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參數(shù)資料
| 型號： | LTC4000IUFD#PBF |
| 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 |
| 文件頁數(shù)： | 28/40頁 |
| 文件大?。?/td> | 428K |
| 代理商： | LTC4000IUFD#PBF |
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LTC4000
34
4000f
The Battery Charge Current Regulation Loop when
VOFB is Regulated to VOUT(INST_ON)
When the battery voltage is below the instant-on level,
the external charging PFET is driven linearly to regulate
the voltage at the output (connected to the CSP pin). The
output voltage is regulated such that the voltage at the OFB
pin is equal to the instant-on threshold (VOUT(INST_ON)).
If this external PFET regulation is fast compared to the
unity crossover frequency of the battery charge current
regulation loop, then the voltage at the output can be con-
sidered a small signal ground. However, in the LTC4000
the external PFET regulation is purposely made slow to
allow for a broader selection of possible PFETs to be used.
Therefore, the linear model of the PFET has to be included
in the analysis of the charge current regulation loop. The
detail of this loop is shown in Figure 24.
Figure 24. Simplified Linear Model of the Charge
Current Regulation Loop with the External Charging
PFET Linearly Regulated
The simplified loop transmission is:
LCC2(s) = gm5
RC –
1
gm10
CCs + 1
CCs
20RCS
R2 CIBMONs + 1
(
)
R1+ R2
(
)CIBMONs + 1
RL
RfIDC + RL
1
RL RfIDC
(
)CLs + 1
Cg
gmEXT
s + 1
RCS + RBAT
RfIDC
Cg
gmEXT
s + 1
Gmop(s)
where Gmop(s) is the transfer function from VITH to the
output current of the external DC/DC converter, gmEXT is
the small signal transconductance of the output PFET,
RflDC = RCS + 1/gmEXT + RBAT and RL//RflDC represents
the effective resistance value resulting from the parallel
combination of RL and RflDC.
applicaTions inForMaTion
CC
A8
gm8 = 0.33m
A10
gm10 = 0.1m
ITH
INPUT
CSP
CSN
LTC4000
BAT
CC
4000 F24
RC
Gmop(s)
R2
20k
R1
60k
RO10
RO5
–
+
CL
RL
CIBMON
IBMON
CL
+
–
RBAT
1
gmEXT
RCS
1V
A5
gm5 = 0.5m
RCL
+
–
+
–
50A/
5A
BIAS
Cg
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| 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 |
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