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TEA1211

High efficiency auto-up/down DC/DC converter

Philips Electronics 

Philips Semiconductors

High efficiency auto-up/down

DC/DC converter

Preliminary specification

TEA1211HN

1 FEATURES

• I2C-bus programmable output voltage range of

1.5 V to 5.5 V

• Single inductor topology

• High efficiency up to 94 % over wide load range

• Wide input range; functional from 2.55 V up to 5.5 V

• 1.7 A maximum input and output current

• Low quiescent power consumption

• 600 kHz switching frequency

• Four integrated very low RDS(on) power MOSFETs

• Synchronizable to external clock

• Externally adjustable current limit for protection and

efficient battery use in case of dynamic loads

• Under voltage lockout

• PWM-only option

• Shut-down current less than 1 µA

• 32-pin small body HVQFN package.

2 APPLICATIONS

• Stable output voltage from Lithium-Ion batteries

• Variable voltage source for PAs (Power Amplifiers) in

cellular phones

• Wireless handsets

• Hand-held instruments

• Portable computers.

3 GENERAL DESCRIPTION

The TEA1211HN is a fully integrated auto-up/down

DC/DC converter circuit with I2C-bus interface. Efficient,

compact and dynamic power conversion is achieved using

a digitally controlled pulse width and frequency modulation

like control concept, four integrated low RDS(on) power

switches with low parasitic capacitances and fully

synchronous rectification.

The combination of auto-up/down DC/DC conversion, high

efficiency and low switching noise makes the TEA1211HN

well suited to supply a power amplifier in a cellular phone.

The output voltage can be I2C-bus programmed to the

exact voltage needed to achieve a certain output power

level with optimal system efficiency, thus enlarging battery

lifetime.

The TEA1211HN operates at 600 kHz switching frequency

which enables the use of small size external components.

The switching frequency can be locked to an external high

frequency clock. Deadlock is prevented by an on-chip

under voltage lockout circuit. An adjustable current limit

enables efficient battery use even at high dynamic loads.

Optionally, the device can be kept in pulse width

modulation mode regardless of the load applied.

4 ORDERING INFORMATION

TYPE

NUMBER

TEA1211HN

NAME

HVQFN32

PACKAGE

DESCRIPTION

plastic thermal enhanced very thin quad flat package; no leads;

32 terminals; body 5 × 5 × 0.85 mm

VERSION

SOT617-3

2003 Oct 13

3

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