POWER AND LINEAR IC SOLUTIONS

PWM Control ICs Suit High Performance Synchronous Buck DC-DC Converters

International Rectifier has introduced two dual channel synchronous buck converter control ICs with integrated high performance drivers. The devices are suitable for the delivery of medium-to-high currents in Point-of-Load (PoL) architectures in networking, computing, and communications systems.



The IR3622MPbF and IR3622AMPbF can be configured to support a single output in current share mode, capable of delivering up to 80A, or to support two independent outputs. The independent channels run 180° out of phase, and reduce the required input capacitance requirement. A significant reduction in output ripple voltage is achieved in single output mode.

The IR3622MPbF is aimed at 12V single input applications while the IR3622AMPbF can support 5V and 12V applications. Key protection features include selectable hiccup or latched current limit, pre-bias start-up, thermal shutdown protection, and Under- and OverVoltage Protection (UVP/OVP).

The devices feature a programmable switching frequency of up to 600kHz, reducing input and output filtering requirements, and minimising the size and number of external filter capacitors and inductors needed. Available in 32-lead (Micro Leadframe Package Quad (MLPQ), the new ICs also feature two independently programmable soft-start functions to allow system level sequencing of output voltages in various configurations critical for system level start-up.

The IR3622 family is well suited to multi-rail applications that require sophisticated power-up and power-down tracking and sequencing of multiple rails by offering a combination of track, sequencing, enable, and 'power good' output features that can be used to trigger a sequential rise of output voltages across multiple PoL converters.

Two reference designs are available: the IRDC3622S for single output (dual phase) and the IRDC3622D for dual output.

IR3622 Specification Table

Part Number	Package	Vin Max (V)	Vin Min (V)	Vout Max (V)	Vout Min (V)	I Max (A)
IR3622MPbF	32L MLPQ	14.5	7.5	Vcc 0.84	0.8	80
IR3622MTRPbF	32L MLPQ	14.5	7.5	Vcc 0.84	0.8	80
IR3622AMPbF	32L MLPQ	14.5	4.5	Vcc 0.84	0.8	80
IR3622AMTRPbF	32L MLPQ	14.5	4.5	Vcc 0.84	0.8	80

Features

• Two dual synchronous controllers with 180° out-of-phase operation
• Two independent outputs or current sharing
• Up to 80A current
• 12V/5V selectable and 5V-only options
• Output voltage tracking
• Power up and power down sequencing
• 1% accurate reference voltage
• Programmable switching frequency up to 600kHz
• Programmable OverCurrent Protection (OCP)
• Programmable enable input
• Pre-bias start up
• Dual power good outputs
• On board regulator
• External frequency synchronisation
• Thermal protection
• 32-terminal 5mm x 5mm MLPQ

Applications

• Point of load architectures
• Networking equipment
• Servers
• Communications systems

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