LT3060 datasheet(13/28 Pages) LINER

13 / 28 page

LT3065 Series

3065fc

For more information www.linear.com/LT3065

pin FuncTions (DFN/MSOP)

Temperature in the Typical Performance Characteristics

section).TheADJpinvoltageis600mVreferencedtoGND.

Connecting a capacitor from OUT to ADJ reduces output

noiseandimprovestransientresponseforoutputvoltages

greaterthan600mV.SeetheApplicationsInformationsec-

tion for calculating the value of the feedforward capacitor.

At output voltages above 0.6V, the resistor divider

connected to the ADJ pin is used to regulate voltage at

the load. Parasitic resistances of PCB traces or cables can

therefore result in load regulation errors at high output

currents. To eliminate these, connect the resistor divider

directly to the load for a Kelvin sense connection, as

shown in Figure 1.

Fixed Voltage Version Only

GND (Exposed Pad Pin 11, Exposed Pad Pin 13): Ground.

The exposed pad of the DFN and MSOP packages is an

electrical connection to GND. To ensure proper electrical

and thermal performance, solder Pin 11/Pin 13 to the

PCB ground.

SENSE (Pin 8/Pin 10): Sense. This pin is the top of the

internal resistor divider network, and should be connected

directly to the load, as a Kelvin sense, for optimum load

regulation and transient performance. Connecting this

pin to the output pin at the package, rather than directly

to the load, can result in load regulation errors due to the

current across the parasitic resistance of the PCB trace.

ADJ (Pin 7/Pin 9): Adjust. This pin is the midpoint of the

internal resistor divider network and the inverting input

to the error amplifier. Connecting a capacitor from the

OUT to ADJ reduces output noise and improves transient

response. See the Applications Information section for

calculating the value of the feedforward capacitor; the

internal divider current is 5µA. This pin should not be

used for any other purpose.

proportional to the BYP capacitor value. If the LT3065

is placed in shutdown, BYP is actively pulled low by an

internal device to reset soft-start. If low noise or soft-start

performance is not required, this pin must be left floating

(unconnected).Donotdrivethispinwithanyactivecircuitry.

Because the REF/BYP pin is the reference input to the

error amplifier, stray capacitance at this point should be

minimized. Special attention should be given to any stray

capacitances that can couple external signals onto the

REF/BYP pin producing undesirable output transients or

ripple. A minimum capacitance of 100pF from REF/BYP

to GND is recommended.

OUTPUT (Pins 9,10/Pins 11,12): Output. These pins sup-

ply power to the load. Stability requirements demand a

minimum3.3µFceramicoutputcapacitorwithanESR<1Ω

to prevent oscillations. Applications with output voltages

less than 1.2V require a minimum 4.7µF ceramic output

capacitor. Large load transient applications require larger

output capacitors to limit peak voltage transients. See the

Applications Information section for details on transient

response and reverse output characteristics. Permissible

output voltage range is 600mV to 40V.

Adjustable Version Only

GND (Pin 7, Exposed Pad Pin 11/Pin 9, Exposed Pad

Pin 13): Ground. The exposed pad of the DFN and MSOP

packages is an electrical connection to GND. To ensure

proper electrical and thermal performance, solder Pin

11/Pin 13 to the PCB GND and tie it directly to Pin 7/Pin

9. For the adjustable LT3065, connect the bottom of the

external resistor divider that sets output voltage directly

to GND (Pin 7/Pin 9)for optimum load regulation.

ADJ (Pin 8/Pin 10): Adjust. This pin is the error ampli-

fier’s inverting terminal. It’s typical bias current of 16nA

flows out of the pin (see curve of ADJ Pin Bias Current vs

LT3060 датащи(PDF) 13 Page - Linear Technology

LT3060 датащи(HTML) 13 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

датащи скачать

ссылки URL