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参数资料
| 型号： | LT3652EDD#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A BATTERY CHARGE CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO12 |
| 封装： | 3 X 3 MM, LEAD FREE, PLASTIC, DFN-12 |
| 文件页数： | 11/26页 |
| 文件大小： | 253K |
| 代理商： | LT3652EDD#TRPBF |
LT3652
19
3652fc
Status Pins
The LT3652 reports charger status through two open
collector outputs, the CHRG and FAULT pins. These pins
can accept voltages as high as VIN, and can sink up to
10mA when enabled.
The CHRG pin indicates that the charger is delivering
current at greater that a C/10 rate, or 1/10th of the pro-
grammed maximum charge current. The FAULT pin signals
bad battery and NTC faults. These pins are binary coded,
and signal following the table below, where ON indicates
pin pulled low, and OFF indicates pin high-impedance:
STATUS PINS STATE
CHARGER STATUS
CHRG
FAULT
OFF
Not Charging — Standby or Shutdown Mode
OFF
ON
Bad Battery Fault (Precondition Timeout / EOC
Failure)
ON
OFF
Normal Charging at C/10 or Greater
ON
NTC Fault (Pause)
If the battery is removed from an LT3652 charger that is
configured for C/10 termination, a sawtooth waveform
of approximately 100mV appears at the charger output,
due to cycling between termination and recharge events,
This cycling results in pulsing at the CHRG output. An
LED connected to this pin will exhibit a blinking pattern,
indicating to the user that a battery is not present. The
frequency of this blinking pattern is dependent on the
output capacitance.
C/10 Termination
The LT3652 supports a low-current based termination
scheme, where a battery charge cycle terminates when the
current output from the charger falls to below one-tenth
of the maximum current, as programmed with RSENSE.
The C/10 threshold current corresponds to 10mV across
RSENSE. This termination mode is engaged by shorting
the TIMER pin to ground.
APPLICATIONS INFORMATION
When C/10 termination is used, a LT3652 charger will
source battery charge current as long as the average
current level remains above the C/10 threshold. As the
full-charge float voltage is achieved, the charge current
falls until the C/10 threshold is reached, at which time the
charger terminates and the LT3652 enters standby mode.
The CHRG status pin follows the charger cycle, and is high
impedance when the charger is not actively charging.
When VBAT drops below 97.5% of the full-charged float
voltage, whether by battery loading or replacement of the
battery, the charger automatically re-engages and starts
charging.
There is no provision for bad battery detection if C/10
termination is used.
Timer Termination
The LT3652 supports a timer based termination scheme, in
which a battery charge cycle is terminated after a specific
amount of time elapses. Timer termination is engaged
when a capacitor (CTIMER) is connected from the TIMER
pin to ground. The timer cycle EOC (TEOC) occurs based
on CTIMER following the relation:
CTIMER = TEOC 2.27 x 10–7
(Hours)
Timer EOC is typically set to 3 hours, which requires a
0.68μF capacitor.
The CHRG status pin continues to signal charging at a C/10
rate, regardless of what termination scheme is used. When
timer termination is used, the CHRG status pin is pulled
low during a charging cycle until the charger output cur-
rent falls below the C/10 threshold. The charger continues
to top-off the battery until timer EOC, when the LT3652
terminates the charging cycle and enters standby mode.
Termination at the end of the timer cycle only occurs if
the charging cycle was successful. A successful charge
cycle is when the battery is charged to within 2.5% of the
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3652EMSE | 制造商:LINER 制造商全称:Linear Technology 功能描述:Power Tracking 2A Battery Charger for Solar Power |
| LT3652EMSE#PBF | 功能描述:IC BATTERY CHARGER SOLAR 12MSOP 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) |
| LT3652EMSE#PBF | 制造商:Linear Technology 功能描述:BATTERY CHARGER FOR SOLAR POWER 制造商:Linear Technology 功能描述:IC, BATTERY CHARGER, 2A, MSOP-12 |
| LT3652EMSE#TRPBF | 功能描述:IC BATT CHARGER SOLAR 2A 12MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LT3652EMSEPBF | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion 2A 4.2V MSOP12EP |
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