The S-1740/1741 Series, developed using CMOS technology, is a positive voltage regulator with a supply voltage divided output, which features super low current consumption and low dropout voltage.
The regulator block has low current consumption of 0.35 μA typ. and high-accuracy output voltage of ±1.0%.
The function of the supply voltage divided output is prepared in the S-1740/1741 Series. The supply voltage divided output is a function that divides the input voltage (Vin) of the regulator into Vin/2 or Vin/3 and outputs the voltage. For example, this function makes it possible that the IC connects to a low voltage microcontroller A/D converter directly and the microcontroller monitors a battery voltage.
Features
Regulator block
- Output voltage
- Vout = 1.0 V to 3.5 V, selectable in 0.05 V step
- Input voltage
- Vin = 1.5 V to 5.5 V
- Output voltage accuracy
- ±1.0% (1.0 V to 1.45 V output product: ±15 mV) (Ta = +25°C)
- Dropout voltage
- 20 mV typ. (2.5 V output product, at Iout = 10 mA) (Ta = +25°C)
- Current consumption during operation ISS1 = 0.35 μA typ. (Ta = +25°C)
- Output current
- Possible to output 100 mA ( at Vin ≥ VOUT(S) + 1.0 V)*1
- Input capacitor
- A ceramic capacitor can be used. (1.0 μF or more)
- Output capacitor
- A ceramic capacitor can be used. (1.0 μF to 100 μF)
- Built-in overcurrent protection circuit
- Limits overcurrent of output transistor.
Supply voltage divider block
- Output voltage
- Vpmout = Vin/2 (S-1740 Series)
- Vpmout = Vin/3 (S-1741 Series)
- Current consumption during operation
- ISS1P = 0.15 μA typ. (Ta = +25°C)
- Output capacitor
- A ceramic capacitor can be used. (100 nF to 220 nF)
- Built-in enable circuit
- Ensures long battery life.
Overall
- Operation temperature range
- Ta = −40°C to +85°C
- Lead-free (Sn 100%), halogen-free
*1. Please make sure that the loss of the IC will not exceed the power dissipation when the output current is large.
Applications
- Constant-voltage power supply and battery voltage monitoring support for battery-powered device
- Constant-voltage power supply for portable communication device, digital camera, and digital audio player
- Constant-voltage power supply for home electric appliance