Rainbow-electronics MAX1802 Bedienungsanleitung PDF herunterladen (Seite 4)

MAX1802

Digital Camera Step-Down

Power Supply

4 _______________________________________________________________________________________

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

MAIN SOFT-START

Soft-Start Interval OSC falling edge 1024

OSC

cycles

MAIN DRIVERS (DHM, DLM)

Output Low Voltage I

SINK

= 10mA 0.11 V

Output High Voltage I

SOURCE

= 10mA

VDDM

0.11

Driver Resistance I

DHM

= 10mA, I

DLM

= 10mA 4 11 Ω

Drive Current

Sourcing or sinking,

DHM

or V

= V

VDDM

/ 2

400 mA

CORE DC-DC CONVERTER (V

ONC

= 3V)

Core Output Voltage Adjust

Range

OUT

1.25 5.5 V

Core Idle Mode Threshold V

OSC

= 0.625V 70 190 320 mA

Core Current-Sense Amplifier

Transresistance

CSC

0.7 1.0 1.3 V/A

Core Slope Compensation Gain A

VSWC

0.16 0.20 0.24 V/V

CORE ERROR AMPLIFIER (V

ONC

= 3V)

FBC Regulation Voltage Unity gain configuration, FBC = COMPC 1.233 1.248 1.263 V

FBC to COMPC

Transconductance

Unity gain configuration, FBC = COMPC,

-5µA < I

LOAD

< 5µA

70 100 160 µS

FBC Input Leakage Current V

FBC

= 1.35V 5 100 nA

COMPC Minimum Output

Voltage

FBC

= 1.35V, COMPC open 0.3 V

COMPC Maximum Output

Voltage

COMPM

(

MAX

)

FBC

= 1.15V, COMPC open 2.00 2.14 2.27 V

CORE SOFT-START (V

ONC

= 3V)

Soft-Start Interval 1024

OSC

cycles

CORE POWER SWITCHES (V

ONC

= 3V)

LXC Leakage Current V

LXC

= 0, 5.5V 0.01 20 µA

DSN

N-channel, I

LXC

= 0.75A 150 350

Switch On-Resistance

DSP

P-channel, I

LXC

= 0.75A 180 400

mΩ

P-Channel Current Limit V

OSC

= 0.625V 0.75 A

N-Channel Turn-Off Current 18 100 180 mA

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V

VDDM

= 6V, V

VDDC

= 3V, PGNDM = PGND = GND, DCON1 = REF, V

ONM

= 3V, V

ONC

= V

ON1

= V

DCON2

DCON3

= 0, T

= 0°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

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