LTC3785-1 Series

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

Catalog

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

Part	Frequency - Switching [Max]	Frequency - Switching [Min]	Supplier Device Package	Function	Number of Outputs	Package / Case	Output Type	Duty Cycle (Max) [Max]	Topology	Mounting Type	Control Features	Output Phases	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Output Configuration	Operating Temperature [Max]	Operating Temperature [Min]
Analog Devices LTC3785EUF-1#TRPBF	1 MHz	100 kHz	24-QFN (4x4)	Step-Up/Step-Down	2	24-WFQFN Exposed Pad	Transistor Driver	99 %	Buck-Boost	Surface Mount	Current Limit Enable Soft Start	1	2.7 V	10 V	Positive	85 °C	-40 °C
Analog Devices LTC3785IUF	1 MHz	100 kHz	24-QFN (4x4)	Step-Up/Step-Down	2	24-WFQFN Exposed Pad	Transistor Driver	99 %	Buck-Boost	Surface Mount	Current Limit Enable Soft Start	1	2.7 V	10 V	Positive	125 ¯C	-40 °C
Analog Devices LTC3785EUF#PBF	1 MHz	100 kHz	24-QFN (4x4)	Step-Up/Step-Down	2	24-WFQFN Exposed Pad	Transistor Driver	99 %	Buck-Boost	Surface Mount	Current Limit Enable Soft Start	1	2.7 V	10 V	Positive	85 °C	-40 °C
Analog Devices LTC3785EUF-1#PBF	1 MHz	100 kHz	24-QFN (4x4)	Step-Up/Step-Down	2	24-WFQFN Exposed Pad	Transistor Driver	99 %	Buck-Boost	Surface Mount	Current Limit Enable Soft Start	1	2.7 V	10 V	Positive	85 °C	-40 °C
Analog Devices LTC3785EUF-1	1 MHz	100 kHz	24-QFN (4x4)	Step-Up/Step-Down	2	24-WFQFN Exposed Pad	Transistor Driver	99 %	Buck-Boost	Surface Mount	Current Limit Enable Soft Start	1	2.7 V	10 V	Positive	85 °C	-40 °C

Catalog

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

Key Features

• Single Inductor Architecture Allows VINAbove, Below or Equal to VOUT

• Power Good Output Indicator

• 2.7V to 10V Input and Output Range

• Up to 96% Efficiency

• Up to 10A of Output Current

• All N-Channel MOSFETs, No RSENSE™

• True Output Disconnect During Shutdown

• Programmable Current Limit and Soft-Start

• Optional Short-Circuit Shutdown Timer

• Output Overvoltage and Undervoltage Protection

• Programmable Frequency: 100kHz to 1MHz

• Selectable Burst Mode®Operation

• Available in 24-Lead (4mm × 4mm) Exposed Pad QFN Package

Description

The LTC3785-1 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 LTC3785-1 is well suited for a wide variety of single or dual cell Li-Ion or multi-cell 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. The LTC3785-1 includes a Power Good output that indicates when the output voltage is within 7.5% of its designed setpoint.Protection features include foldback current limit, short-circuit and overvoltage protection.Power GoodLTC3785NoLTC3785-1YesApplicationsPalmtop ComputersHandheld InstrumentsWireless ModemsCellular Telephones