MAX686 查看數據表（PDF） - Maxim Integrated
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MAX686 Datasheet PDF : 16 Pages
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DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
__________________________________________Typical Operating Characteristics
(Circuits of Figures 1 and 2, VCC = VDD = VIN = +5V, L1 = 22µH, SHDN = VCC, CREF = 0.1µF, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
(VOUT = +24V)
95
A
90
B
C
85
E
D
F
80
75
70
65
60
0.1
A: VIN = 12V, ISET = VCC
B: VIN = 12V, ISET = GND
C: VIN = 5V, ISET = VCC
D: VIN = 5V, ISET = GND
E: VIN = 3V, ISET = GND
F: VIN = 3V, ISET = VCC
1
10
100
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
(VOUT = +12V)
95
AB
90
CD
85
EF
80
75
70
65
60
0.1
A: VIN = 9V, ISET = VCC
B: VIN = 9V, ISET = GND
C: VIN = 5V, ISET = VCC
D: VIN = 5V, ISET = GND
E: VIN = 3V, ISET = GND
F: VIN = 3V, ISET = VCC
1
10
100
1000
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
(VOUT = -12V)
85
A: VIN = 9V, ISET = GND
B: VIN = 9V, ISET = VCC
80
75
AB
C
D
70
65
60
0.1
E
F
C: VIN = 5V, ISET = GND
D: VIN = 5V, ISET = VCC
E: VIN = 3V, ISET = GND
F: VIN = 3V, ISET = VCC
1
10
100
LOAD CURRENT (mA)
85
80
75
70
65
60
55
50
0.1
EFFICIENCY vs. LOAD CURRENT
(VOUT = -18V)
B
C
A
D
E
F
A: VIN = 9V, ISET = GND
B: VIN = 9V, ISET = VCC
C: VIN = 5V, ISET = GND
D: VIN = 5V, ISET = VCC
E: VIN = 3V, ISET = GND
F: VIN = 3V, ISET = VCC
1
10
100
LOAD CURRENT (mA)
MAXIMUM OUTPUT CURRENT vs.
INPUT VOLTAGE (VOUT = +12V, +24V)
1000
A
100
B
C
D
10
A: VOUT = 12V, ISET = VCC
B: VOUT = 12V, ISET = GND
C: VOUT = 24V, ISET = VCC
D: VOUT = 24V, ISET = GND
1
0 2 4 6 8 10 12 14
INPUT VOLTAGE (V)
MAXIMUM OUTPUT CURRENT vs.
INPUT VOLTAGE (VOUT = -12V, -18V)
100
A
A&C
B&D
B
C
D
10
A: VOUT = -12V, ISET = VCC
B: VOUT = -18V, ISET = VCC
C: VOUT = -12V, ISET = GND
D: VOUT = -18V, ISET = GND
1
0 2 4 6 8 10 12 14 16 18
INPUT VOLTAGE (V)
INPUT CURRENT
vs. INPUT VOLTAGE
1000
100
10
1
0
VCC = VIN = VDD
INPUT CURRENT = ICC + IDD
VOUT = 18V, NO LOAD
1
2
3
4
5
6
INPUT VOLTAGE (V)
REFERENCE VOLTAGE
vs. LOAD CURRENT
1.252
1.251
1.250
VIN = VCC = 5V
CREF = 0.1µF
1.249
VOUT
50mV/div
AC-COUPLED
OUTPUT VOLTAGE RIPPLE
MAX686 TOC09
ISET = GND
1.248
1.247
1.246
1.245
1.244
0
VOUT
50mV/div
AC-COUPLED
VOUT = 24V
ILOAD = 5mA
20 40 60 80 100 120 140
LOAD CURRENT (µA)
20µs/div
ISET = VCC
_______________________________________________________________________________________ 5
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