Rainbow-electronics MAX849 Manual de usuario descargar pdf (Pagina 3)

MAX848/MAX849

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

Low-Noise, Step-Up DC-DC Converters

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

OUT

= 3.6V, GND = PGND = CLK/SEL = ON1 = ON2 = AINSEL = AIN1 = AIN2 = FB = POKIN, POUT = OUT, T

= 0°C to +85°C,

unless otherwise noted.)

Input Low Voltage

1.2V < V

OUT

< 5.5V, ON1 and ON2 (Note 8)

0.2V

OUT

Accuracy

Current into OUT pin, CLK/SEL = GND

OUT

= 2.7V, AINSEL and CLK/SEL

CLK

= 400kHz, 5ms conversion,

monotonic to 8 bits

±4 % FSR

0.2V

OUT

Internal Trip Level

µA

Rising V

OUT

, V

POKIN

< 0.1V 2.95 3.10 V

External Trip Level

Input High Voltage

Rising V

POKIN

1.225 1.275

µA1 2f

CLK

= 400kHz, V

AIN1

= V

AIN2

= 2.5VAIN1, AIN2 Input Current

V0 2.5AINSEL = OUTAIN2 Input Voltage Range

V0.625 1.875AINSEL = GNDAIN1 Input Voltage Range

OUT

- 0.4

Data Output Voltage High

V0.4

SOURCE

= 1mA

Data Output Voltage Low I

SINK

= 1mA

POK Low Voltage

1.2V < V

OUT

< 5.5V, ON1 and ON2 (Note 8)

SINK

= 1mA, V

OUT

= 3.6V or

SINK

= 20µA, V

OUT

= 1V

0.4 V

POK High Leakage Current

0.8V

OUT

= V

POK

= 5.5V 0.01 1 µA

POKIN Leakage Current

POKIN

= 1.5V 50 nA

35 90

OUT

= 5.5V, AINSEL and CLK/SEL 0.8V

OUT

Operating Current in Low-Power

Mode (Note 6)

Logic Input Current

ON1, ON2, AINSEL and CLK/SEL

1 µA

Internal Oscillator Frequency CLK/SEL = OUT 260 300 340 kHz

Oscillator Maximum Duty Cycle 80 85 90 %

External Clock Frequency Range 200 400 kHz

CLK/SEL Pulse Width Not tested 200 ns

CLK/SEL Rise/Fall Time Not tested 100 ns

Current into OUT pin, CLK/SEL = OUT,

does not include switching losses

µA

150 300

UNITS

MIN TYP MAX

CONDITIONSPARAMETER

Operating Current in Low-Noise

Mode (Note 6)

= 0V, V

ON2

= V

OUT

= 5.5V µA0.1 20POUT Leakage Current

= V

ON2

= V

OUT

= 5.5V µA0.1 20LX Leakage Current

N-channel

0.3 0.6

CLK/SEL = GND

0.13 0.25

CLK/SEL = OUT

P-channel

Ω

0.25 0.5

Switch On-Resistance

CLK/SEL = OUT

600 800 1000MAX848

CLK/SEL = OUT

1100 1350 1600MAX849

120 200 300MAX848

CLK/SEL

= 0V (Note 7)

250 400 550

N-Channel Current Limit

MAX849

DC-DC SWITCHES

ADC

POWER-GOOD

LOGIC AND CONTROL INPUTS

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

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Rainbow-electronics MAX849 Manual de usuario Pagina 3

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