Rainbow-electronics MAX1885 Uživatelský manuál stáhnout pdf (Strana 12)

MAX1778/MAX1880–MAX1885

Quad-Output TFT LCD DC-DC

Converters with Buffer

12 ______________________________________________________________________________________

4.75

4.80

4.85

4.90

4.95

5.00

5.05

MAX1778 toc22

SUPL

(V)

LDOOUT

(V)

LDO OUTPUT VOLTAGE

vs. LDO INPUT VOLTAGE

(INTERNAL LINEAR REGULATOR)

4861012

LDOOUT

= 0

LDOOUT

= 40mA

5.04

5.02

4.90

0.01 0.1 10 100

4.92

4.96

4.94

5.00

4.98

MAX1778 toc23

LDOOUT

(mA)

LDOOUT

(V)

LDO OUTPUT VOLTAGE

vs. LDO OUTPUT CURRENT

(INTERNAL LINEAR REGULATOR)

4.90

4.96

4.94

4.92

4.98

5.00

5.02

5.04

5.06

5.08

5.10

-40 10-15 35 60 85

LDO OUTPUT VOLTAGE vs. TEMPERATURE

(INTERNAL LINEAR REGULATOR)

MAX1778 toc24

TEMPERATURE (

LDO

(V)

LDOOUT

= 0

LDOOUT

= 40mA

120

160

200

MAX1778 toc25

LDOOUT

(mA)

SUPL

- V

LDOOUT

(mV)

02010 30 40

DROPOUT VOLTAGE

vs. LDO LOAD CURRENT

(INTERNAL LINEAR REGULATOR)

LDOOUT

= 5V

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

0 10203040

MAX1778 toc26

LDOOUT

(mA)

SUPL

- I

LDOOUT

(mA)

LDO SUPPLY CURRENT

vs. LDO OUTPUT CURRENT

(INTERNAL LINEAR REGULATOR)

LDOOUT

= 5V

Typical Operating Characteristics (continued)

(Circuit of Figure 1, V

= +3.3V, SHDN = IN, V

MAIN

= V

SUPP

= V

SUPN

= V

SUPB

= V

SUPL

= 8V, BUF- = BUFOUT,

BUF+ = FLTSET = TGND = PGND = GND, T

= +25°C.)

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 37 38

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