參數(shù)資料
型號(hào)： LTC1760CFW
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： Dual Smart Battery System Manager
中文描述： 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO48
封裝： 6.10 MM, PLASTIC, TSSOP-48
文件頁(yè)數(shù)： 38/44頁(yè)
文件大小： 379K
代理商： LTC1760CFW
LTC1760
38
sn1760 1760is
For example:
V
DCIN
= 19V, V
BAT
= 12.6V, L1 = 10
μ
H, and
f = 300kHz, I
RMS
= 0.41A.
EMI considerations usually make it desirable to minimize
ripple current in the battery leads, and beads or inductors
may be added to increase battery impedance at the 300kHz
switching frequency. Switching ripple current splits be-
tween the battery and the output capacitor depending on
the ESR of the output capacitor and the battery imped-
ance. If the ESR of C
OUT
is 0.2
and the battery impedance
is raised to 4
with a bead or inductor, only 5% of the
current ripple will flow in the battery.
Power Path and Charge MUX MOSFET Selection
Three pairs of P-channel MOSFETs must be used with the
wall adapter and the two battery discharge paths. Two
pairs of N-channel MOSFETs must be used with the
battery charge path. The nominal gate drive levels are set
by the clamp drive voltage of their respective control
circuitry. This voltage is typically 6.25V. Consequently,
logic-level threshold MOSFETs must be used. Pay close
attention to the B
VDSS
specification for the MOSFETs as
well; many of the logic level MOSFETs are limited to 30V
or less.
Selection criteria for the power MOSFETs include the “ON”
resistance R
DS(ON)
, input voltage and maximum output
current. For the N-channel charge path, the maximum
current is the maximum programmed current to be used.
For the P-channel discharge path maximum current typi-
cally occurs at end of life of the battery when using only
one battery. The upper limit of R
DS(ON)
value is a function
of the actualpower dissipation capability of a given
MOSFET package that must take into account the PCB
layout. As a starting point, without knowing what the PCB
dissipation capability would be, derate the package power
rating by a factor of two.
R
P
I
DS ON MAX
(
MOSFET
(
MAX
)
=
)
2
2
If you are using a dual MOSFET package with both MOSFETs
in series, you must cut the package power rating in half
again and recalculate.
R
P
I
DS ON MAX
(
MOSFETDUAL
(
MAX
)
=
)
4
2
If you use identical MOSFETs for both battery paths,
voltage drops will track over a wide current range. The
LTC1760 linear 25mV CV drop regulation will not occur
until the current has dropped below:
I
mV
R
LINEARMAX
DS ON MAX
(
=
25
2
)
However, if you try to use the above equation to determine
R
DS(ON)
to force linear mode at full current, the MOSFET
R
DS(ON)
value becomes unreasonably low for MOSFETs
available at this time. The need for the LTC1760 voltage
drop regulation only comes into play for parallel battery
configurations that terminate charge or discharge using
voltage. At first this seems to be a problem, but there are
several factors helping out:
1. When batteries are in parallel current sharing, the
current flow through any one battery is less than if it is
running stand-alone.
2. Most batteries that charge in constant voltage mode,
such as Li-ion, charge terminate at a current value of
C/10 or less which is well within the linear operation
range of the MOSFETs.
3. Voltage tracking for the discharge process does not
need such precise voltage tracking values.
APPLICATIOU
W
U
U
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1760CFW#PBF 功能描述:IC MANAGER BATTERY DUAL 48TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關(guān)文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標(biāo)準(zhǔn)包裝:4,000 系列:- 功能:燃料，電量檢測(cè)計(jì)/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2
LTC1760CFW#PBF 制造商:Linear Technology 功能描述:Battery Management IC 制造商:Linear Technology 功能描述:IC, BATTERY CHARGER, 4.28A, TSSOP-48
LTC1760CFW#TR 功能描述:IC MANAGER BATTERY SYS 48-TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR)
LTC1760CFW#TRPBF 功能描述:IC MANAGER BATTERY DUAL 48TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR)
LTC1760CFWPBF 制造商:Linear Technology 功能描述:Dual Smart Battery Sys. Manager TSSOP48
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