Rainbow Electronics MAX8575 - Manual

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 Package
MAX8570–MAX8575
High-Efficiency LCD Boost
with True Shutdown
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3329; Rev 0; 7/04
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.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE
PIN-
PACKAGE TOP
MARK
MAX8570EUT-T* -40 °C to +85°C 6 SOT23-6 ABTJ
MAX8571EUT-T* -40 °C to +85°C 6 SOT23-6 ABTK
MAX8572EUT-T -40 °C to +85°C 6 SOT23-6 ABTL
MAX8573EUT-T -40 °C to +85°C 6 SOT23-6 ABTM
MAX8574EUT-T* -40 °C to +85°C 6 SOT23-6 ABTN
MAX8575EUT-T -40 °C to +85°C 6 SOT23-6 ABTO
GND
LX
1 6 V CC
5 SW
FB
MAX8570
MAX8571
MAX8574
SOT23-6
TOP VIEW
2
3 4 SHDN
GND
LX
1 6 V CC
5 SW
OUT
MAX8572
MAX8573
MAX8575
SOT23-6
2
3 4 SHDN
Pin Configurations
PART CURRENT LIMIT OUTPUT VOLTAGE
MAX8570EUT 110mA Adjustable
MAX8571EUT 250mA Adjustable
MAX8572EUT 110mA 15V
MAX8573EUT 250mA 15V
MAX8574EUT 500mA Adjustable
MAX8575EUT 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
*Future products—contact factory for availability.