MAX8570_10 Datasheet, PDF (1/11 Pages) Maxim Integrated Products – High-Efficiency LCD Boost with True Shutdown

19-3329; Rev 3; 3/10
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
Features
o 15V or Adjustable Output Voltage Up to 28V
o Safety Features Protect Against Output Faults
o 20mA at 20V from a Single Li+ Battery
o True Shutdown
o 87% Efficiency
o Up to 800kHz Switching Frequency
o Small, 6-Pin SOT23 and µDFN (MAX8570 Only)
Packages
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
TOP
MARK
MAX8570ELT+T -40°C to +85°C 6L µDFN
MAX8570EUT+T -40°C to +85°C 6 SOT23
MAX8571EUT+T -40°C to +85°C 6 SOT23
MAX8572EUT+T -40°C to +85°C 6 SOT23
MAX8573EUT+T -40°C to +85°C 6 SOT23
MAX8574EUT+T -40°C to +85°C 6 SOT23
MAX8575EUT+T -40°C to +85°C 6 SOT23
+Denotes a lead(Pb)-free RoHS-compliant package.
T = Tape and reel.
ACW
ABTJ
ABTK
ABTL
ABTM
ABTN
ABTO
Selector Guide
PART
MAX8570
MAX8571
MAX8572
MAX8573
MAX8574
MAX8575
CURRENT LIMIT
110mA
250mA
110mA
250mA
500mA
500mA
OUTPUT VOLTAGE
Adjustable
Adjustable
15V
15V
Adjustable
15V
Typical Operating Circuit
TOP VIEW
+
FB 1
GND 2
SHDN 3
MAX8570
MAX8571
MAX8574
6 V_CC
5 SW
4 LX
V_CC = 2.7V TO 5.5V
SW
LX
MAX8572
MAX8573
V_CC MAX8575 OUT
V_OUT = V_CC TO 28V
SOT23
Pin Configurations continued at end of data sheet.
True Shutdown is a trademark of Maxim Integrated Products, Inc.
ON
SHDN
GND
OFF
________________________________________________________________ Maxim Integrated Products 1
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