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參數(shù)資料
| 型號： | LTC4075HVXEDD#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封裝： | 3 X 3 MM, 0.75 MM HEIGHT, PLASTIC, MO-229WEED-2, DFN-10 |
| 文件頁數(shù)： | 16/16頁 |
| 文件大?。?/td> | 170K |
| 代理商： | LTC4075HVXEDD#TR |
LTC4075HVX
9
4075hvxf
OPERATION
The LTC4075HVX is designed to efciently manage charg-
ing of a single-cell lithium-ion battery from two separate
power sources: a wall adapter and USB power bus. Us-
ing the constant-current/constant-voltage algorithm, the
charger can deliver up to 950mA of charge current from
the wall adapter supply or up to 850mA of charge current
from the USB supply with a nal oat voltage accuracy of
±0.6%. The LTC4075HVX has two internal P-channel power
MOSFETs and thermal regulation circuitry. No blocking
diodes or external sense resistors are required.
Power Source Selection
The LTC4075HVX can charge a battery from either the wall
adapter input or the USB port input. The LTC4075HVX au-
tomatically senses the presence of voltage at each input. If
both power sources are present, the LTC4075HVX defaults
to the wall adapter source provided a valid voltage is pres-
ent at the DCIN input. “Valid voltage” is dened as:
Supply voltage is greater than the undervoltage lock-
out threshold and less than the overvoltage lockout
threshold.
Supply voltage is greater than the battery voltage by
40mV.
The open drain power status outputs (PWR and USBPWR)
indicate which power source has been selected. Table 1
describes the behavior of these status outputs.
Programming and Monitoring Charge Current
The charge current delivered to the battery from the wall
adapter or USB supply is programmed using a single re-
sistor from the IDC or IUSB pin to ground. Both program
resistors and charge currents (ICHRG) are calculated using
the following equations:
R
V
I
V
R
IDC
CHRG DC
IDC
IUSB
==
=
1000
,
1
1000
V
I
V
R
CHRG USB
IUSB
=
,
*Any external sources that hold the ITERM pin above 100mV will prevent the LTC4075HVX from
terminating a charge cycle.
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
=
, (
arg
1000
))
, (
arg
sup
I
V
R
ch
ing from USB
p
BAT
IUSB
=
1000
lly)
Programming Charge Termination
The charge cycle terminates when the charge current
falls below the programmed termination threshold level
during constant-voltage mode. This threshold is set by
connecting an external resistor, RITERM, from the ITERM
pin to ground. The charge termination current threshold
(ITERMINATE) is set by the following equation:
R
V
I
V
R
ITERM
TERMINATE
ITERM
==
100
,
The termination condition is detected by using an internal
ltered comparator to monitor the ITERM pin. When the
ITERM pin voltage drops below 100mV* for longer than
tTERMINATE (typically 1.6ms), charging is terminated. The
charge current is latched off and the LTC4075HVX enters
standby mode.
When charging, transient loads on the BAT pin can cause
the ITERM pin to fall below 100mV for short periods of
time before the DC charge current has dropped below the
programmed termination current. The 1.6ms lter time
(tTERMINATE) on the termination comparator ensures that
transient loads of this nature do not result in premature
charge cycle termination. Once the average charge cur-
rent drops below the programmed termination threshold,
the LTC4075HVX terminates the charge cycle and stops
providing current out of the BAT pin. In this state, any load
on the BAT pin must be supplied by the battery.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4075X | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Input USB/AC Adapter Standalone Li-Ion Battery Chargers |
| LTC4075XEDD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Input USB/AC Adapter Standalone Li-Ion Battery Chargers |
| LTC4076 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Input Standalone Li-Ion Battery Charger |
| LTC4076EDD | 功能描述:IC CHARG BATT LI-ON USB 10DFN RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC4076EDD#PBF | 功能描述:IC CHARG BATT LI-ON USB 10DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:Impedance Track™ 功能:燃料，電量檢測計(jì)/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.4 V ~ 2.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:帶卷 (TR) 產(chǎn)品目錄頁面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名稱:296-21665-2 |
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