MAX8739(2006) Просмотр технического описания (PDF) - Maxim Integrated
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MAX8739 Datasheet PDF : 19 Pages
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TFT, LCD, DC-DC Converter with
Operational Amplifiers
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = 2.5V, VMAIN = 8V, FREQ = IN, TA = +25°C, unless otherwise noted.)
TIMER DELAY LATCH
RESPONSE TO OVERLOAD
A
0V
B
0V
C
53ms
OA
POWER-UP SEQUENCE
A
B
C
D
E
10ms/div
A: VIN, 2V/div
B: VMAIN, 5V/div
C: INDUCTOR CURRENT, 2A/div
A: VLDO, 5V/div
B: VMAIN, 5V/div
C: VSRC, 20V/div
D: VGON, 20V/div
E: VGOFF, 5V/div
2ms/div
SUP SUPPLY CURRENT
vs. SUP VOLTAGE
10
SWITCHING
8
6
4
NOT SWITCHING
2
0
4
6
8
10
12
SUP VOLTAGE (V)
SUP SUPPLY CURRENT
vs. TEMPERATURE
10
VSUP = 8V
VIN = 3.3V
8
SWITCHING
6
4
NOT SWITCHING
2
0
-50 -20
10
40
70 100
TEMPERATURE (°C)
OPERATIONAL-AMPLIFIER
FREQUENCY RESPONSE
4
BUFFER CONFIGURATION
2
0
-2
-4
-6 RL = 10kΩ
-8
CL = 1000pF
AV = 1
VSUP = 8V
-10
100k
1M
10M
FREQUENCY (Hz)
OPERATIONAL-AMPLIFIER RAIL-TO-RAIL
INPUT/OUTPUT
BUFFER CONFIGURATION
A
0V
B
0A
10µs/div
A: BUFFER INPUT, 5V/div
B: BUFFER OUTPUT, 5V/div
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