S-818A33AUC-BGN-T2 Seiko Instruments, S-818A33AUC-BGN-T2 Datasheet - Page 7

• Manufacturer Part Number: S-818A33AUC-BGN-T2
• Description: Low Dropout (LDO) Regulators 3.3V 30uA 2.0%
• Manufacturer: Seiko Instruments

Specifications of S-818A33AUC-BGN-T2

• Number Of Outputs: 1
• Polarity: Positive
• Input Voltage Max: 10 V
• Output Voltage: 3.3 V
• Output Type: Fixed
• Dropout Voltage (max): 0.44 V at 60 mA
• Output Current: 0.2 A
• Line Regulation: 0.2 % / V
• Load Regulation: 50 mV
• Voltage Regulation Accuracy: 2 %
• Maximum Power Dissipation: 500 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOT-89
• Minimum Operating Temperature: - 40 C
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Rev.1.2
„ Operation
1. Basic operation
2. Output transistor
3. Power Off Pin (ON/OFF Pin)
Figure 7 shows the block diagram of the S-818
Series.
The error amplifier compares a reference voltage
V
feedback resistors Rs and Rf. It supplies the output
transistor with the gate voltage, necessary to ensure
certain output voltage free of any fluctuations of input
voltage and temperature.
The S-818 Series uses a low on-resistance Pch MOS FET as the output transistor.
Be sure that V
inverse current flowing from V
This pin activates and inactivates the regulator.
When the ON/OFF pin is switched to the power off level, the operation of all internal circuit stops, the built-in
Pch MOSFET output transistor between V
The V
V
The structure of the ON/OFF pin is shown in Figure 8. Since the ON/OFF pin is neither pulled down nor pulled
up internally, do not keep it in the floating state. Current consumption increases if a voltage of 0.3 V to V
V is applied to the ON/OFF pin. When the power off pin is not used, connect it to the V
"A" and to the V
REF
SS
Product
pin.
with the part of the output voltage divided by the
type
OUT
A
A
B
B
Table 6 Power off pin function by product type
pin goes to the Vss level due to internal divided resistance of several M
OUT
SS
“H” : Power on
“H” : Power off
“L” : Power off
“L” : Power on
ON/OFF pin
pin for product type "B".
does not exceed V
OUT
pin to V
Operating
Operating
Internal
circuit
Stop
Stop
IN
Seiko Instruments Inc.
+0.3 V to prevent the voltage regulator from being broken due to
IN
IN
pin through the parasitic diode.
and V
LOW DROPOUT CMOS VOLTAGE REGULATOR
OUT
VOUT pin
Set value
V
V
Set value
voltage
SS
SS
pin is switched off, suppressing current consumption.
level
level
Current
source
VSS
VIN
Vref
Reference
voltage
circuit
Figure 7 Typical Circuit Block Diagram
consumption
Current
Iss1
Iss2
Iss2
Iss1
Error amplifier
*1 Parasitic diode
Figure 8 ON/OFF Pin
between V
IN
ON/OFF
Rf
Rs
pin for product type
S-818 Series
VSS
OUT
*1
VIN
pin and
IN
VOUT
-0.3
7