Texas Instruments LM3668
The LM3668 is a synchronous buck-boost DC-DC converter optimized for powering low voltage circuits from a Li-Ion battery and input voltage rails between 2.5 V and 5.5 V. It has the capability to support up to 1-A output current over the output voltage range. The LM3668 regulates the output voltage over the complete input voltage range by automatically switching between buck or boost modes depending on the input voltage.| Part No. | LM3668 |
|---|---|
| Datasheet | LM3668 Download |
| Manufacturer |  Texas Instruments |
| Description | High-Efficiency Dual-Mode Single-Inductor Buck-Boost DC-DC Converter |
| Buy | Stock & Price |
FEATURES
●1 45-µA Typical Quiescent Current● For 2.8-V-3.3-V and 3-V-3.4-V Versions: – 1-A Maximum Load Current for VIN = 2.8 V to 5.5 V – 800-mA Maximum Load Current for VIN = 2.7 V – 600-mA Maximum Load Current for VIN = 2.5 V
● For 4.5 V-5 V – 1-A Maximum Load Current for VIN = 3.9 V to 5.5 V – 800-mA Maximum Load Current for VIN = 3.4 V to 3.8 V – 700-mA Maximum Load Current for VIN = 3 V to 3.3 V – 600-mA Maximum Load Current for VIN = 2.7 V to 2.9 V
● 2.2-MHz PWM Fixed Switching Frequency (Typical)
● Automatic PFM-PWM Mode or Forced PWM Mode
● Wide Input Voltage Range: 2.5 V to 5.5 V
● Internal Synchronous Rectification for High Efficiency
● Internal Soft Start: 600-µs Maximum Start-Up Time After VIN Settled
● 0.01-µA Typical Shutdown Current
● Current Overload and Thermal Shutdown Protection
● Frequency Sync Pin: 1.6 MHz to 2.7 MHz Typical Application Circuit VIN = 2.5V - 5.5V C1 10 2F 2.2 2H VDD SW1 PVIN VOUT LM3668 FB SW2 SYNC/MODE EN VSEL NC SGND PGND L = 2.8V H = 3.3V 2.8V/...
