STW41411 ST-Ericsson Inc, STW41411 Datasheet
STW41411
Specifications of STW41411
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STW41411 Summary of contents
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IMPORTANT NOTICE Dear customer from August 2 2008, the wireless operations of STMicroelectronics have moved to a new company, ST-NXP Wireless result, the following changes are applicable to the attached document. ● Company name - STMicroelectronics ...
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Single-coil dual-output step-down DC/DC converter for digital base band and multimedia processor supply Features ■ Single coil dual output switching converter for digital core supply & digital I/Os supply – Digital I/O supply:V OUT1 – CPU CORE supply:V OUT2 ■ ...
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Contents Contents 1 STw4141 pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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STw4141 4.6.2 4.6.3 4.6.4 4.7 PCB layout considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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List of tables List of tables Table 1. STw4141 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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STw4141 List of figures Figure 1. Pin assignment in TFBGA 3x3 bumps 0.5 mm pitch . . . . . . . . . . . . . . . . . . . . . . ...
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STw4141 pinout 1 STw4141 pinout Figure 1. Pin assignment in TFBGA 3x3 bumps 0.5 mm pitch PGND VLX1 VLX2 B B PVDD STATE T_MODE C C MODE/ AUTO VSEL ...
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STw4141 Table 1. STw4141 pin description (continued) Pin Symbol B4 VOUT2 C4 GND D4 EN This is the ground pin related to power signal. This pin should be connected to the board ground PGND pin plane by short and wide ...
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Electrical characteristics 2 Electrical characteristics 2.1 Absolute maximum ratings Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. All voltages are referenced to GND. Table 2. Absolute ...
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STw4141 2.3 DC electrical characteristics Characteristics measured over recommended operating conditions unless otherwise is noted. All typical values are referred to T Table 4. DC electrical characteristics Symbol Parameter PVDD Power supply voltage I Peak current limit LIM (1) (2) ...
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Electrical characteristics Table 4. DC electrical characteristics (continued) Symbol Parameter Auto functions Voltage selection V H AUTO threshold high Voltage selection V L AUTO threshold low State functions Voltage selection V H STATE threshold high Voltage selection V L STATE ...
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STw4141 2.5 Soft start To avoid spikes on battery during STw4141 start-up sequence, a smooth start-up is implemented. Reference voltage grows up less than 600 µs until it achieves is final target. Therefore, STw4141 start up is smooth and secure ...
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Electrical characteristics 2.7 Line transients Figure 4. Line transient, V 2.8 Load transients in AUTO mode Figure 5. Load transient in AUTO mode V 12/30 = 1.8V @ 100mA, V OUT1 OUT2 = 3.6V OUT1 STw4141 = 1.2V ...
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STw4141 2.9 Load transients in PWM mode Figure 6. Load transient in PWM mode, I Load transient related to in-phase switching V = 3.6V 1.8V OUT1 Load transient output 2 leading output 3.6V, ...
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Electrical characteristics 2.10 Switching between PFM and PWM in FORCED mode Figure 7. Switching between PFM to PWM - V Figure 8. Switching between PWM to PFM - V 14/30 = 3.6V 10mA OUT1 OUT2 = ...
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STw4141 2.11 Efficiency in PWM The efficiency of a switching regulator is equal to the total output power divided by the input. STw4141 has high efficiency up to 92% (for the 2 outputs). Efficiency curve is flat over the output ...
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Electrical characteristics 2.12 Efficiency in AUTO The efficiency of a switching regulator is equal to the total output power divided by the input. STw4141 has high efficiency up to 92% (both outputs) and always higher than 70% for output currents ...
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STw4141 2.13 Output voltages versus output currents in PWM and PFM Figure 11. Output voltages versus output currents in PWM and PFM OUT1 OUT1 1.830 V = 3.6V IN 1.820 1.810 1.800 1.790 1.780 1.770 ...
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Functional description 3 Functional description Introduction The STw4141 is an easy to use, single coil dual outputs step down DC/DC converter optimized to supply low-voltage to CPUs or DSPs in cell phones and other miniature devices powered by single cell ...
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STw4141 4 Application information 4.1 User mode details The following table describes the different user modes available. Depending on the application constraints (processor I/O pins available) and expected efficiency, PWM or PFM mode are forced or automatically controlled by STw4141 ...
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Application information 4.2 Automatic PWM/PFM mode This user mode is designed to allow STw4141 to switch automatically between PWM and PFM modes. This feature improves the application efficiency because STw4141 enters in PFM mode according to application processor current consumption. ...
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STw4141 4.4 External clock synchronization Figure 14. Application using external clock synchronization V V =2.7V to 5.5V =2.7V to 5.5V PVDD PVDD VDD VDD µF 10 µF 6 ...
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Application information 4.6.2 Input capacitor (CIN selection) Input capacitor of 10 µF ceramic low ESR capacitor should be used to reduce switching losses. It should be placed as close as possible to supply pins VDD and PVDD. The connection traces ...
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STw4141 4.7 PCB layout considerations The Printed Circuit Board layout must include the following consideration: Current paths carrying high currents (bold lines in minimize impedance in order to reduce looses and EMI. Small currents flow through voltage paths. No specific ...
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Application information 4.7.1 PCB layout Figure 16 and Figure 17 board. Figure 16. Demoboard top layer 4.7.2 TFBGA16 internal bumps access Pad centers are at 500 µm distance. Pad diameter is 275 µm. The distance between two adjacent pad edges ...
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STw4141 Figure 19. PCB routing example using TFBGA16 Application information 25/30 ...
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Package outline and mechanical data 5 Package outline and mechanical data Table 10. TFBGA 3x3x1.20 16 F4x4 0.50. Package code JEDEC/EAIJ Ref ddd eee fff Note: 1 Max mounted ...
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STw4141 Figure 20. TFBGA 3x3x1.20 16 F4x4 0.50 Package outline and mechanical data 27/30 ...
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... Ordering information 6 Ordering information Table 11. STw4141 order codes Part number Package STw41411 STw41411/T STw41412 STw41412/T STw41413 STw41413/T TFBGA STw41414 3x3x1.2 STw41414/T 16 balls STw41415 STw41415/T STw41416 STw41416/T STw41417 STw41417/T 1. The output configuration which will be introduced in production will be only those related to customer design-in. ...
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STw4141 7 Revision history Table 12. Document revision history Date 24-Jan-2006 9-Jun-2006 Revision 1 Initial release. Updates in Table 8: Bill of material: inductor selection Table 9: Bill of Material: capacitor selection Updates in 2 Moved Ordering information the order ...
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Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any ...