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| 型号： | LTC4100EG#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/30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
SafetySignal sensing is accomplished by a state machine
that reconfigures the switches of Figure 4 using THA_SELB
and THB_SELB, a selectable reference generator, and two
comparators. This circuit has two modes of operation
based upon whether AC is present.
When AC is present, the LTC4100 samples the value of
the SafetySignal and updates the ChargerStatus register
approximately every 32ms. The state machine successively
samples the SafetySignal value starting with the RES_OR
≥ RES_COLD threshold, then RES_C0LD ≥ RES_IDEAL
threshold, RES_IDEAL ≥ RES_HOT threshold, and finally
the RES_HOT ≥ RES_UR threshold. Once the SafetySignal
range is determined, the lower value thresholds are
not sampled. The SafetySignal decoder block uses the
previously determined SafetySignal value to provide the
appropriate adjustment in threshold to add hysteresis.
The R THB resistor value is used to measure the RES_OR
≥ RES_COLD and RES_COLD ≥ RES_IDEAL thresholds by
connecting the THB pin to V DD and measuring the voltage
resultant on the THA pin. The R THA resistor value is used
to measure the RES_IDEAL ≥ RES_HOT and RES_HOT ≥
RES_UR thresholds by connecting the THA pin to V DD and
measuring the voltage resultant on the THB pin.
The SafetySignal decoder block uses a voltage divider
network between V DD and GND to determine SafetySig-
nal range thresholds. Since the THA and THB inputs are
sequentially connected to V DD , this provides V DD noise
immunity during SafetySignal measurement.
When AC power is not available the SafetySignal block
supports the following low power operating features:
1. The SafetySignal is sampled every 250ms or less,
instead of 32ms.
2. A full SafetySignal status is sampled every 30s or less,
instead of every 32ms.
The SafetySignal impedance is interpreted according to
Table 4.
Table 4. SafetySignal State Ranges
SafetySignal CHARGE STATUS BITS DESCRIPTION
RESISTANCE
0Ω to 500Ω RES_UR Underrange
RES_HOT
BATTERY_PRESENT
500Ω to 3kΩ RES_HOT Hot
BATTERY_PRESENT
3kΩ to 30kΩ BATTERY_PRESENT Ideal
30kΩ to 100kΩ RES_COLD Cold
BATTERY_PRESENT
Above 100kΩ RES_OR RES_COLD Overrange
Note: The underrange detection scheme is a very important feature of the
LTC4100. The R THA /R SafetySignal divider trip point of 0.333 ? V DD (1V) is
well above the 0.047 ? V DD (140mV) threshold of a system using a 10k
pull-up. A system using a 10k pull-up would not be able to resolve the
important underrange to hot transition point with a modest 100mV of
ground offset between battery and SafetySignal detection circuitry. Such
offsets are anticipated when charging at normal current levels.
The required values for R THA and R THB are shown in
Table 5.
Table 5. SafetySignal External Resistor Values
EXTERNAL RESISTOR VALUE (Ω)
R THA 1130 ±1%
R THB 54.9k ±1%
C SS represents the capacitance between the SafetySignal
and GND. C SS may be added to provide additional noise
immunity from transients in the application. C SS cannot
exceed 1nF if the LTC4100 is to properly sense the value
of R SafetySignal .
18
For more information www.linear.com/LTC4100
4100fc
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| LTC4100EGTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Smart Battery Charger Controller |
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| 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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