Analog Devices announced the Power by Linear™ LTM4661, a low power step-up µModule® regulator in a 6.25 mm × 6.25 mm × 2.42 mm BGA package. Only a few capacitors and one resistor are required to complete the design, and the solution occupies less than 1 cm2 single-sided or 0.5 cm2 on double- sided PCBs. The LTM4661 incorporates a switching DC/DC controller, MOSFETs, inductors and supporting components. The LTM4661 operates from a 1.8 V to 5.5 V input supply, and continues to operate down to 0.7 V after start-up. The output voltage can be set by a single resistor ranging from 2.5 V to 15 V. The combination of the small, thin package and wide input and output voltage range is ideal for wide range of applications including optical modules, battery-powered equipment, battery-based backup systems, bias voltage for power amps or laser diodes and small DC motors.
The LTM4661 can deliver 4 A continuously under 3.3 VIN to 5 VOUT, and 0.7 A continuously under 3.3 VIN to 12 VOUT. The LTM4661 employs synchronous rectification, which delivers as high as 92% conversion efficiency (3.3 VIN to 5 VOUT). The switching frequency is 1 MHz, and can also be synchronized to an external clock ranging from 500 kHz to 1.5 MHz. The LTM4661 1 MHz switching frequency and dual phase single output architecture enable fast transient response to line and load changes and a significant reduction of output ripple voltage. The LTM4661 has three operation modes: Burst Mode® operation, forced continuous mode and external sync mode. The quiescent current in Burst Mode operation is only 25 µA, which provides extended battery run time. For applications demanding the lowest possible noise operation, the forced continuous mode or external sync mode minimize possible interference of switching noise.
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| 5 V/2 A DC/DC Step-Up μModule Regulator. |
The LTM4661 features an output disconnect during shutdown and inrush current limit at start-up. Fault protection features include short-circuit, overvoltage and overtemperature protection.
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| Efficiency vs Output Current at 3.3 V Input. |
The LTM4661 operates from –40 °C to 125 °C operating temperature.
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| Demonstration Circuit 2569A – Ultrathin Step-up μModule Regulator Featuring the LTM4661. |
Summary of Features: LTM4661
- Complete Solution in <1 cm2 (Single-Sided PCB) or 0.5 cm2 (Dual-Sided PCB)
- Input Voltage Range: 1.8 V to 5.5 V, Down to 0.7 V After Start-Up
- Output Voltage Range: 2.5 V to 15 V
- Up to 4 A DC Output Current
- ±3% Maximum Total DC Output Voltage Regulation Over Load, Line & Temperature
- Output Disconnect in Shutdown
- Inrush Current Limit
- External Frequency Synchronization
- Selectable Burst Mode® Operation
- Output Overvoltage & Overtemperature Protection
- Ultrathin 6.25 mm × 6.25 mm × 2.42 mm BGA package
Pricing & Availability
| Product | Production Availability | Price Each Per 1,000 | Package |
| LTM4661 | Now | Starts at $6.98 | 6.25 × 6.25 × 2.42 mm BGA |
