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
ELECTRICAL CHARACTERISTICS (continued)
(VCC = VSHDN = 3.6V, SW floating, VFB = 1.3V (MAX8570/MAX8571/MAX8574) or VOUT = 16V (MAX8572/MAX8573/MAX8575), TA =
-40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
SW PMOS Current Limit
SW PMOS On-Resistance
SW PMOS Leakage Current
SW Soft-Start Time
VCC = 3.6V, VSW = 0V, VFB = 0V, ICC (peak)
VCC = 3.6V, VSW = 0V, VFB = 0V, ICC (average)
0.45 0.75 1.10
A
0.15 0.30 0.60
VCC = 2.7V, VFB = 0V, ISW = 100mA
1.5
2.5
Ω
SW = GND, VCC = 5.5V, VFB = 0V
TA = +25°C
TA = -40°C to +85°C
0.01
1
µA
0.02
VCC = 2.7V, CSW = 4.7µF
0.2
1
ms
Note 1: Parameters are production tested at TA = +25°C. Limits over temperature are guaranteed by design.
Note 2: Specified currents are measured at DC. Actual LX current limits are slightly higher in circuit due to current-limit comparator
delay. Actual currents (with 2µH) are 110mA (MAX8570/MAX8572), 250mA (MAX8571/MAX8573), and 500mA
(MAX8574/MAX8575).
Typical Operating Characteristics
(MAX8571, VCC = 3.6V, VOUT = 18V, Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE (MAX8571)
18.5
18.4
5mA LOAD
18.3
18.2
18.1
18.0
1mA LOAD
17.9
17.8
17.7
17.6 L1 = MURATA LQH32CN220K23
R1 = 3.9MΩ, R2 = 287kΩ
17.5
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE
vs. LOAD CURRENT
19.0
L1 = MURATA LQH32CN220K23
18.8
18.6 MAX8574, R1 = 1.1MΩ, R2 = 75kΩ, C4 = 4.7pF
18.4
18.2
18.0
17.8
MAX8570 MAX8571
17.6
R1 = 3.9MΩ, R2 = 287kΩ, C4 = 10pF
17.4
0
5
10
15
20
25
LOAD CURRENT (mA)
OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE (FIGURE 3, MAX8573)
15.5
15.4
15.3
15.2
1mA LOAD
15.1
15.0
14.9
5mA LOAD
14.8
14.7
14.6
L1 = MURATA LQH32CN220K23
14.5
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE (MAX8574)
19.0
18.8
5mA LOAD
18.6
18.4
18.2
18.0
20mA LOAD
17.8
17.6
17.4
17.2 L1 = TOKO S1024-100M
R1 = 1.1MΩ, R2 = 75kΩ, C4 = 4.7pF
17.0
3.1 3.4 3.7 4.0 4.3 4.6 4.9
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE vs. TEMPERATURE
18.4
18.3
18.2
18.1
18.0
17.9
17.8
17.7
1mA LOAD
17.6
-40 -15
10
35
60
85
TEMPERATURE (°C)
EFFICIENCY vs. SUPPLY VOLTAGE
100
95
L1 = TOKO A914BYW-470M
90 47µH, 1mA LOAD
47µH, 5mA LOAD
85
80
22µH, 1mA LOAD
22µH, 5mA LOAD
75
L1 = MURATA LQH32CN220K23
70
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________ 3
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