Rainbow-electronics MAX1638 Bedienungsanleitung PDF herunterladen (Seite 3)

ELECTRICAL CHARACTERISTICS (continued)

= V

= D4 = +5V, PGND = AGND = D0–D3 = 0V, FREQ = REF, T

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

MAX1638

_______________________________________________________________________________________

DH = DL = 2.5V

= 4.5V

BST - LX = 4.5V

GND (low)

100mV overdrive

FREQ = V

With respect to V

REF

FB going low

Minimum

D0–D4 = 0V

D0–D4, V

= 5.5V

REF (mid)

CSH = CSL = 1.3V, D0–D3 = 5V, D4 = 0V

D0–D4, V

= 4.5V

CONDITIONS

-2.75 -2 -1.25

(high)

ns0 30DH, 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, FREQ Input Voltage

µA50CSH, CSL Input Current

µA4LG, FREQ Input Current

µA2 5 10D0–D4 Source Current

V2.0Logic Input Voltage High

- 0.1

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

FB = 3.5V 85 100 115

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 Controller 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

Current-Limit Trip Voltage

FB = 0V (Foldback)

15 38 70

1 2 3 4 5 6 7 8 ... 15 16

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