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MAX8739 データシートの表示(PDF) - Maxim Integrated

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MAX8739 Datasheet PDF : 19 Pages
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MAX8739
TFT, LCD, DC-DC Converter with
Operational Amplifiers
Electrical Characteristics (continued)
(VIN = 2.5V, VSUP = 10V, VSRC = 28V, FREQ = CTL = IN, PGND = AGND = 0, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
POSITIVE GATE-DRIVER TIMING AND CONTROL SWITCHES
DEL Capacitor Charge Current
DEL Turn-On Threshold
During startup, VDEL = 1V
4
1.178
6
µA
1.302
V
CTL Input-Low Voltage
CTL Input-High Voltage
SRC Input-Voltage Range
VIN = 1.8V to 5.5V
VIN = 1.8V to 2.4V
VIN = 2.4V to 5.5V
0.6
V
1.4
V
2.0
28
V
SRC Input Current
DRN Input Current
VDRN = 8V, CTL = AGND, VDEL = 1.5V
VDRN = 8V, CTL = IN, VDEL = 1.5V
VDRN = 8V, CTL = AGND, VDEL = 1.5V
30
µA
180
150
µA
SRC-to-COM Switch
On-Resistance
VDEL = 1.5V, CTL = IN
30
DRN-to-COM Switch
On-Resistance
VDEL = 1.5V, CTL = AGND
60
Note 1: Specifications to -40°C are guaranteed by design, not production tested.
Typical Operating Characteristics
(Circuit of Figure 1, VIN = 2.5V, VMAIN = 8V, FREQ = IN, TA = +25°C, unless otherwise noted.)
STEP-UP REGULATOR EFFICIENCY
vs. LOAD CURRENT
100
90
VIN = 5V
80
70
60
VIN = 3.3V
50
40
30
20
10
0
1
VIN = 1.8V
fSW = 1.2MHz
VOUT = 8V
L = 3.0µH
10
100
1000
LOAD CURRENT (mA)
STEP-UP REGULATOR EFFICIENCY
vs. LOAD CURRENT
100
90
VIN = 5V
80
70
VIN = 3.3V
60
50
40
VIN = 1.8V
30
20
10
0
1
fSW = 600MHz
VOUT = 8V
L = 6.2µH
10
100
1000
LOAD CURRENT (mA)
STEP-UP REGULATOR
LOAD REGULATION
0.5
0
-0.5
VIN = 1.8V
-1.0
VIN = 5V
-1.5
VIN = 3.3V
-2.0 fSW = 1.2MHz
VOUT = 8V
-2.5
1
10
100
1000
LOAD CURRENT (mA)
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