MAX8795A Maxim Integrated Products, MAX8795A Datasheet - Page 11

• Manufacturer Part Number: MAX8795A
• Description: TFT-LCD DC-DC Converter
• Manufacturer: Maxim Integrated Products

w
w
(Circuit of Figure 1, V
1.2500
1.2495
1.2490
1.2485
1.2480
1.2475
1.2470
w
A: V
B: V
C: INDUCTOR CURRENT, 1A/div
0
STEP-UP REGULATOR SOFT-START
IN
MAIN
REF VOLTAGE LOAD REGULATION
.
, 5V/div
, 5V/div
10
D
LOAD CURRENT (µA)
(HEAVY LOAD)
IN
20
______________________________________________________________________________________
2ms/div
a
= 5V, V
30
t
MAIN
MAX8795A toc04
a
40
= 14V, V
S
50
A
0V
B
0V
C
0A
GON
h
TFT-LCD DC-DC Converter with
-0.2
-0.4
-0.6
-0.8
Typical Operating Characteristics (continued)
= 25V, V
0
e
25
GATE-ON REGULATOR LINE REGULATION
A: LOAD CURRENT, 1A/div
B: V
C: INDUCTOR CURRENT, 1A/div
MAIN
STEP-UP REGULATOR PULSED
LOAD-TRANSIENT RESPONSE
GOFF
e
, 200mV/div, AC-COUPLED
26
INPUT VOLTAGE (V)
= -10V, T
t
27
10µs/div
4
Operational Amplifiers
28
A
= +25°C, unless otherwise noted.)
U
I
POS
29
MAX8795A toc05
= 20mA
.
30
c
13.9V
A
50mA
0A
B
C
o
-0.1
-0.3
-0.5
TIMER-DELAYED OVERLOAD PROTECTION
GATE-ON REGULATOR LOAD REGULATION
0
A: V
B: INDUCTOR CURRENT, 1A/div
m
MAIN
, 2V/div
5
LOAD CURRENT (mA)
40ms/div
10
I
BOOST =
15
MAX8795A toc06
200mA
20
11
A
B
0A
0U