参数资料
型号: LTC4000IGN#TRPBF
厂商: Linear Technology
文件页数: 33/40页
文件大小: 0K
描述: IC CHARGER BATTERY 28-SSOP
产品培训模块: LTC4000 60V Battery Charging Controller and Power Management
标准包装: 2,500
系列: PowerPath™
功能: 充电管理,电源管理
电池化学: 多化学
电源电压: 3 V ~ 60 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 28-SSOP(0.154",3.90mm 宽)
供应商设备封装: 28-SSOP
包装: 带卷 (TR)
LTC4000
APPLICATIONS INFORMATION
? ? C C s + 1 ?
? ? R C –
L CC2 (s) = g m5 ?
? ?
? ( R2 ? C IBMON s + 1 ) ?
? ( R1 + R2 ) C IBMON s + 1 ?
R L
? ( R L P R fIDC ) C L s + 1 ?
R fIDC + R L
g mEXT
? ? ? Gmo p (s)
? ? R CS + R BAT ? C g
? ? g
R fIDC
? ? ?
TheBatteryChargeCurrentRegulationLoopwhen
V OFB is Regulated to V OUT(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 (V OUT(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.
The simplified loop transmission is:
? ? 1 ? ?
? g m10
? C C s ?
? ?
? ?
20R CS ? ? ? ?
? 1 ?
? ? ? ?
? C g ?
? s + 1 ?
?
? ? s + 1 ?
?
mEXT ?
R C
R O10
R O5
C C
ITH CC
A10
g m10 = 0.1m
A5
g m5 = 0.5m
A8
g m8 = 0.33m
LTC4000
CSP
INPUT
+
Gmo p (s)
C L
R L
where Gmo p (s) is the transfer function from V ITH to the
output current of the external DC/DC converter, g mEXT is
the small signal transconductance of the output PFET,
R flDC = R CS + 1/g mEXT + R BAT and R L //R flDC represents
the effective resistance value resulting from the parallel
combination of R L and R flDC .
BIAS
1V
50μA/
5μA
R1
60k
R2
20k
+
CSN
C g
R CS
1
g mEXT
CL
R CL
IBMON
C IBMON
BAT
4000 F24
R BAT
Figure 24. Simplified Linear Model of the Charge
Current Regulation Loop with the External Charging
PFET Linearly Regulated
4000fb
For more information www.linear.com/LTC4000
33
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