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MAX8784ETL+
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P24
MAX8784
Step-Up Regulator
, Inter
nal Char
ge Pumps, Switch
Contr
ol, and Operational Amplifier for TFT LCDs
_______________________________________________________________________________________
7
STEP-UP REGULATOR EFFICIENCY
vs. LOAD CURRENT
MAX8784 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
600
400
200
79
83
87
91
95
75
08
0
0
f
OSC
= 1.2MHz
VIN = 5.0V
STEP-UP REGULATOR LOAD REGULATION
MAX8784 toc02
LOAD CURRENT (mA)
AVDD ERROR (%)
600
400
200
-0.6
-0.2
0.2
0.6
1.0
-1.0
0
800
V
CC
QUIESCENT CURRENT
vs. V
CC
MAX8784 toc03
V
CC
(V)
I
VCC
(mA)
5.6
4.8
5.2
4.4
1
2
3
4
5
0
4.0
6.0
SWITCHING
NOT SWITCHING
V
CC
QUIESCENT CURRENT
vs. TEMPERATURE
MAX8784 toc04
TEMPERATURE (
°
C)
I
VCC
(mA)
60
35
10
-15
1
2
3
4
5
0
-40
85
SWITCHING
NOT SWITCHING
STEP-UP REGULATOR SOFT-START
(HEAVY LOAD)
MAX8784 toc05
10ms/div
AVDD
LX: 10V/div
I
LOAD
: 500mA/div
I
L
: 20A/div
AVDD: 10V/div
I
L
I
LOAD
LX
STEP-UP REGULATOR LOAD
TRANSIENT RESPONSE
MAX8784 toc06
20
µ
s/div
AVDD
I
LOAD
: 200mA/div
I
L
: 1A/div
AVDD: 100mV/div
(AC-COUPLED)
I
L
I
LOAD
STEP-UP REGULATOR PULSED
LOAD TRANSIENT RESPONSE
MAX8784 toc07
10
µ
s/div
AVDD : 200mV/div
(AC-COUPLED)
I
L
: 1A/div
I
AVDD
: 1A/div
I
AVDD
: 0.3A TO 1.3A,
2
µ
s PULSE
AVDD
I
L
I
AVDD
0A
0A
T
ypical Operating Characteristics
(Circuit of Figure 1, V
CC
= 5V, AVDD = 14V, V
POUT
= 28V, VGOFF = -9V, T
A
= +25°C, unless otherwise noted.)
MAX8784
Step-Up Regulator
, Inter
nal Char
ge Pumps, Switch
Contr
ol, and Operational Amplifier for TFT LCDs
8
_______________________________________________________________________________________
TIMER-DELAY LATCH RESPONSE
TO OVERLOAD
MAX8784 toc08
10ms/div
AVDD
AVDD: 10V/div
LX: 10V/div
I
L
: 5A/div
I
L
LX
SWITCHING FREQUENCY vs. V
CC
MAX8784 toc09
V
CC
(V)
SWITCHING FREQUENCY (MHz)
5.6
5.2
4.8
4.4
1.1
1.2
1.3
1.4
1.5
1.0
4.0
6.0
REFERENCE LOAD REGULATION
MAX8784 toc10
I
REF
(
µ
A)
V
REF
(V)
40
30
20
10
1.2502
1.2504
1.2506
1.2508
1.2510
1.2500
05
0
SUP SUPPLY CURRENT
vs. SUP VOLTAGE
MAX8784 toc11
V
SUP
(V)
I
SUP
(mA)
18
14
16
12
8.2
8.4
8.6
8.8
9.0
8.0
10
20
ALL OUTPUTS ENABLED
POSITIVE CHARGE-PUMP REGULATOR
LINE REGULATION
MAX8784 toc12
V
SUP
(V)
OUTPUT-VOLTAGE ERROR (%)
18
12
15
9
-1
0
1
2
-2
62
1
POSITIVE CHARGE-PUMP REGULATOR
LOAD REGULATION
MAX8784 toc13
I
POUT
(mA)
OUTPUT VOLTAGE ERROR (%)
50
30
40
20
10
-1
0
1
2
-2
06
0
NEGATIVE CHARGE-PUMP REGULATOR
LINE REGULATION
MAX8784 toc114
V
SUP
(V)
OUTPUT-VOLTAGE ERROR (%)
16
18
12
14
10
-1
0
1
2
-2
82
0
NEGATIVE CHARGE-PUMP REGULATOR
LOAD REGULATION
MAX8784 toc15
I
VGOFF
(mA)
OUTPUT-VOLTAGE ERROR (%)
200
100
150
50
-1
0
1
2
-2
02
5
0
V
SUP
= 16.0V
V
SUP
= 13.5V
T
ypical Operating Characteristics (continued)
(Circuit of Figure 1, V
CC
= 5V, AVDD = 14V, V
POUT
= 28V, VGOFF = -9V, T
A
= +25°C, unless otherwise noted.)
MAX8784
Step-Up Regulator
, Inter
nal Char
ge Pumps, Switch
Contr
ol, and Operational Amplifier for TFT LCDs
_______________________________________________________________________________________
9
HIGH-VOLTAGE SWITCH
CONTROL FUNCTION
MAX8784 toc16
10
µ
s/div
CTL: 5V/div
GON: 10V/div
CTL
GON
C
GON
= 1.5nF
R
DRN
= 1k
Ω
TO AVDD
OPERATIONAL AMPLIFIER
FREQUENCY RESPONSE
MAX8784 toc17
FREQUENCY ( MHz)
GAIN (dB)
10
1
-6
-3
0
3
6
-9
0.1
100
C
LOAD
= 56pF
C
LOAD
= 15pF
C
LOAD
= 33pF
OPERATIONAL AMPLIFIER
RAIL-TO-RAIL OPERATION
MAX8784 toc18
2
µ
s/div
POS1: 5V/div
OUT1: 5V/div
OUT1
POS1
OPERATIONAL AMPLIFIER
LOAD-TRANSIENT RESPONSE
MAX8784 toc19
2
µ
s/div
V
OUT1
: 200mV/div
I
LOAD
: 100mA/div
V
OUT1
I
LOAD
OPERATIONAL AMPLIFIER
LARGE-SIGNAL RESPONSE
MAX8784 toc20
200ns/div
OUT1: 5V/div
POS1: 5V/div
POS1
OUT1
OPERATIONAL AMPLIFIER
SMALL-SIGNAL STEP RESPONSE
MAX8784 toc21
100ns/div
POS1: 50mV/div (AC-COUPLED)
OUT1: 50mV/div (AC-COUPLED)
POS1
OUT1
T
ypical Operating Characteristics (continued)
(Circuit of Figure 1, V
CC
= 5V, AVDD = 14V, V
POUT
= 28V, VGOFF = -9V, T
A
= +25°C, unless otherwise noted.)
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P24
MAX8784ETL+
Mfr. #:
Buy MAX8784ETL+
Manufacturer:
Maxim Integrated
Description:
Display Drivers & Controllers Reg, CP, Op Amp for TFT LCDs
Lifecycle:
New from this manufacturer.
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