LM3281 Description
The LM3281 is a high-efficiency low-noise miniature DC-DC converter optimized for powering noisesensitive wireless connectivity chipsets and RF Front End Modules (FEMs) from a single Lithium-Ion cell. The LM3281 is ideal for “always on” applications with very low unloaded quiescent current of 16 µA (typ.). The LM3281 steps down an input supply voltage to a fixed output voltage of 3.3 V with output current up to 1200...
LM3281 Key Features
- 1 Operates from a Single Li-Ion Cell (3 V to 5.5 V)
- 6-MHz (typ.) PWM Switching Frequency
- Fixed Output Voltage: 3.3 V
- Up to 1.2-A Maximum Load Capability
- High Efficiency: 94% (typ.) with 3.8-V VIN at
- Analog Bypass: 60-mV (typ.) Drop-Out at 600 mA
- Low IQ: 16 µA typical, 25 µA maximum
- Automatic ECO/PWM/Bypass Mode Change
- Forced PWM Mode for Low Output-Voltage Ripple
- Soft-Start Limits Input Current on Start-Up