Rainbow-electronics MAX1813 Manual de usuario descargar pdf (Pagina 6)

MAX1813

Dynamically-Adjustable, Synchronous Step-Down

Controller with Integrated Voltage Positioning

6 _______________________________________________________________________________________

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,

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

PARAMETER SYMBOL CONDITIONS MIN MAX UNITS

Shutdown Supply Current (V+) SKP/SDN = GND, V

= V

= 0 or 5V 5 µA

Reference Voltage V

REF

= 4.5V to 5.5V, -40µA ≤ I

REF

≤ +40µA 1.98 2.02 V

REF Fault Lockout Voltage Falling edge, 1% hysteresis 1.5 1.7 V

FAULT PROTECTION

CODE = GND 2.20 2.30

Output Overvoltage Fault Preset

Threshold

OVP

Measured at FB

CODE = V

1.95 2.05

Output Undervoltage Fault

Threshhold

With respect to unloaded output voltage 60 80 %

Current-Limit Threshold

(Positive, Default)

ITH

GND

- V

VPCS

, ILIM = V

40 60 mV

ILIM

= 0.5V 40 60

Current-Limit Threshold

(Positive, Adjustable)

ITH

GND

- V

VPCS

ILIM

= 2V (REF) 143 265

Negative Current-Limit Threshold

GND

- V

VPCS

, with respect to V

ITH

ILIM = V

-75 -35 mV

Undervoltage Lockout

Threshold

Rising edge, hysteresis = 20mV, switching

disabled below this level

4.05 4.45 V

PGOOD Lower Trip Threshold

Measured at FB with respect to unloaded

output voltage, falling edge

-15 -10.5 %

PGOOD Upper Trip Threshold

Measured at FB with respect to unloaded

output voltage, rising edge

812%

PGOOD Output Low Voltage I

SINK

= 1mA 0.4 V

PGOOD Leakage Current High state, forced to 5.5V 1 µA

GATE DRIVERS

DH Gate Driver On-Resistance R

(

D H

)

BST

- V

forced to 5V 3.5 Ω

High state (pull up) 3.5

DL Gate Driver On-Resistance R

(

)

Low state (pull down) 1.0

Ω

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

D0−D4, CODE = V

-1 +1

Logic Input Current

SUS, ZMODE = GND or V

-1 +1

µA

1 2 3 4 5 6 7 8 9 10 11 ... 37 38

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Rainbow-electronics MAX1813 Manual de usuario Pagina 6

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