MAX8795A datasheet(11/31 Pages) MAXIM

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TFT-LCD DC-DC Converter with

Operational Amplifiers

______________________________________________________________________________________

µs/div

STEP-UP REGULATOR PULSED

LOAD-TRANSIENT RESPONSE

13.9V

50mA

MAX8795A toc05

A: LOAD CURRENT, 1A/div

B: VMAIN, 200mV/div, AC-COUPLED

C: INDUCTOR CURRENT, 1A/div

TIMER-DELAYED OVERLOAD PROTECTION

MAX8795A toc06

40ms/div

A: VMAIN, 2V/div

B: INDUCTOR CURRENT, 1A/div

REF VOLTAGE LOAD REGULATION

LOAD CURRENT (

µA)

1.2475

1.2480

1.2485

1.2490

1.2495

1.2500

1.2470

050

GATE-ON REGULATOR LINE REGULATION

INPUT VOLTAGE (V)

-0.6

-0.4

-0.2

-0.8

IPOS = 20mA

GATE-ON REGULATOR LOAD REGULATION

LOAD CURRENT (mA)

-0.3

-0.1

-0.5

020

IBOOST = 200mA

STEP-UP REGULATOR SOFT-START

(HEAVY LOAD)

MAX8795A toc04

2ms/div

A: VIN, 5V/div

B: VMAIN, 5V/div

C: INDUCTOR CURRENT, 1A/div

STEP-UP EFFICIENCY

vs. LOAD CURRENT

LOAD CURRENT (mA)

100

1000

VIN = 5V

VMAIN = 13.9V

SWITCHING FREQUENCY

vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

5.0

4.5

4.0

3.5

3.0

1.1

1.2

1.3

1.4

1.0

2.5

5.5

STEP-UP SUPPLY CURRENT

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

5.5

5.0

4.5

4.0

3.5

3.0

2.5

6.0

NO LOAD, SUP DISCONNECTED,

R1 = 221k

Ω, R2 = 21.5kΩ

CURRENT INTO INDUCTOR

CURRENT INTO IN PIN

Typical Operating Characteristics

(Circuit of Figure 1, VIN = 5V, VMAIN = 14V, VGON = 25V, VGOFF = -10V, TA = +25°C, unless otherwise noted.)

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