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reference designS-85M1A

Ablic S-85M1A

5.6 V INPUT, 200 mA, LOW EMI, SYNCHRONOUS STEP-DOWN SWITCHING REGULATOR WITH 260 nA QUIESCENT CURRENT

Overview

TopologyBuck Converter
Input voltage2.2-4.2 V
Output 13.9 V / 0.2 A
Output 22.5 V / 0.2 A

Description

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 step2.6 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: 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

Typical applications

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

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