Rainbow-electronics MAX1717 Bedienungsanleitung PDF herunterladen (Seite 3)

MAX1717

Dynamically Adjustable, Synchronous

Step-Down Controller for Notebook CPUs

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ELECTRICAL CHARACTERISTICS (continued)

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

= V

= SKP/SDN = +5V, V

OUT

= 1.6V, T

= 0°C to +85°C, unless otherwise noted.)

Current-Limit Threshold

(Zero Crossing)

mVGND - LX

DH Gate Driver On-Resistance

1.0 3.5

ΩBST - LX forced to 5V

Current-Limit Default

Switchover Threshold

-1 V

- 0.4 V

= 0°C to +85°C

85 115

= +25°C to +85°C

ILIM = REF (2V)

ILIM = 0.5V

PARAMETER MIN TYP MAX UNITS

Output Undervoltage Fault

Blanking Time

256

clks

Output Undervoltage Fault

Propagation Delay

µs

Output Undervoltage Fault

Protection Threshold

65 70 75

Overvoltage Fault Propagation

Delay

µs

Current-Limit Threshold

(Positive, Default)

90 100 110

Current-Limit Threshold

(Positive, Adjustable)

35 50 65

165 200 230

REF Sink Current

Reference Load Regulation

0.01

µA

Overvoltage Trip Threshold

2.20 2.25 2.30

Current-Limit Threshold

(Negative)

-140 -110 -80

Thermal Shutdown Threshold

150

°C

Undervoltage Lockout

Threshold

4.1 4.4

1.0 3.5

DL Gate Driver On-Resistance

0.4 1.0

Ω

DH Gate-Driver Source/Sink

Current

1.3

DL Gate-Driver Sink Current

CONDITIONS

LX - GND, ILIM = V

From SKP/SDN signal going high, clock speed set by R

TIME

Hysteresis = 10°C

FB forced 2% below trip threshold

With respect to unloaded output voltage

FB forced 2% above trip threshold

GND - LX, ILIM = V

Rising edge, hysteresis = 20mV, PWM disabled below

this level

GND - LX

DL, high state (pullup)

DL, low state (pulldown)

DH forced to 2.5V, BST - LX forced to 5V

REF

= 0 to 50µA

DL forced to 2.5V

REF in regulation

Measured at FB

VGATE Lower Trip Threshold

-8 -6.5 -5

Measured at FB with respect to unloaded output voltage,

rising edge, hysteresis = 1%

VGATE Upper Trip Threshold

+10 +12 +14

Measured at FB with respect to unloaded output voltage,

rising edge, hysteresis = 1%

VGATE Propagation Delay

µsFB forced 2% outside VGATE trip threshold

VGATE Output Low Voltage

0.4

SINK

= 1mA

VGATE Transition Delay

clkAfter X = Y, clock speed set by R

TIME

VGATE Leakage Current

µAHigh state, forced to 5.5V

GATE DRIVERS

FAULT PROTECTION

1 2 3 4 5 6 7 8 ... 32 33

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