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TEA1202TS_00

Battery power unit

Philips Electronics 

Philips Semiconductors

Battery power unit

Objective specification

TEA1202TS

FEATURES

• Fully integrated battery power unit, including complete

DC/DC converter circuit, two Low DropOut voltage

regulators (LDOs) and a battery low detector

• Configurable for 1, 2 or 3-cell Nickel-Cadmium (NiCd)

or Nickel Metal Hybrid (NiMH) batteries and 1 Lithium

Ion (Li-Ion) battery

• Guaranteed DC/DC converter start-up from 1-cell NiCd

or NiMH battery, even with an load current

• Upconversion or downconversion

• Internal power MOSFETs featuring a low RDSon of

approximately 0.1 Ω

• Synchronous rectification for high efficiency

• Soft start

• PWM-only operating option

• Dropout voltage of 75 mV at 50 mA

• Both LDOs are also applicable as low-ohmic power

switches

• Stable LDO performance with ceramic capacitors

• Stand-alone low battery detector requires no additional

supply voltage

• Low battery detection level at 0.90 V, externally

adjustable to a higher level

• Adjustable output voltages

• Shut-down function

• Small outline package

• Advanced 0.6 µm BICMOS process.

APPLICATIONS

• Cellular phones

• Cordless phones

• Personal Digital Assistants (PDAs)

• Portable Audio Players

• Pagers

• Mobile equipment.

GENERAL DESCRIPTION

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 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 RDSon and fully

synchronous rectification.

The 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 show 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 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.

ORDERING INFORMATION

TYPE

NUMBER

TEA1202TS

NAME

SSOP20

PACKAGE

DESCRIPTION

plastic shrink small outline package; 20 leads; body width 4.4 mm

VERSION

SOT266-1

2000 Jun 08

2

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