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参数资料
| 型号： | LTC4008EGN |
| 厂商： | Linear Technology |
| 文件页数： | 10/24页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHARGER CTRLR 4A 20SSOP |
| 标准包装： | 55 |
| 功能： | 充电管理 |
| 电池化学： | 多化学 |
| 电源电压： | 6 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 管件 |
LTC4008
OPERATION
Input FET (LTC4008)
OFF
The input FET circuit performs two functions. It enables
the charger if the input voltage is higher than the CLP
TGATE
ON
ON
pin and provides the logic indicator of AC present on the
ACP/ SHDN pin. It controls the gate of the input FET to
keep a low forward voltage drop when charging and also
BGATE
OFF
t OFF
TRIP POINT SET BY ITH VOLTAGE
= CSP BAT
I CHARGE ( MAX ) = ? REF – 11 . 67 μ A ? ?
V PROG = ( I CHARGE ? R SENSE + 11 . 67 μ A ? 3 . 01 k Ω ) ?
prevents reverse current ?ow through the input FET.
If the input voltage is less than V CLP , it must go at least
170mV higher than V CLN to activate the charger. When this
occurs the ACP/ SHDN pin is released and pulled up with
an external load to indicate that the adapter is present.
The gate of the input FET is driven to a voltage suf?cient
to keep a low forward voltage drop from drain to source.
If the voltage between DCIN and CLP drops to less than
25mV, the input FET is turned off slowly. If the voltage
between DCIN and CLP is ever less than –25mV, then
the input FET is turned off in less than 10μs to prevent
signi?cant reverse current from ?owing in the input FET.
In this condition, the ACP/ SHDN pin is driven low and the
charger is disabled.
Input FET (LTC4008-1)
The input FET circuit is disabled for the LTC4008-1. There
is no low current shutdown mode when DCIN falls below
the CLP pin. The ACP/ SHDN pin functions only to shut
down the charger.
Battery Charger Controller
The LTC4008 charger controller uses a constant off-time,
current mode step-down architecture. During normal
operation, the top MOSFET is turned on each cycle when
the oscillator sets the SR latch and turned off when the
main current comparator I CMP resets the SR latch. While
the top MOSFET is off, the bottom MOSFET is turned on
until either the inductor current trips the current compara-
tor I REV or the beginning of the next cycle. The oscillator
uses the equation:
INDUCTOR
CURRENT
4008 F01
Figure 1
The peak inductor current, at which I CMP resets the SR
latch, is controlled by the voltage on I TH . I TH is in turn
controlled by several loops, depending upon the situation
at hand. The average current control loop converts the
voltage between CSP and BAT to a representative cur-
rent. Error amp CA2 compares this current against the
desired current programmed by R PROG at the PROG pin
and adjusts I TH until:
V REF V – V + 11 .67 μ A ? 3 .01k Ω
R PROG 3 . 01 k Ω
therefore,
? V ? 3.01k Ω
? R PROG ? R SENSE
The voltage at BATMON is divided down by an external
resistor divider and is used by error amp EA to decrease
I TH if the divider voltage is above the 1.19V reference.
When the charging current begins to decrease, the voltage
at PROG will decrease in direct proportion. The voltage at
PROG is then given by:
R PROG
3 . 01 k Ω
The accuracy of V PROG will range from 0% to I TOL .
V PROG is plotted in Figure 2.
= DCIN BAT
t OFF
V – V
V DCIN ? f OSC
The ampli?er CL1 monitors and limits the input current,
normally from the AC adapter to a preset level (100mV/R CL ).
At input current limit, CL1 will decrease the I TH voltage,
to set the bottom MOSFET on time. This activity is dia-
grammed in Figure 1.
thereby reducing charging current. The I CL indicator output
will go low when this condition is detected and the FLAG
indicator will be inhibited if it is not already low.
4008fb
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4008EGN#PBF | 功能描述:IC BATT CHARGER CTRLR 4A 20SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 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:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LTC4008EGN#TR | 功能描述:IC CTRLR CHARGR PWM CC/CV 20SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 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) |
| LTC4008EGN#TRPBF | 功能描述:IC BATT CHARGER CTRLR 4A 20SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 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) |
| LTC4008EGN-1 | 功能描述:IC BATT CHARGER CTRLR 4A 20SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 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) |
| LTC4008EGN-1#PBF | 功能描述:IC BATT CHARGER CTRLR 4A 20SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 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:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
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