LGA C Series Data Sheet

Application Equations

5-8

9-10

21

1-4

14

LGA C Series

Enable On/Off

Vin

GND

Rtrim

Cin

R

L

O

A

D

Vout

Cout

24

15

12

13

Rmargin

+Sense

-Sense

Ruvlo

Margin Control

23

Rofs-

Rofs+

22

Power Good

GND

Setting Margin Control

Setting Output Voltage

Setting Under Voltage Lock Out

– 20 A Models

Setting Under Voltage Lock Out

– 3, 6, 10 A Models

To margin the output up, pull the margin control pin high. To

margin down, pull the margin control pin low. If the pin is left

floating, the feature is disabled. The maximum margining range is

±33% of the oputput default voltage setting, with maximum

output at 5.5 V

Vmargin_up = 0.1182 *

Rmargin

*

Rtrim + 2k

Rofs+

Rtrim

Vmargin_down = 0.1182 *

Rmargin

*

Rtrim + 2k

Rofs-

Rtrim

Default output voltage: 0.591 V

The outut voltage may be adjusted with a resistor placed

between the "Trim" and "-Sense" pin.

The formula for calcuating the value of this resistor is:

Rtrim (kΩ) =

1.182

Vout - 0.591

See Technical Reference Note for other trimming methods.

Default Turn-on voltage: 4.3 V (300 mV Hysteresis)

The Turn-on voltage may be adjusted with a resistor placed

between the “Enable” and “Ground” pins.

The formula for calculating the value of this resistor is:

Ruvlo (kΩ) =

30.1 * 4.22

(8.577 * VTurn_on) - 34.32

*ONLY USE WITH OPEN COLLECTOR DEVICE

*DO NOT DRIVE PIN WITH A VOLTAGE

Default Turn-on voltage: 2.9 V (300 mV Hysteresis)

The Turn-on voltage may be adjusted with a resistor placed

between the “Enable” and “Ground” pins.

The formula for calculating the value of this resistor is:

Ruvlo (kΩ) =

14.81 * 6.81

(6.81 * VTurn_on) - 18.16

*ONLY USE WITH OPEN COLLECTOR DEVICE

*DO NOT DRIVE PIN WITH A VOLTAGE

Notes:

1. Measured as per recommended minimum system capacitance.

2. di/dt = 10 A/ µs,12 Vin = Norm, Tc = 25 °C, load change = 50% lo 100% Imax.

3. Internal input capacitance is rated 16 Vdc maximum.

External input fusing is recommended.