MAX188 datasheet(7/32 Pages) MAXIM

7 / 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.)

2ms/div

POWER-UP SEQUENCE FROM

SLOW-RISING INPUT SUPPLY

20V

MAX1889 toc10

10V

-10V

A: VIN, 5V/div

B: VMAIN = 9V, 5V/div

C: VPL = 20V, 10V/div

D: VNL = -7V, 10V/div

1ms/div

STEP-UP REGULATOR SOFT-START

(10mA LOAD) USING SHDN CONTROL

MAX1889 toc11

A: VSHDN, 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) USING SHDN CONTROL

MAX1889 toc12

A: VSHDN, 5V/div

B: VGATE, 5V/div

C: VC2, 5V/div

D: VMAIN = 9V, 5V/div

10V

2ms/div

POWER-UP SEQUENCE

USING SHDN CONTROL

20V

MAX1889 toc13

10V

-10V

A: VSHDN, 5V/div

B: VMAIN = 9V, 5V/div

C: VPL = 20V, 10V/div

D: VNL = -7V, 10V/div

µs/div

STEP-UP REGULATOR NORMAL OPERATION

(200mA LOAD)

9.05V

MAX1889 toc14

10V

500mA

A: VLX, 5V/div

B: VMAIN = 9V, 50mV/div, AC-COUPLED

C: INDUCTOR CURRENT, 500mA/div

0.1

POSITIVE CHARGE-PUMP

OUTPUT VOLTAGE vs. LOAD CURRENT

LOAD CURRENT (mA)

26.2

25.0

25.2

25.4

25.6

25.8

26.0

VIN = 3.3V

IMAIN = 200mA

MAX188 Datasheet(PDF) 7 Page - Maxim Integrated Products

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