The TPS61240-Q1 device is a high efficient synchronous step up DC-DC converter optimized
for products powered by either a three-cell alkaline, NiCd or NiMH, or one-cell Li-Ion or
Li-Polymer battery. The TPS61240-Q1 supports output currents up to 450 mA. The TPS61240-Q1 has an
input valley current limit of 500 mA.
TPS61240-Q1 device provides fixed output voltage of 5V-typ with an input voltage range of
2.3 V to 5.5 V and the device supports batteries with extended voltage range. During shutdown, the
load is completely disconnected from the battery. The TPS61240-Q1 boost converter is based on a
quasi-constant on-time valley current mode control scheme.
The TPS61240-Q1 presents a high impedance at the VOUT pin when
shut down. This allows for use in applications that require the regulated output bus to be driven
by another supply while the TPS61240-Q1 is shut down.
During light loads the device will automatically pulse skip allowing maximum efficiency
at lowest quiescent currents. In the shutdown mode, the current consumption is reduced to less than
TPS61240-Q1 allows the use of a small inductor and capacitors to achieve a small solution
size. The TPS61240-Q1 is available in a 2 mm × 2 mm WSON package.