STEVAL-ISA044V6 STMicroelectronics, STEVAL-ISA044V6 Datasheet
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STEVAL-ISA044V6
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STEVAL-ISA044V6 Summary of contents
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Features ■ Step-down current mode PWM regulator ■ Output voltage adjustable from 0.8 V ■ Input voltage from 2 ■ output voltage tolerance ■ Synchronous rectification ■ Inhibit function ■ Synchronizable switching frequency ...
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Contents Contents 1 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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ST1S10 1 Application circuit Figure 1. Typical application circuit 12V 12V VIN_SW VIN_SW 4.7µF 4.7µF VIN_A VIN_A C3 C3 0.1µF 0.1µ ST1S10 ST1S10 FB FB SYNC SYNC AGND AGND PGND PGND Doc ID 13844 ...
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Pin configuration 2 Pin configuration Figure 2. Pin connections (top view for PowerSO-8, bottom view for DFN8) DFN8 (4x4) Table 2. Pin description Pin n° Symbol 1 V IN_A 2 INH (EN AGND 5 SYNC 6 ...
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ST1S10 3 Maximum ratings Table 3. Absolute maximum ratings Symbol V Positive power supply voltage IN_SW V Positive supply voltage IN_A V Inhibit voltage INH V Output switch voltage SW V Feedback voltage current FB Sync Synchronization ...
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Electrical characteristics 4 Electrical characteristics IN_SW +0.1 µ µ 3.3 µH, T OUT the typical application circuit. Typical values assume T Table 5. Electrical characteristics Symbol Parameter V Feedback ...
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ST1S10 Table 5. Electrical characteristics (continued) Symbol Parameter I I SYNC input current IL, IH UVLO Under voltage lock-out threshold 1. Guaranteed by design, but not tested in production. 2. See output voltage selection paragraph 5.5 for maximum duty cycle ...
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Application information 5 Application information 5.1 Description The ST1S10 is a high efficiency synchronous step-down DC-DC converter with inhibit function. It provides over an input voltage range of 2 and the output ...
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ST1S10 Equation OUT F where V is the voltage drop across the internal NMOS, and V F drop across the internal PDMOS. The minimum duty cycle (at V duty cycle (at ...
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Application information reduce ripple voltages due to the parasitic inductive effect, the output capacitor connection paths should be kept as short as possible. The ST1S10 has been designed to perform best with ceramic capacitors. Under typical application conditions a minimum ...
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ST1S10 Equation {[ OUT OUT is the junction-to-ambient thermal resistance, η is the efficiency at the rated where R thJA I current and T OUT To ensure safe operating conditions the application should be ...
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Application information 5.8.2 Inhibit function The inhibit pin can be used to turn OFF the regulator when pulled down, thus drastically reducing the current consumption down to less than 6 µA. When the inhibit feature is not used, this pin ...
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ST1S10 Figure 3. Application schematic for heavy capacitive load 12V 12V VIN_SW VIN_SW 10µF 10µF VIN_A VIN_A C3 C3 4.7µF 4.7µF (*) see OCP and SCP descriptions for C2 and C4 selection Figure 4. Application schematic ...
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Layout considerations 6 Layout considerations Layout is an important step in design for all switching power supplies. High-speed operation (900 kHz) of the ST1S10 device demands careful attention to PCB layout. Care must be taken in board layout to get ...
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ST1S10 Figure 7. PCB layout suggestion 6.1 Thermal considerations The lead frame die pad, of ST1S10, is exposed at the bottom of the package and must be soldered directly to a properly designed thermal pad on the PCB, the addition ...
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Diagram 7 Diagram Figure 8. Block diagram 16/26 Doc ID 13844 Rev 4 ST1S10 ...
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ST1S10 8 Typical performance characteristics Unless otherwise specified, refer to the typical application circuit under the following conditions 25° mA, C OUT IN Figure 9. Voltage feedback vs. temperature 830 830 830 820 ...
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Typical performance characteristics Figure 15. ON mode quiescent current vs. temperature 1.8 1.8 1.6 1.6 1.4 1.4 1.2 1 0.8 0.8 0.6 0.6 0.4 0 =12V, V =12V, V =1.2V, V =1.2V, V IN-A ...
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ST1S10 Figure 21. Efficiency vs. output current 100 100 =5V, V =5V, V IN-A IN-A IN-SW IN-SW INH INH 0.5 0.5 1 ...
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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 ...
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ST1S10 PowerSO-8 (exposed pad) mechanical data Dim ccc mm. Min. Typ. 0.00 1.25 0.31 0.17 4.80 4.90 ACCORDING TO PAD SIZE 5.80 6.00 3.80 3.90 ACCORDING ...
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Package mechanical data Dim. Min 0.23 D 3.90 D2 2.82 E 3. 0.40 22/26 DFN8 (4x4) mechanical data mm. Typ. Max. 0.90 1.00 0.02 0.05 0.20 0.30 0.38 4.00 4.10 ...
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ST1S10 Dim. Min 12 8.1 Bo 5.5 Ko 2.1 Po 3.9 P 7.9 Tape & reel SO-8 mechanical data mm. Typ. Max. 330 13.2 22.4 8.5 5.9 2.3 4.1 8.1 Doc ID ...
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Package mechanical data Tape & reel QFNxx/DFNxx (4x4) mechanical data Dim. Min 12 24/26 mm. Typ. Max. Min. 330 13.2 0.504 0.795 101 3.898 14.4 4.35 4.35 1.1 ...
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ST1S10 10 Revision history Table 6. Document revision history Date Revision 28-Aug-2007 1 24-Sep-2007 2 25-Oct-2007 3 10-Mar-2011 4 Initial release. Add R on Table 4. thJC Added new paragraph 6: Layout considerations. Updated PowerSO-8 package mechanical data and Doc ...
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