S-1206B18-M3T1G Seiko Instruments, S-1206B18-M3T1G Datasheet - Page 12

• Manufacturer Part Number: S-1206B18-M3T1G
• Description: IC, LDO VOLT REG, 1.8V, 250mA, 3-SOT-23
• Manufacturer: Seiko Instruments

Specifications of S-1206B18-M3T1G

• Primary Input Voltage: 6.5V
• Output Voltage Fixed: 1.8V
• Dropout Voltage Vdo: 150mV
• No. Of Pins: 3
• Output Current: 250mA
• Operating Temperature Range: -40°C To +85°C
• Output Voltage: 5.2V
• Polarity: Positive
• Input Voltage Max: 7 V
• Output Type: Fixed
• Dropout Voltage (max): 3 V at 100 mA
• Load Regulation: 20 mV
• Voltage Regulation Accuracy: 1 %
• Maximum Power Dissipation: 430 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOT-23
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

12
ULTRA LOW CURRENT CONSUMPTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1206 Series
Operation
1. Basic Operation
2. Output Transistor
3. Overcurrent protector
Figure 11 shows the block diagram of the S-1206 Series.
The error amplifier compares the reference voltage (V
feedback resistors R
output voltage free of any fluctuations of input voltage and temperature.
The S-1206 Series uses a low-on-resistance P-channel MOS FET as the output transistor.
Be sure that V
from the VOUT pin through a parasitic diode to the VIN pin.
The S-1206 Series has an overcurrent protection circuit having the characteristics shown in “(1) Output Voltage vs.
Output Current (Ta = 25°C)” in “
an excessive output current and short circuiting between the VOUT and VSS pins. The current (I
output pin is short-circuited is internally set at approx. 130 mA (typ.) (1.2 V ≤ V
V ≤ V
Caution Using the overcurrent protection circuit is to protect the output transistor from accidental
OUT
< 5.2 V), and the normal value is restored for the output voltage, if releasing a short circuit once.
conditions such as short circuited load and the rapid and large current flow in the large capacitor.
The overcurrent protection circuit is not suitable for use under the short circuit status or large
current flowing (150 mA or more (1.2 V ≤ V
long.
OUT
current supply
*1. Parasitic diode
does not exceed V
VIN
VSS
Constant
s
and R
Reference voltage
V
f
. It supplies the output transistor with the gate voltage necessary to ensure a certain
ref
circuit
Characteristics (Typical Data)”, in order to protect the output transistor against
IN
+ 0.3 V to prevent the IC from being damaged due to inverse current flowing
Error amplifier
Seiko Instruments Inc.
−
+
Figure 11
ref
OUT(S)
) with V
< 1.5 V), or 250 mA or more (1.5 V ≤ V
fb
, which is the output voltage resistance-divided by
V
OUT
R
R
fb
f
s
< 2.3 V) or approx. 100 mA (typ.) (2.3
*1
VOUT
SHORT
OUT(S)
Rev.3.0
) when the
)) that last
_00