MAX256 Series

3W Primary-Side Transformer H-Bridge Driver for Isolated Supplies

Manufacturer: Analog Devices Inc./Maxim Integrated

Catalog

3W Primary-Side Transformer H-Bridge Driver for Isolated Supplies

Part	Applications	Mounting Type	Voltage - Load (Min)	Voltage - Load (Max)	Load Type	Package Length	Package Name	Package Features	Package Width	Interface	Operating Temperature (Min)	Operating Temperature (Max)	Half-Bridge Count	Output Configuration	Voltage - Supply (Maximum)	Voltage - Supply (Minimum)	Grade	Features	Rds On (Typ)	Fault Protection	Technology	Qualification	Current - Output / Channel	Board Type	Supplied Contents	Output Type	Total Output Count	Isolated Output Count	Voltage - Output (Min)	Voltage - Output (Max)	Main Purpose	Contents	Utilized IC / Part	Voltage - Input (Maximum)	Voltage - Input (Minimum)	Frequency - Switching	Current - Output
Analog Devices Inc./Maxim Integrated MAX256ASA/V+	Transformers	Surface Mount	3 V	5.5 V	Inductive	0.154 in	8-SOIC 8-SOIC-EP	Exposed Pad	3.9 mm	Logic	-40 °C	150 °C	2	Half Bridge	5.5 V	3 V	Automotive	Internal Oscillator Watchdog Timer	500 mOhm	ESD Over Temperature UVLO	Power MOSFET	AEC-Q100	1 A
Analog Devices Inc./Maxim Integrated MAX256ASA+	Transformers	Surface Mount	3 V	5.5 V	Inductive	0.154 in	8-SOIC 8-SOIC-EP	Exposed Pad	3.9 mm	Logic	-40 °C	150 °C	2	Half Bridge	5.5 V	3 V		Internal Oscillator Watchdog Timer	500 mOhm	ESD Over Temperature UVLO	Power MOSFET		1 A
Analog Devices Inc./Maxim Integrated MAX256ASA/V+T	Transformers	Surface Mount	3 V	5.5 V	Inductive	0.154 in	8-SOIC 8-SOIC-EP	Exposed Pad	3.9 mm	Logic	-40 °C	150 °C	2	Half Bridge	5.5 V	3 V	Automotive	Internal Oscillator Watchdog Timer	500 mOhm	ESD Over Temperature UVLO	Power MOSFET	AEC-Q100	1 A
Analog Devices Inc./Maxim Integrated MAX256EVKIT+																								Fully Populated	Board(s)	Isolated	2	2 count	-5 V	5 V	DC/DC Converter	Board	MAX256	5 V	3 V	400 kHz	300 mA
Analog Devices Inc./Maxim Integrated MAX256ASA+T	Transformers	Surface Mount	3 V	5.5 V	Inductive	0.154 in	8-SOIC 8-SOIC-EP	Exposed Pad	3.9 mm	Logic	-40 °C	150 °C	2	Half Bridge	5.5 V	3 V		Internal Oscillator Watchdog Timer	500 mOhm	ESD Over Temperature UVLO	Power MOSFET		1 A

Catalog

3W Primary-Side Transformer H-Bridge Driver for Isolated Supplies

Description

The MAX256 is an integrated primary-side controller and H-bridge driver for isolated power-supply circuits. The device contains an on-board oscillator, protection circuitry and internal FET drivers to provide up to 3W of power to the primary winding of a transformer. The MAX256 can be operated using the internal programmable oscillator or can be driven by an external clock for improved EMI performance. Regardless of the clock source being used, an internal flip-flop stage guarantees a fixed 50% duty cycle to prevent DC current flow in the transformer.The MAX256 operates from a single-supply voltage of +5V or +3.3V, and includes undervoltage lockout for controlled startup. The device prevents cross-conduction of the H-bridge MOSFETs by implementing break-before-make switching. Thermal shutdown circuitry provides additional protection against damage due to overtemperature conditions.The MAX256 is available in the 8-pin thermally-enhanced SO package. The device is specified for the automotive(-40°Cto +125°C) temperature range.ApplicationsIndustrial Process ControlIsolated Communications LinksIsolated Power SuppliesMedical EquipmentTelecommunications