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MAX8571EUT+T

P1-P3P4-P6P7-P9P10-P11
General Description
The MAX8570 family of LCD step-up converters uses
an internal n-channel switch and an internal p-channel
output isolation switch. These converters operate from
a 2.7V to 5.5V supply voltage and deliver up to 28V at
the output.
A unique control scheme provides the highest efficien-
cy over a wide range of load conditions. The internal
MOSFET switch reduces external component count and
a high switching frequency (up to 800kHz) allows for
tiny surface-mount components. Three current-limit
options are available. The MAX8570 and MAX8572 use
a 110mA current limit to reduce ripple and component
size in low-current applications. For high-power require-
ments, the MAX8574 and MAX8575 use a 500mA cur-
rent limit and supply up to 20mA at 20V. The MAX8571
and MAX8573 use a 250mA current limit for a compro-
mise between ripple and power. Built-in safety features
protect the internal switch and down-stream compo-
nents from fault conditions.
Additional features include a low quiescent current and
a True Shutdown™ mode to save power. The MAX8570/
MAX8571/MAX8574 allow the user to set the output
voltage between 3V and 28V, and the MAX8572/
MAX8573/MAX8575 have a preset 15V output. These
step-up converters are ideal for small LCD panels with
low current requirements, but can also be used in other
applications. The MAX8571 evaluation kit is available to
help reduce design time.
Applications
LCD Bias Generators
Polymer LEDs (OLED)
Cellular or Cordless Phones
Palmtop Computers
Personal Digital Assistants (PDAs)
Organizers
Handy Terminals
Features
♦ 15V or Adjustable Output Voltage Up to 28V
♦ Safety Features Protect Against Output Faults
♦ 20mA at 20V from a Single Li+ Battery
♦ True Shutdown
♦ 87% Efficiency
♦ Up to 800kHz Switching Frequency
♦ Small, 6-Pin SOT23 and µDFN (MAX8570 Only)
Packages
MAX8570–MAX8575
High-Efficiency LCD Boost
with True Shutdown
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-3329; Rev 3; 3/10
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com
EVALUATION KIT
AVAILABLE
PART TEMP RANGE
PIN-
PACKAGE
TOP
MARK
MAX8570ELT+T -40°C to +85°C 6L μDFN ACW
MAX8570EUT+T -40°C to +85°C 6 SOT23 ABTJ
MAX8571EUT+T -40°C to +85°C 6 SOT23 ABTK
MAX8572EUT+T -40°C to +85°C 6 SOT23 ABTL
MAX8573EUT+T -40°C to +85°C 6 SOT23 ABTM
MAX8574EUT+T -40°C to +85°C 6 SOT23 ABTN
MAX8575EUT+T -40°C to +85°C 6 SOT23 ABTO
GND
LX
1
+
6V
CC
5SW
FB
MAX8570
MAX8571
MAX8574
SOT23
TOP VIEW
2
34SHDN
Pin Configurations
PART
CURRENT LIMIT
OUTPUT VOLTAGE
MAX8570 110mA Adjustable
MAX8571 250mA Adjustable
MAX8572 110mA 15V
MAX8573 250mA 15V
MAX8574 500mA Adjustable
MAX8575 500mA 15V
Selector Guide
True Shutdown is a trademark of Maxim Integrated Products, Inc.
MAX8572
MAX8573
MAX8575
SW
V
CC
LX
OUT
GND
ON
OFF
V
CC
= 2.7V TO 5.5V
V
OUT
= V
CC
TO 28V
SHDN
Typical Operating Circuit
+
Denotes a lead(Pb)-free RoHS-compliant package.
T = Tape and reel.
Pin Configurations continued at end of data sheet.
MAX8570–MAX8575
High-Efficiency LCD Boost
with True Shutdown
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= V
SHDN
= 3.6V, SW open, 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)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V
CC
, SHDN to GND..................................................-0.3V to +6V
SW to GND .................................................-0.3V to (V
CC
+ 0.3V)
FB to GND (MAX8570/MAX8571/
MAX8574)...............................................-0.3V to (V
CC
+ 0.3V)
OUT to GND (MAX8572/MAX8573/MAX8575) .......-0.3V to +30V
LX to GND ..............................................................-0.3V to +30V
I
LX
, I
CC
..............................................................................600mA
Continuous Power Dissipation (T
A
= +70°C)
μDFN (derate 4.5mW/°C above +70°C)....................357.8mW
SOT23-6 (derate 8.7mW/°C above +70°C)...............695.7mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Input Voltage Range 2.70 5.50 V
V
CC
Undervoltage Lockout V
CC
rising, 50mV typical hysteresis 2.33 2.5 2.65 V
V
CC
Supply Current 25 35 μA
T
A
= +25°C 0.05 1
V
CC
Shutdown Current SHDN = GND, V
CC
= 5.5V
T
A
= -40°C to +85°C 0.05
μA
Line Regulation
Circuit of Figure 3, V
OUT
= 15V, I
LOAD
= 5mA,
V
CC
= 2.7V to 5.5V
0.1 %/V
Load Regulation Circuit of Figure 3, V
OUT
= 15V, I
LOAD
= 0 to 5mA 0.1 %/mA
T
A
= 0°C to +85°C 1.216 1.226 1.236
FB Regulation Voltage
T
A
= -40°C to +85°C 1.2137 1.2383
V
FB Input Bias Current -50 -4 +50 nA
T
A
= 0°C to +85°C 14.85 15 15.15
OUT Regulation Voltage
T
A
= -40°C to +85°C 14.813 15.187
V
OUT Input Bias Current V
OUT
= 15V 2.4 4.4 μA
LX Voltage Range 28 V
MAX8571/MAX8573 0.217 0.241 0.267
MAX8570/MAX8572 0.088 0.101 0.108LX Switch Current Limit (Note 2)
MAX8574/MAX8575 0.425 0.484 0.540
A
MAX8571/MAX8573/MAX8574/MAX8575, I
LX
= 100mA 0.9 1.5
LX On-Resistance
MAX8570/MAX8572, I
LX
= 50mA 1.5 2.4
Ω
T
A
= +25°C 0.01 2
LX Leakage Current V
LX
= 28V
T
A
= -40°C to +85°C 0.05
μA
Maximum LX On-Time 81114μs
V
FB
> 1V or V
OUT
> 12.2V 0.8 1 1.2
Minimum LX Off-Time
V
FB
= 0.25V or V
OUT
= 3.4V 4.0 5 6.0
μs
Current-Limit Propagation Delay 55 ns
SHDN Low Level (V
IL
) 2.7V ≤ V
CC
≤ 5.5V 0.7 V
4.2V ≤ V
CC
≤ 5.5V 1.5
SHDN High Level (V
IH
)
2.7V ≤ V
CC
< 4.2V 1.4
V
SHDN Leakage Current -1 +1 μA
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
47
μ
H, 1mA LOAD
47
μ
H, 5mA LOAD
L1 = MURATA LQH32CN220K23
22μH, 5mA LOAD
22
μ
H, 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 = 3.9M
Ω
, R2 = 287k
Ω
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 = 1.1M
Ω
, R2 = 75k
Ω
, 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 = 1.1M
Ω
, R2 = 75k
Ω
, 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 open, 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)
PARAMETER CONDITIONS MIN TYP MAX UNITS
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 1
SW PMOS Leakage Current 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
P1-P3P4-P6P7-P9P10-P11

MAX8571EUT+T

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