HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT
CMOS VOLTAGE REGULATOR
The S-1172 Series, developed based on CMOS technology, is a positive
voltage regulator with a super low dropout voltage, high output voltage
accuracy, and low current consumption.
The S-1172 Series provides the very small dropout voltage and the large
output current due to the built-in transistor with low on-resistance. The
overcurrent protector prevents the load current from exceeding the
capacitance of output transistor. The thermal shutdown circuit prevents
damage caused by heat, the rush current control circuit limits the
excessive rush current during start-up.
The ON/OFF circuit ensures longer battery life. Various capacitors, also
small ceramic capacitors, can be used for this IC more than for the
conventional regulator ICs which have CMOS technology.
The packages, high heat radiation HSOP-6 and small SOT-89-5 enable
• Output voltage :
• Low equivalent series resistance capacitor :
• Input voltage :
• High-accuracy output voltage :
• Low dropout voltage :
• Low current consumption :
• Output current :
• High ripple rejection :
• Built-in overcurrent protection circuit :
• Built-in thermal shutdown circuit :
• Built-in rush current control circuit :
• Built-in power on/off circuit :
• Small package :
• Lead-free product
1.0 to 5.0 V, selectable in 0.05 V step.
Ceramic capacitor of 4.7 µF or more can be used as the
1.5 to 5.5 V
±1.0% (1.0 to 1.45 V output product : ±15 mV)
70 mV typ. (3.0 V output product, at IOUT = 300 mA)
During operation : 70 µA typ., 90 µA max.
(3.0 V output product)
During shutdown : 0.1 µA typ., 1.0 µA max.
1000 mA (3.0 V output product, at VIN ≥ VOUT(S) + 1.0 V)*1
70 dB typ. (at 1.0 kHz, VOUT = 1.0 V)
limits overcurrent of output transistor
prevents damage caused by heat
limits excessive rush current during start-up
Longer battery life
*1. Attention should be paid to the power dissipation of the package when the output current is large.
• Power supply for battery-powered devices
• Power supply for TV, notebook PCs and home electric appliances
• Constant-voltage power supply for portable equipment
Seiko Instruments Inc.