Features: 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-A Quiescent Supply Current
Easy-to-Design, Low Cost, Low EMI Power Supply Since No Inductors Are Used
0.05-A 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)Application 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 InstrumentsPinout
SpecificationsVoltage range: IN, OUT, EN, LBI, LBO, PG to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to 3.6 V
C1+, C2+ to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to (VO + 0.3 V)
C1, C2 to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to (VI + 0.3 V)
Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See dissipation rating table
Continuous output current TPS60204, TPS60205 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 mA
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55°C to 150
Maximum junction temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
† Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other onditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
DescriptionThe TPS60205 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 of TPS60205 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 TPS60205 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 of TPS60205 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 of TPS60205 can be controlled and minimized. The TPS60205 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 TPS60205 requires no inductors, therefore, EMI of the system is reduced to a minimum. It is available in the small 10-pin MSOP package (DGS).
TPS60205 Data Sheet
