S85S1P Datasheet, PDF (1/38 Pages) Seiko Instruments Inc – POWER MONITORING OUTPUT, 5.5 V INPUT, 200 mA SYNCHRONOUS STEP-DOWN SWITCHING REGULATOR WITH 260 nA QUIESCENT CURRENT

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
Rev.1.3_00
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
that divides the input voltage (V_IN) of the DC-DC converter into V_IN/2 or V_IN/3 and outputs the voltage. For example, this
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
DC-DC converter block
• 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
 Applications
• Wearable device
• Bluetooth device
• Wireless sensor network device
• Healthcare equipment
• Smart meter
• Portable game device
 Package
• SNT-8A
( 2.46 mm × 1.97 mm × t0.5 mm max.)
Power monitor block
• Low current consumption:
• Input voltage:
• Output voltage:
Overall
• Operation temperature range:
• Lead-free (Sn 100%), halogen-free
280 nA typ.
1.5 V to 5.5 V
V_IN/2 (S-85S1PCxx)
V_IN/3 (S-85S1PDxx)
Ta = −40°C to +85°C
 Typical Application Circuit
VIN
CIN
10 F
VIN
PVSS
L
2.2 H
SW
VOUT
VOUT
COUT
10 F
EN
PMEN
PMOUT
VSS
CPM
0.22 F
 Efficiency
100
80
60
40
20
0
0.01
V_OUT(S) = 1.8 V
VIN = 2.5 V
VIN = 3.6 V
VIN = 4.2 V
0.1 1 10 100 1000
IOUT [mA]
1