MAX1542 Datasheet, PDF (6/20 Pages) Maxim Integrated Products – TFT LCD DC-to-DC Converter with Operational Amplifiers

TFT LCD DC-to-DC Converter with
Operational Amplifiers
Typical Operating Characteristics
(V_IN = 3.3V, V_MAIN = 8V, f_OSC = 1.2MHz, T_A = +25°C, unless otherwise noted.)
STEP-UP REGULATOR EFFICIENCY
vs. LOAD CURRENT (V_MAIN = 8V)
95
90 ^MAX1543
f_OSC = 1.2MHz
85 ^{L = 4.7µH}
80
V_IN = 5V
75
V_IN = 3.3V
70
65
V_IN = 2.7V
60
55
50
1
10
100
1000
LOAD CURRENT (mA)
STEP-UP REGULATOR EFFICIENCY
vs. LOAD CURRENT (V_MAIN = 8V)
95
90 ^MAX1543
f_OSC = 640kHz
85 ^{L = 10µH}
V_IN = 5V
80
75
V_IN = 5V
70
65
V_IN = 3.3V
V_IN = 2.7V
60
55
50
1
10
100
1000
LOAD CURRENT (mA)
STEP-UP REGULATOR OUTPUT VOLTAGE
vs. LOAD CURRENT (V_MAIN = 8V)
8.1
8.0
7.9
7.8
7.7
7.6
V_IN = 3.3V
f_OSC = 1.2MHz
7.5
1
10
100
1000
LOAD CURRENT (mA)
STEP-UP REGULATOR SUPPLY CURRENT
vs. SUPPLY VOLTAGE
0.7
0.6
CURRENT INTO INDUCTOR
0.5
0.4
CURRENT INTO IN PIN
0.3
0.2 ^{NO LOAD}
f_OSC = 1.2MHz
0.1
R₁ = 75kΩ
R₂ = 13.7kΩ
SUP DISCONNECTED
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
STEP-UP REGULATOR SUPPLY CURRENT
vs. TEMPERATURE
2.0
NO LOAD
V_IN = 3.3V
1.6 ^fOSC ^{= 1.2MHz}
R₁ = 75kΩ
R₂ = 13.7kΩ
1.2 ^{SUP DISCONNECTED}
CURRENT INTO INDUCTOR
0.8
CURRENT INTO IN PIN
0.4
0
-40 -15 10
35
60
85
TEMPERATURE (°C)
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
1400
MAX1543
I_MAIN = 200mA
1200
1000
FREQ = IN
800
FREQ = AGND
600
400
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
SUP SUPPLY CURRENT
vs. SUP VOLTAGE
1.75
NO LOAD
BUFFER CONFIGURATION
POS_ = V_SUP/2
1.50
1.25
SUP SUPPLY CURRENT
vs. TEMPERATURE
2.0
V_SUP = 13V
1.6
V_SUP = 8V
1.00
0.75
4.5 6.0 7.5 9.0 10.5 12.0 13.5
V_SUP (V)
1.2
V_SUP = 5V
0.8
-40 -15
NO LOAD
BUFFER CONFIGURATION
V_POS = V_SUP/2
10
35
60
85
TEMPERATURE (°C)
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