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參數(shù)資料
| 型號(hào)： | LTC4075XEDD#PBF |
| 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(yè)數(shù)： | 16/16頁(yè) |
| 文件大?。?/td> | 195K |
| 代理商： | LTC4075XEDD#PBF |
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LTC4075/LTC4075X
9
4075Xfa
The LTC4075 is designed to efciently manage charging of
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 950mA of charge current from the wall
adapter supply or up to 650mA of charge current from the
USB supply with a nal oat voltage accuracy of ±0.6%.
The LTC4075 has two internal P-channel power MOSFETs
and thermal regulation circuitry. No blocking diodes or
external sense resistors are required.
Power Source Selection
The LTC4075 can charge a battery from either the wall
adapter input or the USB port input. The LTC4075 automati-
cally senses the presence of voltage at each input. If both
power sources are present, the LTC4075 defaults to the
wall adapter source provided sufcient power is present
at the DCIN input. “Sufcient power” is dened as:
Supply voltage is greater than the UVLO threshold.
Supply voltage is greater than the battery voltage by
50mV (180mV rising, 50mV falling).
The open drain power status outputs (
PWRandUSBPWR)
indicate which power source has been selected. Table 1
describes the behavior of these status outputs.
Table 1. Power Source Selection
VUSBIN > 3.95V and
VUSBIN < 3.95V or
VUSBIN > BAT + 50mV
VUSBIN < BAT + 50mV
VDCIN > 4.15V and
Device powered from
VDCIN > BAT + 50mV
wall adapter source;
wall adapter source
USBIN current < 25A
PWR: LOW
USBPWR: LOW
VDCIN < 4.15V or
Device powered from
No charging
VDCIN < BAT + 50mV
USB source;
PWR: LOW
PWR: Hi-Z
USBPWR: Hi-Z
USBPWR: LOW
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. Likewise, the charge current
from the USB supply is programmed using a single resis-
tor from the IUSB pin to ground. The program resistor
and the charge current (ICHRG) are calculated using the
following equations:
R
V
I
V
R
V
I
V
R
IDC
CHRG DC
IDC
IUSB
CHRG USB
IUSB
==
1000
,
Charge current out of the BAT pin can be determined at
any time by monitoring the IDC or IUSB pin voltage and
using the following equations:
I
V
R
ch
ing fromwall adapter
I
V
R
ch
ing fromUSB
ply
BAT
IDC
BAT
IUSB
=
, ( arg
)
, ( arg
sup
)
1000
Programming Charge Termination
The charge cycle terminates when the charge current falls
below the programmed termination threshold during con-
stant-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
,
OPERATIO
U
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