MAX1997 datasheet(8/31 Pages) MAXIM

8 / 31 page

Quintuple/Triple-Output TFT LCD Power Supplies

with Fault Protection and VCOM Buffer

_______________________________________________________________________________________

Typical Operating Characteristics (continued)

(Circuit of Figure 1, VIN = 3.3V, VMAIN = 9V, VG_ON = 20V, VG_OFF = -7V, VLOGIC = 2.5V, VGAMMA = 8.6V, TA = +25

°C,

unless otherwise noted.)

STEP-UP REGULATOR LOAD TRANSIENT RESPONSE

(WITH LAG COMPENSATION, FIGURE 9)

MAX1997 toc08

µs/div

0.5A

200mA

8.9V

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

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

C: INDUCTOR CURRENT, 500mA/div

R7 = 76.8k

Ω, R8 = 12.1kΩ, R10 = 1.5kΩ, C10 = 470pF

STEP-UP REGULATOR LOAD TRANSIENT RESPONSE

µs PULSES)

(WITHOUT LAG COMPENSATION, FIGURE 1)

MAX1997 toc09

µs/div

8.9V

50mA

A: IMAIN = 50mA TO 1A, 1A/div

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

C: INDUCTOR CURRENT, 1A/div

STEP-UP REGULATOR LOAD TRANSIENT RESPONSE

µs PULSES)

(WITH LAG COMPENSATION, FIGURE 9)

MAX1997 toc10

µs/div

8.9V

50mA

A: IMAIN = 50mA TO 1A, 1A/div

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

C: INDUCTOR CURRENT, 1A/div

R7 = 76.8k

Ω, R8 = 12.1kΩ, R10 = 1.5kΩ, C10 = 470pF

STEP-UP REGULATOR SOFT-START

MAX1997 toc11

1ms/div

10V

A: VSHDN, 5V/div

B: VGATE, 5V/div

C: VDRAIN, 5V/div

D: VMAIN, 5V/div

POWER-UP SEQUENCE

MAX1997 toc12

4ms/div

10V

-10V

10V

20V

A: VMAIN, 10V/div

B: VSOURCE, 10V/div

C: VGATE_ON, 10V/div

D: VGATE_OFF, 10V/div

VONN < VONP < VON2

10V

POWER-UP SEQUENCE

MAX1997 toc13

4ms/div

10V

-10V

10V

20V

A: VMAIN, 10V/div

B: VSOURCE, 10V/div

C: VGATE_ON, 10V/div

D: VGATE_OFF, 10V/div

VONN > VONP > VON2

10V

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