EUP2618 Datasheet, PDF (1/13 Pages) Eutech Microelectronics Inc – Triple Adjustable Output TFT-LCD DC-DC Converters

Preliminary
EUP2618
Triple Adjustable Output
TFT-LCD DC-DC Converters
DESCRIPTION
The EUP2618 triple-output DC-DC converter provides the
regulated voltages required by active-matrix, thin-film
transistor (TFT) liquid-crystal displays (LCDs). One
high-power DC-DC converter and two low-power charge
pumps convert the 3.3V to 5V input supply voltage into
three independent output voltages.
The primary 1.2MHz DC-DC converter generates a boosted
output voltage (V_MAIN) up to 18V using ultra-small
inductors and ceramic capacitors. The low-power control
circuitry and the low on-resistance (0.2Ω) of the integrated
power MOSFET allows efficiency up to 92%.
The dual charge pumps independently regulate one positive
output (V_POS) and one negative output (V_NEG). These
low-power outputs use external diode and capacitor stages
to regulate output voltages up to 40V and down to -40V.
For EUP2618, the supply sequence is V_MAIN first, V_NEG
next, and finally V_POS. The EUP2618 soft-starts each
supply as soon as the previous supply finishes.
The EUP2618 are available in the ultra-thin TSSOP-16
package.
Typical Application Circuit
FEATURES
z 1.2MHz Current-Mode PWM Boost Regulator
Up to 18V Main High-Power Output
2.1A, 0.2Ω Power MOSFET
92% High Efficiency
z Dual Adjustable Charge-Pump Outputs
Up to 40V Positive Output
Down to -40V Negative Output
z Internal Power-up Sequencing
z 2.5V to 5.5V Input Range
z 0.1µA Shutdown Current
z 0.7mA Quiescent Current
z Internal Soft-Start
z Power-Ready Output
z Ultra-Small External Components
z Thin TSSOP-16 Package
z RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
z TFT Active-Matrix LCD Displays
z Passive-Matrix LCD Displays
z PDAs
z Digital Still Cameras
z Camcorders
DS2618 Ver0.1 Nov. 2007
Figure 1.
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