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參數(shù)資料
| 型號： | LTC4011EFE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, 615 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 4.40 MM, PLASTIC, TSSOP-20 |
| 文件頁數(shù)： | 11/24頁 |
| 文件大小： | 228K |
| 代理商： | LTC4011EFE#PBF |
19
LTC4011
4011p
Waveforms
Sample waveforms for a standalone application during a
typical charge cycle are shown in Figure 10. Note that
these waveforms are not to scale and do not represent the
complete range of possible activity. The figure is simply
intended to allow better conceptual understanding and to
highlight the relative behavior of certain signals generated
by the LTC4011 during a typical charge cycle.
Initially, the LTC4011 is in low power shutdown as the
system operates from a heavily discharged battery. A DC
adapter is then connected such that VCC rises above 4.25V
and is 500mV above BAT. The READY output is asserted
when the LTC4011 completes charge qualification.
When the LTC4011 determines charging should begin, it
starts a precharge cycle because VCELL is less than 900mV.
As long as the temperature remains within prescribed
limits, the LTC4011 charges (TGATE switching), applying
limited current to the battery with the PWM in order to
bring the average cell voltage to 900mV.
APPLICATIO S I FOR ATIO
WU
UU
When the precharge state timer expires, the LTC4011 be-
gins fast charge if VCELL is greater than 900mV. The PWM,
charge timer and internal termination control are sus-
pended if pause is asserted (VCELL < 200mV), but all status
outputs continue to indicate charging is in progress. The
fast charge state continues until the selected voltage or
temperature termination criteria are met. Figure 10 sug-
gests termination based on T/t, which for NiMH would
be an increase of 1°C per minute.
Because NiMH charging terminated due to T/t and the
fast charge cycle had lasted more than tMAX/12 minutes,
the LTC4011 begins a top-off charge with a current of
IPROG/10. Top-off is an internally timed charge of tMAX/3
minutes with the CHRG and TOC outputs continuously
asserted.
Finally, the LTC4011 enters the automatic recharge state
where the CHRG and TOC outputs are deasserted. The
PWM is disabled but VCDIV remains asserted to monitor
VCELL. The charge timer will be reset and fast charging will
resume if VCELL drops below 1.325V. The LTC4011 enters
Figure 9. LTC4011 with MCU Interface
INFET
FAULT
CHRG
TOC
READY
VCC
TGATE
VCDIV
VCELL
LTC4011
DCIN
VRT
INTVDD
SENSE
BAT
FROM
ADAPTER
4.5V TO 34V
STATUS
TO
MCU
PAUSE
FROM
MCU
10H
10F
NiCd PACK
WITH 10k NTC
(1AHr)
TO
SYSTEM
LOAD
0.1
4011 F09
VTEMP
V+
Q1
Q2
Q3
GND
CHEM
20k
49.9k
10k
33nF
R2
68nF
30.9k
10.7k
0.1F
BGATE
PGND
TIMER
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LTC4012 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger with PowerPath Control |
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| LTC4012CUF#PBF | 功能描述:IC BATT CHRGR MC HI-EFF 20-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關(guān)文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標準包裝:4,000 系列:- 功能:燃料，電量檢測計/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2 |
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