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S-85S1AB30-I6T1U Datasheet(PDF) 8 Page - Seiko Instruments Inc

Part # S-85S1AB30-I6T1U
Description  5.5 V INPUT, 200 mA SYNCHRONOUS STEP-DOWN SWITCHING REGULATOR WITH 260 nA QUIESCENT CURRENT
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Manufacturer  SII [Seiko Instruments Inc]
Direct Link  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

S-85S1AB30-I6T1U Datasheet(HTML) 8 Page - Seiko Instruments Inc

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5.5 V INPUT, 200 mA SYNCHRONOUS STEP-DOWN SWITCHING REGULATOR WITH 260 nA QUIESCENT CURRENT
S-85S1A Series
Rev.1.2_00
8
Operation
1. Fast transient response
Distinctive COT (Constant On-Time) control is used for DC-DC converter control.
The S-85S1A Series monitors the output voltage (VOUT) using a comparator and if VOUT falls below the targeted
value, the high side power MOS FET will turn on for a certain amount of time. Since the high side power MOS FET
turns on and VOUT rises immediately after the load current fluctuates rapidly and VOUT falls, the fast transient
response is realized.
The S-85S1A Series outputs ON time in proportion to VOUT and in inverse proportion to power supply voltage.
Therefore, when in continuous mode, even if the power supply voltage or VOUT settings would change, it always
operates at a quasi-fixed frequency of 1 MHz.
2. PWM / PFM switching control
The S-85S1A Series automatically switches between the pulse width modulation method (PWM) and pulse
frequency modulation method (PFM) according to the load current. If the output current (IOUT) is large, the IC will
operate using PWM control. If IOUT is small, the IC using PFM control, the pulse will skip according to the load
current. This reduces switching loss and improves efficiency when under light load.
The S-85S1A Series has a built-in reverse current detection circuit. The reverse current detection circuit monitors
the current flowing through the inductor. If the bottom of ripple current in the inductor falls to 0 mA, the high side
power MOS FET and low side power MOS FET will turn off and switching operation will stop. Switching frequency
will fall from 1.0 MHz by skipping a pulse. This means that the smaller IOUT is, the more the switching frequency (fSW)
will drop, and it reduces switching loss.
3. Ultra low current consumption
When in discontinuous mode, the S-85S1A Series reduces current consumption to 260 nA typ. by intermittently
operating a control circuit and a protection circuit. When under light load, the high side power MOS FET and low
side power MOS FET will turn off. When switching operation stops and a certain amount of time elapses, only the
necessary circuits will operate.
Under voltage lockout function (UVLO), thermal shutdown function, current limit function, and automatic recovery
type short-circuit protection function are prepared in the S-85S1A Series, and each protection function will carry out
detection operation for a certain amount of time from when the high side power MOS FET turns on under light load.
It is thus able to realize ultra low current consumption. When under heavy load, the IC changes to continuous mode
as a result of the fact that the high side power MOS FET and low side power MOS FET turn on continuously, so all
the IC, including the protection circuits, will operate.
4. EN pin
This pin starts and stops switching operation. When the EN pin is set to "L", the operation of all internal circuits,
including the high side power MOS FET, is stopped, reducing current consumption. Current consumption increases
when a voltage of 0.3 V to VIN
− 0.3 V is applied to the EN pin. When not using the EN pin, connect it to the VIN pin.
Since the EN pin is neither pulled down nor pulled up internally, do not use it in the floating status. The structure of
the EN pin is shown in Figure 3.
Table 7
EN Pin
Internal Circuit
VOUT Pin Voltage
"H"
Enable (normal operation)
VOUT
*2
"L"
Disable (standby)
"High-Z"
*1. Refer to *2 in Table 6 in " Electrical Characteristics".
VIN
VSS
EN
Figure 3


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