MAX8570(2004) データシートの表示（PDF） - Maxim Integrated
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MAX8570 Datasheet PDF : 10 Pages
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High-Efficiency LCD Boost
with True Shutdown
Typical Operating Characteristics (continued)
(MAX8571, VCC = 3.6V, VOUT = 18V, Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. BATTERY VOLTAGE
(FIGURE 4)
100
5mA LOAD
90
EFFICIENCY vs. LOAD CURRENT
WITH 22µH INDUCTOR
100
MAX8570, MURATA LQH32CN220K23
90
EFFICIENCY vs. LOAD CURRENT
WITH 47µH INDUCTOR
100
MAX8570, L1 = MURATA LQH32CN470K23
90
80
1mA LOAD
70
60
80
70
MAX8571, MURATA LQH32CN220K23
MAX8574, TOKO A914BYW-220M
60
80
70 MAX8571, L1 = TOKO A914BYW-470M
60
50
VCC = 3.6V
50
50
L1 = MURATA LQH32CN220K23
40
40
40
0 2 4 6 8 10 12
0.1
1
10
100
0.1
1
10
100
BATTERY VOLTAGE (V)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
PEAK INDUCTOR CURRENT LIMIT
vs. SUPPLY VOLTAGE
700
600
MAX8574
500
400
MAX8571
300
200
MAX8570
100
0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. LOAD CURRENT
120
100
80
60
40
20
0
0
L1 = MURATA LQH32CN220K23
5
10
15
LOAD CURRENT (mA)
NO-LOAD CURRENT vs. SUPPLY VOLTAGE
80
70 R1 = 7.87MΩ
R2 = 576kΩ
60
R1 = 3.9MΩ
R2 = 287kΩ
50
40
MAX8573,
FIGURE 3
30
20
L1 = MURATA
10 LQH32CN220K23
NO SWITCHING
0
0123456
SUPPLY VOLTAGE (V)
LINE TRANSIENT 3V TO 5.5V (MAX8571)
MAX8570/71/73/74/75 toc13
LINE TRANSIENT 3V TO 5.5V
(FIGURE 3, MAX8573)
MAX8570/71/73/74/75 toc14
200mV/div
VOUT
(AC-COUPLED)
VOUT
200mV/div
(AC-COUPLED)
VCC
VCC
2V/div
2V/div
0
0
100µs/div
3.6kΩ LOAD, R1 = 3.9MΩ, R2 = 287kΩ
3kΩ LOAD
100µs/div
4 _______________________________________________________________________________________
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