Rainbow-electronics MAX8758 Manual do Utilizador descarregar pdf (Página 6)

MAX8758

Step-Up Regulator with Switch Control and

Operational Amplifier for TFT LCD

6 _______________________________________________________________________________________

Typical Operating Characteristics

(Circuit of Figure 1, V

= 3.3V, V

MAIN

= 8.5V, FREQ = SHDN = IN, T

= +25°C, unless otherwise noted.)

STEP-UP REGULATOR EFFICIENCY

vs. LOAD CURRENT (V

MAIN

= 8.5V)

MAX8758 toc01

LOAD CURRENT (mA)

EFFICIENCY (%)

10010

11000

OSC

= 1.2MHz

L = 4.7

= 5.5V

= 1.8V

= 3.3V

STEP-UP REGULATOR EFFICIENCY

vs. LOAD CURRENT (V

MAIN

= 8.5V)

MAX8758 toc02

LOAD CURRENT (mA)

EFFICIENCY (%)

10010

1 1000

OSC

= 640kHz

L = 10

= 5.5V

= 1.8V

= 3.3V

OUTPUT VOLTAGE (V)

8.0

8.1

8.2

8.3

8.4

8.5

8.6

7.9

STEP-UP REGULATOR OUTPUT VOLTAGE

vs. LOAD CURRENT (V

MAIN

= 8.5V)

MAX8758 toc03

LOAD CURRENT (mA)

100101 1000

OSC

= 1.2Hz

= 3.3V

IN QUIESCENT CURRENT

vs. SUPPLY VOLTAGE

MAX8758 toc04

(V)

SUPPLY CURRENT (µA)

5.04.54.03.53.02.52.0

1.5 5.5

CURRENT INTO IN PIN

NOT SWITCHING

- 1.5V

TEMPERATURE (

SUPPLY CURRENT (µA)

603510-15

-40 85

IN QUIESCENT CURRENT

vs. TEMPERATURE

MAX8758 toc05

CURRENT INTO IN PIN

= 3.3V

NOT SWITCHING

- 1.5V

SWITCHING FREQUENCY

vs. INPUT VOLTAGE

MAX8758 toc06

(V)

SWITCHING FREQUENCY (kHz)

4.53.52.5

600

800

1000

1200

400

1.5 5.5

FREQ = V

FREQ = AGND

MAIN

= 200mA

STEP-UP REGULATOR HEAVY-LOAD

SOFT-START

MAX8758 toc07

1ms

2V/div

MAIN

5V/div

500mAV/div

STEP-UP REGULATOR LOAD TRANSIENT

RESPONSE

MAX8758 toc08

20µs/div

MAIN

AC-COUPLED

200mV/div

L = 4.7

COMP

= 100k

Ω

COMP1

= 220pF

COMP2

= 47pF

50mA

MAIN

500mA/div

1AV/div

1 2 3 4 5 6 7 8 9 10 11 ... 19 20

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