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MAX8571EUT+T

P1-P3P4-P6P7-P9P10-P11
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 (%)
108642
50
60
70
80
90
100
40
012
L1 = MURATA LQH32CN220K23
5mA LOAD
1mA LOAD
V
CC
= 3.6V
EFFICIENCY vs. LOAD CURRENT
WITH 22μH INDUCTOR
MAX8570/71/73/74/75 toc08
LOAD CURRENT (mA)
EFFICIENCY (%)
101
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 47μH INDUCTOR
MAX8570/71/73/74/75 toc09
LOAD CURRENT (mA)
EFFICIENCY (%)
101
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)
5.14.74.33.93.53.1
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)
105
20
40
60
80
100
120
0
015
L1 = MURATA LQH32CN220K23
NO-LOAD CURRENT vs. SUPPLY VOLTAGE
MAX8570/71/73/74/75 toc12
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (μA)
541 2 3
10
20
30
40
50
60
70
80
0
06
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
100μs/div
V
CC
V
OUT
200mV/div
(AC-COUPLED)
2V/div
0
3.6kΩ LOAD, R1 = 3.9MΩ, R2 = 287kΩ
LINE TRANSIENT 3V TO 5.5V
(FIGURE 3, MAX8573)
MAX8570/71/73/74/75 toc14
100μs/div
V
CC
V
OUT
200mV/div
(AC-COUPLED)
2V/div
0
3kΩ LOAD
Typical Operating Characteristics (continued)
(MAX8571, V
CC
= 3.6V, V
OUT
= 18V, Circuit of Figure 2, T
A
= +25°C, unless otherwise noted.)
MAX8570–MAX8575
High-Efficiency LCD Boost
with True Shutdown
_______________________________________________________________________________________ 5
PIN
MAX8570
(µDFN)
MAX8570/
MAX8571/
MAX8574
(SOT23)
MAX8572/
MAX8573/
MAX8575
(SOT23)
NAME FUNCTION
31—FB
Feedback for Setting the Output Voltage. Connect FB to the center of a resistor
voltage-divider from the output to GND to set positive output voltages.
— — 1 OUT
Output. The output voltage is preset to 15V. Connect a 1µF ceramic capacitor
from OUT to GND. In shutdown, OUT is pulled to GND by an internal 7.5MΩ
resistor.
2 2 2 GND Ground
133SHDN
Shutdown Input. A logic-low at SHDN places the part in low-power shutdown
mode. Pull SHDN high or connect to V
CC
for normal operation.
6 4 4 LX Inductor Switching Connection
555SW
Isolation Switch Output. Internally connected to the drain of a p-channel
MOSFET used to isolate the output from the input during shutdown. Connect a
4.7µF ceramic capacitor from SW to GND. If True Shutdown is not required, SW
can be left open with the input supply connected directly to the inductor.
466V
CC
Input Voltage Supply. Connect a 2.7V to 5.5V input supply to V
CC
. Connect a
1µF ceramic capacitor from V
CC
to GND.
Pin Description
LOAD TRANSIENT
MAX8570/71/73/74/75 toc15
100µs/div
V
OUT
I
OUT
100mV/div
(AC-COUPLED)
5mA/div
0
Typical Operating Characteristics (continued)
(MAX8571, V
CC
= 3.6V, V
OUT
= 18V, Circuit of Figure 2, T
A
= +25°C, unless otherwise noted.)
MAX8570–MAX8575
High-Efficiency LCD Boost
with True Shutdown
6 _______________________________________________________________________________________
MAX8570–
MAX8575
EA
ILIM
THERMAL
SHUTDOWN
OUT
FB
(MAX8570/MAX8571/
MAX8574 ONLY)
GND
(MAX8572/MAX8573/
MAX8575 ONLY)
LX
SW
V
CC
1.226V
CONTROL
LOGIC
SHDN
Figure 1. Functional Diagram
MAX8570
MAX8571
MAX8574
SW
V
CC
LX
FB
GND
ON
OFF
V
CC
= 2.7V TO 5.5V
V
OUT
= V
BATT
TO 28V
R1
R2
C3
4.7
μ
F
L1
22
μ
H
C1
1
μ
F
SHDN
C2
1
μ
F
C4
10pF
V
BATT
= 0.8V TO 28V
D1
Figure 4. Using a Separate Input Supply for the Inductor
MAX8570
MAX8571
MAX8574
SW
V
CC
LX
FB
GND
ON
OFF
V
CC
= 2.7V TO 5.5V
+V
OUT
-V
OUT
R1
C3
4.7μF
L1
22μH
C1
1μF
SHDN
C2
1μF
C5
1μF
C4
10pF
C6
0.1μF
D1
D3
D2
R2
Figure 5. Negative Output Voltage for LCD Bias
MAX8570
MAX8571
MAX8574
SW
V
CC
LX
FB
GND
ON
OFF
V
CC
= 2.7V TO 5.5V
V
OUT
= V
CC
TO 28V
R1
R2
C3
4.7
μ
F
L1
22
μ
H
C1
1
μ
F
SHDN
C2
1
μ
F
C4
10pF
D1
Figure 2. Typical Application Circuit with Adjustable Output
Voltage
MAX8572
MAX8573
MAX8575
SW
V
CC
LX
OUT
GND
ON
OFF
V
CC
= 2.7V TO 5.5V
V
OUT
= 15V
C3
4.7
μ
F
L1
22
μ
H
C1
1
μ
F
SHDN
C2
1
μ
F
D1
Figure 3. Typical Application Circuit with 15V Preset Output
Voltage
P1-P3P4-P6P7-P9P10-P11

MAX8571EUT+T

Mfr. #:
Buy MAX8571EUT+T
Manufacturer:
Maxim Integrated
Description:
LCD Drivers High-Efficiency LCD Boost
Lifecycle:
New from this manufacturer.
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