MAX1714(1999) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX1714
(Rev.:1999)

High-Speed Step-Down Controller for Notebook Computers

Maxim Integrated 

High-Speed Step-Down Controller

for Notebook Computers

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, 4A components from Table 1, V+ = +15V, VCC = VDD = +5V, SKIP = AGND, TA = 0°C to +85°C, unless otherwise

noted.) (Note 1)

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

Overvoltage Trip Threshold

With respect to error comparator threshold (MAX1714A only) 10.5 12.5 14.5

%

Overvoltage Fault Propagation

Delay

FB forced 2% above trip threshold (MAX1714A only)

1.5

µs

Output Undervoltage Protection

Threshold

With respect to error comparator threshold

65

70

75

%

Output Undervoltage Protection

Blanking Time

From SHDN signal going high

10

30

ms

Current-Limit Threshold

(Positive Direction, Fixed)

PGND - LX, ILIM = VCC

90

100

110

mV

Current-Limit Threshold

(Positive Direction, Adjustable)

Current-Limit Threshold

(Negative Direction)

PGND - LX

VILIM = 0.5V

VILIM = 2.0V

PGND - LX, SKIP = VCC, TA = +25°C,

with respect to positive current-limit threshold

40

50

60

mV

170

200

230

-90 -120 -140

%

Current-Limit Threshold

(Zero Crossing)

PGND - LX, SKIP = AGND

3

mV

PGOOD Propagation Delay

PGOOD Output Low Voltage

PGOOD Leakage Current

Thermal Shutdown Threshold

FB forced 2% below PGOOD trip threshold, falling edge

ISINK = 1mA

High state, forced to 5.5V

Hysteresis = 10°C

1.5

µs

0.4

V

1

µA

150

°C

VCC Undervoltage Lockout

Threshold

Rising edge, hysteresis = 20mV,

PWM disabled below this level

4.1

4.4

V

DH Gate-Driver On-Resistance BST - LX forced to 5V

1.5

5

Ω

DL Gate-Driver On-Resistance

(Pull-Up)

DL, high state

1.5

5

Ω

DL Gate-Driver On-Resistance

(Pull-Down)

DL, low state

0.5

1.7

Ω

DH Gate-Driver Source/Sink

Current

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

1

A

DL Gate-Driver Source Current DL forced to 2.5V

1

A

DL Gate-Driver Sink Current

Dead Time

DL forced to 2.5V

DL rising

DH rising

3

A

35

ns

26

SKIP Input Current Logic

Threshold

To disable overvoltage and undervoltage fault detection,

TA = +25°C

-1.5

-0.1

mA

PGOOD Trip Threshold

Measured at FB with respect to error comparator

threshold, falling edge

-8

-6

-4

%

Logic Input High Voltage

Logic Input Low Voltage

Logic Input Current

ILIM Input Current

SHDN, SKIP

SHDN, SKIP

SHDN, SKIP

SHDN, SKIP

2.4

V

0.8

V

-1

1

µA

±10

nA

_______________________________________________________________________________________ 3

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