5.5 V Input, 200 mA Synchronous Step-down Switching Regulator with 10 μA Quiescent Current S-85V1A Series

The S-85V1A Series is a step-down switching regulator which features high efficiency and fast transient response.
Since PWM / PFM switching control automatically switches to PFM control when under light load, high efficiency is realized.
This IC is suitable for mobile devices and battery powered devices due to introduction of own distinctive COT (Constant On-Time) control.
Also, high-density mounting is realized by adopting super-small, thin SNT-6A package.
Therefore, the occupancy area including a coil, an input capacitor and an output capacitor can be reduced to 2.0 mm × 4.5 mm = 9.0 mm2 , and it contributes to miniaturization of electronic equipment.


Current consumption
10 μA quiescent current
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
450 mΩ
Low side power MOS FET on-resistance
350 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 limit 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


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