MAX1677(1998) データシートの表示（PDF） - Maxim Integrated
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MAX1677
(Rev.:1998)
(Rev.:1998)
Maxim Integrated
MAX1677 Datasheet PDF : 16 Pages
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Compact, High-Efficiency, Dual-Output
Step-Up and LCD Bias DC-DC Converter
Typical Operating Characteristics
(Circuits of Figures 2 and 3, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
(VOUT = 3.3V)
100
PFM MODE
A
C
A = VIN = 2.4V
B = VIN = 1.2V
90
80
B
D
70
PWM MODE
C = 2.4V
D = 1.2V
60
0.1
1
10
100
1000
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
(VOUT = 5V)
100
D
80
60
40
20
0
0.1
A
E
F
B PWM MODE
A: VIN = 3.6V
C B: VIN = 2.4V
C: VIN = 1.2V
PFM MODE
D: VIN = 3.6V
E: VIN = 2.4V
F: VIN = 1.2V
1
10
100
1000
LOAD CURRENT (mA)
MAXIMUM LOAD CURRENT
vs. BATTERY INPUT VOLTAGE
(PWM MODE)
700
600
500
400
300
VOUT = 3.3V
200
VOUT = 5V
100
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
INPUT VOLTAGE (V)
EFFICIENCY vs. LOAD CURRENT
(LCD VOUT = 12V)
100
CIRCUIT OF FIGURE 2
90
A: VIN = 3.6V
B: VIN = 2.4V
C: VIN = 1.2V
80
A
70
B
60
C
50
EFFICIENCY vs. LOAD CURRENT
(LCD VOUT = 20V)
100
CIRCUIT OF FIGURE 2
A: VIN = 3.6V
90
B: VIN = 2.4V
C: VIN = 1.2V
80
70
A
B
60
C
1.2550
REFERENCE VOLTAGE
vs. REFERENCE CURRENT
1.2525
1.2500
1.2475
40
0.1
1
10
LOAD CURRENT (mA)
50
100
0.1
1
10
LOAD CURRENT (mA)
1.2450
100
0
20
40
60
80 100
REFERENCE CURRENT (µA)
LOAD CURRENT
vs. START-UP VOLTAGE
450
VOUT = 3.3V
400 TESTED WITH
350 RESISTIVE LOAD
PWM
300
250
200
150
100
PFM
50
0
0 0.5 1.0 1.5 2.0 2.5 3.0
START-UP VOLTAGE (V)
0.20
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0
0
NO-LOAD SUPPLY CURRENT vs.
INPUT VOLTAGE (LCD OFF)
VOUT = 3.3V
PFM MODE
LCD OFF
0.5 1.0 1.5 2.0 2.5 3.0 3.5
INPUT VOTAGE (V)
NO-LOAD SUPPLY CURRENT vs.
INPUT VOLTAGE (LCD ON)
1.1
1.0
VOUT = 3.3V
PFM MODE
0.9
VLCD = -20V
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
INPUT VOLTAGE (V)
_______________________________________________________________________________________ 5
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