LTC3803-5 Series

Constant Frequency Current Mode Flyback DC/DC Controller in ThinSOT

Catalog

Constant Frequency Current Mode Flyback DC/DC Controller in ThinSOT

Part	Operating Temperature [Max]	Operating Temperature [Min]	Mounting Type	Topology	Package / Case	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Duty Cycle (Max)	Output Phases	Supplier Device Package	Function	Number of Outputs	Output Type	Frequency - Switching	Control Features	Output Configuration
Analog Devices LTC3803HS6#TRMPBF	150 °C	-40 °C	Surface Mount	Flyback	SOT-23-6 Thin TSOT-23-6	5.7 V	8 V	80 %	1	TSOT-23-6	Step-Up/Step-Down	1	Transistor Driver	200 kHz	Current Limit Enable	Isolation Capable Positive
Analog Devices LTC3803IS6-5#TRPBF	125 ¯C	-40 °C	Surface Mount	Flyback	SOT-23-6 Thin TSOT-23-6	4 V	8.1 V	80 %	1	TSOT-23-6	Step-Up/Step-Down	1	Transistor Driver	200 kHz	Current Limit Enable	Isolation Capable Positive
Analog Devices LTC3803MPS6-3#TRPBF	150 °C	-55 °C	Surface Mount	Flyback	SOT-23-6 Thin TSOT-23-6	5.7 V	8 V	80 %	1	TSOT-23-6	Step-Up/Step-Down	1	Transistor Driver	300 kHz	Current Limit Enable	Isolation Capable Positive
Analog Devices LTC3803HS6-5#TRPBF	150 °C	-40 °C	Surface Mount	Flyback	SOT-23-6 Thin TSOT-23-6	4 V	8.1 V	80 %	1	TSOT-23-6	Step-Up/Step-Down	1	Transistor Driver	200 kHz	Current Limit Enable	Isolation Capable Positive
Analog Devices LTC3803IS6#TRMPBF	125 ¯C	-40 °C	Surface Mount	Flyback	SOT-23-6 Thin TSOT-23-6	5.7 V	8 V	80 %	1	TSOT-23-6	Step-Up/Step-Down	1	Transistor Driver	200 kHz	Current Limit Enable	Isolation Capable Positive
Analog Devices LTC3803HS6#TRPBF	150 °C	-40 °C	Surface Mount	Flyback	SOT-23-6 Thin TSOT-23-6	5.7 V	8 V	80 %	1	TSOT-23-6	Step-Up/Step-Down	1	Transistor Driver	200 kHz	Current Limit Enable	Isolation Capable Positive
Analog Devices LTC3803MPS6-3#TRMPBF	150 °C	-55 °C	Surface Mount	Flyback	SOT-23-6 Thin TSOT-23-6	5.7 V	8 V	80 %	1	TSOT-23-6	Step-Up/Step-Down	1	Transistor Driver	300 kHz	Current Limit Enable	Isolation Capable Positive
Analog Devices LTC3803HS6-5#TRMPBF	150 °C	-40 °C	Surface Mount	Flyback	SOT-23-6 Thin TSOT-23-6	4 V	8.1 V	80 %	1	TSOT-23-6	Step-Up/Step-Down	1	Transistor Driver	200 kHz	Current Limit Enable	Isolation Capable Positive
Analog Devices LTC3803HS6-3#TRMPBF	150 °C	-40 °C	Surface Mount	Flyback	SOT-23-6 Thin TSOT-23-6	5.7 V	8 V	80 %	1	TSOT-23-6	Step-Up/Step-Down	1	Transistor Driver	300 kHz	Current Limit Enable	Isolation Capable Positive
Analog Devices LTC3803IS6-3#TRMPBF	125 ¯C	-40 °C	Surface Mount	Flyback	SOT-23-6 Thin TSOT-23-6	5.7 V	8 V	80 %	1	TSOT-23-6	Step-Up/Step-Down	1	Transistor Driver	300 kHz	Current Limit Enable	Isolation Capable Positive

Catalog

Constant Frequency Current Mode Flyback DC/DC Controller in ThinSOT

Key Features

• VINand VOUTLimited Only by External Components

• 4.8V Undervoltage Lockout Threshold

• Operating Junction Temperature from –55°C to 150°C

• Adjustable Slope Compensation

• Internal Soft-Start

• Constant Frequency 200kHz Operation

• ±1.5% Reference Accuracy

• Current Mode Operation for Excellent Line and Load Transient Response

• No Minimum Load Requirement

• Low Quiescent Current: 240μA

• Low Profile (1mm) SOT-23 Package

Description

The LTC3803-3 is a constant frequency current mode flyback controller optimized for driving N-channel MOSFETs in high input voltage applications. Constant frequency operation is maintained down to very light loads, resulting in less low frequency noise generation over a wide range of load currents. Slope compensation can be programmed with an external resistor.The LTC3803-3 provides ±1.5% output voltage accuracy and consumes only 240μA of quiescent current. Ground referenced current sensing allows LTC3803-3-based converters to accept input supplies beyond the LTC3803-3’s absolute maximum VCC. A micropower hysteretic start-up feature allows efficient operation at high input voltages. For simplicity, the LTC3803-3 can also be powered from a high VINthrough a resistor, due to its internal shunt regulator. An internal undervoltage lockout shuts down the LTC3803-3 when the input voltage is too low to provide sufficient gate drive to the external MOSFET.The LTC3803-3 is available in a low profile (1mm) 6-lead SOT-23 (ThinSOT™) package.Turn On VoltageFrequencyLTC38038.7V200kHzLTC3803-38.7V300kHzLTC3803-54.8V200kHzApplicationsTelecom Power Supplies42V and 12V Automotive Power SuppliesAuxiliary/Housekeeping Power SuppliesPower over Ethernet Powered Devices