ST1S10PHR

The ST1S10 is a high efficiency step-down PWM current mode switching regulator capable of delivering up to 3 A of output current. The device operates with an adjustable output voltage from 0.8 V (VFB) to 0.85*VIN [VOUT = VFB*(1+R1/R2)]. It operates at either 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, thermal protection, switching over-current and output short circuit protection. The ST1S10 is a high efficiency step-down DC-DC converter with inhibit function. It provides up to 3 A over an input voltage range of 2.5 V to 18 V, and the output voltage can be adjusted from 0.8 V. A high internal switching frequency (0.9 MHz) allows the use of tiny surface-mount components, and only an inductor and 2 capacitors are required for proper operation. The device can operate in PWM mode with a fixed frequency or synchronized to an external frequency through the SYNC pin. Using ceramic capacitors results in low, predictable output ripple. No external compensation is needed. The ST1S10 is equipped with thermal shut down protection activated at 150°C (typ.). Cycle-by-cycle short circuit protection provides protection against short circuits.

Applications

• Consumer: STB, DVD players, audio, LCD monitors
• Networking: XDSL, modems, DC-DC modules
• Computer: Optical storage, HDD, audio/graphic cards
• Industrial and security: PGA, LED drivers

Key features

• 0.8 V reference
• 2.5 V to 18 V input voltage range
• 2% output voltage accuracy
• Synchronizable
• Soft-start
• 90% duty cycle
• Typical quiescent current: 6 μA
• 3 A output current
• Stand-by supply current: max 10 μA
• Operating junction temperature range: -25°C to 125°C