Rainbow-electronics MAX1843 Manual do Utilizador descarregar pdf (Página 3)

MAX1843

2.7A, 1MHz, Low-Voltage, Step-Down Regulator with

Internal Synchronous Rectification in QFN Package

_______________________________________________________________________________________ 3

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Idle-Mode Current Threshold 0.3 0.6 0.9 A

Switching Frequency f (Note 2) 1 MHz

No-Load Supply Current I

+ I

= 1.2V 350 600 µA

Shutdown Supply Current

+ I

SHDN = GND, includes PMOS leakage <1 15 µA

Thermal Shutdown Threshold T

SHDN

Hysteresis = 15°C 160 °C

Undervoltage Lockout

UVLO

falling, hysteresis = 90mV 2.5 2.6 2.7 V

FB Input Bias Current V

= 1.2V 0 60 250 nA

TOFF

= 110kΩ 0.9 1.00 1.1

TOFF

= 30.1kΩ 0.24 0.30 0.37

Off-Time t

OFF

TOFF

= 499kΩ 3.8 4.5 5.2

µs

Off-Time Startup Period FB = GND 4 t

OFF

µs

On-Time t

(Note 2) 0.4 µs

SS Source Current I

456µA

SS Sink Current I

= 1V 100 µA

SHDN Input Current I

SHDN

= 0 to V

-1 1 µA

SHD N Log i c Inp ut Low V ol tag e

0.8 V

SHD N Log i c Inp ut H i g h V ol tag e

2.0 V

FBSEL Input Current I

FBSEL

= 0 to V

-4 4 µA

FBSEL = GND 0.2

FBSEL = REF 0.9 1.3

FBSEL = unconnected

0.7V

- 0.2

0.7V

+ 0.2

FBSEL Logic Thresholds

FBSEL = V

- 0.2

M axi m um O utp ut RM S C ur r ent 3.1 A

RMS

ELECTRICAL CHARACTERISTICS

= V

= +3.3V, FBSEL = GND, T

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

= +25°C.) (Note 3)

PARAMETER

SYMBOL

CONDITIONS MIN MAX

UNITS

Input Voltage

, V

3.0 5.5 V

FBS E L = V

C C

2.475 2.756

FBS E L = unconnected 1.485 1.545

FBS E L = RE F 1.782 1.854

Preset Output Voltage V

OUT

= +3V to + 5.5V,

LOAD

= 0 to 2.5A,

= V

OU T

FBS E L = GN D 1.078 1.122

Adjustable Output Voltage

Range

= V

= +3V to +5.5V, FBS E L = GN D V

REF

Reference Voltage V

REF

1.078 1.122 V

= +4.5V 200

PMOS Switch On-Resistance R

ON,P

= 0.5A

= +3V 250

mΩ

ELECTRICAL CHARACTERISTICS (continued)

= V

= +3.3V, FBSEL = GND, T

= 0°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

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