APL1581_12 Datasheet, PDF (8/20 Pages) Anpec Electronics Coropration – nullDUAL INPUT LOW DROPOUT REGULATOR

APL1581
Typical Application Circuit
(1) Adjustable Output Voltage Device
VIN
+3.3V
VCNTL
+5V
CCNTL
10µF
GND
VIN
VOUT
APL1581
(Adj.)
VCNTL VSENSE
ADJ
R1
VREF ₁₂₀
CIN
100µF
R2
120
VOUT
+2.5V/5A
COUT
470µF
GND
* V_OUT = V_REF ( 1+ R2 / R1 ) + I_ADJ x R2
where V_REF =1.25V (typical)
I_ADJ=50µA (typical)
* R1 is typically in range of 100Ω to 125Ω to satisfy the minimum load current requirement.
(2) Fixed Output Voltage Device
VIN
+3.3V
VCNTL
+5V
CCNTL
10µF
VIN
VOUT
APL1581-25
VCNTL VSENSE
GND
CIN
100µF
VOUT
+2.5V/5A
COUT
470µF
GND
GND
(3) With Enable Control Application
VIN
+3.3V
VCNTL
+5V
Enable
GND
Q1
10k
Q2
10k
CCNTL
10µF
VIN
VOUT
APL1581
(Adj.)
VCNTL VSENSE
ADJ
R1
VREF ₁₂₀
CIN
100µF
R2
120
Q1 : APM2301A
Q2 : APM2300A
VOUT
+2.5V/5A
COUT
470µF
GND
Copyright © ANPEC Electronics Corp.
8
Rev. B.8 - Jan., 2012
www.anpec.com.tw