Rainbow-electronics MAX8548 Manual do Utilizador descarregar pdf (Página 3)

MAX8545/MAX8546/MAX8548

Low-Cost, Wide Input Range, Step-Down

Controllers with Foldback Current Limit

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ELECTRICAL CHARACTERISTICS (continued)

= V

= 5V, T

= -40°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ERROR AMPLIFIER

2.7V < V

< 5.5V, 0°C to +85°C 0.787 0.800 0.815

FB Regulation Voltage

2.7V < V

< 5.5V, -40°C to +85°C 0.782 0.800 0.815

FB to COMP/EN Gain

4000 V / V

FB to COMP/EN

Transconductance

-5µA < I

COMP/EN

< +5µA 70 108 160 µS

FB Input Bias Current V

= 0.88V 1 2 µA

COMP/EN Source Current V

COMP/EN

= 0V 15 46 100 µA

LX to GND, MAX8545, MAX8548,

= 0.8V

-355 -320 -280

Current-Limit Threshold Voltage

(Across Low-Side MOSFET)

LX to GND MAX8546, V

= 0.8V -185 -165 -140

LX to GND, V

= 0V,

MAX8545, MAX8548

-105 -75 -45

Foldback Current-Limit Threshold

Voltage (Across Low-Side

MOSFET) When Output is Short

MAX8546, LX to GND, V

= 0 -53 -38 -22

MOSFET DRIVERS

Rising edge, DH going low to DL going high 96

Break-Before-Make Time

Falling edge, DL going low to DH going high 28

DH On-Resistance in Low State 1.6 4 Ω

DH On-Resistance in High State 2.5 5.5 Ω

DL On-Resistance in Low State 1.1 2.5 Ω

DL On-Resistance in High State 2.5 5.5 Ω

BST Leakage Current V

BST

= 33V, V

= 28V, V

= 0.88V 0 50 µA

LX Leakage Current V

BST

= 33V, V

= 28V, V

= 0.88V 33 100 µA

Note 1: Thermal shutdown disables the buck regulator when the die reaches this temperature. Soft-start is reset but the VL regulator

remains on.

1 2 3 4 5 6 7 8 ... 17 18

MAX8545/MAX8546/MAX8548 1

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