Rainbow-electronics MAX1885 Manual de usuario descargar pdf (Pagina 7)

MAX1778/MAX1880–MAX1885

Quad-Output TFT LCD DC-DC

Converters with Buffer

_______________________________________________________________________________________ 7

ELECTRICAL CHARACTERISTICS (continued)

= +3.0V, SHDN = IN, V

SUPP

= V

SUPN

= V

SUPB

= V

SUPL

= 10V, LDOOUT = FBL, BUF- = BUFOUT, BUF+ = FLTSET = TGND =

PGND = GND, C

REF

= 0.22µF, C

BUF

= 1µF, T

= -40°C to +85°C, unless otherwise noted.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN MAX UNITS

POSITIVE CHARGE PUMP (MAX1778/MAX1880/MAX1881/MAX1882 ONLY)

SUPP Input Supply Range V

SUPP

2.7 13 V

FBP Regulation Voltage V

FBP

1.2 1.3 V

FBP Input Bias Current I

FBP

= 1.5V -50 +50 nA

DRVP PCH On-Resistance R

PCH

(

)

10 Ω

FBP

= 1.2V 4 Ω

DRVP NCH On-Resistance R

NCH

(

)

FBP

= 1.3V 20 kΩ

FBP Power-Ready Trip Level Rising edge 1.09 1.16 V

NEGATIVE CHARGE PUMP (MAX1778/MAX1880/MAX1881/MAX1882 ONLY)

SUPN Input Supply Range V

SUPN

2.7 13 V

FBN Regulation Voltage V

FBN

-50 +50 mV

FBN Input Bias Current I

FBN

= 0 -50 +50 nA

DRVN PCH On-Resistance R

PCH

(

)

10 Ω

FBN

= +50mV 4 Ω

DRVN NCH On-Resistance R

NCH

(

)

FBN

= -50mV 20 kΩ

FBN Power-Ready Trip Level Falling edge 80 165 mV

LOW DROPOUT LINEAR REGULATOR (MAX1778/MAX1881/MAX1883/MAX1884 ONLY)

SUPL Input Supply Range V

SUPL

4.5 15 V

SUPL Undervoltage Lockout Rising edge, 50mV hysteresis (typ) 3.8 4.3 V

SUPL Quiescent Current I

SUPL

LDO

= 100µA 240 µA

Dropout Voltage (Note 1) V

DROP

LDO regulating to 9V, I

LDO

= 40mA 330 mV

FBL Regulation Voltage V

FBL

SUPL

= 10V, LDO regulating to 9V,

LDO

= 15mA

1.222 1.265 V

LDO Load Regulation

SUPL

= 10V, LDO regulating to 9V,

LDO

= 100µA to 40mA

1.2 %

LDO Line Regulation

SUPL

= 4.5V to 15V, FBL = LDOOUT,

LDO

= 15mA

0.02 %/V

FBL Input Bias Current I

FBL

= 1.25V -1.2 +1.2 µA

LDO Current Limit I

LDOLIM

SUPL

= 10V, V

LDOOUT

= 9V, V

FBL

= 1.2V 40 260 mA

VCOM BUFFER

SUPB Input Supply Range V

SUPB

4.5 13 V

SUPB Quiescent Current I

SUPB

= 13V 850 µA

BUFOUT Leakage Current -10 +10 µA

Input Common-Mode Voltage

| < 10mV 1.2 8.8 V

1 2 3 4 5 6 7 8 9 10 11 12 ... 37 38

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Rainbow-electronics MAX1885 Manual de usuario Pagina 7

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