AMS421 View Datasheet(PDF) - Advanced Monolithic Systems Inc
Part Name
Description
MFG CO.
'AMS421' PDF : 7 Pages View PDF
TYPICAL APPLICATIONS
1.5V ≤ VCC ≤ 15V
0.1µF
1
Ref
4
+
-
0.5V
2
1.5V to 15V
10K
5
VO
1.000V
0.47µF
100K
100K
500 pF
LOW NOISE PRECISSION 1.000V REFERENCE
AMS421
2.5V ≤ VCC ≤ 15V
0.1µ
1
4
+
-
0.5V
2
Q1
VO
R3
5
R1
0.47µF
Co
R2
GND
Low cost LDO using an External PNP
Set the VOUT according to the following equation:
VOUT = VREF⎜⎛1 + R1 ⎟⎞ + IREFR1
⎝ R2 ⎠
Maximum output current is (PNP Hfe)10mA. The transistor current rating and package depends of the application dropout.
The power dissipation for the PNP transistor is Iout (Vin-Vout). The package type should be selected according to the Power
dissipation.
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723
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