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S-85S0AB34-I6T1U Datasheet(PDF) 9 Page - Seiko Instruments Inc

Part # S-85S0AB34-I6T1U
Description  5.5 V INPUT, 50 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-85S0AB34-I6T1U Datasheet(HTML) 9 Page - Seiko Instruments Inc

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5.5 V INPUT, 50 mA SYNCHRONOUS STEP-DOWN SWITCHING REGULATOR WITH 260 nA QUIESCENT CURRENT
Rev.1.0_00
S-85S0A Series
9
5. Under voltage lockout function (UVLO)
The S-85S0A Series has a built-in UVLO circuit to prevent the IC from malfunctioning due to a transient status at
power-on or a momentary drop in the supply voltage. When UVLO status is detected, the high side power MOS FET
and low side power MOS FET will turn off, and the SW pin will change to "High-Z". For this reason, switching
operation will stop. The soft-start function is reset if UVLO status is detected once, and is restarted by releasing the
UVLO status.
Note that the other internal circuits operate normally and the status is different from the disabled status.
Also, there is a hysteresis width for avoiding malfunctions due to generation of noise etc. in the input voltage.
6. Thermal shutdown function
The S-85S0A Series has a built-in thermal shutdown circuit to limit overheating. When the junction temperature
increases to 135°C typ., the thermal shutdown circuit becomes the detection status, and the switching operation is
stopped. When the junction temperature decreases to 115°C typ., the thermal shutdown circuit becomes the release
status, and the switching operation is restarted.
If the thermal shutdown circuit becomes the detection status due to self-heating, the switching operation is stopped
and output voltage (VOUT) decreases. For this reason, the self-heating is limited and the temperature of the IC
decreases. The thermal shutdown circuit becomes release status when the temperature of the IC decreases, and
the switching operation is restarted, thus the self-heating is generated again. Repeating this procedure makes the
waveform of VOUT into a pulse-like form. Switching operation stopping and starting can be stopped by either setting
the EN pin to "L", lowering the output current (IOUT) to reduce internal power consumption, or decreasing the ambient
temperature.
Table 8
Thermal Shutdown Circuit
VOUT Pin Voltage
Release: 115
°C typ.
*1
VOUT
Detection: 135
°C typ.
*1
"High-Z"
*1. Junction temperature
7. Overcurrent protection function
The S-85S0A Series has a built-in current limit circuit.
The overcurrent protection circuit monitors the current that flows through the low side power MOS FET and limits
current to prevent thermal destruction of the IC due to an overload, magnetic saturation in the inductor, etc.
When a current exceeding the current limit (ILIM) flows through the low side power MOS FET, the current limit circuit
operates and prohibits turning on the high side power MOS FET until the current falls below the low side current limit
(ILIMDET). If the value of the current that flows through the low side power MOS FET falls to the ILIMDET or lower, the
S-85S0A Series returns to normal operation. ILIMDET is fixed at 120 mA typ. in the IC, and ILIM will vary depending on
the external parts to be used.
The relation between ILIM, the inductor value (L), the input voltage (VIN), and the output voltage (VOUT) are shown in
the following expression.
ILIM = ILIMDET
+
1
2
× L × fSW ×
(VIN
− VOUT) × VOUT
VIN


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