S-85S1P Series

www.sii-ic.com

POWER MONITORING OUTPUT,

5.5 V INPUT, 200 mA SYNCHRONOUS STEP-DOWN

SWITCHING REGULATOR WITH 260 nA QUIESCENT CURRENT

© SII Semiconductor Corporation, 2017

1

The S-85S1P 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-85S1P 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 function of the power monitoring output is prepared in the S-85S1P Series. The power monitoring output is a function

function makes it possible that the IC connects to a low voltage microcontroller A/D converter directly and the

microcontroller monitors a battery voltage.



Features



Applications

DC-DC converter block

• Wearable device

• Ultra low current consumption:

260 nA quiescent current

• Bluetooth device

• Efficiency (when under 100 μA load):

90.5%

• Wireless sensor network device

• Fast transient response:

COT control

• Healthcare equipment

• Input voltage:

2.2 V to 5.5 V

• Smart meter

• Output voltage:

0.7 V to 2.5 V, in 0.05 V step

• Portable game device

2.6 V to 3.9 V, in 0.1 V step

• Output voltage accuracy:

±1.5% (1.0 V



Package

• SNT-8A

( 2.46 mm

× 1.97 mm × t0.5 mm max.)

±15 mV (0.7 V

• Switching frequency:

1.0 MHz (at PWM operation)

• High side power MOS FET on-resistance:

420 m

Ω

• Low side power MOS FET on-resistance:

320 m

Ω

• 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

Power monitor block

• Low current consumption:

280 nA typ.

• Input voltage:

1.5 V to 5.5 V

• Output voltage:

Overall

• Operation temperature range:

Ta =

−40°C to +85°C

• Lead-free (Sn 100%), halogen-free



Typical Application Circuit

VSS

VIN

10

F

PVSS

VOUT

EN

PMEN

SW

PMOUT

10

F

L

2.2

H

0.22

F



Efficiency

0.1

1

10

0.01

1000

100

0

100

80

60

40

20