Rainbow-electronics AT73C246 Manual de usuario descargar pdf (Pagina 14)

11050A–PMAAC–07-Apr-10

AT73C246

9.4 DCDC0 and DCDC1

Unless otherwise specified: External components L=2.2μH, C

OUT

=22μF and C

=10μF. V

IN{0,1}

> V

DD{0,1}

+ 500mV.

= [-40°C ; +125°C].

Table 9-5. DCDC0 and DCDC1 Electrical Characteristics

Symbol Parameter Comments Min Typ Max Units

Operating Supply Voltage V

IN0

, V

IN1

and V

INSYS

2.9 3.6 5.5 V

Supply Current

(1)

OFF - - 1 µA

PFM operation.

DD0

= 1.85V, V

DD1

= 1.2V

40 80 µA

PWM operation.

DD0

= 1.85V, V

DD1

= 1.2V

36.5mA

Output Current

PFM operation. - - 50 mA

PWM operation. - - 600 mA

Switching Frequency PWM operation. 1.8 2 2.2 MHz

DD0

Default Output Voltage

(2)

DD0

-1.85- V

DD1

-1.2- V

DD_RANGE

Programmable Output Voltage

Range

PFM or PWM operation. 0.8 3.6 V

DD_STEP

Output Voltage Steps PFM or PWM operation. 50 mV

STEP

Number of Output Steps

In case of direct output voltage

programming. Automatic ramping

not active.

step /

100µs

STEP

Step time With automatic ramping. 260 280 300 µs

DD_ACC

DC Output Voltage Accuracy

PFM; T

= 25°C ; I

= 0 mA -1.5 2.5

PFM; T

= [-40;125°C] ; I

= 0 mA -2 3

PWM; T

= 25°C ; I

= 0 mA -1.5 1.5

PWM; T

= [-40;125°C] ; I

= 0 mA -2 2

DD_RIPPLE

Ripple Voltage PWM operation. 2 mV

VDD_IL

Static Load Regulation

PWM operation. I

ranging from 0

to I

OMAX

25mV

Dynamic Load Regulation

PWM. I

: 0 to I

OMAX

; 1μs rise time -40

PWM. I

: I

OMAX

to 0 ; 1μs fall time 40

VDD_VIN

Static Line Regulation

IN0

and V

INSYS

from 2.9 to 5.5V

DD0

= 1.85V, V

DD1

= 1.2V

5mV

Eff Efficiency

PWM. I

OMAX

load. V

DD0

= 1.85V.

Relative to V

IN0

input supply.

85 %

PWM. I

OMAX

load. V

DD1

= 1.2V.

Relative to V

IN1

input supply.

78 %

INRUSH

Inrush Current

(1)

Current from V

IN(0,1)

and V

INSYS

from 0 to 100% V

DD{0,1}

DD0

= 1.85V, V

DD1

= 1.2V

30 200 mA

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 158 159

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