Rainbow-electronics MAX1718 Manual do Utilizador descarregar pdf (Página 6)

MAX1718

Notebook CPU Step-Down Controller for Intel

Mobile Voltage Positioning (IMVP

II)

6 _______________________________________________________________________________________

Typical Operating Characteristics

(Circuit of Figure 1, V+ = 12V, V

= V

= SKP/SDN = 5V, V

OUT

= 1.25V, T

= +25°C, unless otherwise noted.)

50-

0.01 0.1 1 10 100

EFFICIENCY vs. LOAD CURRENT

300kHz VOLTAGE POSITIONED

MAX1718 toc01

LOAD CURRENT (A)

EFFICIENCY (%)

SKIP MODE

V+ = 7V

SKIP MODE

V+ = 20V

PWM MODE

V+ = 12V

PWM MODE

V+ = 20V

SKIP MODE

V+ = 12V

PWM MODE

V+ = 7V

400

300

200

100

01051520

FREQUENCY vs. LOAD CURRENT

MAX1718 toc02

LOAD CURRENT (A)

FREQUENCY (kHz)

PWM MODE

SKIP MODE

250

280

270

260

290

300

310

320

330

340

350

7.0 13.810.4 17.2 20.6 24.0

FREQUENCY vs. INPUT VOLTAGE

MAX1718 toc03

INPUT VOLTAGE (V)

FREQUENCY (kHz)

OUT

= 18A

OUT

= 3A

323.0

324.0

323.5

325.0

324.5

325.5

326.0

-40 10-15 35 60 85

FREQUENCY vs. TEMPERATURE

MAX1718 toc04

TEMPERATURE (°C)

FREQUENCY (kHz)

OUT

= 19A

-40 10-15 35 60 85

OUTPUT CURRENT AT CURRENT LIMIT

vs. TEMPERATURE

MAX1718 toc05

TEMPERATURE (°C)

CURRENT (A)

300

200

100

400

500

600

700

800

900

1000

5 10152025

NO-LOAD SUPPLY CURRENT

vs. INPUT VOLTAGE

MAX1718\ toc06

INPUT VOLTAGE (V)

SUPPLY CURRENT (µA)

+ I

I+

Note 1: On-Time specifications are measured from 50% to 50% at the DH pin, with LX forced to 0V, BST forced to 5V, and a 500pF

capacitor from DH to LX to simulate external MOSFET gate capacitance. Actual in-circuit times may be different due to

MOSFET switching speeds.

Note 2: Specifications to T

= -40°C are guaranteed by design and not production tested.

ELECTRICAL CHARACTERISTICS (continued)

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

= V

= SKP/SDN = 5V, V

OUT

= 1.25V, T

= -40°C to +85°C, unless otherwise noted.) (Note 2)

D0–D4, 0 to 0.4V or 2.6V to 5.5V applied through resistor,

ZMODE = V

kΩ

DAC B-Mode Programming

Resistor, High

D0–D4, ZMODE, SUS, OVP

0.8

Logic Input Low Voltage

CONDITIONS UNITSMIN TYP MAXPARAMETER

D0–D4, 0 to 0.4V or 2.6V to 5.5V applied through resistor,

ZMODE = V

kΩ

1.05

DAC B-Mode Programming

Resistor, Low

D0–D4, ZMODE, SUS, OVP

2.4

Logic Input High Voltage

LOGIC AND I/O

1 2 3 4 5 6 7 8 9 10 11 ... 34 35

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