Analog Devices has added a new device to its family of μModule voltage regulators. The LTM4691 is a complete dual 2 A output switching mode DC/DC power supply in a tiny 3 mm × 4 mm × 1.18 mm LGA package. Included in the package are the switching controller, power FETs, inductors and all supporting components. Operating over an input voltage range of 2.25 V to 3.6 V, the LTM4691 supports two outputs with programmable output voltage range from 0.5 V to 2.5 V set by external resistors. Its high efficiency design delivers up to 2 A continuous current on each output. Only bulk input and output capacitors are needed.
The LTM4691 operates in forced continuous mode for low noise pulse-skipping mode or Burst Mode operation for high efficiency at lights loads. The typical buck switching frequency is 2 MHz and can be synchronized from 1 MHz to 3 MHz. Its high switching frequency and a current mode architecture enables a very fast transient response to line and load changes without sacrificing stability.
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| Типовая схема включения. |
Other features include precision run thresholds, a PGOOD signal, output overvoltage protection, thermal shutdown and output short-circuit protection. The LTM4691 is Pb-free and RoHS compliant.
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| Efficiency vs. Load Current. |
Features
- Tiny Surface Mount, Low Profile 3 mm × 4 mm × 1.18 mm LGA Package
- Input Voltage Range: 2.25 V to 3.6 V
- Dual 2 A DC Output Current
- ±1.5% Total Output Voltage Regulation
- Current Mode Control, Fast Transient Response
- External Frequency Synchronization
- 180° Out-of-Phase Operation
- Selectable Pulse-Skipping Mode/Burst Mode® Operation/Forced Continuous Mode
- Power Good Indicator
- Internal Soft-Start
- Internal Compensation
- Overvoltage, Overcurrent and Overtemperature Protection
Applications
- Telecom, Networking and Industrial Equipment
- Point-of-Load Regulation
- FPGA, ASIC Core Supplies
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| Demonstration circuit 2910A for LTM4691 μModule. |