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| MAX1513 Datasheet, PDF (7/28 Pages) Maxim Integrated Products – TFT-LCD Power-Supply Controllers | |||
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TFT-LCD Power-Supply Controllers
Typical Operating Characteristics
(Circuit of Figure 1, VIN = 5V, VMAIN = 15V, VGON = 25V, VGOFF = -10V, VLOGIC = 3.3V, VGAMMA = 14.7V, TA = +25°C, unless other-
wise noted.)
STEP-UP EFFICIENCY
vs. LOAD CURRENT (1.5MHz)
100
VIN = 5.0V
90
80
VIN = 2.7V VIN = 3.3V
70
60
50
STEP-UP OUTPUT VOLTAGE
vs. LOAD CURRENT
15.1
VIN = 5V
VIN = 15V
15.0
fOSC = 1.5MHz
14.9
14.8
14.7
STEP-UP REGULATOR
LOAD-TRANSIENT RESPONSE
MAX1513/14 toc03
VMAIN
100mV
AC-COUPLED
IMAIN
500mA/div
0.1A
IL
1A/div
40
0
100 200 300 400 500 600 700 800
LOAD CURRENT (mA)
14.6
0
100 200 300 400 500 600 700
LOAD CURRENT (mA)
0A
4µs/div
STEP-UP REGULATOR
PULSED-LOAD-TRANSIENT RESPONSE
MAX1513/14 toc04
VMAIN
100mV/div
AC-COUPLED
4µs/div
IMAIN
1A/div
0.1A
IL
1A/div
0A
STEP-UP REGULATOR SOFT-START
MAX1513/14 toc05
VMAIN
5V/div
0V
400µs/div
IL
2A/div
0A
POWER-UP SEQUENCE
MAX1513/14 toc06
VLOGIC
5V/div
0V
0V
VMAIN
20V/div
VGON
20V/div
0V
0V
VGOFF
10V/div
4ms/div
VGAMMA
20V/div
0V
LINEAR REGULATOR REG L
LOAD-TRANSIENT RESPONSE
MAX1513/14 toc07
BUFFER-AMPLIFIER SUPPLY CURRENT
vs. SUPPLY VOLTAGE
1.2
BUFFER-AMPLIFIER SMALL-SIGNAL
STEP RESPONSE
MAX1513/14 toc09
1.0
VLOGIC
50mV/div
AC-COUPLED
0.8
0.6
VFBPB
50mV/div
AC-COUPLED
20µs/div
ILOGIC
500mA/div
0mA
0.4
0.2
0
4
NO LOAD
VFBPB = VSUPB / 2
6
8
10
12
14
SUPPLY VOLTAGE (V)
400ns/div
VOUTB
50mV/div
AC-COUPLED
_______________________________________________________________________________________ 7
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