LTC3772 Series

Micropower No RSENSEConstant Frequency Step-Down DC/DC Controller

Manufacturer: Analog Devices Inc./Maxim Integrated

Catalog

Micropower No RSENSEConstant Frequency Step-Down DC/DC Controller

Part	Output Phases	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Output Type	Control Features	Frequency - Switching	Supplier Device Package	Function	Mounting Type	Topology	Operating Temperature [Max]	Operating Temperature [Min]	Package / Case	Duty Cycle (Max) [Max]	Output Configuration	Number of Outputs	Frequency - Switching [Max]	Frequency - Switching [Min]
Analog Devices Inc./Maxim Integrated LTC3772EDDB#TRMPBF	1	2.75 V	9.8 V	Transistor Driver	Current Limit Enable	550 kHz	8-DFN (3x2)	Step-Down	Surface Mount	Buck	85 C	-40 ¯C	8-WFDFN Exposed Pad	100 %	Positive	1
Analog Devices Inc./Maxim Integrated LTC3772ETS8#TRPBF	1	2.75 V	9.8 V	Transistor Driver	Current Limit Enable	550 kHz	TSOT-23-8	Step-Down	Surface Mount	Buck	85 C	-40 ¯C	SOT-23-8 Thin TSOT-23-8	100 %	Positive	1
Analog Devices Inc./Maxim Integrated LTC3772EDDB#TRPBF	1	2.75 V	9.8 V	Transistor Driver	Current Limit Enable	550 kHz	8-DFN (3x2)	Step-Down	Surface Mount	Buck	85 C	-40 ¯C	8-WFDFN Exposed Pad	100 %	Positive	1
Analog Devices Inc./Maxim Integrated LTC3772BEDDB#TRPBF	1	2.75 V	9.8 V	Transistor Driver	Current Limit Enable		8-DFN (3x2)	Step-Down	Surface Mount	Buck	85 C	-40 ¯C	8-WFDFN Exposed Pad	100 %	Positive	1	550 kHz	200 kHz
Analog Devices Inc./Maxim Integrated LTC3772ETS8#TRMPBF	1	2.75 V	9.8 V	Transistor Driver	Current Limit Enable	550 kHz	TSOT-23-8	Step-Down	Surface Mount	Buck	85 C	-40 ¯C	SOT-23-8 Thin TSOT-23-8	100 %	Positive	1

Catalog

Micropower No RSENSEConstant Frequency Step-Down DC/DC Controller

Description

The LTC3772 is a constant frequency current mode step-down DC/DC controller in a low profile 8-lead SOT-23 (ThinSOT™) and a 3mm × 2mm DFN package. The No RSENSE™architecture eliminates the need for a current sense resistor, improving efficiency and saving board space.The LTC3772 automatically switches into Burst Mode operation at light loads to increase efficiency at low output current. It consumes only 40µA of quiescent current under a no-load condition.The LTC3772 incorporates an undervoltage lockout feature that shuts down the device when the input voltage falls below 2V. To maximize the runtime from a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle). High switching frequency of 550kHz allows the use of a small inductor and capacitors. An internal soft-start smoothly ramps the output voltage from zero to its regulation point.Burst ModeLTC3772YesLTC3772BNoApplications1- or 2-Cell Li-Ion Battery-Powered ApplicationsWireless DevicesPortable ComputersDistributed Power Systems