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POL (Point Of Load conversion)
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Overview
A POL (Point Of Load) converter is a step-down DC-DC converter positioned close to a processor which consumes power. POL converters are used in many power supply systems. They offer the advantage that by placing the final-stage power supply (POL) near to the load, it is possible to eliminate the long wiring between power supply and load found in conventional power supply systems. This enables a precise voltage supply while meeting low-voltage and large-current requirements.
In addition, the power supply impedance is reduced, which in turn minimizes the interference between different voltages and unwanted electromagnetic radiation. The power supplies of large servers consist of three main sections; a block which converts external AC into DC; a block which boosts the power efficiency, and a POL block. The POL converts the DC (12 V, 24 V, or 48 V) distributed to each PCB to the voltage required by each individual circuit block in the system.
Renesas offers an extensive flexible lineup of solutions for POL applications, including implementations of pulse width modulation (PWM) controllers and switching devices in SiP (system in package), and discrete products.
System Block Diagram
Recommended Products
| Block | Semiconductor device | Recommended products | Features, etc. |
|---|---|---|---|
| SiP solution | SiP | R2J20702NP | High current: Supports 40 A output DC/DC converter Two-phase control, current share, simultaneous control, Easy to implement tracking start-up High efficiency: 92.5% @Vin = 12 V, Vout = 1.8 V, Fsw = 500 kHz Fast load transient response: Output voltage fluctuation under 40 mV thanks to use of peak current mode Other: Overcurrent protection function (Hiccup) |
| R2J20751NP | Supports high current output (25A) Supports wide range of input: 3.3V to 27V 0.6V, 2% high-precision reference supply voltage on-chip Wide range of frequency settings: 200kHz to 1MHz Peak current control using active current sensing circuit Multiphase operation Built-in auto-phase control comparator Built-in boot switch for bootstrap Built-in hiccup circuit for overcurrent protection | ||
| PWM controller + SiP solution | Driver-MOSFET | R2J20605ANP | High-speed high-efficiency operation, small package |
| R2J20653ANP | |||
| R2J20654NP | |||
| Discrete solution | PWM controller | HA16167AT | Vin = 4.5 to 14.5 V, f = 1 MHz, external MOSFET |
| Power MOSFET | RJK0389DPA | High-side 30 V/15 A, low-side 30 V/20 A SBD |
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