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MAX8550
(Rev.:2004)

Integrated DDR Power-Supply Solutions for Desktops, Notebooks, and Graphic Cards

Maxim Integrated 

Integrated DDR Power-Supply Solutions for

Desktops, Notebooks, and Graphic Cards

ELECTRICAL CHARACTERISTICS (continued)

(VIN = +15V, VDD = AVDD = VSHDNA = VSHDNB = VBST = VILIM = 5V, VOUT = VREFIN = VVTTI = 2.5V, UVP/OVP = STBY = FB = SKIP

= GND, PGND1 = PGND2 = LX = GND, TON = OPEN, VVTTS = VVTT, TA = -40°C to +85°C, unless otherwise noted. Typical values

are at TA = +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

MOSFET DRIVERS

DH Gate-Driver On-Resistance

VBST - VLX = 5V

1

4

Ω

DL Gate-Driver On-Resistance in

High State

1

4

Ω

DL Gate-Driver On-Resistance in

Low State

Dead Time (Additional to

Adaptive Delay)

INPUTS AND OUTPUTS

Logic Input Threshold

(SHDN_, STBY, SKIP (Note 4))

Logic Input Current

(SHDN_, STBY, SKIP (Note 4))

Dual-Mode™ Input Logic

Levels (FB)

Input Bias Current (FB)

Four-Level Input Logic Levels

(TON, OVP/UVP (Note 4))

Logic Input Current

(TON, OVP/UVP (Note 4))

OUT Input Resistance

OUT Discharge-Mode

On-Resistance

DH falling to DL rising

DL falling to DH rising

Rising edge

Hysteresis

Low (2.5V output)

High (1.8V output)

High

Floating

REF

Low

FB = GND

FB = AVDD

FB adjustable mode

(Note 4)

0.5

3

Ω

30

ns

30

1.20

1.7

2.20

V

225

mV

-1

+1

µA

2.1

-0.1

AVDD -

0.4

3.15

1.65

0.05

V

+0.1

µA

3.85

V

2.35

0.5

-3

+3

µA

90

175

350

70

135

270

kΩ

400 800 1600

10

25

Ω

DL Turn-On Level During

Discharge Mode

(Measured at OUT)

(Note 4)

Dual Mode is a trademark of Maxim Integrated Products, Inc.

0.3

V

4 _______________________________________________________________________________________

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