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ST1S12XX：Synchronous rectification with inhibit, 0.7 A, 1.7 MHz adjustable, step-down switching regulator

The ST1S12 is a step down DC-DC converter optimized for powering low-voltage digital cores in HDD applications and, generally, to replace the high current linear solution when the power dissipation may cause high heating of the application environment. It provides up to 0.7 A over an input voltage range of 2.5 V to 5.5 V. A high switching frequency (1.7 MHz) allows the use of tiny surface-mount components. In addition to the resistor divider to set the output voltage value, only an inductor and two capacitors are required. Moreover, a low output ripple is guaranteed by the current mode PWM topology and by the use of low ESR SMD ceramic capacitors. The device is thermally protected and the current is limited to prevent damage due to accidental short-circuit. The ST1S12 is available in the TSOT23-5L package.

Key Features

• Step-down current mode PWM (1.7 MHz) DC-DC converter
• 3% DC output voltage tolerance
• Synchronous rectification
• Fixed output voltage 1.2 V, 1.8 V, and ADJ (available on request 1.5 V, 2.5 V and 3.3 V)
• Enable function
• Internal soft start
• Typical efficiency: > 90%
• 0.7 A output current capability
• Not switching quiescent current: max 650 μA over temperature range
• RDSON typ. 250 mΩ and 400 mΩ
• Uses tiny capacitors and inductors
• Operative junction temp. -40 °C to 125 °C
• Available in TSOT23-5L package

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