MAX8515AEZK-T View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX8515AEZK-T

Wide-Input 0.6V Shunt Regulators for Isolated DC-to-DC Converters

Maxim Integrated 

Wide-Input 0.6V Shunt Regulators for

Isolated DC-to-DC Converters

Typical Operating Characteristics (continued)

(VIN = 3.3V, IOUT = 5mA, FB = OUT, circuit in Figure 1, C1 = 0.1µF, C2 = 1µF, TA = +25°C, unless otherwise specified.)

OUTPUT VOLTAGE CHANGE

vs. LOAD CURRENT

0.6

0.5

0.4

0.3

0.2

0.1

0

-0.1

-0.2

-0.3

0

5

10

15

20

LOAD CURRENT (mA)

OUTPUT VOLTAGE CHANGE

vs. INPUT VOLTAGE

0.05

0.04

0.03

0.02

0.01

0

-0.01

3

8

13

18

23

28

INPUT VOLTAGE (V)

Pin Description

PIN

NAME

FUNCTION

1

PGND

Power Ground. Connect PGND and GND together.

2

GND

Analog Ground. Connect GND and PGND together.

3

OUT

Output. Connect a ceramic capacitor from OUT to GND. See the Applications Information section.

4

IN

Supply Input. Connect a 0.1µF capacitor to GND.

5

FB

Feedback Input. Regulates to 600mV.

Detailed Description

The MAX8515A/MAX8515 adjustable shunt regulators

feature isolated supply inputs and outputs, ideal for isolat-

ed power-supply applications using an optocoupler in the

feedback path. The MAX8515A/MAX8515 sink 20mA with

VOUT at 0.2V. The wide input supply range allows the

device to operate from 1.7V to 28V. The MAX8515A/

MAX8515 compare the FB input to a precision 600mV

reference. If the FB input is low, OUT sinks no current. If

FB rises above 600mV, OUT sinks up to 20mA.

Applications Information

Shunt Regulator/Adjustable

Voltage Reference

Figure 1 shows the MAX8515A/MAX8515 configured as a

shunt regulator. Connect FB to OUT for an output voltage

of 0.6V. Connect a 1.0µF capacitor from OUT to GND

when the output voltage is 0.6V. A resistor-divider con-

nected from OUT to GND produces higher output volt-

ages and allows for a smaller output capacitor. The

value of the output capacitor is inversely proportional to

the output voltage:

VOUT

= 0.6

×

1

+

R1

R2 

COUT

= 1µF

×

 0.6 





VOUT





Set the current limit with a resistor connected from IN to

OUT. This type of shunt regulator is limited to low-current

applications. The MAX8515A/MAX8515 can typically sink

up to 20mA in this application.

Figure 2 shows the test circuits for gain and phase plots.

4 _______________________________________________________________________________________

Share Link: