ABLIC S-85S1AB12-I6T1U

The S-85S1A Series introduces own distinctive low power consumption control and COT (Constant On-Time) control and features ultra low current consumption and fast transient response. PWM / PFM switching control automatically switches to PFM control when under light load, and the IC operates at ultra low current consumption of 260 nA quiescent current. The S-85S1A Series realizes high efficiency in a wide range of load current consumption and provides strong support for extended period operation of mobile devices and wearable devices which are equipped with compact batteries. The S-85S1A Series can configure a step-down regulator only with a coil, an input capacitor, and an output capacitor. By using external parts recommended in this datasheet, the occupancy area can be reduced to 2.0 mm×4.5 mm = 9.0 mm² and it contributes to miniaturization of electronic equipment.

• Ultra low current consumption: 260 nA quiescent current
• Efficiency (when under 100 μA load): 90.5%
• Fast transient response: COT control
• Input voltage: 2.2 V to 5.5 V
• Output voltage: 0.7 V to 2.5 V in 0.05 V step, 2.6 V to 3.9 V in 0.1 V step
• Output voltage accuracy: ±1.5% (1.0 V ≤ VOUT ≤ 3.9 V), ±15 mV (0.7 V ≤ VOUT < 1.0 V)
• Switching frequency: 1.0 MHz (at PWM operation)
• High side power MOS FET on-resistance: 420 mΩ
• Low side power MOS FET on-resistance: 320 mΩ
• Soft-start function: 1 ms typ.
• Under voltage lockout function (UVLO): 1.8 V typ. (detection voltage)
• Thermal shutdown function: 135 °C typ. (detection temperature)
• Overcurrent protection function: 450 mA (at L = 2.2 μH)
• Automatic recovery type short-circuit protection function: Hiccup control
• Input and output capacitors: Ceramic capacitor compatible
• Operation temperature range: Ta = -40 °C to +85 °C
• Lead-free (Sn 100%), halogen-free

• Wearable device
• Bluetooth device
• Wireless sensor network device
• Healthcare equipment
• Smart meter
• Portable game device