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.
FEATURES
1.2MHz Current-Mode PWM Boost Regulator
Up to 18V Main High-Power Output
2.1A, 0.2Ω Power MOSFET
92% High Efficiency
Dual Adjustable Charge-Pump Outputs
Up to 40V Positive Output
Down to -40V Negative Output
Internal Power-up Sequencing
2.5V to 5.5V Input Range
0.1µA Shutdown Current
0.7mA Quiescent Current
Internal Soft-Start
Power-Ready Output
Ultra-Small External Components
Thin TSSOP-16 Package
RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
TFT Active-Matrix LCD Displays
Passive-Matrix LCD Displays
PDAs
Digital Still Cameras
Camcorders
Typical Application Circuit
Figure 1.
DS2618 Ver0.1
Nov. 2007
1
EUTECH [ EUTECH MICROELECTRONICS INC ]
