Rainbow-electronics MAX15051 Manual de usuario descargar pdf (Pagina 3)

MAX15050/MAX15051

High-Efficiency, 4A, 1MHz, Step-Down Regulators

with Integrated Switches in 2mm x 2mm Package

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(V

IN

= V

EN

= 5V, C

VDD

= 2.2µF, T

A

= -40°C to +85°C, typical values are at T

A

= +25°C, unless otherwise noted.) (Note 4)

PARAMETER CONDITIONS MIN TYP MAX UNITS

COMP

COMP Clamp Voltage High V

DD

= 2.9V to 5V, V

FB

= 0.5V, V

REFIN/SS

= 0.6V 2 V

COMP Clamp Voltage Low V

DD

= 2.9V to 5V, V

FB

= 0.7V, V

REFIN/SS

= 0.6V 0.68 V

COMP Slew Rate V

FB

= 0.7V to 0.5V, V

REFIN/SS

= 0.6V 1.4 V/µs

COMP Shutdown Resistance

From COMP to GND, V

IN

= 3.3V, V

COMP

= 100mV,

V

EN

= V

REFIN/SS

= 0V

6 

ERROR AMPLIFIER

FB Regulation Accuracy Using

External Resistors

0.594 0.6 0.606 V

Open-Loop Voltage Gain 115 dB

Error-Amplifier Unity-Gain

Bandwidth

26 MHz

Error-Amplifier Common-Mode

Input Range

V

DD

= 2.9V to 3.5V 0 V

DD

- 2 V

V

FB

= 0.7V, sink 1

Error-Amplifier Maximum Output

Current

V

COMP

= 1V, no switching,

V

REFIN/SS

= 0.6V

V

FB

= 0.5V, source -1

mA

FB Input Bias Current V

FB

= 0.7V 70 nA

REFIN/SS

REFIN/SS Common-Mode Range V

DD

= 2.9V to 3.5V 0 V

DD

- 2 V

REFIN/SS Charging Current V

REFIN/SS

= 0.45V 6 8 10 µA

REFIN/SS Offset Voltage V

REFIN/SS

= 0.9V, FB shorted to COMP -4.5 +4.5 mV

REFIN/SS Pulldown Resistance V

IN

= V

DD

= 3.3V, V

REFIN/SS

= 0.1V 300 

LX (ALL BUMPS COMBINED)

LX On-Resistance, High Side I

LX

= -500mA V

IN

= V

BST

- V

LX

= 3.3V 24 54 m

LX On-Resistance, Low Side I

LX

= 500mA V

IN

= 3.3V 18 50 m

High-side sourcing 5.4 8

Low-side sourcing 7

Low-side sinking 7

Zero-crossing current threshold 0.2

Skip high-side sourcing 0.58

A

LX Current-Limit Thresholds V

IN

= 3.3V

Sink current-limit DAC steps 4 Steps

V

LX

= 0V -10

LX Leakage Current V

EN

= 0V

V

LX

= 5V 10

µA

LX Switching Frequency V

IN

= 3.3V 0.9 1 1.1 MHz

LX Maximum Duty Cycle V

IN

= 3.3V 90 96 %

LX Minimum On-Time V

IN

= 3.3V 80 ns

RMS LX Output Current 4 A

ENABLE

EN Input Logic-Low Threshold

(Falling)

0.7 V

1 2 3 4 5 6 7 8 ... 14 15

MAX15050/MAX15051 1

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