Rainbow-electronics MAX1813 Manual de usuario descargar pdf (Pagina 3)

MAX1813

Dynamically-Adjustable, Synchronous Step-Down

Controller with Integrated Voltage Positioning

_______________________________________________________________________________________ 3

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

Quiescent Supply Current (V

Measured at V

, FB forced above the

regulation point

<1 5 µA

Quiescent Supply Current (V+) I+ Measured at V+ 25 40 µA

Shutdown Supply Current (V

) SKP/SDN = GND 2 5 µA

Shutdown Supply Current (V

) SKP/ SDN = GND <1 5 µA

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

= V

= 0 or 5V <1 5 µA

Reference Voltage V

REF

= 4.5V to 5.5V, -40µA ≤ I

REF

≤ +40µA 1.98 2 2.02 V

REF Fault Lockout Voltage Falling edge, 1% hysteresis 1.5 1.6 1.7 V

FAULT PROTECTION

CODE = GND 2.20 2.25 2.30

Output Overvoltage Fault Preset

Threshold

OVP

Measured at FB

CODE = V

1.95 2.00 2.05

Output Overvoltage Fault

Propagation Delay

OVP

FB forced to 2% above trip threshold 1.5 µs

Output Undervoltage Fault

Threshold

With respect to unloaded output voltage 60 70 80 %

Output Undervoltage Fault

Propagation Delay

FB forced to 2% below trip threshold 10 µs

Output Undervoltage Fault-

Blanking Time

From SKP/SDN signal going high, clock

speed set by R

TIME

256 clks

Current-Limit Threshold (Positive,

Default)

ITH

GND

- V

VPCS

, ILIM = V

40 50 60 mV

ILIM

= 0.5V 40 50 60

Current-Limit Threshold

(Positive, Adjustable)

ITH

GND

- V

VPCS

ILIM

= 2V (REF) 143 200 265

Negative Current-Limit Threshold

GND

- V

VPCS

, with respect to V

ITH

, ILIM =

-72 -56 -40 mV

Zero-Crossing Current-Limit

Threshold

GND

- V

VPCS

5mV

Thermal Shutdown Threshold Rising temperature, hysteresis = 15°C 160 °C

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 -12.5 -10.5 %

PGOOD Upper Trip Threshold

Measured at FB with respect to unloaded

output voltage, rising edge

81012%

PGOOD Propagation Delay

Falling edge, FB forced 2% below or

above PGOOD trip threshold

1.5 µs

PGOOD Output Low Voltage I

SINK

= 1mA 0.4 V

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

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

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Rainbow-electronics MAX1813 Manual de usuario Pagina 3

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