S85S1A Datasheet, PDF (1/30 Pages) Seiko Instruments Inc – 5.5 V INPUT, 200 mA SYNCHRONOUS STEP-DOWN SWITCHING REGULATOR WITH 260 nA QUIESCENT CURRENT

S-85S1A Series
5.5 V INPUT, 200 mA SYNCHRONOUS STEP-DOWN
www.sii-ic.com
SWITCHING REGULATOR WITH 260 nA QUIESCENT CURRENT
© SII Semiconductor Corporation, 2017
Rev.1.2_00
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.
 Features
 Applications
• 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 ≤ 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:
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 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
• Wearable device
• Bluetooth device
• Wireless sensor network device
• Healthcare equipment
• Smart meter
• Portable game device
 Package
• SNT-6A
(1.80 mm × 1.57 mm × t0.5 mm max.)
 Typical Application Circuit
VIN
CIN
10 F
VIN
PVSS
L
2.2 H
SW
VOUT
EN
VSS
VOUT
COUT
10 F
 Efficiency
V_OUT(S) = 1.8 V
100
80
VIN = 2.5 V
60
VIN = 3.6 V
40
VIN = 4.2 V
20
0
0.01 0.1
1 10 100 1000
IOUT [mA]
1