AMC7580 Datasheet, PDF (8/12 Pages) List of Unclassifed Manufacturers – 7A LOW DROPOUT REGULATOR

AMC DOC. #: AMC7580_E (LF)
Feb 2005
AMC7580
7A LOW DROPOUT REGULATOR
ESR
Effects
ESL
Effects
Capacitance
Effects
Slope, V/t = ∆I/C
Point at which regulator
takes control
Figure 4.
Output Voltage
The AMC7580-ADJ develops a 1.25V reference voltage between the Sense pin and the Adjust pin (Figure 5).
Placing a resistor between these two terminals causes a constant current to flow thought R1 and down though R2 to
set the output voltage. In general R1 is chosen so that this current is the specified minimum load current of 10 mA.
The current out of the Adjust pin is small, typically 50µA and it adds to the current for R1. For best regulation the
top of the resistor divider should be connected directly to the Sense pin.
VPOWER
VCONTROL
AMC7580
-ADJ
ADJ
SENSE
VREF _R1
VOUT
VPOWER
IADJ = 50µA
R2
VCONTROL
D1
D2
AMC7580
-ADJ
ADJ
SENSE
R1
R2
Figure 5 Setting Output Voltage
Figure 6. Optional Clamp Diodes Protect
Against Input Crowbar Circuit
Copyright © 2002, ADD Microtech Corp.
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