LTC3822-1 Series

No RSENSE™, Low Input Voltage, Synchronous Step-Down DC/DC Controller

Catalog

No RSENSE™, Low Input Voltage, Synchronous Step-Down DC/DC Controller

Part	Number of Outputs	Package / Case	Package / Case	Package / Case	Operating Temperature [Max]	Operating Temperature [Min]	Frequency - Switching	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Duty Cycle (Max) [Max]	Function	Mounting Type	Supplier Device Package	Output Phases	Control Features	Output Type	Topology	Output Configuration	Package / Case
Analog Devices LTC3822EGN-1#TRPBF	1	0.154 in	16-SSOP	3.9 mm	85 °C	-40 °C	300 kHz 550 kHz 750 kHz	4.5 V	2.75 V	99 %	Step-Down	Surface Mount	16-SSOP	1	Enable Power Good Soft Start Tracking	Transistor Driver	Buck	Positive
Analog Devices LTC3822EMSE#PBF	1		10-MSOP 10-TFSOP Exposed Pad		85 °C	-40 °C	300 kHz 550 kHz 750 kHz	4.5 V	2.75 V	99 %	Step-Down	Surface Mount	10-MSOP-EP	1	Enable Frequency Control	Transistor Driver	Buck	Positive	0.118 in 3 Lead
Analog Devices LTC3822EDD-1#TRPBF	1		12-WFDFN Exposed Pad		85 °C	-40 °C	300 kHz 550 kHz 750 kHz	4.5 V	2.75 V	99 %	Step-Down	Surface Mount	12-DFN (3x3)	1	Enable Power Good Soft Start Tracking	Transistor Driver	Buck	Positive
Analog Devices LTC3822EDD#TRPBF	1		10-WFDFN Exposed Pad		85 °C	-40 °C	300 kHz 550 kHz 750 kHz	4.5 V	2.75 V	99 %	Step-Down	Surface Mount	10-DFN (3x3)	1	Enable Frequency Control	Transistor Driver	Buck	Positive
Analog Devices LTC3822EDD#PBF	1		10-WFDFN Exposed Pad		85 °C	-40 °C	300 kHz 550 kHz 750 kHz	4.5 V	2.75 V	99 %	Step-Down	Surface Mount	10-DFN (3x3)	1	Enable Frequency Control	Transistor Driver	Buck	Positive
Analog Devices LTC3822EDD#PBF	1		10-WFDFN Exposed Pad		85 °C	-40 °C	300 kHz 550 kHz 750 kHz	4.5 V	2.75 V	99 %	Step-Down	Surface Mount	10-DFN (3x3)	1	Enable Frequency Control	Transistor Driver	Buck	Positive
Analog Devices LTC3822EGN-1#PBF	1	0.154 in	16-SSOP	3.9 mm	85 °C	-40 °C	300 kHz 550 kHz 750 kHz	4.5 V	2.75 V	99 %	Step-Down	Surface Mount	16-SSOP	1	Enable Power Good Soft Start Tracking	Transistor Driver	Buck	Positive

Catalog

No RSENSE™, Low Input Voltage, Synchronous Step-Down DC/DC Controller

Key Features

• Dual N-Channel MOSFET Synchronous Drive

• No Current Sense Resistor Required

• Optimized for 3.3VINand Li-Ion Applications

• Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response

• ±1% 0.6V Reference

• Low Dropout Operation: 99% Duty Cycle

• Phase-Lockable or Adjustable Frequency: 250kHz to 750kHz

• Internal Soft-Start Circuitry

• Tracking and Adjustable Soft-Start Input

• Selectable Maximum Peak Current Sense Threshold

• Selectable Burst Mode®/Forced Continuous/Pulse Skipping Mode at Light Load

• Digital RUN Control Pin

• Output Overvoltage Protection

• Micropower Shutdown: IQ= 7.5µA

• Tiny Thermally Enhanced 12-Pin (3mm × 3mm) DFN or 16-Pin Narrow SSOP Packages

Description

The LTC3822-1 is a synchronous step-down switching regulator controller that drives external N-channel power MOSFETs using few external components. The constant frequency current mode architecture with MOSFET VDSsensing eliminates the need for sense resistors and improves efficiency.Burst Mode operation provides high efficiency at light loads. The 99% maximum duty cycle provides low dropout operation, extending operating time in battery-powered systems.The operating frequency can be programmed up to 750kHz, allowing the use of small surface mount inductors and capacitors. For noise sensitive applications, the LTC3822-1 can be synchronized to an external clock from 250kHz to 750kHz.The LTC3822-1 is available in the tiny footprint thermally enhanced 12-pin DFN package or 16-pin narrow SSOP package.FeaturesLTC3822Internal soft-start, 34µA in sleep modeLTC3822-1External soft start, selectable pulse skip/Burst Mode operation, power good (SSOP-16 package only), 105µA in sleep modeApplicationsSingle Cell Li-Ion Powered Systems3.3VINSystems