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参数资料
| 型号： | LTC3559EUD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | IC USB CHARGER 16-QFN |
| 标准包装： | 121 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 4.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 包装： | 管件 |
| 产品目录页面： | 1341 (CN2011-ZH PDF) |
LTC3559/LTC3559-1
APPLICATIONS INFORMATION
In any mode, the actual battery current can be determined
by monitoring the PROG pin voltage and using the follow-
ing equation:
charge current has dropped to below 10% of the full-scale
current, the CHRG pin is released (high impedance). If a
fault occurs after the CHRG pin is released, the pin re-
I BAT =
PROG
R PROG
? 800
mains high impedance. However, if a fault occurs before
the CHRG pin is released, the pin is switched at 35kHz.
While switching, its duty cycle is modulated between a high
and low value at a very low frequency. The low and high
Thermal Regulation
To prevent thermal damage to the IC or surrounding
components, an internal thermal feedback loop will auto-
matically decrease the programmed charge current if the
die temperature rises to approximately 115°C. Thermal
regulation protects the battery charger from excessive
temperature due to high power operation or high ambient
thermal conditions and allows the user to push the limits
of the power handling capability with a given circuit board
duty cycles are disparate enough to make an LED appear
to be on or off thus giving the appearance of “blinking”.
Each of the two faults has its own unique “blink” rate for
human recognition as well as two unique duty cycles for
microprocessor recognition.
Table 1 illustrates the four possible states of the CHRG
pin when the battery charger is active.
Table 1. CHRG Output Pin
design without risk of damaging the LTC3559/LTC3559-1
or external components. The bene?t of the LTC3559/
LTC3559-1 battery charger thermal regulation loop is that
STATUS
Charging
FREQUENCY
0Hz
MODULATION
(BLINK)
FREQUENCY
0 Hz (Lo-Z)
DUTY CYCLE
100%
NTC Fault
Bad Battery
charge current can be set according to actual conditions
rather than worst-case conditions with the assurance that
the battery charger will automatically reduce the current
in worst-case conditions.
Charge Status Indication
The CHRG pin indicates the status of the battery charger.
Four possible states are represented by CHRG : charging,
not charging, unresponsive battery and battery temperature
out of range.
The signal at the CHRG pin can be easily recognized as one
of the above four states by either a human or a micropro-
cessor. The CHRG pin, which is an open-drain output, can
drive an indicator LED through a current limiting resistor
for human interfacing, or simply a pull-up resistor for
microprocessor interfacing.
To make the CHRG pin easily recognized by both humans
and microprocessors, the pin is either low for charging,
high for not charging, or it is switched at high frequency
(35kHz) to indicate the two possible faults: unresponsive
battery and battery temperature out of range.
When charging begins, CHRG is pulled low and remains
IBAT < C/10 0Hz 0 Hz (Hi-Z) 0%
35kHz 1.5Hz at 50% 6.25% to 93.75%
35kHz 6.1Hz at 50% 12.5% to 87.5%
An NTC fault is represented by a 35kHz pulse train whose
duty cycle varies between 6.25% and 93.75% at a 1.5Hz
rate. A human will easily recognize the 1.5Hz rate as a
“slow” blinking which indicates the out of range battery
temperature while a microprocessor will be able to decode
either the 6.25% or 93.75% duty cycles as an NTC fault.
If a battery is found to be unresponsive to charging (i.e.,
its voltage remains below V TRKL for over 1/2 hour), the
CHRG pin gives the battery fault indication. For this fault,
a human would easily recognize the frantic 6.1Hz “fast”
blinking of the LED while a microprocessor would be able
to decode either the 12.5% or 87.5% duty cycles as a bad
battery fault.
Although very improbable, it is possible that a duty cycle
reading could be taken at the bright-dim transition (low
duty cycle to high duty cycle). When this happens the
duty cycle reading will be precisely 50%. If the duty cycle
reading is 50%, system software should disqualify it and
take a new duty cycle reading.
low for the duration of a normal charge cycle. When the
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3559EUD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Linear USB Battery Charger with Dual Buck Regulators |
| LTC3560 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.25MHz, 800mA Synchronous Step-Down Regulator in ThinSOT |
| LTC3560E | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.25MHz, 800mA Synchronous Step-Down Regulator in ThinSOT |
| LTC3560ES6 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.25MHz, 800mA Synchronous Step-Down Regulator in ThinSOT |
| LTC3560ES6#PBF | 制造商:Linear Technology 功能描述:2.1 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
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