ST1S12XX18中文资料Synchronous rectification with inhibit, 0.7 A, 1.7 MHz adjustable, step-down switching regulator数据手册ST规格书

描述 Description

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.

特性 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
R
DSONtyp. 250 mΩ and 400 mΩ
Uses tiny capacitors and inductors
Operative junction temp. -40 °C to 125 °C
Available in TSOT23-5L package