STEVAL-ISA043V1 1.5 A /1.2 V high frequency synchronous buck converter demonstration board based on the ST1S06 Data brief Features Adjustable current-mode pulse width modulation (PWM) synchronous, step-down DC-DC converter with inhibit function Input voltage, Vin: 2.5 V to 5.5 V Output voltage, Vout: 1.2 V Output current, Iout: 1.5 A Switching frequency: 1.5 MHz RoHS compliant Description STEVAL-ISA043V1 This demonstration board, based on the ST1S06, is an adjustable current-mode PWM synchronous, capacitors results in a low, predictable output step-down DC-DC converter with inhibit function. ripple. To clamp the error amplifier reference It is optimized for powering all low-voltage voltage, this device includes a soft-start control applications and, more generally, to replace the block generating a voltage ramp. high-current linear solution when the power dissipation may cause overheating of the The ST1S06 is available in a 6L-DFN 3x3 application environment. package. It provides up to 1.5 A over an input voltage range of 2.5 V to 5.5 V. A high switching frequency (1.5 MHz) enables the use of tiny surface-mounted components (SMD). In addition to the resistor divider used to set the output voltage value, only an inductor and two capacitors are required. Moreover, low output ripple is guaranteed by the current-mode PWM topology and by the use of low series resistance (ESR) SMD ceramic capacitors. The device is thermal protected and current limited to prevent damage due to accidental short- circuits. It is a complete 1.5 A switching regulator with its internal compensation eliminating the need for additional components. The constant-frequency, current-mode, PWM architecture and stable operation with ceramic November 2010 Doc ID 18210 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4 Obsolete Product(s) - Obsolete Product(s) Circuit schematic STEVAL-ISA043V1 1 Circuit schematic Figure 1. Circuit schematic 6I N 6) . 6) . 3 7 , 34 3 ( ). ( 37 6O UT 6 . 6& 2 + & 2 & + 2/4 Doc ID 18210 Rev 1 Obsolete Product(s) - Obsolete Product(s)