LT8490_15 datasheet(9/42 Pages) LINER

9 / 42 page

LT8490

8490f

For more information www.linear.com/LT8490

pin FuncTions

RT (Pin 22): Timing Resistor Pin. Adjusts the switching

regulator frequency (OSC1) when SYNC is not driven by

a clock. Place a resistor from this pin to ground to set

the free-running frequency of OSC1. Do not float this pin.

BG1, BG2 (Pin 23/Pin 25): Bottom Gate Drive. Drives the

gates of the bottom N-channel MOSFETs between ground

and GATEVCC.

GATEVCC (Pin 24): Power Supply for Gate Drivers. Must

be connected to the INTVCC pin. Do not power from any

other supply. Locally bypass to ground.

BOOST1,BOOST2(Pin33/Pin27):BoostedFloatingDriver

Supply. The (+) terminal of the bootstrap capacitor con-

nects here. The BOOST1 pin swings from a diode voltage

below GATEVcc up to VIN + GATEVCC. The BOOST2 pin

swings from a diode voltage below GATEVCC up to VBAT

+ GATEVCC.

TG1, TG2 (Pin 32/Pin 28): Top Gate Drive. Drives the top

N-channelMOSFETswithvoltageswingsequaltoGATEVCC

superimposed on the switch node voltages.

SW1,SW2(Pin31/Pin29):SwitchNodes.The(–)terminal

of the bootstrap capacitors connect here.

SRVO_FBIN (Pin 35): Open-Drain Logic Output. This pin

is pulled to ground when the input voltage feedback loop

is active. This pin is unused for most LT8490 applications

and can be floated.

SRVO_IIN (Pin 36): Open-Drain Logic Output. This pin is

pulled to ground when the input current feedback loop is

active. This pin is unused for most LT8490 applications

and can be floated.

SRVO_IOUT (Pin 37): Open-Drain Logic Output. This pin

is pulled to ground when the output current feedback loop

is active. This pin is unused for most LT8490 applications

and can be floated.

SRVO_FBOUT(Pin38):Open-DrainLogicOutput.Thispin

is pulled to ground when the output voltage feedback loop

is active. This pin is unused for most LT8490 applications

and can be floated.

EXTVCC (Pin 40): External VCC Input. When EXTVCC ex-

ceeds 6.4V (typical), INTVCCwillbepoweredfromthispin.

When EXTVCC is lower than 6.22V (typical), INTVCC will be

powered from VIN. See Switching Configuration - MODE

Pin for additional details.

CSNOUT (Pin 41): The (–) Input to the Output Current

Sense Amplifier.

CSPOUT (Pin 42): The (+) Input to the Output Current

Sense Amplifier. This pin and the CSNOUT pin measure

the voltage across the sense resistor to provide the output

current signals.

CSNIN (Pin 44): The (–) Input to the Input Current Sense

Amplifier. This pin and the CSPIN pin measure the voltage

across the sense resistor to provide the instantaneous

input current signals.

CSPIN (Pin 45): The (+) Input to the Input Current Sense

Amplifier.

VIN (Pin 46): Main Input Supply Pin. Must be bypassed

to local ground plane.

ECON (Pin 48): Digital Output Pin. Optional control output

signal used to disconnect EXTVCC from the battery when

the average charge current drops below a predetermined

threshold.

SWENO (Pin 49): Digital Output Pin. Connect to SWEN.

Enables the switching regulator. A 200kΩ pull-down re-

sistor is required from this pin to ground.

IOW (Pin 50): Digital Output Pin. Connects to IMON_OUT

through a resistor. By switching the pin between logic low

and high impedance, the total RIMON_OUT changes, which

changes the output current limit.

STATUS (Pin 51): Digital Output Pin. When used with an

LED, this signal provides a visual indication of the pro-

gress of the charging algorithm. In addition, STATUS

transmits two UART bytes (8 bits, no parity, one stop bit,

2400 baud) every 3.5 seconds (typical), which indicates

status and fault information.

IIR (Pin 53): A/D Input Pin. Connects to IMON_IN to read

input current. Used to manage MPPT.

LT8490 データシート(PDF) 9 Page - Linear Technology

LT8490 データシート(HTML) 9 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 29 30 31 32 33 34 35 36 37 38 39 40 41 42

データシートダウンロード

リンク URL

LT8490 データシート(PDF) 9 Page - Linear Technology

LT8490 データシート(HTML) 9 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 29 30 31 32 33 34 35 36 37 38 39 40 41 42

データシート ダウンロード

リンク URL

データシートダウンロード