MAX8570–MAX8575
High-Efficiency LCD Boost
with True Shutdown
_______________________________________________________________________________________ 3
EFFICIENCY vs. SUPPLY VOLTAGE
MAX8570/71/73/74/75 toc06
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
5.14.74.33.93.53.1
75
80
85
90
95
100
70
2.7 5.5
L1 = TOKO A914BYW-470M
47µH, 1mA LOAD
47µH, 5mA LOAD
L1 = MURATA LQH32CN220K23
22µH, 5mA LOAD
22µH, 1mA LOAD
Typical Operating Characteristics
(MAX8571, V
CC
= 3.6V, V
OUT
= 18V, Circuit of Figure 2, T
A
= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE (MAX8571)
MAX8570/71/73/74/75 toc01
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE (V)
5.14.73.9 4.33.53.1
17.6
17.7
17.8
17.9
18.0
18.1
18.2
18.3
18.4
18.5
17.5
2.7 5.5
L1 = MURATA LQH32CN220K23
R1 = 3.9MΩ, R2 = 287kΩ
5mA LOAD
1mA LOAD
OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE (FIGURE 3, MAX8573)
MAX8570/71/73/74/75 toc02
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE (V)
5.14.73.9 4.33.53.1
14.6
14.7
14.8
14.9
15.0
15.1
15.2
15.3
15.4
15.5
14.5
2.7 5.5
L1 = MURATA LQH32CN220K23
5mA LOAD
1mA LOAD
OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE (MAX8574)
MAX8570/71/73/74/75 toc03
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE (V)
4.64.34.03.73.4
17.2
18.2
18.0
17.8
17.6
17.4
18.4
18.6
18.8
19.0
17.0
3.1 4.9
L1 = TOKO S1024-100M
R1 = 1.1MΩ, R2 = 75kΩ, C4 = 4.7pF
5mA LOAD
20mA LOAD
OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX8570/71/73/74/75 toc04
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
20155 10
17.6
17.8
18.0
18.2
18.4
18.6
18.8
19.0
17.4
025
L1 = MURATA LQH32CN220K23
R1 = 3.9MΩ, R2 = 287kΩ, C4 = 10pF
MAX8570 MAX8571
MAX8574, R1 = 1.1MΩ, R2 = 75kΩ, C4 = 4.7pF
OUTPUT VOLTAGE vs. TEMPERATURE
MAX8570/71/73/74/75 toc05
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
603510-15
17.7
17.8
17.9
18.0
18.1
18.2
18.3
18.4
17.6
-40 85
1mA LOAD
Note 1: Parameters are production tested at T
A
= +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).
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= V
SHDN
= 3.6V, SW floating, V
FB
= 1.3V (MAX8570/MAX8571/MAX8574) or V
OUT
= 16V (MAX8572/MAX8573/MAX8575), T
A
=
-40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
V
CC
= 3.6V, V
SW
= 0V, V
FB
= 0V, I
CC
(peak)
0.45 0.75 1.10
SW PMOS Current Limit
V
CC
= 3.6V, V
SW
= 0V, V
FB
= 0V, I
CC
(average)
0.15 0.30 0.60
A
SW PMOS On-Resistance V
CC
= 2.7V, V
FB
= 0V, I
SW
= 100mA 1.5 2.5 Ω
T
A
= +25°C
0.01
SW = GND, V
CC
= 5.5V, V
FB
= 0V
T
A
= -40°C to +85°C 0.02
µA
SW Soft-Start Time V
CC
= 2.7V, C
SW
= 4.7µF 0.2 1 ms
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