参数资料
| 型号： | LTC4000IGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 31/40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) |
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LTC4000
APPLICATIONS INFORMATION
INPUT
CC
C C
–
+
+ Gmo p (s)
–
A7
R L
C L
+
– 1.193V
INPUT
CC
C C
–
+
+ Gmo p (s)
–
TheOutputVoltageRegulationLoop
The feedback signal for the output voltage regulation loop
is the voltage on the OFB pin, which is connected to the
center node of the resistor divider between the output
voltage (connected to C SP ) and the FBG pin. This voltage
is compared to an internal reference (1.193V typical) by
the transconductance error amplifier A7. This amplifier
then drives the output transconductance amplifier (A10)
to appropriately adjust the voltage on the ITH pin driving
the external DC/DC converter to regulate the output volt-
age observed by the OFB pin. This loop is shown in detail
in Figure 21.
LTC4000
A10
g m10 = 0.1m
R C
ITH
R O10
LOAD
CSP
g m7 = 0.5m R OFB1
OFB
R O7 R OFB2
FBG
INTERNALLY
PULLED HIGH
The Battery Float Voltage Regulation Loop
The battery float voltage regulation loop is very similar to
the output float voltage regulation loop. Instead of observ-
ing the voltage at the OFB pin, the battery float voltage
regulation loop observes the voltage at the BFB pin.
One significant difference is that while the value of R L
in the output voltage loop can vary significantly, the
output resistance of the battery float voltage loop is a
small constant value approximately equal to the sum
of the on-resistance of the external PFET (R DS(ON) ) and
the series internal resistance of the battery (R BAT ). This
approximation is valid for any efficient system such that
most of the output power from the battery is delivered to
the system load and not dissipated on the battery inter-
nal resistance or the charging PFET on-resistance. For a
typical system, minimum R L is at least five times larger
than R DS(ON) + R BAT and R BFB is at least 10 6 times larger
than R BAT . Figure 22 shows the detail of the battery float
voltage regulation loop.
LTC4000
A10
g m10 = 0.1m
R C
ITH
R O10
4000 F21
Figure 21. Simplified Linear Model of the Output Voltage
Regulation Loop
The simplified loop transmission is as follows:
R O6
A7
g m6 = 0.5m
+
– 1.136V
BAT
BFB
FBG
R BFB1
R BFB2
R CS
R DS(ON)
R BAT
LOAD
C L
R L
? ? R C –
L OV (s) = g m7 ?
C C s + 1 ?
? ?
? ?
?
?
?
?
1 ?
g m10 ? ?
C C s
?
?
?
?
INTERNALLY
PULLED HIGH
4000 F22
Figure 22. Simplified Linear Model of the Battery Float
Voltage Regulation Loop
? ? ?
? ? Gmo p (s)
? R OFB2 ? ? R L ?
? R OFB ? ? R L ? C L s + 1 ?
?
where Gmo p (s) is the transfer function from V ITH to
the output current of the external DC/DC converter, and
R OFB = R OFB1 + R OFB2 .
4000fb
For more information www.linear.com/LTC4000
31
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| LTC4000IUFD#PBF | 功能描述:IC CHARGER BATTERY 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:PowerPath™ 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTC4000IUFD#TRPBF | 功能描述:IC CHARGER BATTERY 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:PowerPath™ 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTC4000IUFD-1#PBF | 功能描述:IC BATT CHRGR MULTI-CHEM 28QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:PowerPath™ 标准包装:2,000 系列:Impedance Track™ 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.4 V ~ 2.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:带卷 (TR) 产品目录页面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名称:296-21665-2 |
| LTC4000IUFD-1#TRPBF | 功能描述:IC CHARGE MGMT MULTI CHEM 28QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:PowerPath™ 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTC4001 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2A Synchronous Buck Li-Ion Charger |
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