MAX188 datasheet(6/32 Pages) MAXIM

6 / 32 page

Triple-Output TFT LCD Power Supply

with Fault Protection

_______________________________________________________________________________________

Typical Operating Characteristics (continued)

(Circuit of Figure 1, VIN = +3.3V, VMAIN = +9V, VPL = +20V, VNL = -7V, SHDN = FREQ = IN, PGND = GND, TA = +25°C, unless

otherwise noted.)

100

1000

STEP-UP REGULATOR OUTPUT VOLTAGE

vs. LOAD CURRENT (VMAIN = 13V)

LOAD CURRENT (mA)

13.1

12.5

12.6

12.7

12.8

12.9

13.0

VIN = 2.7V

VIN = 3.3V

VIN = 5.5V

500

700

600

900

800

1000

1100

STEP-UP REGULATOR SWITCHING

FREQUENCY vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

2.5

3.5

4.0

3.0

4.5

5.0

5.5

VIN = 3.3V

VMAIN = 9V

IMAIN = 200mA

µs/div

STEP-UP REGULATOR LOAD-TRANSIENT

RESPONSE (0 TO 200mA)

MAX1889 toc06

500mA

8.9V

200mA

A: INDUCTOR CURRENT, 500mA/div

B: VMAIN = 9V, 100mV/div, AC-COUPLED

C: IMAIN = 0 TO 200mA, 200mA/div

µs/div

STEP-UP REGULATOR LOAD-TRANSIENT

RESPONSE (0 TO 1A, 2

µs PULSE)

MAX1889 toc07

8.9V

A: INDUCTOR CURRENT, 1A/div

B: VMAIN = 9V, 100mV/div, AC-COUPLED

C: IMAIN = 0 TO 1A, 1A/div

8.8V

1ms/div

STEP-UP REGULATOR SOFT-START

(10mA LOAD) FROM

SLOW-RISING INPUT SUPPLY

MAX1889 toc08

A: VIN, 5V/div

B: VGATE, 5V/div

C: VC2, 5V/div

D: VMAIN = 9V, 5V/div

10V

1ms/div

STEP-UP REGULATOR SOFT-START

(200mA LOAD) FROM

SLOW-RISING INPUT SUPPLY

MAX1889 toc09

A: VIN, 5V/div

B: VGATE, 5V/div

C: VC2, 5V/div

D: VMAIN = 9V, 5V/div

10V

MAX188 Datasheet(PDF) 6 Page - Maxim Integrated Products

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