參數(shù)資料
型號(hào)： LTC1760
廠商： Linear Technology Corporation
英文描述： Dual Smart Battery System Manager
中文描述： 雙智能電池系統(tǒng)管理
文件頁(yè)數(shù)： 39/44頁(yè)
文件大?。?/td> 379K
代理商： LTC1760
LTC1760
39
sn1760 1760is
The LTC1760 has two transient conditions that force the
discharge path P-channel MOSFETs to have two additional
parameters to consider. The parameters are gate charge
Q
GATE
and single pulse power capability.
When the LTC1760 senses a LOW_POWER event, all the
P-channel MOSFETs are turned on simultaneously to
allow voltage recovery due to a loss of a given power
source. However, there is a delay in the time it takes to turn
on all the MOSFETs. Slow MOSFETs will require more bulk
capacitance to hold up all the system’s power supply
function during the transition and fast MOSFET will require
less bulk capacitance. The transition speed of a MOSFET
to an on or off state is a direct function of the MOSFET gate
charge.
t = Q
GATE
/I
DRIVE
I
DRIVE
is the fixed drive current into the gate from the
LTC1760 and “t” is the time it takes to move that charge to
a new state and change the MOSFET conduction mode.
Hence time is directly related to Q
GATE
. Since Q
GATE
goes
up with MOSFETs of lower R
DS(ON)
, choosing such
MOSFETs has a counterproductive increase in gate charge
making the MOSFET slower. Please note that the LTC1760
recovery time specification only refers to the time it takes
for the voltage to recover to the level just prior to the
LOW_POWER event as opposed to full voltage.
The single pulse current rating of MOSFET is important
when a short-circuit takes place. The MOSFET must
survive a 15ms overload. MOSFETs of lower R
DS(ON)
or
MOSFETs that use more powerful thermal packages will
have a high power surge rating. Using too small of a pulse
rating will allow the MOSFET to blow to the open circuit
condition instantly like a fuse. Typically there is no
outward sign of failure because it happens so fast. Please
measure the surge current for all discharge power paths
under worse case conditions and consult the MOSFET
data sheet for the limitations. Voltage sources with the
highest voltage and the most bulk capacitance are often
the biggest risk. Specifically the MOSFETs in the wall
adapter path with wall adapters of high voltage, large bulk
capacitance and low resistance DC cables between the
adapter and device are the most common failures.
Remember to onlyuse the realwall adapter with a produc-
tion DC power cord when performing the wall adapter path
test. The use of a laboratory power supply is unrealistic for
this test and will force you to over specify the MOSFET
ratings. A battery pack usually has enough series resis-
tance to limit the peak current or are too low in voltage to
create enough instantaneous power to damage their re-
spective power path MOSFETs.
Conditioning Systems With Large Loads
In systems where the load is too large to be used for
conditioning a single battery it may be necessary to
bypass the built in calibrate function and simply switch in
an external load. A convenient way to accomplish this task
is by using an SMBus based LTC1623 load switch control-
ler. See Figure 10.
APPLICATIOU
W
U
U
Figure.10
PowerPath
MUX
LTC1760
CHARGE
MUX
LTC1623
SMBus
SMBus
TO/FROM
HOST
TO
LOAD
CONDITIONING
LOAD
1760 F10
相關(guān)PDF資料
PDF描述
LTC1760CFW Dual Smart Battery System Manager
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LTC2286IUP Dual 10-Bit, 65/40/25Msps Low Noise 3V ADCs
LTC2286UP Dual 10-Bit, 65/40/25Msps Low Noise 3V ADCs
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1760CFW 功能描述:IC MANAGER BATTERY DUAL 48TSSOP 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#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)
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