STOD03AS STMicroelectronics, STOD03AS Datasheet
STOD03AS
Specifications of STOD03AS
Available stocks
Related parts for STOD03AS
STOD03AS Summary of contents
Page 1
... Dual DC-DC converter for powering AMOLED displays from WIRE Description The STOD03AS is a dual DC-DC converter with short-circuit protection 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 light load conditions and PWM-MODE at 1 ...
Page 2
... WIRE S basic operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 WIRE Inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Input and output capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Multiple operation modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Pulse skipping operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Discontinuous conduction mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Continuous conduction mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Enable pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Soft-start and inrush current limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Undervoltage lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Overtemperature protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Short-circuit protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Doc ID 022614 Rev 1 STOD03AS ...
Page 3
... STOD03AS 8.1.10 9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Fast discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Doc ID 022614 Rev 1 Contents 3/24 ...
Page 4
... At -5 200 mA load can be provided with inductor saturation current as a minimum See 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 STOD03AS. 4/24 Part number Value ...
Page 5
... STOD03AS Figure 2. Block schematic Doc ID 022614 Rev 1 Schematic 5/24 ...
Page 6
... Inverting converter output voltage (Default - 4.9V) Switching node of the inverting converter Analogic input supply voltage Power input supply voltage Internally connected to AGND. Exposed pad must be connected to AGND and PGND in the PCB layout in order to guarantee proper operation of the device Doc ID 022614 Rev 1 STOD03AS ...
Page 7
... STOD03AS 3 Maximum ratings Table 4. Absolute maximum ratings Symbol supply voltage INA INP EN, S Logic input pins WIRE IL Inverting converter switching current X2 L Inverting converter switching node voltage X2 V Inverting converter output voltage O2 V Step-up converter and LDO output voltage MID ...
Page 8
... T =T =50µs MID R F Doc ID 022614 Rev µ µF, IN MID = 4 -4.9 V unless EN MID O2 Min. Typ. Max. 2.3 3.7 4.5 2.22 2.25 1.9 2.18 1.7 2.1 1.2 0.4 1.2 1.5 1 1.216 1.228 1.240 100 no 4.55 4.6 4.65 O2 =5mA; ±0.5 -12 STOD03AS Unit µ µA MHz % % % % V µ ...
Page 9
... STOD03AS Table 6. Electrical characteristics (continued) Symbol Parameter Δ V Load transient regulation MIDT TDMA noise line transient V MID-PP regulation I Max. step-up load current MID MAX I-L Step-up inductor peak current 1MAX P-channel static drain-source R P1 DSON ON resistance N-channel static drain-source R N1 DSON ON resistance ...
Page 10
... Thermal shutdown OTP Overtemperature protection Overtemperature protection OTP HYST hysteresis Discharge resistor R Resistor value DIS T Discharge time DIS 10/24 Test conditions Min. No load No load 10% of MID O2 nominal value Doc ID 022614 Rev 1 STOD03AS Typ. Max. Unit 140 °C 15 °C Ω 400 8 ms ...
Page 11
... STOD03AS 5 Typical performance characteristics 4 Figure 4. Efficiency vs. input voltage 90% 88% 86% 84% 82% 80% 78% 76% 74% 72% 70% 68% 66% 2.5 2.7 2.9 3.1 3.3 3.5 V [V] IN Figure 6. Input current vs. V Figure 8. Fast discharge °C; See Table 1 for external components used in the tests below. Figure 5. 90% 85% 80% 75% 70% 65% ...
Page 12
... 100 mA, T INA INP MID,O2 12/24 Figure 11. Inverting CCM operation °C EN INA INP A Figure 13. Output voltage vs. input voltage I 10.00 9.00 8.00 7.00 6.00 5.00 4.00 3.00 2.00 1.00 0.00 1 µ Doc ID 022614 Rev 1 STOD03AS = 3 100 mA ° 200 mA 4 -40 °C 25 °C 85 °C 1.8 2 2.2 2.4 2.6 2 ...
Page 13
... V for logic “one”) with operation specified over a supply voltage range of 2 4.5 V ● Both master (MCU) and slave (STOD03AS) are configured to permit bit sequential data to flow only in one direction at a time; master initiates and controls the device ● ...
Page 14
... S WIRE Low High Low High function. WIRE Doc ID 022614 Rev 1 STOD03AS Pulse -3.4 22 -3.3 23 -3.2 24 -3.1 25 -3.0 26 -2.9 27 -2.8 28 -2.7 29 -2.6 30 -2.5 31 -2.4 Action Device off Negative output set by S WIRE Default negative output voltage Default negative output voltage ...
Page 15
... O2 value output current for both DC-DC converters input voltage for the STOD03AS switching frequency. Use the minimum value of 1.2 MHz for the worst case; s η1: efficiency of step-up converter. Typical value is 0.85; η2: efficiency of inverting converter. Typical value is 0.75. ...
Page 16
... Application information 7.2 Recommended PCB layout The STOD03AS is high frequency power switching device and therefore requires a proper PCB layout in order to obtain the necessary stability and optimize line/load regulation and output voltage ripple. Analog input (V INA at the C pad only. The input capacitor must be as close as possible to the IC. ...
Page 17
... STOD03AS Figure 15. Bottom layer and silk-screen (top view, not to scale) Doc ID 022614 Rev 1 Application information 17/24 ...
Page 18
... Pulse skipping operation The STOD03AS works in pulse skipping mode when the load current is below some tens of mA. The load current level at which this way of operation occurs depends on input voltage only for the step-up converter and on input voltage and negative output voltage (V inverting converter ...
Page 19
... When the EN is pulled high, the P1B switch is turned on for 100 µs. In normal operation, during this time, apart of a small drop due to parasitic resistance, V If, after this 100 µs, V pulse is applied to the EN. This mechanism avoids the STOD03AS starting if a short-circuit is present on V MID 8 ...
Page 20
... Package mechanical data 9 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ® ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at trademark. 20/24 Doc ID 022614 Rev 1 STOD03AS www.st.com . ECOPACK ...
Page 21
... STOD03AS Table 9. DFN12L ( mechanical data Dim. Min 0.18 D 2.85 D2 1.87 E 2. 0.30 Figure 16. DFN12L ( drawing mm. Typ. Max. Min. 0.55 0.60 0.020 0.02 0.05 0 0.20 0.25 0.30 0.007 3 3.15 0.112 2.02 2.12 0.074 3 3.15 0.112 1.21 1.31 0.042 0.45 0.40 0.50 0.012 Doc ID 022614 Rev 1 Package mechanical data inch. Typ. Typ. 0.022 0.024 0.001 0.002 0.008 ...
Page 22
... Package mechanical data Figure 17. DFN12L ( mm) footprint recommended data 22/24 Doc ID 022614 Rev 1 STOD03AS ...
Page 23
... STOD03AS 10 Revision history Table 10. Document revision history Date Revision 20-Dec-2011 1 Initial release. Doc ID 022614 Rev 1 Revision history Changes 23/24 ...
Page 24
... Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America 24/24 Please Read Carefully: © 2011 STMicroelectronics - All rights reserved STMicroelectronics group of companies www.st.com Doc ID 022614 Rev 1 STOD03AS ...