TEA1202TS

The TEA1202TS is a fully integrated battery power unit including a high-efficiency DC/DC converter which runs from a 1-cell NiCd or NiMH battery, two low dropout voltage regulators and a low battery detector. The circuit can be arranged in many ways to optimize the application circuit of a power supply system. Therefore, most inputs and outputs are separated, the DC/DC converter can be arranged for upconversion or downconversion and the regulators can also be used as power switches. One regulator can be used completely independent of the rest of the system, and the low battery detector can be configured for several types of batteries. Accurate low battery detection is possible while all other blocks are switched off.

The TEA1202TS DC/DC converter features efficient, compact and dynamic power conversion using a digital control concept comparable with Pulse Width Modulation (PWM) and Pulse Frequency Modulation (PFM), integrated CMOS power switches with a very low R_DSon and fully synchronous rectification.

The TEA1202TS device operates at a switching frequency of 600 kHz which enables the use of external components with minimum size. The switching frequency can be synchronized to an external high frequency clock signal. Optionally, the device can be kept in PWM control mode only. Deadlock is prevented by an on-chip undervoltage lockout circuit.

Active current limiting enables efficient conversion in pulsed-load systems such as Global System for Mobile communication (GSM) and Digital Enhanced Cordless Telecommunications (DECT).

Both LDOs TEA1202TSshow a low dropout voltage and are inherently stable, even when ceramic capacitors with a low ESR value are applied at the outputs. Usage of the LDOs as low-ohmic switches is also possible.

The low battery detector TEA1202TS has a built-in detection level which is optimum for a 1-cell NiCd or NiMH battery. Higher battery voltages can be translated to this 1-cell level by an additional built-in LDO circuit.