LMS1587_15 datasheet(6/14 Pages) TI

Part #	LMS1587

Description	LMS1585A 5A/LMS1587 5A and 3A Low Dropout Fast Response Regulators

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Manufacturer	TI [Texas Instruments]

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VOUT

VIN

I1

10 µF

VREF

10 µF

R1

R2

IADJ

VIN

VOUT

ADJ

VOUT = VREF (1 + R2) + IADJR2

R2

R1

LMS1585A , LMS1587

SNVS061G – MONTH 2003 – REVISED JULY 2013

www.ti.com

APPLICATION NOTE

OUTPUT VOLTAGE

The adjustable version develops at 1.25V reference voltage, (VREF), between the output and the adjust terminal.

As shown in Figure 3, this voltage is applied across resistor R1 to generate a constant current I1. This constant

current then flows through R2. The resulting voltage drop across R2 adds to the reference voltage to sets the

desired output voltage.

The current IADJ from the adjustment terminal introduces an output error. But since it is small (120μA max), it

becomes negligible when R1 is in the 100

Ω range.

For fixed voltage devices, R1 and R2 are integrated inside the devices.

Figure 3. Basic Adjustable Regulator

6

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