MAX1747EUP 查看數據表（PDF） - Maxim Integrated
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MAX1747EUP Datasheet PDF : 13 Pages
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Triple Charge-Pump TFT LCD
DC-DC Converter
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = VSUPM = +3.3V, TA = +25°C, unless otherwise noted.)
MAXIMUM POSITIVE CHARGE-PUMP
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
34
VPOS(NOMINAL) = 32V
28
IPOS = 1mA
22
200mA
100mA
0
LOAD TRANSIENT
MAX1747 toc14
IOUT
100mA/div
16
10
4
3
IPOS = 10mA
5
7
9
11
13
VSUPP (V)
RIPPLE WAVEFORM
MAX1747 toc15
VOUT
20mV/div
VNEG
10mV/div
VPOS
10mV/div
400ns/div
VOUT = +5.0V,IOUT = 200mA
VNEG = -7V, INEG = 10mA
VPOS = +12V, IPOS = 5mA
STARTUP WAVEFORM (200mA LOAD)
MAX1747 toc17
2V
VON
2V/div
0
4V
VCXP
2V/div
2V
4V
2V
VOUT
2V/div
0
5.05V
5V
4.95V
VOUT
50mV/div
40µs/div
VIN = 3.3V, VOUT = 5.0V
ROUT = 500Ω TO 25Ω
CINTG = 1500pF
STARTUP WAVEFORM (NO LOAD)
MAX1747 toc16
2V
VON
2V/div
0
4V
VCXP
2V/div
2V
4V
2V
VOUT
2V/div
0
1ms/div
VOUT = 5V, NO LOAD
ON CONNECTED TO SHDN THROUGH
A 58kΩ RESISTOR
POWER-UP SEQUENCE
MAX1747 toc18
2V
VON
2V/div
0
5V
VMAIN
5V/div
0
VNEG
-10V
10V/div
10V
VPOS
10V/div
0
1ms/div
VOUT = 5V, ROUT = 25Ω (200mA)
ON CONNECTED TO SHDN THROUGH
A 58kΩ RESISTOR
2ms/div
VMAIN = 5V, VNEG = -7V, VPOS = 12V
ON CONNECTED TO SHDN THROUGH
A 58kΩ RESISTOR
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