MAX1802 데이터 시트보기 (PDF) - Maxim Integrated

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MAX1802

Digital Camera Step-Down Power Supply

Maxim Integrated 

Digital Camera Step-Down

Power Supply

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, VVDDM = 6V, VVDDC = 3V, PGNDM = PGND = GND, DCON1 = REF, VONM = 3V, VONC = VON1 = VDCON2 =

VDCON3 = 0, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

AUXILIARY DC-DC CONTROLLERS 1, 2, 3 (VON1 = VCON_ = 3V)

INTERNAL CLOCK

OSC Clock Low Trip Level

OSC falling edge

OSC Clock High Trip Level

VDCON _ = 0.625V

VDCON _ = 1.25V to VVL

Maximum Duty Cycle

Adjustment Range

MIN TYP MAX UNITS

0.2 0.25 0.3

V

0.575 0.625 0.675

V

1.00 1.05 1.10

40

90

%

Maximum Duty Cycle

Default Maximum Duty Cycle

DCON_ Input Leakage Current

DCON_ Input Sleep-Mode

Threshold

VDCON _ = 0.625V

VDCON _ = 1.25V to VVL

VDCON _ = 0V to 3V

VDCON _ rising, 50mV hysteresis

43

%

76

%

0.01

1

µA

0.35

0.4

0.45

V

AUXILIARY ERROR AMPLIFIER

FB_ Regulation Voltage

Unity gain configuration, FB_ = COMP_

1.233 1.248 1.263

V

FB_ to COMP_

Transconductance

GEA

Unity gain configuration, FB_ = COMP_,

-5µA < ILOAD < 5µA

70

100 160

µs

FB_ Input Leakage Current

AUXILIARY DRIVERS (DL1, DL2, DL3)

DL_ Driver Resistance

DL_ Drive Current

AUXILIARY SOFT-START

VFB_ = 1.35V

Output high or low

Sourcing or sinking, VDL_ = VVDDC / 2

5

100

nA

4

11

Ω

400

mA

Soft-Start Interval

AUXILIARY SHORT-CIRCUIT PROTECTION

1024

OSC

cycles

Fault Interval

1024

OSC

cycles

_______________________________________________________________________________________ 5

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