MAX1997ETJ Maxim Integrated Products, MAX1997ETJ Datasheet - Page 7

• Manufacturer Part Number: MAX1997ETJ
• Description: LCD Drivers
• Manufacturer: Maxim Integrated Products

Specifications of MAX1997ETJ

• Dc: 0618
• Lead Free Status / Rohs Status: No

(Circuit of Figure 1, V
unless otherwise noted.)
Quintuple/Triple-Output TFT LCD Power Supplies
100
100
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
0
0
1
1
750kHz OPERATION
L = 4.7µH COILCRAFT LPO25061B-472
C
STEP-UP REGULATOR EFFICIENCY
STEP-UP REGULATOR EFFICIENCY
OUT
vs. LOAD CURRENT (V
= 3 x 4.7µF/10V X7R CERAMIC
vs. LOAD CURRENT
LOAD CURRENT (mA)
LOAD CURRENT (mA)
10
10
_______________________________________________________________________________________
V
V
V
V
IN
IN
IN
IN
V
= 5.5V
= 3.3V
= 2.7V
V
IN
IN
= 2.7V
IN
= 3.3V
= 5.5V
with Fault Protection and VCOM Buffer
= 3.3V, V
100
100
MAIN
= 9V)
MAIN
1000
1000
= 9V, V
1700
1500
1300
1100
STEP-UP REGULATOR LOAD TRANSIENT RESPONSE
900
700
500
300
9.1
9.0
8.9
8.8
8.7
8.6
8.5
SWITCHING FREQUENCY vs. INPUT VOLTAGE
C
A
B
(WITHOUT LAG COMPENSATION, FIGURE 1)
G_ON
2.5
STEP-UP REGULATOR OUTPUT VOLTAGE
1
A: I
B: V
C: INDUCTOR CURRENT, 500mA/div
V
I
MAIN
MAIN
MAIN
MAIN
vs. LOAD CURRENT (V
3.0
= 200mA
= 9V
= 20V, V
= 0 TO 200mA, 200mA/div
= 9V, 50mV/div, AC-COUPLED
FREQUENCY = OPEN
STEP-UP REGULATOR
FREQUENCY = 0
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
3.5
10
10µs/div
FREQUENCY = V
G_OFF
4.0
V
IN
V
Typical Operating Characteristics
IN
V
= 2.7V
IN
= 3.3V
4.5
= 5.5V
100
MAIN
= -7V, V
IN
= 9V)
MAX1997 toc07
5.0
LOGIC
1000
5.5
200mA
0
9V
8.95V
1A
0.5A
0
= 2.5V, V
100
90
80
70
60
50
40
30
20
10
0
A
B
C
STEP-UP REGULATOR NORMAL OPERATION
1
A: V
B: V
C: INDUCTOR CURRENT, 1A/div
STEP-UP REGULATOR EFFICIENCY
vs. LOAD CURRENT (V
LX
MAIN
, 5V/div
GAMMA
= 9V, 20mV/div, AC-COUPLED
LOAD CURRENT (mA)
10
(200mA LOAD)
1µs/div
= 8.6V, T
V
IN
MAIN
= 2.7V
100
V
A
IN
= 13V)
V
MAX1997 toc06
= 5.5V
IN
= +25°C,
= 3.3V
1000
10V
5V
0
9.02V
9V
8.98V
1A
0
7