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参数资料
| 型号： | LT3652HVIMSE#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, PDSO12 |
| 封装： | LEAD FREE, PLASTIC, MSOP-12 |
| 文件页数： | 3/24页 |
| 文件大小： | 250K |
| 代理商： | LT3652HVIMSE#PBF |
LT3652HV
11
3652hvf
APPLICATIONS INFORMATION
stant-current (CC) mode, which corresponds to 100mV
across RSENSE. The ITH voltage is pulled down to reduce
this maximum charge current should the voltage on the
VIN_REG pin falls below 2.7V (VIN_REG(TH)) or the die tem-
perature approaches 125°C.
If the voltage on the VFB pin is below 2.3V (VFB(PRE)),
the LT3652HV engages precondition mode. During the
precondition interval, the charger continues to operate in
constant-current mode, but the maximum charge current
is reduced to 15% of the maximum programmed value
as set by RSENSE.
When the charger output voltage approaches the float volt-
age, or the voltage on the VFBpinapproaches3.3V(VFB(FLT)),
the charger transitions into constant-voltage (CV) mode
and charge current is reduced from the maximum value.
As this occurs, the ITH voltage falls from the limit clamp
and servos to lower voltages. The IC monitors the ITH volt-
age as it is reduced, and detection of C/10 charge current
is achieved when ITH = 0.1V. If the charger is configured
for C/10 termination, this threshold is used to terminate
the charge cycle. Once the charge cycle is terminated,
the CHRG status pin becomes high-impedance and the
charger enters low-current standby mode.
The LT3652HV contains an internal charge cycle timer that
terminates a successful charge cycle after a programmed
amount of time. This timer is typically programmed to
achieve end-of-cycle (EOC) in 3 hours, but can be con-
figured for any amount of time by setting an appropriate
timing capacitor value (CTIMER). When timer termination
is used, the charge cycle does not terminate when C/10
is achieved. Because the CHRG status pin responds to
the C/10 current level, the IC will indicate a fully-charged
battery status, but the charger continues to source low
currents into the battery until the programmed EOC time
has elapsed, at which time the charge cycle will terminate.
At EOC when the charging cycle terminates, if the battery did
not achieve at least 97.5% of the full float voltage, charging
is deemed unsuccessful, the LT3652HV re-initiates, and
charging continues for another full timer cycle.
Use of the timer function also enables bad-battery detec-
tion. This fault condition is achieved if the battery does
not respond to preconditioning, such that the charger
remains in (or enters) precondition mode after 1/8th of
the programmed charge cycle time. A bad battery fault
halts the charging cycle, the CHRG status pin goes high-
impedance, and the FAULT pin is pulled low.
When the LT3652HV terminates a charging cycle, whether
through C/10 detection or by reaching timer EOC, the
average current mode analog loop remains active, but
the internal float voltage reference is reduced by 2.5%.
Because the voltage on a successfully charged battery is
at the full float voltage, the voltage error amp detects an
over-voltage condition and ITH is pulled low. When the
voltage error amp output drops below 0.3V, the IC enters
standby mode, where most of the internal circuitry is dis-
abled, and the VIN bias current is reduced to 85μA. When
the voltage on the VFB pin drops below the reduced float
reference level, the output of the voltage error amp will
climb, at which point the IC comes out of standby mode
and a new charging cycle is initiated.
VIN Input Supply
The LT3652HV is biased through a reverse-current block-
ing element from the charger input supply to the VIN pin.
This supply provides large switched currents, so a high-
quality, low ESR decoupling capacitor is recommended
to minimize voltage glitches on VIN. The VIN decoupling
capacitor (CVIN) absorbs all input switching ripple current
in the charger, so it must have an adequate ripple current
rating. RMS ripple current (ICVIN(RMS)) is:
ICVIN(RMS)ICHG(MAX)(VBAT /VIN)([VIN/VBAT]–1)1/2,
where ICHG(MAX) is the maximum average charge current
(100mV/RSENSE). The above relation has a maximum at
VIN = 2 VBAT, where:
ICVIN(RMS) = ICHG(MAX)/2.
The simple worst-case of ICHG(MAX) is commonly
used for design.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3652HVIMSE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Power Tracking 2A Battery Charger |
| LT3652IDD | 制造商:LINER 制造商全称:Linear Technology 功能描述:Power Tracking 2A Battery Charger for Solar Power |
| LT3652IDD#PBF | 功能描述:IC BATTERY CHARGER 2A 12DFN 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) |
| LT3652IDD#TRPBF | 功能描述:IC BATTERY CHARGER 2A 12DFN 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) |
| LT3652IDDPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Power Tracking 2A Battery Charger for Solar Power |
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