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Strain Gauges, Load Ce ..
MAX1605ETT-T-MAX1605EUT-T
30V Internal Switch LCD Bias Supply
30V Internal Switch LCDBias Supply
General DescriptionThe 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.
ApplicationsLCD Bias Generators
Cellular/Cordless Phones
Palmtop Computers
Personal Digital Assistants (PDAs)
Organizers
Handy Terminals
FeaturesAdjustable Output Voltage up to 30V20mA at 20V from a Single Li+ Battery88% EfficiencyUp to 500kHz Switching FrequencySelectable Inductor Current Limit
(125mA, 250mA, or 500mA)18µA Operating Supply Current0.1µA Shutdown CurrentAvaiable in Two Small Packages
6-Pin TDFN
6-Pin SOT23
MAX1605
Pin ConfigurationTypical Operating Circuit
Ordering Information
MAX1605
30V Internal Switch LCDBias Supply
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICSStresses 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.
VCC, FB, LIM, SHDNto 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
MAX1605
30V Internal Switch LCDBias Supply
ELECTRICAL CHARACTERISTICS
ELECTRICAL CHARACTERISTICS (continued)
MAX1605
30V Internal Switch LCDBias SupplyMAX1605 toc04
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
EFFICIENCY vs. SUPPLY VOLTAGE
(L1 = 10µH)3912
EFFICIENCY vs. INPUT VOLTAGE
(L1 = 10µH)MAX1605 toc05
INPUT VOLTAGE (V)
EFFICIENCY (%)510152025
EFFICIENCY vs. LOAD CURRENT
(L1 = 10µH)MAX1605 toc06
LOAD CURRENT (mA)
EFFICIENCY (%)
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
MAX1605 toc01
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX1605 toc02
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX1605 toc03
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
Typical Operating Characteristics(VCC= 3.3V, VIN= 3.6V, L1 = 10µH, SHDN= LIM = VCC, VOUT(NOM) = 18V (Figure 3), TA= +25°C, unless otherwise noted.)
Note 1:All devices are 100% tested at TA= +25°C. All limits over the temperature range are guaranteed by design.
Note 2:The MAX1605 requires a supply voltage between +2.4V and +5.5V; however, the input voltage used to power the inductor
can vary from +0.8V to VOUT.
ELECTRICAL CHARACTERISTICS (continued)
ypical Operating Characteristics (continued)(VCC= 3.3V, VIN= 3.6V, L1 = 10µH, SHDN= LIM = VCC, VOUT(NOM) = 18V (Figure 3), TA= +25°C, unless otherwise noted.)
MAX1605
30V Internal Switch LCDBias Supply
MAX1605
30V Internal Switch LCDBias Supply
Pin Description
Detailed DescriptionThe MAX1605 compact, step-up DC-DC converter oper-
ates from a +2.4V to +5.5V supply. Consuming only
18µA of supply current, the device includes an internal
switching MOSFET with 1Ωon-resistance and selectable
current limit (Figure 1). During startup, the MAX1605
extends the minimum off-time, limiting initial surge cur-
rent. The MAX1605 also features a shutdown mode.
Control SchemeThe MAX1605 features a minimum off-time, current-lim-
ited control scheme. The duty cycle is governed by a
pair of one-shots that set a minimum off-time and a
maximum on-time. The switching frequency can be up
to 500kHz and depends upon the load and input volt-
age. The peak current limit of the internal N-channel
MOSFET is pin selectable and may be set at 125mA,
250mA, or 500mA (Figure 2).
Figure 1. Functional Diagram
