●The TPS6020x step-up, regulated charge pumps generate a 3.3-V ±4% output voltage from a 1.8-V to 3.6-V input voltage. The devices are typically powered by two Alkaline, NiCd, or NiMH battery cells and operate down to a minimum supply voltage of 1.6 V. Continuous output current is a minimum of 100 mA from a 2-V input. Only four external capacitors are needed to build a complete low-ripple dc/dc converter. The push-pull operating mode of two single-ended charge pumps assures the low output voltage ripple, as current is continuously transferred to the output.
●The devices operate in the newly developed LinSkip mode. In this operating mode, the device switches seamlessly from the power saving pulse-skip mode at light loads to the low-noise constant-frequency, linear-regulation mode once the output current exceeds the LinSkip threshold of about 7 mA. Even in pulse-skip mode, the output ripple is maintained at a very low level because the output resistance of the charge pump is still regulated.
●Three operating modes can be programmed using the EN pin. EN = low disables the device, shuts down all internal circuits, and disconnects the output from the input. EN = high enables the device and programs it to run from the internal oscillator. The devices operate synchronized to an external clock signal if EN is clocked; thus, switching harmonics can be controlled and minimized. The devices include a low-battery detector that issues a warning if the battery voltage drops below a user-defined threshold voltage, or a power-good detector that goes active when the output voltage reaches about 90% of its nominal value.
●Device options with either a low-battery or power good detector are available. This dc/dc converter requires no inductors, therefore, EMI of the system is reduced to a minimum. It is available in the small 10-pin MSOP package (DGS).
● Regulated 3.3-V Output Voltage With up to 100-mA Output Current From a 1.8-V to 3.6-V Input Voltage
● Less Than 5-mV(PP) Output Voltage Ripple Achieved With Push-Pull Topology
● Integrated Low-Battery and Power-Good Detector
● Switching Frequency Can Be Synchronized to External Clock Signal
● Extends Battery Usage With up to 90% Efficiency and 35-uA Quiescent Supply Current
● Easy-to-Design, Low Cost, Low EMI Power Supply Since No Inductors Are Used
● 0.05-uA Shutdown Current, Battery is Isolated From Load in Shutdown Mode
● Compact Converter Solution in UltraSmall 10-pin MSOP With Only Four External Capacitors Required
● Evaluation Module Available (TPS60200EVM-145)
● applications
● Replaces DC/DC Converters With Inductors in Battery Powered Applications Like:
● Two Battery Cells to 3.3-V Conversion
● MP3 Portable Audio Players
● Battery-Powered Microprocessor Systems
● Backup-Battery Boost Converters
● PDA"s, Organizers, and Cordless Phones
● Handheld Instrumentation
● Glucose Meters and Other Medical Instruments
