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STOD13ASTPUR
250 mA dual DC-DC converter for powering AMOLED display
January 2012 Doc ID 022733 Rev 1 1/25
STOD13AS250 mA dual DC-DC converter
for powering AMOLED displays
Features Step-up and inverter converters Operating input voltage range from 2.5 V to
4.5V Synchronous rectification for both DC-DC
converters Minimum 250 mA output current 4.6 V fixed positive output voltage Programmable negative voltage by SWIRE from
-2.4 V to -6.4 V at 100 mV steps Typical efficiency: 85% Pulse skipping mode in light load condition 1.5 MHz PWM mode control switching
frequency TDMA noise high immunity 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 Fast discharge outputs of the circuits after
shutdown Short-circuit protection Package DFN12L (3 x 3 mm) 0.6 mm height
Applications Active matrix AMOLED power supply in
portable devices Cellular phones Camcorders and digital still cameras Multimedia players
DescriptionThe STOD13AS 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 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 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, thermal
shutdown, and short-circuit protection are
integrated functions of the device.
Table 1. Device summary
Contents STOD13AS2/25 Doc ID 022733 Rev 1
Contents Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Detailed description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126.1 S WIRE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.1.1 SWIRE features and benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.1.2 SWIRE protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.1.3 SWIRE basic operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.2 Negative output voltage levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.3 Enable, S WIRE and FD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147.1 External passive components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.1.1 Inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.1.2 Input and output capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.2 Recommended PCB layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Detailed description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178.1 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.1.1 Multiple operation modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.1.2 Pulse skipping operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.1.3 Discontinuous conduction mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.1.4 Continuous conduction mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.1.5 Enable pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.1.6 Soft-start and inrush current limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.1.7 Undervoltage lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.1.8 Overtemperature protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
STOD13AS ContentsDoc ID 022733 Rev 1 3/25
8.1.9 Short-circuit protection during soft-start (SSD) . . . . . . . . . . . . . . . . . . . 18
8.1.10 Overload protection (OLP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.1.11 Short-circuit protection (SCP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
8.1.12 Fast discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Schematic STOD13AS
4/25 Doc ID 022733 Rev 1
1 Schematic
Figure 1. Application schematic
Note: All the above components refer to the typical application performance characteristics.
Operation of the device is not limited to the choice of these external components. Inductor
values ranging from 3.3 µH to 6.8 µH can be used together with the STOD13AS.
Table 2. Typical external components A 250 mA load can be provided with inductor saturation current as a minimum of 0.9 A. At -6.4 V, a 250 mA load can be provided with inductor saturation current as a minimum of 1.5 A. See Section 7.1.1.
STOD13AS Schematic
Doc ID 022733 Rev 1 5/25
Figure 2. Block schematic
Pin configuration STOD13AS
6/25 Doc ID 022733 Rev 1
2 Pin configuration
Figure 3. Pin configuration (top view)
Table 3. Pin description
STOD13AS Maximum ratings
Doc ID 022733 Rev 1 7/25
3 Maximum ratings
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
The Lx1 and Lx2 have high slew rate and they can be over the absolute maximum rating
during operation due to the parasitic inductance in the PCB and scope probe. An absolute
maximum rating of Lx1 and Lx2 is related to voltage supplied by an external source so the
internally generated Lx1 and Lx2 voltage during normal operation doesn't damage the
chipset.
Table 4. Absolute maximum ratings
Table 5. Thermal data The package is mounted on a 4-layer (2S2P) JEDEC board as per JESD51-7.
Electrical characteristics STOD13AS
8/25 Doc ID 022733 Rev 1
4 Electrical characteristics
TJ = 25 °C, VINA = VINP = 3.7 V , IMID,O2 = 30 mA, CIN = 2 x 10 µF, CMID = 10 µF,
CO2 = 2 x 10 µF, CREF = 1 µF , L1 = L2 = 4.7 µH, VEN = 2 V, VMID = 4.6 V, VO2 = -4.9 V unless
otherwise specified.
Table 6. Electrical characteristics
STOD13AS Electrical characteristics
Doc ID 022733 Rev 1 9/25
Table 6. Electrical characteristics (continued)
Electrical characteristics STOD13AS
10/25 Doc ID 022733 Rev 1 VINA,P = 4.2 to 3.7 V, 3.7 to 3.2 V, 3.4 to 2.9 V, f = 200 Hz; tON = 3.65 ms; tOFF = 1.25 ms; TR = TF = 10 µs, pulse signal.
Table 6. Electrical characteristics (continued)
STOD13AS Typical performance characteristics
Doc ID 022733 Rev 1 11/25
5 Typical performance characteristics
VINA = VINP = 3.7 V, VO2 = -4.9 V, TJ = 25 °C; See Table 1 for external components used in
the tests below.
Figure 4. Maximum power output vs. input
voltage
Figure 5. Efficiency vs. output current
Figure 6. Total system efficiency vs. ILOAD Figure 7. Soft-start and inrush current
Typical performance characteristics STOD13AS
12/25 Doc ID 022733 Rev 1
Figure 8. Fast discharge no load,
EN=SW=FD=Low
Figure 9. Switching and output waveforms
Figure 10. Step-up CCM operation Figure 11. Inverting CCM operation
STOD13AS Detailed description
Doc ID 022733 Rev 1 13/25
6 Detailed description
6.1 S WIRE Protocol: to digitally communicate over a single cable with single-wire components Single-wire's 3 components: an external MCU
2. wiring and associated connectors
3. the STOD13AS device with a dedicated single-wire pin.
6.1.1 S WIRE features and benefits Fully digital signal No handshake needed Protection against glitches and spikes though an internal low pass filter acting on falling
edges Uses a single wire (plus analog ground) to accomplish both communication and power
control transmission Simplify design with an interface protocol that supplies control and signaling over a
single-wire connection to set the output voltages.
6.1.2 S WIRE protocol Single-wire protocol uses conventional CMOS/TTL logic levels (maximum 0.6 V for
logic “zero” and a minimum 1.2 V for logic “one”) with operation specified over a supply
voltage range of 2.5 V to 4.5 V Both master (MCU) and slave (STOD13AS) are configured to permit bit sequential data
to flow only in one direction at a time; master initiates and controls the device Data is bit-sequential with a START bit and a STOP bit Signal is transferred in real time System clock is not required; each single-wire pulse is self-clocked by the oscillator
integrated in the master and is asserted valid within a frequency range of 250 kHz
(maximum).
6.1.3 S WIRE basic operations The negative output voltage levels are selectable within a wide range (steps of 100 mV) The device can be enabled / disabled via S WIRE in combination with the Enable pin.
