STBB1-APUR STMicroelectronics, STBB1-APUR Datasheet
STBB1-APUR
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STBB1-APUR Summary of contents
Page 1
... NiMH applications where the output voltage is within the battery voltage range. The Table 1. Device summary Order code STBB1-APUR October 2011 1 A, high efficiency single inductor dual mode buck-boost DC-DC converter DFN10 ( mm) integrated low-R DSon MOSFET switches contribute to its high efficiency ...
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... Programming the output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 8.2 Inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 8.3 Input and output capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 9 Recommended PCB layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 10 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 11 Different output voltage versions of the STBB1-A available on request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2/22 Soft-start and short-circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Undervoltage lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Over-temperature protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Doc ID 022197 Rev 2 STBB1-AXX ...
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... STBB1-AXX 1 Block diagram Figure 1. STBB1-A block diagram Oscillator Oscillator VINA VINA DEVICE DEVICE MODE/SYNC MODE/SYNC CONTROL CONTROL EN EN SW1 SW1 Control Control Current Current sensor sensor Modulator Modulator Temp. Temp. Control Control GND GND Block diagram SW2 SW2 V V OUT ...
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... Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. Table 3. Thermal data Symbol R Thermal resistance junction-case thJC R Thermal resistance junction-ambient thJA 4/22 Parameter Parameter Doc ID 022197 Rev 2 STBB1-AXX Value Unit - 0 150 ° 150 ° ...
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... If MODE pin is low, the STBB1-A automatically switches between pulse skipping and fixed frequency PWM according to the load level. If MODE pin is pulled high, the STBB1-A works always in PWM mode. When a square waveform is applied, this pin provides the clock signal for oscillator synchronization ...
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... Application circuit - adjustable output version Figure 4. Application circuit - fixed output version 6/22 L SW2 SW1 OUT Vin VinA STBB1-APUR EN FB MODE/SYN GND PGND L SW2 SW1 Vin VinA STBB1-APUR33 EN MODE/SYN GND PGND Doc ID 022197 Rev 2 STBB1-AXX V OUT C R1 OUT R2 AM07860v1 V OUT OUT C OUT FB AM07861v1 ...
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... Murata COUT Murata TDK L Coilcraft Above listed components refer to typical application. Operation of the STBB1-A is not limited to the choice of these external components and R2 are calculated according to the following formula OUT FB Suggested value for R2 is 100 kΩ. In order to reduce the quiescent current a maximum value of 500 kΩ is possible. ...
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... °C). A Min. Typ. 2.0 1.70 1.50 1.60 485 500 490 500 1 160 = V 600 IN 200 3.4 0.1 1300 1500 1300 1.2 0.01 1.2 0. 0.5 OUT 1 1.6 2.3 0.01 0.01 0.13 0.13 STBB1-AXX Max. Unit 5.5 V 1.80 V 515 mV 510 mV 5.5 V MΩ 250 µA 750 µA 5 µA 1750 kHz 2000 0 µA 0 µ 2 µA 1 µA Ω ...
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... STBB1-AXX Table 6. Electrical characteristics (continued) Symbol Parameter Efficiency 3 ν Thermal shutdown SHDN T Thermal shutdown hysteresis HYS Test conditions mA OUT MODE = OUT mA OUT MODE I = 100 mA OUT MODE Doc ID 022197 Rev 2 Electrical characteristics Min. Typ. Max. ...
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... In addition, the peak inductor current is monitored to avoid saturation of the coil. The STBB1-A can work in two different modes: PWM mode or power save mode. In the first case the device operates with a fixed oscillator frequency in all line/load conditions. This is the suitable condition to obtain the maximum dynamic performances ...
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... Undervoltage lockout The undervoltage lockout function prevents improper operation of STBB1-A when the input voltage is not high enough. When the input voltage is below the VUVLO threshold the device is in shutdown mode. The hysteresis of 100 mV prevents unstable operation when the input voltage is close to the UVLO threshold ...
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... Figure 3 Efficiency vs PWM mode OUT 100 100 Output Current [mA] Output Current [mA PWM transition 2.1 2.4 2.7 3 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 VIN [V] TIMEBASE: 2 µs/div = 3 mA, pulse skipping O O STBB1-AXX and external 1000 1000 ...
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... STBB1-AXX Figure 11. Boost region operation SW1 3 V/div SW2 3 V/div I L 0.2 A/div mV/div AC Coupled TIMEBASE: 0.5µs/div 200 mA, PWM mode Figure 13. Buck-boost region operation SW1 3 V/div SW2 3 V/div I L 0.3 A/div mV/div AC Coupled TIMEBASE: 0.5 µs/div ...
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... Application information 8.1 Programming the output voltage The STBB1-A is available in two versions: fixed output voltage (STBB1-APURXX) and adjustable output voltage (STBB1-APUR). In the first case the device integrates the resistor divider needed to set the correct output voltage. This allows the saving of 2 external components. The FB pin must be connected directly to V ...
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... I − PEAK BOOST η Where η is the estimated efficiency of STBB1-A. The maximum of the two values above must be considered when selecting the inductor. 8.3 Input and output capacitor selection It is recommended to use ceramic capacitors with low ESR as input and output capacitors in order to filter any disturbance present in the input line and to obtain stable operation. ...
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... Recommended PCB layout 9 Recommended PCB layout Figure 17. Component placement Figure 18. Top layer routing Figure 19. Bottom layer routing 16/22 Doc ID 022197 Rev 2 STBB1-AXX ...
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... STBB1-AXX 10 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: ECOPACK® trademark. Doc ID 022197 Rev 2 Package mechanical data www ...
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... Package mechanical data Dim. Min 0.18 D 2.85 D2 2.20 E 2. 0.30 ddd 18/22 DFN10 (3x3 mm) mechanical data mm. Typ. Max. 0.90 1.00 0.02 0.05 0.65 0.80 0.20 0.25 0.30 3.00 3.15 3.00 3.15 1.75 0.50 0.40 0.50 0.08 Doc ID 022197 Rev 2 STBB1-AXX mils. Min. Typ. 31.5 35.4 0.8 21.7 25.6 7.9 7.1 9.8 112.2 118.1 86.6 112.2 118.1 55.1 19.7 11.8 15.7 7426335F Max. 39.4 2.0 31.5 11.8 124.0 124.0 68.9 19.7 3.1 ...
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... STBB1-AXX Tape & reel QFNxx/DFNxx (3x3) mechanical data Dim. Min 12 mm. Typ. Max. Min. 180 13.2 0.504 0.795 2.362 14.4 3.3 3.3 1 Doc ID 022197 Rev 2 Package mechanical data inch. Typ. Max. 7.087 0.519 0.567 0.130 0.130 0.043 0.157 0.315 ...
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... Different output voltage versions of the STBB1-A available on request 11 Different output voltage versions of the STBB1-A available on request Table 7. Options available on request Order codes STBB1-APUR18 STBB1-APUR25 STBB1-APUR28 STBB1-APUR33 20/22 Marking BB1 18 BB1 25 BB1 28 BB1 33 Doc ID 022197 Rev 2 STBB1-AXX Output voltages 1.8 V 2.5 V 2.8 V 3.3 V ...
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... STBB1-AXX 12 Revision history Table 8. Document revision history Date Revision 07-Sep-2011 1 04-Oct-2011 2 First release. Added condition °C for the oscillator frequency parameter in A page 8. Doc ID 022197 Rev 2 Revision history Changes Table 6 on 21/22 ...
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... 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 22/22 Please Read Carefully: © 2011 STMicroelectronics - All rights reserved STMicroelectronics group of companies www.st.com Doc ID 022197 Rev 2 STBB1-AXX ...