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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1606 Datasheet

28V Internal Switch LCD Bias Supply with True Shutdown

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MAX1606 pdf
19-1744; Rev 0; 7/00
28V Internal Switch LCD Bias Supply
with True Shutdown
General Description
The MAX1606 is a step-up DC-DC converter that con-
tains a 0.5A internal power switch and a 0.5A output
isolation switch in an 8-pin µMAX package. The IC
operates from a 2.4V to 5.5V supply voltage but can
boost battery voltages as low as 0.8V up to 28V.
The MAX1606 uses a unique control scheme that pro-
vides high efficiency over a wide range of load condi-
tions. An internal 0.5A MOSFET reduces external
component count, and a high switching frequency (up
to 500kHz) allows for tiny surface-mount components.
The current limit can be set to 500mA, 250mA, or
125mA, allowing the user to reduce the output ripple
and component size in low-current applications.
Additional features include a low quiescent supply cur-
rent and a true shutdown mode that saves power by
disconnecting the output from the input. The MAX1606
is ideal for small LCD panels with low current require-
ments but can also be used in other applications. A
MAX1606 evaluation kit is available to help speed up
design time.
________________________Applications
LCD Bias Generators
Cellular or Cordless Phones
Palmtop Computers
Personal Digital Assistants (PDAs)
Organizers
Handy Terminals
Features
o Adjustable Output Voltage up to 28V
o 20mA at 20V from a Single Li+ Battery
o True Shutdown (Output Disconnected from Input)
o Output Short-Circuit Protection
o 88% Efficiency
o Up to 500kHz Switching Frequency
o Selectable Inductor Current Limit
(125mA, 250mA, or 500mA)
o 0.1µA Shutdown Current
o 8-Pin µMAX Package
PART
MAX1606EUA
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
8 µMAX
Typical Operating Circuit
Pin Configuration
VIN = 0.8V TO 5.5V
VCC = 2.4V TO 5.5V
ON
OFF
SW
BATT LX
MAX1606
VCC FB
LIM
SHDN
GND
VOUT = VIN TO 28V
TOP VIEW
BATT 1
FB 2
VCC 3
GND 4
MAX1606
µMAX
8 SW
7 SHDN
6 LIM
5 LX
________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1606 Datasheet

28V Internal Switch LCD Bias Supply with True Shutdown

No Preview Available !

MAX1606 pdf
28V Internal Switch LCD Bias Supply
with True Shutdown
ABSOLUTE MAXIMUM RATINGS
VCC, FB, BATT, SW to GND .....................................-0.3V to +6V
BATT to SW ..............................................................-0.3V to +6V
SHDN, LIM to GND.....................................-0.3V to (VCC + 0.3V)
LX to GND ..............................................................-0.3V to +30V
Current into LX or BATT..............................................600mARMS
Current out of SW .......................................................600mARMS
Output Short-Circuit Duration ........................................Indefinite
Continuous Power Dissipation (TA = +70°C)
8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW
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
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.
ELECTRICAL CHARACTERISTICS
(VCC = 3.3V, VCC = BATT = SHDN, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
VCC Supply Voltage
BATT Input Voltage Range
VCC Undervoltage Lockout
VCC Quiescent Supply Current
VCC Shutdown Supply Current
BATT Input Supply Current
BATT Shutdown Supply Current
SYMBOL
VCC
VBATT
VUVLO
ICC
IBATT
CONDITIONS
(Note 1)
(Note 1)
VCC falling, 30mV typical hysteresis
VFB = 1.3V
SHDN = GND
VFB = 1.3V
SHDN = GND
MIN TYP MAX
2.4 5.5
0.8 5.5
2.0 2.2 2.37
160 320
0.1 1
20 40
0.1 1
VCC Line Regulation
VLNR
VOUT = 18V, ILOAD = 1mA, VBATT = 3.6V,
VCC = VLIM = 2.4V to 5.5V
0.1
BATT Line Regulation
VLNR
VOUT = 18V, ILOAD = 1mA,
VCC = VLIM = 3.3V, VBATT = 0.8V to 5.5V
0.05
Load Regulation
VLDR
Efficiency
Feedback Set Point
VFB
Feedback Input Bias Current
IFB
INDUCTOR CONNECTIONS (LX, SW)
LX Voltage Range
VLX
LX Switch Current Limit
ILX(MAX)
LX On-Resistance
LX Leakage Current
Maximum LX On-Time
Minimum LX Off-Time
SW Leakage Current
RLX
tON
tOFF
VOUT = 18V, VCC = VBATT = VLIM = 3.3V,
ILOAD = 0mA to 20mA
L1 = 100µH, VBATT = 3.6V, ILOAD = 10mA
VFB = 1.3V
LIM = VCC
LIM = floating
LIM = GND
VCC = 5V, ILX = 100mA
VCC = 3.3V, ILX = 100mA
VLX = 28V
VFB > 1.1V
VFB < 0.8V (soft-start)
SW = GND, VBATT = 5.5V
1.225
0.05
88
1.25
5
1.275
100
28
0.40 0.50 0.56
0.20 0.25 0.285
0.10 0.125 0.15
0.8
12
2
10 13 16
0.8 1.0 1.2
3.9 5.0 6.0
1
UNITS
V
V
V
µA
µA
µA
µA
%/V
%/V
%/mA
%
V
nA
V
A
µA
µs
µs
µA
2 _______________________________________________________________________________________


Part Number MAX1606
Description 28V Internal Switch LCD Bias Supply with True Shutdown
Maker Maxim
Total Page 10 Pages
PDF Download
MAX1606 pdf
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