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ST1S10 Dataheets PDF



Part Number ST1S10
Manufacturers STMicroelectronics
Logo STMicroelectronics
Description monolithic synchronous step-down regulator
Datasheet ST1S10 DatasheetST1S10 Datasheet (PDF)

ST1S10 3 A, 900 kHz, monolithic synchronous step-down regulator IC DFN8 (4 x 4 mm) PowerSO-8 Features • Step-down current mode PWM regulator • Output voltage adjustable from 0.8 V • Input voltage from 2.5 V up to 18 V • 2% DC output voltage tolerance • Synchronous rectification • Inhibit function • Synchronizable switching frequency from 400 kHz up to 1.2 MHz • Internal soft start • Dynamic short-circuit protection • Typical efficiency: 90% • 3 A output current capability • Standby supply cu.

  ST1S10   ST1S10


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ST1S10 3 A, 900 kHz, monolithic synchronous step-down regulator IC DFN8 (4 x 4 mm) PowerSO-8 Features • Step-down current mode PWM regulator • Output voltage adjustable from 0.8 V • Input voltage from 2.5 V up to 18 V • 2% DC output voltage tolerance • Synchronous rectification • Inhibit function • Synchronizable switching frequency from 400 kHz up to 1.2 MHz • Internal soft start • Dynamic short-circuit protection • Typical efficiency: 90% • 3 A output current capability • Standby supply current: max. 6 µA over temperature range • Operative junction temp.: from -40 °C to 125 °C Applications • Consumer – STB, DVD, DVD recorders, TV, VCR, car audio, LCD monitors • Networking – XDSL, modems, DC-DC modules • Computer – Optical storage, HD drivers, printers, audio/graphic cards • Industrial and security – Battery chargers, DC-DC converters, PLD, PLA, FPGA, LED drivers Datasheet - production data Description The ST1S10 is a high efficiency step-down PWM current mode switching regulator capable of providing up to 3 A of output current. The device operates with an input supply range from 2.5 V to 18 V and provides an adjustable output voltage from 0.8 V (VFB) to 0.85 * VIN_SW [VOUT = VFB * (1 + R1/R2)]. It operates either at a 900 kHz fixed frequency or can be synchronized to an external clock (from 400 kHz to 1.2 MHz). The high switching frequency allows the use of tiny SMD external components, while the integrated synchronous rectifier eliminates the need for a Schottky diode. The ST1S10 provides excellent transient response, and is fully protected against thermal overheating, switching overcurrent and output short-circuit. The ST1S10 is the ideal choice for point of load regulators or LDO pre-regulation. Table 1. Device summary Order code Part number DFN8 (4x4 mm) PowerSO-8 ST1S10 ST1S10PUR ST1S10PHR February 2020 This is information on a product in full production. DocID13844 Rev 7 1/30 www.st.com Contents Contents ST1S10 1 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5.2 External components selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5.3 Output capacitor (VOUT > 2.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 5.4 Output capacitor (0.8 V < VOUT < 2.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . 12 5.5 Output voltage selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5.6 Inductor (VOUT > 2.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5.7 Inductor (0.8 V < VOUT < 2.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5.8 Function operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5.8.1 Sync operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5.8.2 Inhibit function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5.8.3 OCP (overcurrent protection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5.8.4 SCP (short-circuit protection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5.8.5 SCP and OCP operation with high capacitive load . . . . . . . . . . . . . . . . 14 6 Layout considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Thermal considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 7 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 8 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 9 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 9.1 Power SO-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 9.2 DFN8 (4 x 4) package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 2/30 DocID13844 Rev 7 ST1S10 Contents 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 DocID13844 Rev 7 3/30 30 List of tables List of tables ST1S10 Table 1..


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