC3785IUF

Obsolete

Analog Devices Inc./Maxim Integrated

IC POWER MANAGEMENT

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Description Specifications Series Pricing CAD Documents

Description

General part information

LTC3785 Series

The LTC3785 is a high power synchronous buck-boost controller that drives all N-channel power MOSFETs from input voltages above, below and equal to the output voltage. With an input range of 2.7V to 10V, the LTC3785 is well suited for a wide variety of single or dual cell Li-Ion or multicell alkaline/NiMH applications.The operating frequency can be programmed from 100kHz to 1MHz. The soft-start time and current limit are also programmable. The soft-start capacitor doubles as the fault timer which can program the IC to latch off or recycle after a determined off time. Burst Mode operation is user controlled and can be enabled by driving the MODE pin high.Protection features include foldback current limit, shortcircuit and overvoltage protection.Power GoodLTC3785NoLTC3785-1YesApplicationsPalmtop ComputersHandheld InstrumentsWireless ModemsCellular Telephones

Technical Specifications

Parameters and characteristics for this part

Specification	LTC3785IUF

Clock Sync	No
Control Features	Enable, Soft Start, Current Limit
Duty Cycle (Max)	99 %
Frequency - Switching (Max)	1 MHz
Frequency - Switching (Min)	100 kHz
Function	Step-Up, 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	1
Output Type	Transistor Driver
Package / Case	24-WFQFN Exposed Pad
Package Length	4 mm
Package Name	24-QFN
Package Width	4 mm
Synchronous Rectifier	Yes
Topology	Buck-Boost
Voltage - Supply (Vcc/Vdd) Maximum	10 V
Voltage - Supply (Vcc/Vdd) Minimum	2.7 V

LTC3785 Series

10V, High Efficiency, Buck-Boost Controller with Power Good

Part	Package / Case	Function	Synchronous Rectifier	Duty Cycle (Max)	Control Features	Mounting Type	Package Width	Package Name	Package Length	Output Type	Clock Sync	Topology	Output Phases	Frequency - Switching (Max)	Frequency - Switching (Min)	Output Configuration	Number of Outputs	Operating Temperature (Max)	Operating Temperature (Min)	Voltage - Supply (Vcc/Vdd) Minimum	Voltage - Supply (Vcc/Vdd) Maximum
Analog Devices Inc./Maxim Integrated LTC3785EUF-1#TRPBF	24-WFQFN Exposed Pad	Step-Down Step-Up	Yes	99 %	Current Limit Enable Soft Start	Surface Mount	4 mm	24-QFN	4 mm	Transistor Driver	No	Buck-Boost	1	1 MHz	100 kHz	Positive	2	85 °C	-40 °C	2.7 V	10 V
Analog Devices Inc./Maxim Integrated LTC3785IUF	24-WFQFN Exposed Pad	Step-Down Step-Up	Yes	99 %	Current Limit Enable Soft Start	Surface Mount	4 mm	24-QFN	4 mm	Transistor Driver	No	Buck-Boost	1	1 MHz	100 kHz	Positive	2	125 °C	-40 °C	2.7 V	10 V
Analog Devices Inc./Maxim Integrated LTC3785EUF#PBF	24-WFQFN Exposed Pad	Step-Down Step-Up	Yes	99 %	Current Limit Enable Soft Start	Surface Mount	4 mm	24-QFN	4 mm	Transistor Driver	No	Buck-Boost	1	1 MHz	100 kHz	Positive	2	85 °C	-40 °C	2.7 V	10 V
Analog Devices Inc./Maxim Integrated LTC3785EUF#TRPBF	24-WFQFN Exposed Pad	Step-Down Step-Up	Yes	99 %	Current Limit Enable Soft Start	Surface Mount	4 mm	24-QFN	4 mm	Transistor Driver	No	Buck-Boost	1	1 MHz	100 kHz	Positive	2	85 °C	-40 °C	2.7 V	10 V
Analog Devices Inc./Maxim Integrated LTC3785EUF-1#PBF	24-WFQFN Exposed Pad	Step-Down Step-Up	Yes	99 %	Current Limit Enable Soft Start	Surface Mount	4 mm	24-QFN	4 mm	Transistor Driver	No	Buck-Boost	1	1 MHz	100 kHz	Positive	2	85 °C	-40 °C	2.7 V	10 V
Analog Devices Inc./Maxim Integrated LTC3785IUF#TRPBF	24-WFQFN Exposed Pad	Step-Down Step-Up	Yes	99 %	Current Limit Enable Soft Start	Surface Mount	4 mm	24-QFN	4 mm	Transistor Driver	No	Buck-Boost	1	1 MHz	100 kHz	Positive	2	125 °C	-40 °C	2.7 V	10 V
Analog Devices Inc./Maxim Integrated LTC3785IUF#PBF	24-WFQFN Exposed Pad	Step-Down Step-Up	Yes	99 %	Current Limit Enable Soft Start	Surface Mount	4 mm	24-QFN	4 mm	Transistor Driver	No	Buck-Boost	1	1 MHz	100 kHz	Positive	2	125 °C	-40 °C	2.7 V	10 V
Analog Devices Inc./Maxim Integrated LTC3785EUF-1	24-WFQFN Exposed Pad	Step-Down Step-Up	Yes	99 %	Current Limit Enable Soft Start	Surface Mount	4 mm	24-QFN	4 mm	Transistor Driver	No	Buck-Boost	1	1 MHz	100 kHz	Positive	2	85 °C	-40 °C	2.7 V	10 V

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

LTC3785IUF | Datasheet