Datasheet

MAX1513/MAX1514
TFT-LCD Power-Supply Controllers
_______________________________________________________________________________________ 7
Typical Operating Characteristics
(Circuit of Figure 1, V
IN
= 5V, V
MAIN
= 15V, V
GON
= 25V, V
GOFF
= -10V, V
LOGIC
= 3.3V, V
GAMMA
= 14.7V, T
A
= +25°C, unless other-
wise noted.)
STEP-UP OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX1513/14 toc02
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
600500400300200100
14.7
14.8
14.9
15.0
15.1
14.6
0700
V
IN
= 5V
V
IN
= 15V
f
OSC
= 1.5MHz
STEP-UP EFFICIENCY
vs. LOAD CURRENT (1.5MHz)
MAX1513/14 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
700600500400300200100
50
60
70
80
90
100
40
0800
V
IN
= 5.0V
V
IN
= 2.7V
V
IN
= 3.3V
STEP-UP REGULATOR
LOAD-TRANSIENT RESPONSE
MAX1513/14 toc03
4
µ
s/div
V
MAIN
100mV
AC-COUPLED
I
MAIN
500mA/div
0.1A
I
L
1A/div
0A
STEP-UP REGULATOR
PULSED-LOAD-TRANSIENT RESPONSE
MAX1513/14 toc04
4
µ
s/div
V
MAIN
100mV/div
AC-COUPLED
I
MAIN
1A/div
0.1A
I
L
1A/div
0A
STEP-UP REGULATOR SOFT-START
MAX1513/14 toc05
400
µ
s/div
V
MAIN
5V/div
0V
I
L
2A/div
0A
POWER-UP SEQUENCE
MAX1513/14 toc06
4ms/div
V
LOGIC
5V/div
V
MAIN
20V/div
V
GON
20V/div
V
GOFF
10V/div
V
GAMMA
20V/div
0V
0V
0V
0V
0V
LINEAR REGULATOR REG L
LOAD-TRANSIENT RESPONSE
MAX1513/14 toc07
20µs/div
V
LOGIC
50mV/div
AC-COUPLED
I
LOGIC
500mA/div
0mA
BUFFER-AMPLIFIER SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX1513/14 toc08
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
121086
0.2
0.4
0.6
0.8
1.0
1.2
0
414
NO LOAD
V
FBPB
= V
SUPB
/ 2
BUFFER-AMPLIFIER SMALL-SIGNAL
STEP RESPONSE
MAX1513/14 toc09
400ns/div
V
FBPB
50mV/div
AC-COUPLED
V
OUTB
50mV/div
AC-COUPLED