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L8202

4

DC/DC CONVERTERS SPECIFICATION

L8202 contains 2 DC/DC converters.

VCC converter is programmable by the Vcc_Select pin for an Output Voltage rated at 3.3V or 5V (1.2A

max.). VDD voltage is programmable by a resistor divider network to voltages from +3V to +17V.

The switching frequency of the two converters is 200KHz.

The Vcc and the VDD regulators are protected by thermal protection circuit with thermal hysteresys (Out-

put Voltages are switched off during thermal protection event). The output voltages, Vcc and VDD are

short circuit protected.

4.1 VCC Regulator

4.2 VDD Regulator

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Vcc Regulator Output Voltage.

Vcc value selected by Vcc_select

pin.

Vcc = 3.3V From 10mA to 1.2A

Vcc = 5V From 10mA to 1.2A

3.23

4.90

3.3

5

3.37

5.20

V

V

Over current Threshold level

1.6

4.8

A

Blankig time for overcurrent

detect

400

ns

Vcc external load current

10

1200

mA

Operating frequency

175

200

225

KHz

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VDD Regulator Output Voltage

range

24V

≤ Vs ≤ 38V

3

17

V

Vref

Internal reference voltage for error

amp

-2%

1.24

+2%

V

Vcc external load current

0.01

3.0

A

Over current detect level

During start up

2.0

3.2

A

Over current detect level

During short circuit

4.0

5.5

A

Current sense voltage

Using external Power DMOS,

this is a voltage of Ext. resistor

between Vs and VDD_source

-20%

250

+20%

mV

Blankig time for overcurrent detect

300

ns

Gate to source clamp voltage

Vs-15

Vs-10

V

Transient time after which max load

can be applied to VDD regulator

Vs high, ASIC receives

command to turn on VDD Reg

75

ms

Maximum load current appliable

during start up.

1.2

A

Operating Frequency

175

200

225

KHz