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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1605 Datasheet

30V Internal Switch LCD Bias Supply

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19-1666; Rev 1; 10/03
30V Internal Switch LCD Bias Supply
General Description
The MAX1605 boost converter contains a 0.5A internal
switch in a tiny 6-pin SOT23 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 30V at the output.
The MAX1605 uses a unique control scheme providing
the highest efficiency over a wide range of load condi-
tions. An internal 0.5A MOSFET reduces external com-
ponent 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 com-
ponent size in low-current applications.
Additional features include a low quiescent supply cur-
rent and a shutdown mode to save power. The
MAX1605 is ideal for small LCD panels with low current
requirements, but can also be used in other applica-
tions. A MAX1605EVKIT evaluation kit (EV kit) is avail-
able to help speed up design time.
Features
o Adjustable Output Voltage up to 30V
o 20mA at 20V from a Single Li+ Battery
o 88% Efficiency
o Up to 500kHz Switching Frequency
o Selectable Inductor Current Limit
(125mA, 250mA, or 500mA)
o 18µA Operating Supply Current
o 0.1µA Shutdown Current
o Avaiable in Two Small Packages
6-Pin TDFN
6-Pin SOT23
Applications
LCD Bias Generators
Cellular/Cordless Phones
Palmtop Computers
Personal Digital Assistants (PDAs)
Organizers
Handy Terminals
Ordering Information
PART
TEMP
RANGE
MAX1605EUT-T -40°C to +85°C
MAX1605ETT-T -40°C to +85°C
PIN-
PACKAGE
6 SOT23-6
6 TDFN
SOT
MARK
AAHP
ABW
Typical Operating Circuit
VIN = 0.8V TO VOUT
L1
10µH
TOP VIEW
Pin Configuration
VCC = 2.4V TO 5.5V VCC
LX
ON
OFF
MAX1605
LIM FB
SHDN
GND
VOUT = VIN TO 30V
SHDN 1
6 FB SHDN 1
6 FB
VCC 2 MAX1605 5 LIM VCC 2
GND 3
4 LX GND 3
MAX1605
5 LIM
4 LX
SOT23
TDFN
3mm 3mm
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1605 Datasheet

30V Internal Switch LCD Bias Supply

No Preview Available !

30V Internal Switch LCD Bias Supply
ABSOLUTE MAXIMUM RATINGS
VCC, FB, LIM, SHDN to GND....................................-0.3V to +6V
LX to GND ..............................................................-0.3V to +32V
Continuous Power Dissipation (TA = +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C) ...........696mW
6-Pin TDFN (derate 24.4mW/°C above +70°C) .........1951mW
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 = SHDN = 3.3V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Supply Voltage
Inductor Input Voltage Range
VCC Undervoltage Lockout
Quiescent Supply Current
Shutdown Supply Current
VCC Line Regulation
VIN Line Regulation
Load Regulation
Efficiency
Feedback Set Point
Feedback Input Bias Current
LX
LX Voltage Range
LX Switch Current Limit
LX On-Resistance
LX Leakage Current
Maximum LX On-Time
Minimum LX Off-Time
SYMBOL
VCC
VIN
VUVLO
ICC
VLNR
VLNR
VLDR
VFB
IFB
(Note 2)
CONDITIONS
(Note 2)
VCC falling, 50mV typical hysteresis
VFB = 1.3V
SHDN = GND
VOUT = 18V, ILOAD = 1mA, VIN = 5V,
VCC = VLIM = 2.4V to 5.5V
VOUT = 18V, ILOAD = 1mA,
VCC = VLIM = 5V, VIN = 2.4V to 12V
VOUT = 18V, VCC = VIN = VLIM = 5V,
ILOAD = 0mA to 20mA
L1 = 100µH, VIN = 3.6V, ILOAD = 10mA
VFB = 1.3V
VLX
ILX(MAX)
RLX
tON
tOFF
LIM = VCC
LIM = floating
LIM = GND
VCC = 5V, ILX = 100mA
VCC = 3.3V, ILX = 100mA
VLX = 30.5V
VFB > 1.1V
VFB < 0.8V (soft-start)
MIN TYP
2.4
0.8
2.0 2.2
18
0.1
0.1
0.15
1.225
0.1
88
1.25
5
0.40
0.20
0.10
0.50
0.25
0.125
0.8
1
10 13
0.8 1.0
3.9 5.0
MAX
5.5
VOUT
2.37
35
1
1.275
100
30.5
0.56
0.285
0.15
2
2
16
1.2
6.0
UNITS
V
V
V
µA
µA
%/V
%/V
%/mA
%
V
nA
V
A
µA
µs
µs
2 _______________________________________________________________________________________


Part Number MAX1605
Description 30V Internal Switch LCD Bias Supply
Maker Maxim
Total Page 12 Pages
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