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)： 27/40頁
文件大小： 428K
代理商： LTC4000IUFD#PBF
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PDF資料
PDF描述
LTC4000EUFD#PBF 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC28
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