The S-85M1A 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-85M1A 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.
In addition, WLP-6L package suitable for high-density mounting is adopted, it contributes to miniaturization of electronic equipment. By using external parts recommended in this datasheet, the occupancy area can be reduced to 2.0 mm × 3.3 mm = 6.6 mm².
Since the S-85M1A Series suppressing EMI emission minimally, allows for high efficiency, it is adequate for applications such as wireless communication, GPS and other noise-affected devices.

Features

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 5.6 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 ≤ V_OUT ≤ 3.9 V); ±15 mV (0.7 V ≤ V_OUT < 1.0 V)
Switching frequency: 1.0 MHz (at PWM operation)
High side power MOS FET on-resistance: 360 mΩ
Low side power MOS FET on-resistance: 250 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
Discharge shunt function: Unavailable
(S-85M1A Series B type); Available
(S-85M1A Series C type)
Input and output capacitors: Ceramic capacitor compatible
Operation temperature range: Ta = −40°C to +85°C
Lead-free, halogen-free

Applications

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

Parts List

U(Ux), S and G at the end of the product name of ABLIC Inc. were used to indicate different material specifications as “environmental code”,
however, these have now been unified into “lead-free and halogen-free” and are identical in terms of environmental quality.
Note: Lead-free plating other than 100% Sn is applied to some limited old products, therefore, please contact our sales representatives for details.
These descriptions may be different from the actual product name and parameter.
Please confirm the product name and specifications with the data sheet again.
The information herein is subject to change without notice.