S-T111B18MC-OGDTFG Seiko Instruments, S-T111B18MC-OGDTFG Datasheet - Page 11

• Manufacturer Part Number: S-T111B18MC-OGDTFG
• Description: IC REG LDO 150MA 1.8V SOT23-5
• Manufacturer: Seiko Instruments

Specifications of S-T111B18MC-OGDTFG

• Regulator Topology: Positive Fixed
• Voltage - Output: 1.8V
• Voltage - Input: Up to 6.5V
• Voltage - Dropout (typical): 0.28V @ 100mA
• Number Of Regulators: 1
• Current - Output: 150mA (Min)
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Number Of Outputs: 1
• Polarity: Positive
• Input Voltage Max: 6.5 V
• Output Voltage: 1.8 V
• Output Type: Fixed
• Dropout Voltage (max): 0.47 V at 100 mA
• Output Current: 150 mA
• Line Regulation: 0.2 % / V
• Load Regulation: 40 mV
• Voltage Regulation Accuracy: 1 %
• Maximum Power Dissipation: 0.3 W
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Rev.3.0
Operation
2. Output transistor
1. Basic operation
Figure 11 shows the block diagram of the S-T111 Series.
The error amplifier compares the reference voltage (V
divided by feedback resistors R
to ensure a certain output voltage free of any fluctuations of input voltage and temperature.
The S-T111 Series uses a low on-resistance P-channel MOS FET as the output transistor.
Be sure that V
to inverse current flowing from the VOUT pin through a parasitic diode to the VIN pin.
_00
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
OUT
does not exceed V
*1.
VSS
VIN
Current
supply
Reference voltage
V
Parasitic diode
ref
s
circuit
and R
IN
Seiko Instruments Inc.
+ 0.3 V to prevent the voltage regulator from being damaged due
f
. It supplies the output transistor with the gate voltage necessary
−
+
amplifier
Error
Figure 11
ref
) with V
R
R
s
f
fb
V
, which is the output voltage resistance-
*1
fb
VOUT
S-T111 Series
11