Rainbow-electronics MAX15026 Manual de usuario descargar pdf (Pagina 3)

MAX15026

Low-Cost, Small, 4.5V to 28V Wide Operating

Range, DC-DC Synchronous Buck Controller

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PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ENABLE (EN)

EN Input High V

EN_H

rising 1.14 1.20 1.26 V

EN Input Low V

EN_L

falling 0.997 1.05 1.103 V

EN Input Leakage Current I

LEAK_EN

= 5.5V -1 +1 µA

OSCILLATOR

Switching Frequency f

= 27kΩ 540 600 660 kHz

1MHz Switching Frequency R

= 15.7kΩ 0.9 1 1.1 MHz

2MHz Switching Frequency R

= 7.2kΩ 1.8 2.0 2.4 MHz

Switching Frequency Adjustment

Range (Note 3)

200 2000 kHz

RT Voltage V

1.19 1.205 1.22 V

PWM Ramp Peak-to-Peak

DRV_UVLO

DRV

rising 4.0 4.2 4.4 V

DRV Undervoltage Lockout

Hysteresis

400 mV

Low, sinking 100mA, V

BST

= 5V 1 3

DH On-Resistance

High, sourcing 100mA, V

BST

= 5V 1.5 4.5

Ω

Low, sinking 100mA, V

DRV

= 5.2V 1 3

DL On-Resistance

High, sourcing 100mA, V

DRV

= 5.2V 1.5 4.5

Ω

Sinking 1.8

DH Peak Current C

LOAD

= 10nF

Sourcing 2

Sinking 3

DL Peak Current C

LOAD

= 10nF

Sourcing 2.4

DH/DL Break-Before-Make Time

Time from high side at 1V to low side at

10 ns

SOFT-START

Soft-Start Duration 2048

Switching

Cycles

Reference Voltage Steps 64 Steps

CURRENT LIMIT/HICCUP

Current-Limit Threshold

Adjustment Range

Cycle-by-cycle valley current-

limit threshold adjustment range

valley limit = V

LIM

/10

30 300 mV

ELECTRICAL CHARACTERISTICS (continued)

= 12V, R

= 27kΩ, R

LIM

= 30kΩ, C

VCC

= 4.7µF, C

= 1µF, T

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

= +25°C.) (Note 2)

1 2 3 4 5 6 7 8 ... 21 22

MAX15026 1

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Rainbow-electronics MAX15026 Manual de usuario Pagina 3

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