Typical operating characteristics (continued) – Rainbow Electronics MAX8575 User Manual
Page 4
MAX8570–MAX8575
High-Efficiency LCD Boost
with True Shutdown
4
_______________________________________________________________________________________
EFFICIENCY vs. BATTERY VOLTAGE
(FIGURE 4)
MAX8570/71/73/74/75 toc07
BATTERY VOLTAGE (V)
EFFICIENCY (%)
10
8
6
4
2
50
60
70
80
90
100
40
0
12
L1 = MURATA LQH32CN220K23
5mA LOAD
1mA LOAD
V
CC
= 3.6V
EFFICIENCY vs. LOAD CURRENT
WITH 22
µH INDUCTOR
MAX8570/71/73/74/75 toc08
LOAD CURRENT (mA)
EFFICIENCY (%)
10
1
50
60
70
80
90
100
40
0.1
100
MAX8574, TOKO A914BYW-220M
MAX8571, MURATA LQH32CN220K23
MAX8570, MURATA LQH32CN220K23
EFFICIENCY vs. LOAD CURRENT
WITH 47
µH INDUCTOR
MAX8570/71/73/74/75 toc09
LOAD CURRENT (mA)
EFFICIENCY (%)
10
1
50
60
70
80
90
100
40
0.1
100
MAX8570, L1 = MURATA LQH32CN470K23
MAX8571, L1 = TOKO A914BYW-470M
PEAK INDUCTOR CURRENT LIMIT
vs. SUPPLY VOLTAGE
MAX8570/71/73/74/75 toc10
SUPPLY VOLTAGE (V)
CURRENT LIMIT (mA)
5.1
4.7
4.3
3.9
3.5
3.1
100
200
300
400
500
600
700
0
2.7
5.5
MAX8574
MAX8571
MAX8570
SUPPLY CURRENT vs. LOAD CURRENT
MAX8570/71/73/74/75 toc11
LOAD CURRENT (mA)
SUPPLY CURRENT (mA)
10
5
20
40
60
80
100
120
0
0
15
L1 = MURATA LQH32CN220K23
NO-LOAD CURRENT vs. SUPPLY VOLTAGE
MAX8570/71/73/74/75 toc12
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
µ
A)
5
4
1
2
3
10
20
30
40
50
60
70
80
0
0
6
R1 = 3.9M
Ω
R2 = 287k
Ω
R1 = 7.87M
Ω
R2 = 576k
Ω
MAX8573,
FIGURE 3
L1 = MURATA
LQH32CN220K23
NO SWITCHING
LINE TRANSIENT 3V TO 5.5V (MAX8571)
MAX8570/71/73/74/75 toc13
100
µs/div
V
CC
V
OUT
200mV/div
(AC-COUPLED)
2V/div
0
3.6k
Ω LOAD, R1 = 3.9MΩ, R2 = 287kΩ
LINE TRANSIENT 3V TO 5.5V
(FIGURE 3, MAX8573)
MAX8570/71/73/74/75 toc14
100
µs/div
V
CC
V
OUT
200mV/div
(AC-COUPLED)
2V/div
0
3k
Ω LOAD
Typical Operating Characteristics (continued)
(MAX8571, V
CC
= 3.6V, V
OUT
= 18V, Circuit of Figure 2, T
A
= +25
°C, unless otherwise noted.)