Rainbow-electronics MAX849 Bedienungsanleitung PDF herunterladen (Seite 5)

MAX848/MAX849

1-Cell to 3-Cell, High-Power,

Low-Noise, Step-Up DC-DC Converters

_______________________________________________________________________________________

Typical Operating Characteristics

= +25°C, unless otherwise noted.)

100

0.1 1 10 100 1000

MAX849

EFFICIENCY vs. LOAD CURRENT

OUT

= 3.3V)

MAX848/9 TOC-01

LOAD CURRENT (mA)

EFFICIENCY (%)

= 2.4V

PFM

PWM

= 0.9V

= 1.2V

100

0.1 1 10 100 1000

MAX849

EFFICIENCY vs. LOAD CURRENT

OUT

= 5V)

MAX848/9 TOC-02

LOAD CURRENT (mA)

EFFICIENCY (%)

= 1.2V

= 2.4V

= 3.6V

PFM

PWM

0.1 1 10 100 1000

MAX848

EFFICIENCY vs. LOAD CURRENT

OUT

= 3.3V)

MAX848/9 TOC-03

LOAD CURRENT (mA)

EFFICIENCY (%)

100

= 2.4V

= 1.2V

= 0.9V

PFM

PWM

0 2 31 4 6

NO-LOAD BATTERY CURRENT

vs. INPUT VOLTAGE

MAX848/9 TOC-04

INPUT VOLTAGE (V)

INPUT CURRENT (mA)

= +85°C

= +25°C

= -40°C

1.252

1.248

-40 0

-20

20 60 10080

REFERENCE VOLTAGE

vs. TEMPERATURE

1.249

1.251

MAX848/9 TOC-07

TEMPERATURE (°C)

REFERENCE VOLTAGE (V)

1.250

0 21 3 65

SHUTDOWN CURRENT

vs. INPUT VOLTAGE

MAX848/9 TOC-05

SHUTDOWN CURRENT (µA)

= +85°C

= +25°C

= -40°C

INCLUDES ALL EXTERNAL

COMPONENT LEAKAGES.

CAPACITOR LEAKAGE

DOMINATES AT

= +85°C

INPUT VOLTAGE (V)

2.0

1.8

1.6

0.6

0.01 0.1 1 10 100 1000

START-UP VOLTAGE vs. LOAD CURRENT

OUT

= 3.3V, PWM MODE)

0.8

MAX848/9 TOC-06

LOAD CURRENT (mA)

START-UP VOLTAGE (V)

1.0

1.2

1.4

= +85°C

= +25°C

= -40°C

1.252

1.238

0 2010 30 50 60 70 80

REFERENCE VOLTAGE

vs. REFERENCE CURRENT

1.242

1.250

MAX848/9 TOC-08

REFERENCE CURRENT (µA)

REFERENCE VOLTAGE (V)

1.246

1.240

1.248

1.244

0.25

-0.25

0.1875 0.68750.4375 0.9375

ADC LINEARITY ERROR

vs. FULL-SCALE INPUT VOLTAGE

0.15

MAX848/9 TOC-09

FULL-SCALE INPUT VOLTAGE (V)

LINEARITY ERROR (%FS)

-0.15

0.05

-0.05

AIN1

AIN2

1 2 3 4 5 6 7 8 9 10 ... 15 16

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