Rainbow-electronics MAX1813 Manual do Utilizador descarregar pdf (Página 5)

MAX1813

Dynamically-Adjustable, Synchronous Step-Down

Controller with Integrated Voltage Positioning

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

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

= V

= 5V, VPCS = ZMODE = GND = PGND, SKP/SDN = CODE = V

, V

OUT

set to 1.5V,

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

= +25°C.)

ELECTRICAL CHARACTERISTICS

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

= V

= 5V, VPCS = ZMODE = GND = PGND, SKP/SDN = CODE = V

, V

OUT

set to 1.5V,

= -40°C to +85°C, unless otherwise noted.) (Note 5)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SKP/SDN NO FAULT Input Level 12 15 V

SKP/SDN, 4-Level Logic Input

Current

SKP/SDN, TON, S0, S1 = GND or V

-3 3 µA

PARAMETER SYMBOL CONDITIONS MIN MAX UNITS

PWM CONTROLLER

Battery voltage, V+ 2 28

Input Voltage Range

, V

4.5 5.5

V+ = 4.5V to 28V, VPCS = GND, DAC

codes from 0.925V to 2.0V

-1 +1

V+ = 4.5V to 28V, VPCS = GND, DAC

codes from 0.700V to 0.900V

-1.5 +1.5

DC Output Voltage Accuracy

(Notes 2, 3)

V+ = 4.5V to 28V, VPCS = GND, DAC

codes from 0.600V to 0.675V

-1.83 +1.83

VPCS Input Bias Current I

VPS

VPCS

= 0 or 28V -1 +1 µA

VPS

= 0 to -40mV 18 22

VPCS Transconductance G

VPS

= 0 to -100mV 16.5 22

µS

FB Input Resistance R

115 265 kΩ

380kHz nominal, R

TIME

= 47kΩ -12 +12

150kHz nominal, R

TIME

= 120kΩ -8 +8TIME Frequency Accuracy

38kHz nominal, R

TIME

= 470kΩ -12 +12

ILIM Input Leakage Current I

ILIM

= 0 or 5.0V 100 nA

V+ = 5.0V, V

= 1.2V TON = GND 250 290

TON = REF 165 215

TON = open 320 390

On-Time (Note 4) t

V+ = 12V, V

= 1.2V

TON = V

465 563

TON = REF, open, or V

500

Minimum Off-Time (Note 4) t

OFF

(

M IN

)

TON = GND 375

BIAS AND REFERENCE

Quiescent Supply Current (V

Measured at V

, FB forced above the

regulation point

2.5 mA

Quiescent Supply Current (V

Measured at V

, FB forced above the

regulation point

5 µA

Quiescent Supply Current (V+) I+ Measured at V+ 40 µA

Shutdown Supply Current (V

) SKP/SDN = GND 5 µA

Shutdown Supply Current (V

) SKP/SDN = GND 5 µA

1 2 3 4 5 6 7 8 9 10 ... 37 38

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