AS1331 300mA Buck-Boost Synchronous DC/DC Converter This special device is a synchronous buck-boost DC/DC General Description converter which can handle input voltages above, below, or equal to the output voltage. Due to the internal structure of the AS1331 which is working continuously through all operation modes this device is ideal for dual or triple cell alkaline/NiCd/NiMH as well as single cell Li-Ion battery applications. Because of the implemented Power Save Mode, the solution footprint and the component count is minimized and also over a wide range of load currents a high conversion efficiency is provided. The device includes two N-channel MOSFET switches and two P-channel switches. Also following features are implemented: a quiescent current of typically 22A (ideal for battery power applications), a shutdown current less than 1A, current limiting, thermal shutdown and output disconnect. The AS1331 is available in a 10-pin 3x3mm TDFN package with fixed and adjustable output voltage. Ordering Information and Content Guide appear at end of datasheet. Key Benefits & Features The benefits and features of AS1331, 300mA Buck-Boost Synchronous DC/DC Converter are listed below: Figure 1: Added Value of Using AS1331 Benefits Features Ideal for single Li-Ion battery powered Input voltage range: 1.8V to 5.5V applications Output voltage range: 2.5V to 3.3V Supports a variety of end applications Output current: 300mA 3.3V Automatic transition between buck and boost mode Short-circuit protection Built-in self-protection Overtemperature protection Output disconnection in shutdown Small system area 10-pin 3x3mm TDFN package ams Datasheet Page 1 v1-06 2015-Dec-07 Document FeedbackAS13 31 Gene ral Des c rip t ion Applications The AS1331 is an ideal solution for handheld computers, handheld instruments, portable music players and PDAs. Two and three cell Alkaline, NiCd or NiMH or single cell Li battery powered products. Block Diagram The functional blocks of this device are shown below: Figure 2: Typical Application Diagram L1 6.8H 4 SW1 2 SW2 1.8V to 5.5V Low Battery Detect 5 8 VIN LBO R3 C1 R4 10F 1 7 VOUT AS1331-AD 2.5V to 3.3V LBI VOUT C2 R5 R1 22F 10 6 On Off FB EN R2 PGND 3 9 GND Page 2 ams Datasheet Document Feedback v1-06 2015-Dec-07