LTC1772B Series

Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23

Catalog

Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23

Part	Mounting Type	Control Features	Output Type	Output Configuration	Frequency - Switching	Package / Case	Function	Topology	Duty Cycle (Max) [Max]	Output Phases	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Operating Temperature [Max]	Operating Temperature [Min]	Number of Outputs	Supplier Device Package
Analog Devices LTC1772BIS6#TRPBF	Surface Mount	Enable	Transistor Driver	Positive	550 kHz	SOT-23-6 Thin TSOT-23-6	Step-Down Step-Up Step-Up/Step-Down	Boost Buck Flyback	100 %	1	9.8 V	2.5 V	85 °C	-40 °C	1	TSOT-23-6
Analog Devices LTC1772HS6#TRPBF	Surface Mount	Enable	Transistor Driver	Positive	550 kHz	SOT-23-6 Thin TSOT-23-6	Step-Down Step-Up Step-Up/Step-Down	Boost Buck Flyback	100 %	1	9.8 V	2.5 V	140 °C	-40 °C	1	TSOT-23-6
Analog Devices LTC1772BES6#TRPBF	Surface Mount	Enable	Transistor Driver	Positive	550 kHz	SOT-23-6 Thin TSOT-23-6	Step-Down Step-Up Step-Up/Step-Down	Boost Buck Flyback	100 %	1	9.8 V	2.5 V	85 °C	-40 °C	1	TSOT-23-6
Analog Devices LTC1772IS6#TRMPBF	Surface Mount	Enable	Transistor Driver	Positive	550 kHz	SOT-23-6 Thin TSOT-23-6	Step-Down Step-Up Step-Up/Step-Down	Boost Buck Flyback	100 %	1	9.8 V	2.5 V	85 °C	-40 °C	1	TSOT-23-6

Catalog

Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23

Key Features

• Burst Mode®Operation Disabled for Lower Output Ripple at Light Loads

• High Efficiency: Up to 94%

• High Output Currents Easily Achieved

• Wide VINRange: 2.5V to 9.8V

• Constant Frequency 550kHz Operation

• Low Dropout: 100% Duty Cycle

• Output Voltage down to 0.8V

• Current Mode Operation for Excellent Line and Load Transient Response

• Shutdown Mode Draws Only 8µA Supply Current

• Tiny 6-Lead SOT-23 Package

Description

The LTC1772B is a constant frequency current mode step-down DC/DC controller providing excellent AC and DC load and line regulation. The device incorporates an accurate undervoltage lockout feature that shuts down the LTC1772B when the input voltage falls below 2.0V.The LTC1772B provides a ±2.5% output voltage accuracy and consumes only 270µA of quiescent current. In shutdown, the device draws a mere 8µA.To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle). High constant operating frequency of 550kHz allows the use of a small external inductor.The LTC1772B is available in a small footprint 6-lead SOT-23.For a Burst Mode operation enabled version of the LTC1772B, please refer to the LTC1772 data sheet.Burst ModeLTC1772YesLTC1772BNoApplicationsOne or Two Lithium-Ion-Powered ApplicationsCellular TelephonesWireless DevicesPortable ComputersDistributed 3.3V, 2.5V or 1.8V Power Systems