Dual-Phase Boosts Step-Up Efficiency

Linear Technology Corp. recently introduced the LTC3124 two-phase, 3-MHz current-mode synchronous boost DC/DC converter. It features output disconnect and inrush current limiting. Dual-phase operation has the benefit of reducing peak inductor and capacitor ripple currents. This allows equivalent performance to be achieved in the power supply design with smaller valued inductors and capacitors.

Source: Linear Technology

Source: Linear Technology

The LTC3124 incorporates low resistance MOSFETs with an RDS(ON) of 130mΩ (N-channel) and 200mΩ (P-channel) to deliver efficiencies as high as 95%. The output disconnect feature allows the output to be completely discharged at shutdown and reduces switch-on inrush. An input pin can be used to configure the LTC3124 for continuous frequency mode to give low-noise operation. Additional features include external synchronization, output overvoltage protection, and robust short-circuit protection.

LTC3124′s main features:

  •  VIN Range: 1.8 V to 5.5 V, 500 mV after start-up
  •  Adjustable output voltage: 2.5 V to 15 V
  •  1.5-A Output current for VIN = 5 V and VOUT = 12 V
  •   Dual-phase control reduces output voltage ripple
  •  Output disconnects from input when shut down
  •  Synchronous rectification: up to 95% efficiency
  •  Inrush current limit
  •  Up to 3-MHz programmable switching frequency synchronizable to external clock
  •  Selectable Burst Mode operation: 25-µA IQ
  •  Output Overvoltage Protection
  •  Internal soft-start
  •  < 1 µA IQ in shutdown

The LTC3124EDHC and LTC3124EFE are both available from stock in 16-lead 3 mm x 5 mm DFN and thermally enhanced TSSOP packages, respectively. One-thousand-piece pricing starts at $3.26 each.

[via Elektor]

Low-Cost 6-W DC-DC converters

XPThe JCE06 and JTE06 series of low-cost compact 6-W DC-DC converters are designed for a range of mobile communications and industrial and transportation applications. The converters are constructed from a plastic industry-standard 24-pin DIP through-hole mounting package. They measure 1.25“ × 0.80“ × 0.4“  (31.75 mm × 20.32 mm × 10.40 mm). The single- and dual-output units achieve a power density of 15 W per inch3 and up to 84% efficiency.

Single-output models are available with 3.3, 5, 12, 15, or 24 VDC outputs. Dual-output models provide ±3.3, ±5, ±12, ±15, or ±24 VDC outputs. The JCE06 accommodates a wide 2:1 input range. The JTE06 series is designed for an ultra-wide 4:1 input range. All models cover the popular nominal input 12-, 24-, or 48-VDC voltages.

Input-to-output isolation is 1,500 VDC across the range. The converters suit a range of operating environments in temperatures from –40°C to 100°C. No additional forced airflow or heatsinking is required, which saves valuable board space and extra cost.

An under-voltage input protection feature shuts down the converter below a set voltage to prevent damage to the converter. All models within both ranges meet EN55022 Class A conducted EMC emissions without any additional components.

Pricing for the single-output JCE06 series starts at $13.85 in 500-unit quantities. Pricing for the JTE06 series starts at $14 in 500-unit quantities.

XP Power, Ltd.
www.xppower.com