Rainbow-electronics MAX8720 Manual do Utilizador descarregar pdf (Página 5)

MAX8720

Dynamically Adjustable 6-Bit VID

Step-Down Controller

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, V+ =15V, SHDN = SKIP = V

= V

= +5V, V

OUT

= 1.25V, T

= -40°C to +85°C, unless otherwise noted.

Typical values are at T

= +25°C.) (Note 4)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

UNITS

PWM CONTROLLER

Battery Voltage, V+ 2 28

Input Voltage Range

, V

4.5 5.5

DAC codes from 0.9V

to 1.85V

-1 +1 %

DAC codes from

0.45V to 0.875V

-15

+15

DC Output Voltage Accuracy

V+ = 4.5V to 28V,

includes load

regulation error

DAC codes from

0.275V to 0.425V

-18

+18

FB Input Resistance

115

265 kΩ

150kHz, R

TIME

= 120kΩ -8 +8

818kHz, R

TIME

= 22kΩ -12

+12

TIME Frequency Accuracy

38kHz, R

TIME

= 470kΩ -12

+12

V+ = 5V, FB = 1.25V, TON = GND

(1000kHz)

230

290

TON = REF

(550kHz)

165

215

TON = open

(300kHz)

320

390

On-Time (Note 2) t

V+ = 12V,

FB = 1.25V

TON = V

(200kHz)

465

565

TON = V

, open, or REF (200kHz, 300kHz,

or 550kHz)

500

Minimum Off-Time (Note 2)

OFF

(

MIN

)

TON = GND (1000kHz) 375

BIAS AND REFERENCE

Quiescent Supply Current (V

FB forced above their regulation points

1300

µA

Quiescent Supply Current (V

FB forced above their regulation points 5 µA

Quiescent Battery Supply

Current (V+)

40 µA

Shutdown Supply Current (V

SHDN = GND 25 µA

Shutdown Supply Current (V

SHDN = GND 5 µA

Shutdown Battery Supply

Current (V+)

SHDN = GND, V

= V

= 0V or 5V 5 µA

Reference Voltage V

REF

= 4.5V to 5.5V, no REF load

1.98 2.02

FAULT DETECTION

Undervoltage-Lockout

Threshold

Rising edge, hysteresis = 20mV, PWM

disabled below this level

4.1 4.4 V

1 2 3 4 5 6 7 8 9 10 ... 30 31

Step-Down Controller 1

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