TPS60310DGSR

The TPS6031X step-up, regulated charge pumps generate a 3-V ±4% or 3.3-V ±4% output voltage from a 0.9-V to 1.8-V input voltage (one alkaline, NiCd, or NiMH battery). Output 1 (OUT1) can deliver a maximum of 40 mA, from a 1-V input, with output 2 (OUT2) not loaded. OUT2 can deliver a maximum of 20 mA, from a 1-V input, with OUT1 not loaded. Both outputs can be loaded at the same time, but the total output current of the first voltage doubler must not exceed 40 mA. For example, the load at OUT1 is 20 mA and the load at output 2 is 10 mA. In snooze mode, the devices operate with a typical operating current of 2 μA, while the output voltage is maintained at 3.3 V ±10% or 3 V ±10%, respectively. This is lower than the self-discharge current of most batteries. Load current in snooze mode is limited to 2 mA. If the load current increases above 2 mA, the output voltage drops further and the devices automatically exits the snooze mode and operate in normal mode to regulate to the nominal output voltage with higher output currents. The device is set into the snooze mode by taking the SNOOZE pin low, and is set into normal operating mode by taking the SNOOZE pin high. A power-good function supervises the output voltage of OUT2 and can be used for power up and power down sequencing. Power-good (PG) is offered as either open-drain or push-pull output. The TPS6031X charge pumps are voltage quadruplers that provide a regulated 3.3-V or 3-V output from a 0.9-V to 1.8-V input. They deliver a maximum load current of 20 mA. Designed specifically for space critical battery powered applications, the complete converter requires only five external capacitors and enables the design to use low-cost, small-sized, 1-μF ceramic capacitors. The TPS6031X circuits consist of an oscillator, a voltage reference, an internal resistive feedback circuit, two error amplifiers, two charge pump stages with MOSFET switches, a shutdown/start-up circuit, and a control circuit. The devices contain a circuit which dramatically reduces the quiescent current at light loads. This so called snooze mode must be enabled by pulling the SNOOZE pin low. When the output current decreases below the snooze mode threshold, the device enters the snooze mode. In snooze mode, the main error amplifier with 4% error and 50-μA supply current is disabled and a 10%, 2-μA regulator controls the output voltage.

Applications

• Pagers
• Battery-Powered Toys
• Portable Measurement Instruments
• Home Automation Products
• Medical Instruments (Like Hearing Instruments)
• Metering Applications Using MSP430 Microcontroller
• Portable Smart Card Readers

Key features

• Regulated 3-V or 3.3-V Output Voltage With up to 20-mA Output Current From a 0.9-V to 1.8-V Input Voltage Range
• High Power Conversion Efficiency (up to 90%) Over Wide Output Current Range, Optimized for 1.2-V Battery Voltage
• Snooze Mode for Improved Efficiency at Low-Output Current
• Additional Output With 2 Times VIN (OUT1)
• Device Quiescent Current Less Than 2 μA
• Supervisor Included; Open Drain or Push-Pull Power Good Output
• No Inductors Required/Low EMI
• Only Five Small, 1 μF Ceramic Capacitors Required
• Microsmall 10-Pin MSOP Package