參數(shù)資料
型號(hào)： LTC4000IUFD#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC28
封裝： 4 X 5 MM, LEAD FREE, PLASTIC, MO-220WXXX-X, QFN-28
文件頁(yè)數(shù)： 27/40頁(yè)
文件大?。?/td> 428K
代理商： LTC4000IUFD#TRPBF
LTC4000
33
4000f
In Figure 22 the battery is approximated to be a signal
ground in series with the internal battery resistance RBAT.
Therefore, the simplified loop transmission is as follows:
LBV(s) = gm6
RC –
1
gm10
CCs + 1
CCs
RBFB2
RBFB
RLB
RLB CLs+1
Gmop(s)
where Gmop(s) is the transfer function from VITH to
the output current of the external DC/DC converter,
RBFB = RBFB1 + RBFB2, and RLB = RL//(RDS(ON) + RCS +
RBAT) represents the effective output resistance from the
LOAD node to GND.
The Battery Charge Current Regulation Loop
This final regulation loop combines certain dynamic char-
acteristics that are found in all the other three loops. The
feedback signal for this charge current regulation loop is
the sense voltage across the charge current sense resis-
tor (RCS). This voltage is amplified by a factor of 20 and
compared to the voltage on the CL pin by the transcon-
ductance error amplifier (A5). In a familiar fashion, this
amplifier drives the output transconductance amplifier
(A10) to appropriately adjust the voltage on the ITH pin
driving the external DC/DC converter to regulate the input
current across the sense resistor (RCS).
Due to the presence of the instant-on feature, description
of the charge current regulation loop has to be divided into
twoseparateoperatingregions.Theseregionsofoperation
depend on whether the voltage on the OFB pin is higher
or lower than the instant-on threshold (VOUT(INST_ON)).
The Battery Charge Current Regulation Loop when
VOFB > VOUT(INST_ON)
In this operating region, the external charging PFET’s gate
is driven low and clamped at VBGATE(ON). The detail of this
loop is shown in Figure 23.
The simplified loop transmission is:
LCC(s) = gm5
RC –
1
gm10
CCs + 1
CCs
20RCS
R2 CIBMONs+1
(
)
R1+R2
(
)CIBMONs+1
RL
Rf +RL
1
RL Rf
(
)CLs+1
Gmop(s)
where Gmop(s) is the transfer function from VITH to
the output current of the external DC/DC converter, Rf =
RCS + RDS(ON) + RBAT, and RL//Rf represents the effective
resistance value resulting from the parallel combination
of RL and Rf.
applicaTions inForMaTion
Figure 23. Simplified Linear Model of the Charge Current
Regulation Loop with the External Charging PFET Driven On
CC
A8
gm8 = 0.33m
A10
gm10 = 0.1m
ITH
INPUT
CSP
CSN
LTC4000
BAT
CC
4000 F23
RC
Gmop(s)
R2
20k
R1
60k
RO10
RO5
–
+
CL
RL
CIBMON
IBMON
CL
+
–
RBAT
RDS(ON)
RCS
1V
A5
gm5 = 0.5m
RCL
+
–
+
–
50A/
5A
BIAS
相關(guān)PDF資料
PDF描述
LTC4075XEDD 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10
LTC4075XEDD#PBF 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10
LTC4095EDC#TR 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
LTC4095EDC 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
LTC4095EDC#TRM 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC4001 制造商:LINER 制造商全稱:Linear Technology 功能描述:2A Synchronous Buck Li-Ion Charger
LTC4001-1 制造商:LINER 制造商全稱:Linear Technology 功能描述:2A Synchronous Buck Li-Ion Charger
LTC4001EUF 制造商:Linear Technology 功能描述:Battery Charger Li-Ion/Li-Pol 2000mA 4.2V 16-Pin QFN EP
LTC4001EUF#PBF 功能描述:IC CHARGER LI-ION BUCK 16-QFN 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
LTC4001EUF#TRPBF 功能描述:IC CHARGER LI-ION BUCK 16-QFN RoHS:是 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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*