MAS3549F datasheet(84/92 Pages) MICRONAS

84 / 92 page

MAS 35x9F

DATA SHEET

June 30, 2004; 6251-505-1DS

Micronas

4.6.4. DC/DC Converter Characteristics

at T = TA, Vin =1.2 V, Voutn =3.0 V, fclk = 18.432 MHz, fsw = 384 kHz, PWM mode, L = 22 µH, in P(L/M)QFP pack-

age (unless otherwise noted) Typ. values for TA = 25 °C

XTALKAO

Crosstalk attenuation left/right

channel (headphone)

OUTLR

f = 1 kHz, sine wave,

OUTL/R: RL≥16 Ω

(see Fig. 5–1 on page 89)

analog gain = 0 dB

input =

−3dBFS

PSRRAO

Power supply rejection ratio

for analog audio outputs

AVDD0/1

OUTL/R

1 kHz sine at 100 mVrms

≤100 kHz sine at

100 mVrms

Symbol

Parameter

Pin Name

Limit Values

Unit

Test Conditions

Min.

Typ.

Max.

Symbol

Parameter

Pin Name

Limit Values

Unit

Test Conditions

Min.

Typ.

Max.

VIN

Minimum start-up input

voltage

0.9

ILOAD ≤ 1mA,

DCCF = 5050hex (reset)

VIN

Minimum operating input

voltage

DC1

DC2

0.7

0.8

VILOAD = 50 mA,

DCCF = 5050hex (reset)

DC1

DC2

1.1

1.2

VILOAD = 200 mA,

DCCF = 5050hex (reset)

VOUT

Programmable output voltage

range

VSENSn

2.0

3.5

Voltage settings in DCCF

76hex)

VOTOL

Output voltage tolerance

VSENSn

−4

ILOAD =20mA

TA = 25 °C

ILOAD1

Output current

1 battery cell

VSENSn

200

VIN = 0.9...1.5 V, 330 µF

ILOAD2

Output current

2 battery cells

600

VIN = 1.8...3.0 V, 330 µF

dVOUT/

dVIN/VOUT

Line regulation

VSENSn

0.7

%/V

ILOAD =20mA

dVOUT/

VOUT

Load regulation

VSENSn

−1.8

ILOAD = 20...200 mA,

hmax

Maximum efficiency

VIN =2.4 V, VOUT =3.5 V

fswitch

Switching frequency

DCSOn

297

384

576

kHz

(see Section 2.6.2. on

page 12), (see Table 3–3)

fstartup

Switching frequency during

start-up

DCSOn

250

kHz

VSENSn < 1.9 V

1) Since the regulators are bootstrapped, once started they will operate down to 0.7 V input voltage

2) PFM mode regulates approx. 1% higher

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