Rainbow-electronics MAX1800 Manual do Utilizador descarregar pdf (Página 4)

MAX1800

Digital Camera Step-Up

Power Supply

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V

OUT

= V

POUT

= 3.3V, PGND = GND, V

ONM

= 3.3V, V

ON1

= V

ON2

= V

ON3

= V

ONA

= 0, T

= -40°C to +85°C,

unless otherwise noted. Typical values are at T

= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ANALOG GAIN BLOCK

AI Feedback Regulation Voltage V

= V

OUT

- 1.25V 1.23 1.25 1.27 V

AI Input Common-Mode Range -0.1 1.3 V

AI Input Current V

= 1.35V 100 nA

AI to AO Voltage Gain 70 100 140 V/V

AO Output Sink Current V

= 1V, V

= 2V 0.5 2.5 mA

AO Output Source Current V

= 1.5V, V

= 2V 0.5 2.5 mA

AO Output Low Voltage V

= 1V, I

SINK

= 25µA 0.5 V

AO Output High Voltage V

= 1.5V or V

ONA

= 0, I

SOURCE

= 25µA

POUT

- 0.5

AI to AO -3dB Bandwidth 5 MHz

AUXILIARY DC/DC CONTROLLERS 1, 2, 3

INTERNAL CLOCK

OSC Clock Low Trip Level Falling edge 0.2 0.25 0.3 V

DCON

= 0.625V 0.575 0.625 0.675

OSC Clock High Trip Level

DCON

= V

OUT

1.00 1.05 1.10

Maximum Duty-Cycle

Adjustment Range

40 90

Maximum Duty Cycle V

DCON

_ = 0.625V 50 %

Default Maximum Duty Cycle V

DCON

_ = 1.25V 84 %

ERROR AMPLIFIER

FB_ Regulation Voltage FB_ = COMP_ 1.23 1.25 1.27 V

FB_ to COMP_

Transconductance

FB_ = COMP_, -5µA < I

LOAD

< +5µA 60 100 140 µS

FB_ to COMP_ Maximum

Voltage Gain

2000 V/V

FB_ Input Leakage Current V

_ = 1.35V 100 nA

DRIVERS (DL1, DL2, DL3)

DL_ Driver Resistance R

Output high or low 2 6 Ω

DL_ Drive Current Sourcing or sinking, V

_ = V

OUT

/2 0.5 A

SOFT-START

Soft-Start Interval 1024

OSC

cycles

SHORT-CIRCUIT PROTECTION

Fault Interval 1024

OSC

cycles

Note 1: Specifications to -40°C are guaranteed by design and not production tested.

Note 2: Operating voltage. Since the regulator is bootstrapped to the output, once started it will operate down to +0.7V input.

Note 3: The regulator is in startup mode until the voltage is reached.

1 2 3 4 5 6 7 8 9 ... 23 24

Digital Camera Step-Up 1
Power Supply 1

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