STW4141 STMicroelectronics, STW4141 Datasheet
STW4141
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STW4141 Summary of contents
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... Digital still camera ■ WLAN and Bluetooth applications Description The STw4141 is a single coil dual output synchronous step down DC/DC converter that requires only four standard external components. It operates at a fixed 900 kHz switching frequency in PWM mode. The device can operate in PFM mode to maintain high efficiency over the full range of output currents ...
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... Contents Contents 1 STw4141 pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3 DC electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.4 Dynamic electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.5 Soft start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.6 Settling time of VOUT2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.7 Line transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.8 Load transients in AUTO mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.9 Load transients in PWM mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2.10 Switching between PFM and PWM in FORCED mode . . . . . . . . . . . . . . 14 2.11 Efficiency in PWM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2 ...
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... STw4141 4.6.2 4.6.3 4.6.4 4.7 PCB layout considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.7.1 4.7.2 5 Package outline and mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . 26 6 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Input capacitor (CIN selection Output capacitors (COUT selection Capacitors selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 PCB layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 TFBGA16 internal bumps access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Contents 3/30 ...
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... Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 3. Thermal data Table 4. DC electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Table 5. Dynamic electrical characteristics Table 6. STw4141 available user modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 7. Operating mode information (STATE pin - digital output Table 8. Bill of material: inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Table 9. Bill of Material: capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Table 10. TFBGA 3x3x1.20 16 F4x4 0.50. Package code JEDEC/EAIJ . . . . . . . . . . . . . . . . . . 26 Table 11 ...
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... STw4141 List of figures Figure 1. Pin assignment in TFBGA 3x3 bumps 0.5 mm pitch . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 2. Smooth start-up sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 3. Settling time of VOUT2, IOUT1 = 200mA, IOUT2 = 400mA . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 4. Line transient, VOUT1 = 1.8V @ 100mA, VOUT2 = 1.2V @ 100mA . . . . . . . . . . . . . . . . . 12 Figure 5. Load transient in AUTO mode VIN = 3.6V, VOUT1 = 1.8V, VOUT2 = 1. Figure 6. Load transient in PWM mode, IOUT1 = 1mA to 200mA, IOUT2 = 1mA to 400mA Figure 7 ...
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... Input signal for test mode selection. This pin must be connected to GND. Voltage selection input VSEL = High - VOUT1 = 1.8V, VOUT2 = 1.2V (valid for STA1) VSEL = Low - VOUT1 = 1.8V, VOUT2 = 1.0V (valid for STA1) (For other voltage options see Table 1: STw4141 ordering information Signal supply voltage Output voltage ...
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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 track or multiply vias to reduce impedance and EMI. GND pins This is the ground pin related to analog signal. ...
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... A T Maximum operating junction temperature J T Storage temperature range STG 2.2 Thermal data Table 3. Thermal data Symbol Thermal Resistance Junction-Ambient R thJA TFBGA 3x3 mm – 16 bumps - 0.5 mm pitch 8/30 Parameter Parameter STw4141 Value Unit - ...
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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) V Output voltage 1 OUT1 (2) Output voltage 2 V OUT2 (2) Output voltage 2 ...
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... Settling time TS2 V (reduced)/V OUT2 OUT2 10/30 Test Conditions R = 100k 10pF Lmax Lmax R = 100k 10pF Lmax Lmax = 25°C, PVDD = 3.6V, VDD = 3.6V. A Test Conditions VSEL change from GND to VDD STw4141 Min. Typ Max. 0.9 0.4 0.7V OUT1 0.3 V OUT1 Min. Typ Max. 900 600 1500 400 80 Unit ...
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... 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 for the overall mobile phone. Figure 2 illustrates a smooth start up sequence where ...
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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 @ 100mA = 1.8V 1.2V OUT2 ...
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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 1.8V OUT1 = 1mA to 200mA, I OUT1 Load transient output 1 leading output 1.2V OUT2 Load transient related to anti-phase switching ...
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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 = 3.6V 10mA OUT1 OUT2 STw4141 = 10mA = 10mA ...
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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 current range. Figure 9. Switching regulator efficiency in PWM mode Efficiency in PWM mode @ V ...
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... 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 higher than 1mA. Figure 10. Switching regulator efficiency in auto mode Efficiency VS output currents I ...
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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 (mA) OUT1 OUT1 OUT1 1.830 V = 3.6V IN 1.820 1.810 1 ...
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... 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 lithium-ion or 3 cell NiMH/NiCd batteries. It provides two different output voltages with high efficiency operation in a wide range of output currents. The device offers high DC voltage regulation accuracy and load transient response to satisfy demanding processor core supply ...
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... 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 internal digital gates. Table 6. STw4141 available user modes Mode OFF ...
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... User selected PWM/PFM mode STw4141 PWM/PFM mode can also be controlled by the application processor. This feature is accessible through MODE/SYNC pin state useful to users who want to use STw4141 with the modem digital processor. Therefore, MODE/SYNC pin is connected to SLEEP mobile phone signal. Figure 13. PWM/PFM forced mode schematic example ...
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... ESR. 4.6 Bill of Material 4.6.1 Inductor selection The choice of which inductor to use depends on the price and size versus performance required with the STw4141 application. that work well in STw4141 applications. Table 8. Bill of material: inductor selection Part number VFL4012A-4R7M1R1 VFL3012A-4R7MR74 744031004 L 4.7 µ ...
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... The connection traces should be wide OUTx Supplier Part number GRM188R60J106ME47D GRM21BR60J106ME15L JMK212BJ106MG-T C1608X5R0J106MT C2012X5R0J106MT GRM188R60J106ME47D GRM21BR60J106ME15L GRM21BR60J226ME15L JMK212BJ106MG-T JMK212BJ226MG-T C1608X5R0J106MT C2012X5R0J106MT C2012X5R0J226MT STw4141 Value Case size 10 µF, 6.3V 0603 10 µF, 6.3V 0805 10 µF, 6.3V 0805 10 µF, 6.3V 0603 10 µF, 6.3V 0805 µF, 6. 0603 µF, 6. 0805 22 µ ...
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... PVDD PVDD VDD VDD µF 10 µF 6 AUTO AUTO STw4141 STw4141 C2 C2 VSEL VSEL C3 C3 MODE/SYNC MODE/SYNC PGND PGND GND GND Application information Figure 15 ) must be wide and short to VLX2 VLX2 VOUT1 ...
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... Figure 19 and Figure 18. TFBGA16 ball pad spacing and track parameters to internal pads Grid dot distance : 24/30 show the PCB layout. All components are on the top side of the Figure 17. Demoboard assembled with 22 µF output capacitor ). STw4141 with A = 500µ 275µ 75µm ...
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... STw4141 Figure 19. PCB routing example using TFBGA16 Application information 25/30 ...
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... The axis perpendicular to datum C of each ball must lie within the tolerance zone. Each tolerance zone fff in the array is contained entirely in the respective above eee zone above. The axis of each ball must be simultaneously in both tolerance zones. 5 Leadfree package according to JEDEC JESD-020-C 26/30 Min. Typ. 1.01 0.15 0.82 0.25 0.30 2.85 3.00 1.50 2.85 3.00 1.50 0.50 0.85 STw4141 Max. 1.20 ( Note 1 ) 0.35 3.15 3.15 0.08 0.15 0.05 ...
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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 codes.. Revision history Changes to the end of the document and updated ...
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... Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America 30/30 Please Read Carefully: © 2006 STMicroelectronics - All rights reserved STMicroelectronics group of companies www.st.com STw4141 ...