STOD03B Datasheet, PDF (1/22 Pages) STMicroelectronics – Step-up with LDO and inverter converters

STOD03B
150 mA dual DC-DC converter with LDO
for powering AMOLED displays
Features
■ Step-up with LDO and inverter converters
■ Operating input voltage range from 2.3 V to
4.8 V
■ Synchronous rectification for both DC-DC
converters
■ Minimum 150 mA output current
■ LDO post regulator for 4.6 V fixed positive
output to provide line and load transient
response with minimum output voltage ripple
■ Programmable negative voltage by S_WIRE from
- 2.4 V to -5.4 V at 100 mV steps
■ Typical efficiency: 82%
■ Pulse skipping mode in light load condition
■ 1.5 MHz PWM mode control switching
frequency
■ Enable pin for shutdown mode
■ Low quiescent current in shutdown mode
■ Soft-start with inrush current protection
■ Overtemperature protection
■ Temperature range: -40 °C to 85 °C
■ True-shutdown mode
■ Package DFN (3 x 3) 12 leads 0.6 mm height
Applications
■ Active matrix AMOLED power supply in
portable devices
■ Cellular phones
■ Camcorders and digital still cameras
■ Multimedia players
DFN12L (3 x 3 mm)
Description
The STOD03B is a dual DC-DC converter for
AMOLED display panels. It integrates a step-up
and an inverting DC-DC converter making it
particularly suitable for battery operated products,
in which the major concern is the overall system
efficiency. It works in pulse skipping mode during
low load conditions and PWM-MODE at 1.5 MHz
frequency for medium/high load conditions. The
high frequency allows the value and size of
external components to be reduced. The 4.6 V
output is provided by an LDO in cascade with the
step-up converter. This allows a noise and ripple
free positive output for the AMOLED panel to
provide stable picture quality. The Enable pin
allows the device to be turned off, therefore
reducing the current consumption to less than
1 µA. The negative output voltage can be
programmed by an MCU through a dedicated pin
which implements single-wire protocol. Soft-start
with controlled inrush current limit and thermal
shutdown are integrated functions of the device.
Table 1. Device summary
Order code
Positive voltage
Negative voltage
Package
Packaging
STOD03BTPUR
4.6V
- 2.4V to - 5.4V
DFN12L (3 x 3mm) 3000 parts per reel
December 2011
Doc ID 022613 Rev 1
1/22
www.st.com
22