MAS3587F datasheet(76/82 Pages) MICRONAS

76 / 82 page

MAS 3587F

ADVANCE INFORMATION

Micronas

4.6.5. DC/DC Converter Characteristics

at TA = TA2, Vin = 1.2 V (unless otherwise noted), Voutn = 3.0 V, fclk = 18.432 MHz, fsw = 384 kHz,

Typ. values for TA = 25 °C

Symbol

Parameter

Pin Name

Min.

Typ.

Max.

Unit

Test Conditions

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

2.88

3.12

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

0.8

%/V

dVOUT/

VOUT

Load regulation

DC1

DC2

VSENS1

VSENS2

−1.7

−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 2.9.2. on

page 11)

fstartup

Switching frequency during

start-up

DCSOn

250

kHz

VSENSn < 1.9 V

IsupPFM1

Supply current in PFM mode

VSENS1

µA

IsupPFM2

VSENS2

135

IsupPWM1

Supply current in PWM mode

VSENS1

265

µA

VSENSn

IsupPWM2

VSENS2

325

Ilnmax

NMOS switch current limit

(low side switch)

DCSOn,

DCSGn

Ilptoff

PMOS switch turnoff current

(rectifier switch)

DCSOn,

VSENSn

ILEAK

leakage current

DCSOn,

DCSGn

0.1

µAT

j = 25 °C, converter off,

ILOAD =0 µA

1) Current into VSENSn. VIN > VOUT+

∆V; (∆V≈0.4 V); no DC/DC-Converter regulation switching action present

2) Add. current of oscillator at PIN AVDD0/1, (see Section 4.6.4. on page 72)

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