Rainbow-electronics MAX1625 Instrukcja Użytkownika Pobierz pdf (Strona 3)

ELECTRICAL CHARACTERISTICS (continued)

= V

= D4 = +5V, PGND = AGND = D0–D3 = 0V, R

FREQ

= 33.3kΩ, T

= 0°C to +85°C, unless otherwise noted.)

MAX1624/MAX1625

_______________________________________________________________________________________

DH = DL = 2.5V

= 4.5V

BST - LX = 4.5V

LG = GND (low)

100mV overdrive

FREQ

= 20kΩ

With respect to V

REF

FB going low

Minimum

MAX1625, CSH = CSL = 1.1V

D0–D4 = 0V, 5V

D0–D4; V

= 4.5V

LG = REF (mid)

MAX1624, CSH = CSL = 1.3V,

D0–D3 = 5V, D4 = 0V

D0–D4; V

= 5.5V

CONDITIONS

-2.75 -2 -1.25

LG = V

(high)

ns0 30

FB = 1.1V

DH, DL Dead Time

A2DH, DL Source/Sink Current

Ω

0.7 2

Maximum

DH On-Resistance 0.7 2

-3 -1

µA100CC2 Source/Sink Current

4 V

2.4 3.0

mmho1

kΩ10CC1 Output Resistance

µA±0.1

3.3 3.7

0.2

%85 90Maximum Duty Cycle

LG Input Voltage

µA

CSH, CSL Input Current

µA4LG Input Current

µA±1D0–D4 Input Current

V2.0Logic Input Voltage High

- 0.2

0.8Logic Input Voltage Low

UNITSMIN TYP MAXPARAMETER

FB Input Current

CC2 Clamp Voltage

CC2 Transconductance

PDRV Trip Level

PDRV, NDRV Response Time FB overdrive = 5% ns75

PDRV, NDRV On-Resistance V

= 4.5V Ω2 5

PDRV, NDRV Source/Sink Current PDRV = NDRV = 2.5V A0.5

PDRV, NDRV Minimum On-Time ns100

Current-Limit Trip Voltage mV85 100 115

Soft-Start Time To full current limit 1 / f

OSC

1536

BST Leakage Current BST = 12V, LX = 7V, REF = GND µA50

High-Speed Step-Down Controllers with

Synchronous Rectification for CPU Power

ΩDL On-Resistance

NDRV Trip Level

With respect to V

REF

FB going high

1.25 2 2.75

1 3

= +25°C

= 0°C to +85°C

= +25°C

= 0°C to +85°C

1 2 3 4 5 6 7 8 ... 23 24

MAX1624/MAX1625 1

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