MAX8571 MAXIM [Maxim Integrated Products], MAX8571 Datasheet - Page 3

• Manufacturer Part Number: MAX8571
• Description: High-Efficiency LCD Boost with True Shutdown
• Manufacturer: MAXIM [Maxim Integrated Products]

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