STOD1812 Datasheet, PDF (1/19 Pages) STMicroelectronics – Power supply for PMOLED display panel

STOD1812
Power supply for PMOLED display panel
Features
■ Synchronous step-up converter
■ Input voltage range from 2.5 V to 5.5 V
■ Maximum output current 120 mA
■ Efficiency: 75 % at I_O = 10 mA - 30 mA; 85 % at
I_O = 30 mA - 120 mA
■ Switching at 1.2 MHz in typical application
conditions
■ Enable pin for shutdown mode
■ True load disconnect
■ Soft-start to limit inrush current
■ UVLO protection
■ Adjustable output voltage up to 20 V
■ Low quiescent current: < 1 µA in shutdown
mode
■ Over-temperature protection
■ Package: DFN10L 3x3 mm, 0.8 mm
■ Operating junction temperature range:
-40 °C to 125 °C
Applications
■ Passive matrix OLED power supplies
■ Mobile phones
■ PDAs
■ Camcorders
■ Digital still cameras
DFN10L (3x3 mm)
Description
STOD1812 is a step-up converter designed to
power passive matrix OLED (PMOLED) displays,
providing the pre-charge and biasing voltage of
the column matrix driver. STOD1812 uses a
pulsed frequency modulation (PFM) control mode
technique. The high switching frequency makes it
possible to reduce the value and size of the
external components. This device is particularly
suitable for battery-operated applications, where
overall system efficiency is the major concern.
Synchronous rectification has been integrated in
the device in order to eliminate the external
Schottky diode. An internal compensation net is
also integrated, enabling the STOD1812 to
provide excellent load transient performance in
addition to good load regulation.
The output voltage is set using two external
resistors. Over-temperature protection and under-
voltage lockout (UVLO) functions are integrated in
the device. An additional switch implements a true
load disconnection feature which stops the
currrent flowing from the input when the device is
in shutdown mode. The EN pin turns off the
device, reducing the quiescent current to 0.1 µA.
Table 1.
Device summary
Order code
STOD1812PUR
Package
DFN10L (3x3 mm)
Packaging
3000 parts per reel
March 2008
Rev 1
1/19
www.st.com
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