- V OUT = 0.7V ADJ (min), 1.2, 1.5, 1.6, 1.8, 1.875, 2.5, 3.3V
- 2.5V 5.5V
- 15μA (typical) quiescent current
- Maximum load capacity of 350 mA
- PWM Fixed Switching Frequency of 1 MHz (Typical)
- Automatic PFM/PWM mode switching
- and a fixed output voltage adjustable version is available
- SOT23 - 5 package
- Low drop operation - 100% duty cycle mode
- Efficient internal synchronous rectification
- Internal soft start
- 0.1μA (typical) shutdown current
- Operates from a single lithium-ion battery or 3 NiMH/Nicadmium batteries
- Only three small external components surface mount (one inductor, two ceramic capacitors)
- Current overload protection
illustrate
The LM3670 step-down DC-DC converter is optimized for ultra-low voltage circuitry powered from a single lithium-ion battery or 3 NiMH/NiCd batteries. It provides up to 350 mA of load current over input voltages from 2.5V to 5.5V. Several different fixed output voltages are available, as well as an adjustable output voltage version (see ordering information).
The device offers superior functionality and the performance of sophisticated power management systems in mobile phones and similar portable applications. Intelligent PWM Low Noise and PFM Low Current modes automatically switch to provide improved system control. Fixed frequency of 1 MHz (typical) during full power operation. PWM mode[Similar_To] 70 mA to 350 mA maximum drive load with up to 95% efficiency. Hysteresis PFM mode extends battery life by reducing quiescent current to 15μA (typical) current at light loads and system standby. Internally synchronous rectification (1 mA and 100 mA loads provide 90 to 95 percent typical.) High efficiency. In shutdown mode (enable pin pulled down), the device shuts down, reducing power consumption to 0.1μA (typical).
The LM3670 is a SOT23-5 package. - 1 MHz (typical) - High switching frequency allows for the use of tiny surface-mount components. Only three external surface mount components, an inductor and two ceramic capacitors, are required.
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- mobile phone
- handheld
- handheld computer
- handheld computer
- Portable instrument
- Battery-powered devices
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