S-1172B33-E6T1G Seiko Instruments, S-1172B33-E6T1G Datasheet - Page 14

• Manufacturer Part Number: S-1172B33-E6T1G
• Description: Low Dropout (LDO) Regulators Linear LDO reg Hi 70uA Iq 1000mA Iout
• Manufacturer: Seiko Instruments

Specifications of S-1172B33-E6T1G

• Polarity: Positive
• Input Voltage Max: 6 V
• Output Voltage: 3.3 V
• Output Type: Fixed
• Dropout Voltage (max): 3 V at 300 mA
• Output Current: 1000 mA
• Load Regulation: 15 mV
• Voltage Regulation Accuracy: 1 %
• Maximum Power Dissipation: 1900 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: HSOP-6
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

14
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1172 Series
Operation
1. Basic operation
2. Output transistor
Figure 13 shows the block diagram of the S-1172 Series.
The error amplifier compares the reference voltage (V
feedback resistors R
is not influenced by the input voltage and temperature change, to the output transistor.
In the S-1172 Series, a low on-resistance P-channel MOS FET is used as the output transistor.
Be sure that V
current which flows, because of a parasitic diode between the VIN and VOUT pin, when the potential of V
became higher than V
OUT
VIN
VSS
*1. Parasitic diode
does not exceed V
Current
s
supply
Reference voltage
IN
and R
.
V
ref
circuit
f
. It supplies the gate voltage necessary to maintain the constant output voltage which
IN
Error amplifier
+ 0.3 V to prevent the voltage regulator from being damaged due to inverse
−
+
Seiko Instruments Inc.
Figure 13
ref
) with V
fb
, which is the output voltage resistance-divided by
V
R
R
fb
f
s
*1
VOUT
Rev.2.0
_00
OUT