Rainbow-electronics MAX1813 Uživatelský manuál stáhnout pdf (Strana 4)

MAX1813

Dynamically-Adjustable, Synchronous Step-Down

Controller with Integrated Voltage Positioning

4 _______________________________________________________________________________________

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.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

GATE DRIVERS

DH Gate Driver On-Resistance R

(

D H

)

BST

- V

forced to 5V 1.2 3.5 Ω

High state (pull up) 1.3 3.5

DL Gate Driver On-Resistance R

(

)

Low state (pull down) 0.4 1.0

Ω

DH Gate Driver Source/Sink

Current

DH forced to 2.5V, V

BST

- V

forced to 5V 2.0 A

DL Gate Driver Sink Current I

DL forced to 5V 4.0 A

DL Gate Driver Source Current I

DL forced to 2.5V 1.3 A

DL rising 35

Dead Time

DH rising 26

LOGIC AND I/O

Logic Input High Voltage V

D0−D4, CODE, SUS, ZMODE; V

= 4.5V

to 5.5V

2.4 V

Logic Input Low Voltage V

D0−D4, CODE, SUS, ZMODE; V

= 4.5V

to 5.5V

0.8 V

DAC Z-Mode Programming

Resistor, Low

D0−D4, 0 to 0.4V or 2.6V to 5.5V applied to

the resistor, ZMODE = CODE = GND or

ZMODE = CODE = V

1.05 kΩ

DAC Z-Mode Programming

Resistor, High

D0−D4, 0 to 0.4V or 2.6V to 5.5V applied to

the resistor, ZMODE = CODE = GND or

ZMODE = CODE = V

95 kΩ

Pull up 40

D0−D4, CODE Pull Up/Down

Entering impedance

mode

Pull down 8

kΩ

D0−D4, CODE = V

-1 +1

Logic Input Current

SUS, ZMODE = GND or V

-1 +1

µA

4-Level Logic Input High (V

) TON (200kHz operation), S0, S1

0.4

4-Level Logic Input Upper-

Middle (Float)

TON (300kHz operation), S0, S1 2.8 3.85 V

4-Level Logic Input Lower-

Middle (REF)

TON (600kHz operation), S0, S1 1.65 2.35 V

4-Level Logic Low (GND) TON (1000kHz operation), S0, S1 0.5 V

SKP/SDN High Input Level

(Skip Mode)

2.8 6.0 V

SKP/SDN Float Input Level

(Forced-PWM Mode)

1.4 2.2 V

SKP/SDN Low Input Level

(Shutdown Mode)

0.5 V

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

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