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PDF S-85S1A Data sheet ( Hoja de datos )
| Número de pieza | S-85S1A | |
| Descripción | 200 mA SYNCHRONOUS STEP-DOWN SWITCHING REGULATOR | |
| Fabricantes | Seiko Instruments | |
| Logotipo |  |
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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.1.1_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 ≤ 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:
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
VOUT(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
IOUT [mA]
100 1000
1
1 page  
5.5 V INPUT, 200 mA SYNCHRONOUS STEP-DOWN SWITCHING REGULATOR WITH 260 nA QUIESCENT CURRENT
Rev.1.1_00
S-85S1A Series
Pin Configuration
1. SNT-6A
Top view
16
25
34
Figure 2
Pin No.
1
2
3
4
5
6
Symbol
VOUT
VSS
SW
PVSS
VIN
EN
Table 3
Description
Voltage output pin
GND pin
External inductor connection pin
Power GND pin
Power supply pin
Enable pin
"H" : Enable (normal operation)
"L" : Disable (standby)
5
5 Page 
5.5 V INPUT, 200 mA SYNCHRONOUS STEP-DOWN SWITCHING REGULATOR WITH 260 nA QUIESCENT CURRENT
Rev.1.1_00
S-85S1A Series
9. Pre-bias compatible soft-start function
The S-85S1A Series has a built-in pre-bias compatible soft-start circuit.
If the pre-bias compatible soft-start circuit starts when electrical charge remains in the output voltage (VOUT) as a
result of power supply restart, etc., or when VOUT is biased beforehand (pre-bias status), switching operation is
stopped until the soft-start voltage exceeds the internal feedback voltage, and then VOUT is maintained. If the
soft-start voltage exceeds the internal feedback voltage, switching operation will restart and VOUT will rise to the
output voltage setting value (VOUT(S)). This allows VOUT(S) to be reached without lowering the pre-biased VOUT.
In soft-start circuits which are not pre-bias compatible, a large current flows as a result of the discharge of the
residual electric charge through the low side power MOS FET when switching operation starts, which could cause
damage, however in a pre-bias compatible soft-start circuit, the IC is protected from the large current when switching
operation starts, and it makes power supply design for the application circuit simpler.
In the S-85S1A Series, VOUT reaches VOUT(S) gradually due to the soft-start circuit.
In the following cases, rush current and VOUT overshoot are reduced.
• At power-on
• When the EN pin changes from "L" to "H".
• When UVLO operation is released.
• When thermal shutdown is released.
• At short-circuit recovery
In addition, the soft-start circuit operates under the following conditions.
The soft-start circuit starts operating after "H" is input to the EN pin and the soft-start wait time (tSSW) = 1.5 ms typ.
elapses. The soft-start time (tSS) is set to 1.0 ms typ.
• At power supply restart (the IC restart)
• At UVLO detection (after UVLO release)
• At thermal shutdown detection (after thermal shutdown release)
• After Hiccup control
Soft-start wait time Soft-start time
(tSSW)
(tSS)
Soft-start operation during pre-bias
VEN
VOUT
VSW
Figure 6
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet S-85S1A.PDF ] | |
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