Rainbow-electronics MAX1885 Bedienungsanleitung PDF herunterladen (Seite 18)

MAX1778/MAX1880–MAX1885

Quad-Output TFT LCD DC-DC

Converters with Buffer

18 ______________________________________________________________________________________

Pin Description (continued)

MAX1778

MAX1881

MAX1880

MAX1882

MAX1883

MAX1884

MAX1885

NAME FUNCTION

14 − 12 − LDOOUT

Linear Regulator Output. Sources up to 40mA. Bypass to GND with

a ceramic capacitor determined by:

15 − 13 − FBL

Voltage Setting Input. Connect a resistive divider from the linear

regulator output (V

LDOOUT

) to FBL to analog ground (GND).

16 16 14 14 FLTSET

Fault Trip-Level Set Input. Connect to a resistive divider between

REF and GND to set the main step-up converter’s and positive

charge pump’s fault thresholds between 0.67 x V

REF

and 0.85 x

REF

. Connect to GND for the preset fault threshold (0.9 x V

REF

17 17 −−SUPN

Negative Charge-Pump Driver Supply Voltage. Bypass to power

ground (PGND) with a 0.1µF capacitor.

18 18 −−DRVN

Negative Charge-Pump Driver Output. Output high level is V

SUPN

and low level is PGND.

19 19 −−SUPP

Positive Charge-Pump Driver Supply Voltage. Bypass to power

ground (PGND) with a 0.1µF capacitor.

20 20 −−DRVP

Positive Charge-Pump Driver Output. Output high level is V

SUPP

and low level is PGND

21 21 17 17 PGND

Power Ground. Connect to analog ground (GND) underneath the

IC.

22 22 18 18 LX

Main Step-Up Regulator Power MOSFET N-Channel Drain. Place

output diode and output capacitor as close to PGND as possible.

23 23 19 19 TGND Must be connected to ground.

24 24 20 20 RDY

Active-Low, Open-Drain Output. Indicates all outputs are ready.

On-resistance is 125Ω (typ).

− 13, 14, 15 15, 16

11, 12, 13,

15, 16

N.C. No Connection. Not internally connected.

CmsX

LDOOUT

LDOOUT MAX

LDOOUT

()

≥













1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 37 38

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