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Dual Output 20-V, 3-A Switching Regulator Features High and Flat Conversion Efficiency

18th July 2011
ES Admin

Analog Devices’ compact ADP2323 dual synchronous regulator provides greater design flexibility and configurability while reducing system complexity and generating more power conversion efficiency.

Analog Devices introduced the ADP2323, a 20-V, 3-A dual output DC-to-DC regulator featuring a high conversion efficiency of greater than 93 percent. The full featured ADP2323 regulator offers an input voltage supply range of 4.5 V to 20 V and an output range as low as 0.6 V up to 18 V at 1.5 percent voltage accuracy. With more design flexibility and configurability than other DC-to-DC regulators available today, the ADP2323 regulator can be easily configured to synchronise in an evenly phase-shifted topology or for dual-output (2 x 3A) or single interleaved output (up to 6 A). The ADP2323 provides accurate tracking capability between supplies and includes precision-enable input, voltage tracking input and POWER-GOOD features that allow a simple and reliable start-up sequence.

For power designers who need higher efficiency more design flexibility and configurability for multi-rail applications, the ADP2323 surpasses other available DC-to-DC regulators,” said Evaldo Miranda, product line director, Power Management Products Group, Analog Devices. “Unlike other regulators, the ADP2323 enables six output rails in an evenly phase-shifted topology, minimising input current ripple and system interference as well as a power saving mode and current sharing for higher output current capability.

ADP2323 DC-to-DC Regulator Key Features
Dual output (2 x 3 A) and single interleaved output (6 A)
Optional power saving mode improves efficiency at light loads
Synchronisation input and programmable phase shift feature allow up to six output rails configuration in evenly phase-shifted topology minimising input ripple current
Precision-enable input, voltage tracking input and POWER-GOOD feature enables a simple and reliable start-up sequence and short circuit protection
Programmable current limit protects system load closer to its actual power requirement and allows the use of a smaller inductor

The ADP2323’s switching frequency can be programmed between 250 kHz to 1.2 MHz or synchronised to an external clock to minimise interference in multi-rail applications. Both output channels run 180 degrees out of phase and can be synchronised to eliminate beat frequencies between regulators to minimise system noise. The regulator operates from input voltages of 4.5 V to 20 V and the output voltage can be as low as 0.6 V. The two PWM channels can be configured to deliver dual 3-A outputs or a parallel-to-single 6-A output. Designed for high efficiency for multi-rail applications, the ADP2323 operates over the −40 °C to +125 °C junction temperature range and is available in a compact 5 mm x 5 mm QFN-32 lead package.

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