Electronic Components Datasheet Search |
|
LTC4097 Datasheet(PDF) 11 Page - Linear Technology |
|
LTC4097 Datasheet(HTML) 11 Page - Linear Technology |
11 / 20 page LTC4097 11 4097f OPERATION The LTC4097 is designed to efficiently manage charging a single-cell lithium-ion battery from two separate power sources: a wall adapter and USB power bus. Using the constant-current/constant-voltage algorithm, the charger can deliver up to 1.2A of charge current from the wall adapter supply or up to 1A of charge current from the USB supply with a final float voltage accuracy of ±0.6%. The LTC4097 has two internal P-channel power MOSFETs, thermal regulation and shut down circuitry. No blocking diodes or external sense resistors are required. Power Source Selection The LTC4097 can charge a battery from either the wall adapter input or the USB port input. The LTC4097 automati- cally senses the presence of voltage at each input. If both power sources are present, the LTC4097 defaults to the wall adapter source provided sufficient power is present at the DCIN input. “Sufficient power” is defined as: • Supply voltage is greater than the UVLO threshold. • Supply voltage is greater than the battery voltage by 30mV (100mV or 150mV rising, 30mV falling). The VNTC output pin indicates that sufficient input voltage is available. Table 1 describes the behavior of the power source selection. Table 1. Power Source Selection VUSBIN > 4V and VUSBIN > BAT + 30mV VUSBIN < 4V or VUSBIN < BAT + 30mV VDCIN > 4.2V and VDCIN > BAT + 30mV Charger powered from wall adapter source; USBIN current < 25µA Charger powered from wall adapter source VDCIN < 4.2V or VDCIN < BAT + 30mV Charger powered from USB source No charging Programming and Monitoring Charge Current The charge current delivered to the battery from the wall adapter supply is programmed using a single resistor from the IDC pin to ground. R V I I V R IDC CHRG DC CHRG DC IDC == 1000 1000 () () , Similarly, the charge current from the USB supply is programmed using a single resistor from the IUSB pin to ground. Setting HPWR pin to its high state will select 100% of the programmed charge current, while setting HPWR to its low state will select 20% of the programmed charge current. R V I HPWR HIGH I IUSB CHRG USB CHRG USB == 1000 () () () === = 1000 200 V R HPWR HIGH I V R IUSB CHRG USB IUS () () B B HPWR LOW () = Charge current out of the BAT pin can be determined at any time by monitoring the IDC or IUSB pin voltage and applying the following equations: I V R ch ing from wall adapter BAT IDC IDC = •, ( arg 1000 )) •, (arg sup I V R ch ing from USB p BAT IUSB IUSB = 1000 lly HPWR HIGH I V R ch in BAT IUSB IUSB ,) •, (arg = = 200 g g from USB ply HPWR LOW sup , ) = |
Similar Part No. - LTC4097 |
|
Similar Description - LTC4097 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |