STOD02PUR STMICROELECTRONICS | Alldatasheet

Document overview

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  • PDF pages: 23

Technical content

Datasheet sections

  • 1 Diagram
  • 2 Pin configuration
  • 3 Maximum ratings
  • 4 Application
  • 5 Electrical characteristics
  • 6 S-wire protocol
  • 7 Typical performance characteristi cs
  • 8 Demonstration board
  • 9 Package mechanical data
  • 10 Revision history

Features

■ Step-up and inverter converters ■ Operating input voltage range from 2.5 V to 4.5 V ■ Synchronous rectification for both DC-DC converters ■ 150 mA maximum output current ■ 4.6 V fixed positive output voltage ■ Programmable negative voltage by S-wire from - 2.3 V to - 5.9 V ■ Typical efficiency: 85 % ■ Pulse skipping mode in light load condition (IO < 10 mA) ■ 1.6 MHz PWM mode control switching frequency (I O > 10 mA) ■ Enable pin for shutdown mode ■ Low quiescent current: < 1 µA in shutdown mode ■ Soft-start with inrush current protection ■ Over temperature protection ■ Temperature range: -40 °C to 85 °C ■ True shutdown mode ■ Fast outputs discharge circuit after shutdown ■ Package: DFN 12 leads - (3 x 3 mm)

Applications

■ Active matrix organic LED power supply (AMOLED) ■ Mobile phones ■ PDAs ■ Camcorders and digital still cameras

Description

The STOD02 is a dual DC-DC converter meant to power AMOLED displays. It integrates a step up and an inverting DC-DC converter making it particularly suitable for battery operated products, where the major concern is the overall system efficiency. STOD02 works in pulse skipping mode during low load condition and in PWM-mode (at 1.6 MHz) for medium/high load condition. The high frequency allows reducing the value and number of external components just to 6 components needed. The enable pin allows turning off the device so reducing the current consumption to less that 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. DFN12L (3 x 3 mm) Table 1. Device summary

1 Diagram

Figure 1. Block diagram

2 Pin configuration

Figure 2. Pin connections (top view) Table 2. Pin description

2 PGND Power ground pin

4 NC Not connected

7 S-wire Negative voltage settin g pin, uses S-wire protocol

10 L X2 Switching node of the inverting converter

11 V INA Analog input supply voltage

12 V INP Power input supply voltage

the PCB layout in order to guarantee proper operation of the device.

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. Table 3. Absolute maximum ratings Table 4. Thermal data

4 Application

Figure 3. Typical application circuit Table 5. Typical external components

5 Electrical characteristics

Table 6. Electrical characteristics

Table 6. Electrical characteristics (continued)

6 S-wire protocol

Figure 4. S-wire protocol Table 7. Time

Figure 5. Waveform Table 8. Time Table 9. Inverting output voltages

Note: Enable pin must be set to GND while using S-wire function. Table 10. Enable and s-wire pin settings Figure 6. Single wire programming

7 Typical performance characteristics

Figure 7. Efficiency vs. input voltage F igure 8. Efficiency vs. output current Figure 9. Step-up inductor peak current vs. Figure 10. Inverting inductor peak current vs. Figure 11. PWM step-up frequency vs. Figure 12. PWM inverting frequency vs.

Figure 19. Fast discharge

8 Demonstration board

Figure 20. Suggested demonstration board schematic (top layer view) Figure 21. Suggested demonstration board schematic (bottom layer view)

9 Package mechanical data

specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Table 11. DFN12L (3 x 3 x 0.8 mm) mechanical data

Figure 22. Drawing dimension DFN12L (3 x 3 x 0.8 mm)

Dim. mm. inch. A1 0 0.02 0.05 0 0.001 0.002 A3 0.20 0.00 8 e 0.45 0.01 8 DFN12L (3 x 3 x 0.6 mm) mechanical data 8085116/A

DIM. mm. inch A 330 12. 992 C 12. 8 13.2 0.504 0.51 9 D 20.2 0.7 95 N 99 101 3.898 3 .976 T 14.4 0.567 Ao 3.3 0.130 Bo 3.3 0.130 Ko 1.1 0.04 3 Po 4 0.157 P 8 0.315 Tape & reel QFNxx/DFNxx (3x3) mechanical data

Figure 23. DFN12L (3 x 3 mm) footprint recommended data

Table 12. Document revision history 05-Dec-2008 1 Initial release. 15-Dec-2008 2 Added: pin description exposed pad Table 2 on page 4. 30-Jun-2009 3 Modified: Table 2 on page 4.