Rainbow-electronics MAX17000 Manual do Utilizador descarregar pdf (Página 6)

MAX17000

Complete DDR2 and DDR3 Memory

Power-Management Solution

6 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS

= 12V, V

= V

SHDN

= V

REFIN

= 5V, V

CSL

= 1.8V, STDBY = SKIP = AGND, T

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

(Note 1)

PARAMETER SYMBOL CONDITIONS MIN MAX UNITS

PWM CONTROLLER

326

Input Voltage Range

, V

4.5 5.5

FB = AGND 1.485 1.520

FB = V

1.782 1.820Output Voltage Accuracy V

CSL

= 4.5V to 26V,

SKIP = V

FB = Adj 0.990 1.020

TON

= 96.75kΩ

(600kHz), 167ns

nominal

-15 +15

TON

= 200kΩ

(300kHz), 333ns

nominal

-10 +10

On-Time Accuracy (Note 2) t

= 12V,

CSL

= 1.2V

TON

= 303.25kΩ

(200kHz), 500ns

nominal

-15 +15

Minimum Off-Time t

OFF

(

MIN

)

(Note 2) 350 ns

FB forced above 1.0V (PWM, VTT, and

VTTR blocks); STDBY = V

4mA

Quiescent Supply Current (V

FB forced above 1.0V (ultra-skip and

VTTR blocks); STDBY = AGND

475 μA

LINEAR REGULATOR (VTT)

VTTI Input Voltage Range V

VTTI

1.0 2.8 V

VTTI Supply Current I

VTTI

VTTI = 2.8V, REFIN = 1.4V, no load 50 μA

REFIN Range V

REFIN

0.5 1.5 V

REFIN Disable Threshold

0.3

H i g h- si d e on- r esi stance ( sour ce, I

V T T

= 0.1A) 0.25

VTT Internal MOSFET

Low-side on-resistance (sink, I

VTT

= 0.1A) 0.36

VTT Load Regulation -50μA to -1A ≤ I

VTT

≤ +50μA to +1A 17 mV/A

1 2 3 4 5 6 7 8 9 10 11 ... 30 31

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