Using the latest CMOS design technology and available in very small packages, the AME5130/31/38 and AME5140/42 products are dedicated for the drive of white LEDs but also applicable in portable equipment.
There are alternative technologies used to give the
customer the opportunity of the best choice stepup
DC-to-DC converters for constant current.
The AME5142 is a fully integrated white LED boost
converter that drives up to six white LEDs in series
to simplify and miniaturize color LCD display
illumination used in digital cameras, cell phones
and PDAs.
A series configured array of white LEDs is currently
considered the most effective backlighting solution
for the design of color LCD displays because this
architecture achieves ideal current matching of the
LEDs to provide uniform lighting.
The device operates as
a DC-to-DC boost converter
that regulates
the current through the
LED string. Dimming is
accomplished by applying
a pulse width modulated
signal (PWM)
to change the average
output current.
The AME5140 is a switching regulator using the
current mode boost converter technology with a
fixed 1.6 MHz switching frequency. Highest power
density is achieved with the use of a very small
inductor and capacitor and is possible due to the
minimal power loss of the internal 1.6A switch.
The AME5138 is a fixed off-time step-up DC-to-DC
converter ideal for LCD panels requiring low current
and high efficiency. The low 400ns off-time
allows the use of tiny external components.
The AME5130 fixed off-time step-up DC-to-DC
converter can drive up to 8 white LEDs from a
single Li-Ion battery.
The AME5131 high frequency boost converter is
dedicated for LCD bias supply. It can also be used
in white LED applications for backlighting.
Standard 3.3V / 5V to 12V power conversions are
applications benefiting from the low voltage output
ripple. A very low quiescent current and optimized
control scheme allow operation with high efficiency
and long battery life time.
FEATURES
1.8 to 5.5V input range
Very small packages (SOT25-DFN)
Wide temperature range -40° to 85°C
APPLICATIONS
White LED backlighting
Portable applications
White LED current source
LCD bias power
Standard 3.3V/5V to 12V conversions
Featured Products
Part Number
Description
Data Sheet
App. Notes
AME5130AEEVADJZ
Micropower Step-up DC-to-DC Converter
AME5131AEEVADJZ
Low Power DC-to-DC Boost Converter
AME5138AEEVADJZ
Micropower Step-up DC-to-DC Converter
AME5140AEEVADJY
1.6MHz Boost Converter with 30V Internal FET Switch
AME5140AEEVADJZ
1.6MHz Boost Converter with 30V Internal FET Switch
AME5140AEVAADJZ-3
1.6MHz Boost Converter with 30V Internal FET Switch
AME5140BEQAADJZ
1.6MHz Boost Converter with 30V Internal FET Switch
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