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| 型号： | LTC4100EG#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/30页 |
| 文件大小： | 0K |
| 描述： | IC SMART BATTERY CHARGER 24-SSOP |
| 标准包装： | 59 |
| 功能： | 充电管理 |
| 电池化学： | 智能电池 |
| 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： | 24-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 管件 |
| 产品目录页面： | 1341 (CN2011-ZH PDF) |
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LTC4100
OPERATION
voltage between CSP and BAT to a representative current.
Error amp CA2 compares this current against the desired
current programmed by the I DAC at the I DC pin and adjusts
I TH for the desired voltage across R SENSE .
The voltage at BAT is divided down by an internal resis-
tor divider set by the V DAC and is used by error amp EA
to decrease I TH if the divider voltage is above the 1.19V
reference.
The amplifier 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 volt-
age to reduce charging current.
An overvoltage comparator, OV, guards against transient
overshoots (>7%). In this case, the top MOSFET is turned
off until the overvoltage condition is cleared. This feature
is useful for batteries that “load dump” themselves by
opening their protection switch to perform functions such
as calibration or pulse mode charging.
PWM Watchdog Timer
There is a watchdog timer that observes the activity on
the TGATE pin. If TGATE stops switching for more than
40μs, the watchdog activates and turns off the top MOSFET
for about 400ns. The watchdog engages to prevent very
low frequency operation in dropout—a potential source
of audible noise when using ceramic input and output
capacitors.
OFF
Charger Start-Up
When the charger is enabled, it will not begin switching
until the I TH voltage exceeds a threshold that assures initial
current will be positive. This threshold is 5% to 15% of the
maximum programmed current. After the charger begins
switching, the various loops will control the current at a
level that is higher or lower than the initial current. The
duration of this transient condition depends upon the loop
compensation, but is typically less than 1ms.
SMBus Interface
All communications over the SMBus are interpreted by the
SMBus interface block. The SMBus interface is a SMBus
slave device at address 0x12. All internal LTC4100 registers
may be updated and accessed through the SMBus interface,
and charger controller as required. The SMBus protocol is
a derivative of the I 2 C bus (Reference I 2 C-Bus and How to
Use It, V1.0 by Philips, and System Management Bus Speci-
fication, Version 1.1, from the SBS Implementers Forum, for
a complete description of the bus protocol requirements).
All data is clocked into the shift register on the rising
edge of SCL. All data is clocked out of the shift register
on the falling edge of SCL. Detection of an SMBus Stop
condition, or power-on reset via the V DD power-fail, will
reset the SMBus interface to an initial state at any time.
The LTC4100 command set is interpreted by the SMBus
interface and passed onto the charger controller block as
control signals or updates to internal registers.
TGATE
ON
BGATE
ON
OFF
t OFF
TRIP POINT SET
BY I TH VOLTAGE
INDUCTOR
CURRENT
4100 F03
Figure 3
* http://www.SBS-FORUM.org
11
For more information www.linear.com/LTC4100
4100fc
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4100EGTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Smart Battery Charger Controller |
| LTC4101 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Smart Battery Charger Controller |
| LTC4101EG | 制造商:LINER 制造商全称:Linear Technology 功能描述:Smart Battery Charger Controller |
| LTC4101EG#PBF | 功能描述:IC CNTRLR BATT CHRG 24-SSOP 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) |
| LTC4101EG#TRPBF | 功能描述:IC CNTRLR BATT CHRG 24-SSOP 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) |
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