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S1172 Datasheet, PDF (1/35 Pages) Seiko Instruments Inc – HIGH RIPPLE-REJECTION LOW DROPOUT
S-1172 Series
www.sii-ic.com
© Seiko Instruments Inc., 2007-2015
HIGH RIPPLE-REJECTION LOW DROPOUT
HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.2.2_01
The S-1172 Series, developed by using CMOS technology, is a positive voltage regulator with a super low dropout voltage,
high-accuracy output voltage and low current consumption.
The S-1172 Series provides the very low dropout voltage and the large output current due to the built-in transistor with low
on-resistance. The S-1172 Series includes an overcurrent protection circuit that prevents the load current from exceeding
the current capacitance of the output transistor, a thermal shutdown circuit that prevents damage due to overheating, and
an inrush current limit circuit to limit the excessive inrush current generated at power-on.
The ON/OFF circuit ensures longer battery life. Compared with the voltage regulators using the conventional CMOS
technology, a large variety of capacitors are available, including small ceramic capacitors.
High heat radiation HSOP-6 and small SOT-89-5 packages realize high-density mounting.
 Features
• Output voltage:
• Input voltage:
• Output voltage accuracy:
• Dropout voltage:
• Current consumption:
• Output current:
• Input and output capacitors:
• Ripple rejection:
• Built-in overcurrent protection circuit:
• Built-in thermal shutdown circuit:
• Built-in inrush current limit circuit:
• Built-in ON/OFF circuit:
• Operation temperature range:
• Lead-free, Sn 100%, halogen-free*2
1.0 V to 5.0 V, selectable in 0.05 V step
1.5 V to 5.5 V
±1.0% (1.0 V to 1.45 V output product: ±15 mV)
70 mV typ. (3.0 V output product, IOUT = 300 mA)
During operation: 70 μA typ., 90 μA max. (3.0 V output product)
During power-off: 0.1 μA typ., 1.0 μA max.
Possible to output 1000 mA (3.0 V output product, VIN ≥ VOUT(S) + 1.0 V)*1
A ceramic capacitor of 4.7 μF or more can be used.
70 dB typ. (1.0 V output product, f = 1.0 kHz)
Limits overcurrent of output transistor.
Prevents damage caused by heat.
Limits excessive inrush current at power-on.
Ensures Long battery life.
Ta = −40°C to +85°C
*1. Attention should be paid to the power dissipation of the package when the output current is large.
*2. Refer to “ Product Name Structure” for details.
 Applications
• Constant-voltage power supply for battery-powered device
• Constant-voltage power supply for TV, notebook PC and home electric appliance
• Constant-voltage power supply for portable equipment
 Packages
• SOT-89-5
• HSOP-6
Seiko Instruments Inc.
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