Rainbow-electronics MAX1715 Manual do Utilizador descarregar pdf (Página 5)

MAX1715

Ultra-High Efficiency, Dual Step-Down

Controller for Notebook Computers

_______________________________________________________________________________________ 5

0.01 1010.1

100

MAX1715-01

LOAD CURRENT (A)

EFFICIENCY (%)

EFFICIENCY vs. LOAD CURRENT

(1.8V, 4A COMPONENTS, SKIP = GND)

V+ = +7V

V+ = +12V

V+ = +20V

0.01 1010.1

100

MAX1715-02

LOAD CURRENT (A)

EFFICIENCY (%)

EFFICIENCY vs. LOAD CURRENT

(1.8V, 4A COMPONENTS, SKIP = V

)

V+ = +7V

V+ = +20V

V+ = +12V

0.01 1010.1

100

MAX1715-03

LOAD CURRENT (A)

EFFICIENCY (%)

EFFICIENCY vs. LOAD CURRENT

(2.5V, 4A COMPONENTS, SKIP = GND)

V+ = +7V

V+ = +20V

V+ = +12V

Note 1: Specifications to -40°C are guaranteed by design, and not production tested.

Note 2: When the inductor is in continuous conduction, the output voltage will have a DC regulation higher than the trip level by

50% of the ripple. In discontinuous conduction (SKIP = AGND, light load) the output voltage will have DC regulation

higher than the trip level by approximately 1.5% due to slope compensation.

Note 3: On-time and off-time specifications are measured from the 50% point at the DH pin with LX = PGND, V

BST

= 5V. Actual

in-circuit times may differ due to MOSFET switching speeds.

__________________________________________Typical Operating Characteristics

(Circuit of Figure 1, components from Table 1, V

= +15V, SKIP = AGND, TON = unconnected, T

= +25°C, unless otherwise noted.)

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, 4A components from Table 1, V

CC =

= +5V, SKIP = AGND, V+ = 15V, T

= -40°C to +85°C, unless otherwise

noted.) (Note 1)

Quiescent Battery Current (V+) 25 70 µA

Reference Voltage 1.97 2 2.03 VNo external REF load

Quiescent Supply Current

+ V

)

1100 1600 µAFB1 and FB2 forced above the regulation point

PARAMETER MIN TYP MAX UNITSCONDITIONS

Reference Load Regulation 0.01 VI

REF

= 0 to 50µA

Overvoltage Trip Threshold 10 12.5 15 %With respect to error comparator threshold

Output Undervoltage Threshold 60 70 80 %With respect to error comparator threshold

Current-Limit Threshold (positive

direction, fixed)

75 100 125 mVPGND - LX_, I

LIM

= V

Current-Limit Threshold (positive

direction, adjusted)

32 50 62

PGND - LX_, I

LIM

resistor = 100kΩ

PGND - LX_, I

LIM

resistor = 400kΩ 160 200 240

Thermal Shutdown Threshold 150 °CHysteresis = 10°C

Rising edge, hysteresis = 20mV, PWM disabled below

this level

4.1 4.4 V

Undervoltage Lockout

Threshold

Logic Input High Voltage 2.4 V

ON_, SKIP

0.8 VLogic Input Low Voltage

SKIP, to deactivate OVP circuitry

-5 -1 mALogic Input Current

1 2 3 4 5 6 7 8 9 10 ... 24 25

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