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.
The LM3668 has 2 N-channel MOSFETS and 2 P-channel
MOSFETS arranged in a topology that provides continuous operation through the buck and boost
operating modes. There is a MODE pin that allows the user to choose between an intelligent
automatic PFM-PWM mode operation and forced PWM operation. During PWM mode, a fixed-frequency 2.2
MHz (typical) is used. PWM mode drives load up to 1 A. Hysteretic PFM mode extends the battery life
through reduction of the quiescent current to 45 µA (typical) at light loads during system standby.
Internal synchronous rectification provides high efficiency. In shutdown mode (EN pin pulled low),
the device turns off and reduces battery consumption to 0.01 µA (typical).
A high switching frequency of 2.2 MHz (typical) allows the use of tiny surface-mount
components including a 2.2-µH inductor, a 10-µF input capacitor, and a 22-µF output
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