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PDF MAX8575EUT Data sheet ( Hoja de datos )
| Número de pieza | MAX8575EUT | |
| Descripción | High-Efficiency LCD Boost with True Shutdown | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-3329; Rev 1; 10/04
EVAALVUAAILTAIOBNLEKIT
High-Efficiency LCD Boost
with True Shutdown
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
Pin Configurations
TOP VIEW
FB 1
GND 2
SHDN 3
MAX8570
MAX8571
MAX8574
6 VCC
5 SW
4 LX
OUT 1
GND 2
SHDN 3
MAX8572
MAX8573
MAX8575
6 VCC
5 SW
4 LX
SOT23-6
SOT23-6
True Shutdown is a trademark of Maxim Integrated Products,
Inc.
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 Package
PART
MAX8570EUT-T
MAX8571EUT-T
MAX8572EUT-T
MAX8573EUT-T
MAX8574EUT-T
MAX8575EUT-T
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
TOP
MARK
ABTJ
ABTK
ABTL
ABTM
ABTN
ABTO
PART
MAX8570EUT
MAX8571EUT
MAX8572EUT
MAX8573EUT
MAX8574EUT
MAX8575EUT
Selector Guide
CURRENT LIMIT
110mA
250mA
110mA
250mA
500mA
500mA
OUTPUT VOLTAGE
Adjustable
Adjustable
15V
15V
Adjustable
15V
Typical Operating Circuit
SW LX
VCC = 2.7V TO 5.5V
MAX8572
MAX8573
VCC MAX8575 OUT
VOUT = VCC TO 28V
ON
SHDN
OFF
GND
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
High-Efficiency LCD Boost
with True Shutdown
Typical Operating Characteristics (continued)
(MAX8571, VCC = 3.6V, VOUT = 18V, Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
LOAD TRANSIENT
MAX8570/71/73/74/75 toc15
STARTUP AND SHUTDOWN WAVEFORMS
MAX8570/71/73/74/75 toc16
VOUT
100mV/div
VSHDN
BOOST SOFT-START
5V/div
(AC-COUPLED)
SW TURN-ON
VOUT
10V/div
0
5mA/div
IOUT 0
100µs/div
ILX
1.8Ω LOAD
400µs/div
200mA/div
0
Pin Description
PIN NAME
FUNCTION
FB
(MAX8570/ Feedback for setting the output voltage. Connect FB to the center of a resistor voltage-divider from the
MAX8571/ output to GND to set positive output voltages.
MAX8574)
1
OUT
(MAX8572/ Output. The output voltage is preset to 15V. Connect a 1µF ceramic capacitor from OUT to GND. In
MAX8573/ shutdown, OUT is pulled to GND by an internal 7.5MΩ resistor.
MAX8575)
2 GND Ground
3
SHDN
Shutdown Input. A logic low at SHDN places the part in low-power shutdown mode. Pull SHDN high or
connect to VCC for normal operation.
4 LX Inductor Switching Connection
Isolation Switch Output. Internally connected to the drain of a p-channel MOSFET used to isolate the
5 SW 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.
6
VCC
Input Voltage Supply. Connect a 2.7V to 5.5V input supply to VCC. Connect a 1µF ceramic capacitor from
VCC to GND.
_______________________________________________________________________________________ 5
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| PDF Descargar | [ Datasheet MAX8575EUT.PDF ] | |
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