1999 Mar 08

8

Philips Semiconductors

Preliminary specification

High efficiency, high current DC/DC converter

TEA1210TS

External synchronization

If an external high-frequency clock is applied to the

synchronization clock input, the switching frequency in

PWM mode will be exactly that frequency divided by 22.

In PFM mode, the switching frequency is always lower.

The quiescent current of the device increases when an

external clock is applied. In case no external

synchronization is necessary, the synchronization clock

input must be connected to ground level.

Behaviour at input voltage exceeding the specified

range

In general, an input voltage exceeding the specified range

is not recommended since instability may occur. There are

two exceptions:

• Upconversion: at an input voltage higher than the target

output voltage, but up to 6 V, the converter will stop

switching. As long as the device is in the PWM mode,

the internal P-type power MOSFET will be conducting

voltage drop. In case the converter is in the PFM mode

at high input voltage, the output voltage will equal

The current limiting function is not active.

• Downconversion: when the input voltage is lower than

the target output voltage, but higher than 2.9 V, the

P-type power MOSFET will stay conducting resulting in

an output voltage being equal to the input voltage minus

some resistive voltage drop. The current limiting

function remains active.

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

Notes

1. Equivalent to discharging a 100 pF capacitor through a 1.5 k

Ω resistor.

2. Equivalent to discharging a 200 pF capacitor via a 0.75

µH inductor.

THERMAL CHARACTERISTICS

QUALITY SPECIFICATION

Product lifetime is fully guaranteed over 2000 hours of operation at an ambient temperature of 60

°C with a continuously

repeating current profile on pins LX of 4 A during 577

µs followed by 1 A during 4.0 ms. All remaining quality

specifications are in accordance with

“SNW-FQ-611 part E”.

SYMBOL

PARAMETER

CONDITIONS

MIN.

MAX.

UNIT

voltage on any pin

shut-down mode

−0.2

+6.5

V

operating mode

−0.2

+5.9

V

junction temperature

−40

+150

°C

operating ambient temperature

−40

+80

°C

storage temperature

−40

+125

°C

electrostatic handling

human body model; note 1

−1500

+1500

V

machine model; note 2

−300

+300

V

SYMBOL

PARAMETER

CONDITIONS

VALUE

UNIT

thermal resistance from junction to ambient

in free air

140

K/W