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參數資料
| 型號： | LTC1760 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Dual Smart Battery System Manager |
| 中文描述： | 雙智能電池系統(tǒng)管理 |
| 文件頁數： | 29/44頁 |
| 文件大?。?/td> | 379K |
| 代理商： | LTC1760 |
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LTC1760
29
sn1760 1760is
High: Battery 2 not charging (AC is not present or
battery is not present).
Blinking: Battery 2 charge complete (AC is present,
battery is present and not charging).
SMBALERT is used to monitor charging status of Battery1.
Allowed valued are:
Low: Battery 1 is charging.
High: Battery 1 not charging (AC is not present or
battery is not present).
Blinking: Battery 1 charge complete (AC is present,
battery is present and not charging).
SCL is an input and is used to determine the blinking rate
of SDA and SMBALERT. Tie SCL high if blinking is not
desired. This will provide two different states to indicate
charging (output low) and not charging (output high).
6.2 Hardware Charge Inhibit
When MODE is tied to GND and V
VDDS
>V
IH_VDDS
,charging
isinhibitedandBatterySystemStateCont(CHARGING_INHIBIT)
will report a logic high.
6.3 Charging When SCL And SDA Are Low
When MODE is tied to V
CC2
and V
DDS
< V
IL_VDDS
, SDA and
SCL are not used and will not interfere with LTC1760
battery communication. This feature allows the LTC1760
to autonomously charge when SCL and SDA are not
available. This scenario might occur when SMBus Host
has powered down and is no longer pulling up on SCL and
SDA.
6.4 Charging With an SMBus Host
When Mode is tied to V
CC2
and V
VDDS
> V
IL_VDDS
, SDA and
SCL are used to communicate with the SMBus Host.
7 Battery Charger Controller
The LTC1760 charger controller uses a constant off-time,
current mode step-down architecture. During normal op-
eration, the top MOSFET is turned on each cycle when the
oscillator sets the SR latch and turned off when the main
current comparator I
CMP
resets the SR latch. While the top
MOSFET is off, the bottom MOSFET is turned on until
either the inductor current trips the current comparator
I
REV
, or the beginning of the next cycle. The oscillator uses
the equation.
t
OFF
= (V
DCIN
- V
BAT
)/(V
DCIN
f
OSC
)
to set the bottom MOSFET on time. The result is quasi-
constant frequency operation where the converter fre-
quency remains nearly constant over a wide range of
output voltages. This activity is diagrammed in Figure 4.
OPERATIOU
TGATE
BGATE
ON
ON
OFF
OFF
t
OFF
TRIP POINT SET BY I
TH
VOLTAGE
INDUCTOR
CURRENT
Figure 4.
The peak inductor current, at which I
CMP
resets the SR
latch, is controlled by the voltage on I
TH
. I
TH
is in turn
controlled by several loops, depending upon the situation
at hand. The average current control loop converts the
voltage between CSP and BAT to a representative current.
Error amp CA2 compares this current against the desired
current programmed by the I
DAC
at the I
SET
pin and adjusts
I
TH
for the desired voltage across R
SENSE
.
The voltage at BAT is divided down by an internal resistor
divider set by the V
DAC
and is used by error amp EA to
decrease I
TH
if the divider voltage is above the 0.8V
reference.
The amplifier CL1 monitors and limits the input current,
normally from the AC adapter, to a preset level (100 mV/
R
CL
). At input current limit, CL1 will decrease the I
TH
voltage and thus reduce battery charging current.
An over-voltage comparator, OV, guards against transient
overshoots (>7.5%). In this case, the top MOSFET is
turned off until the over-voltage condition is cleared. This
feature is useful for batteries which “l(fā)oad dump” them-
selves by opening their protection switch to perform
functions such as calibration or pulse-mode charging.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC1760CFW | 功能描述:IC MANAGER BATTERY DUAL 48TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學:堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-6 包裝:帶卷 (TR) |
| LTC1760CFW#PBF | 功能描述:IC MANAGER BATTERY DUAL 48TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關文件:STC3100 View All Specifications 特色產品: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: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） 供應商設備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2 |
| LTC1760CFW#PBF | 制造商:Linear Technology 功能描述:Battery Management IC 制造商:Linear Technology 功能描述:IC, BATTERY CHARGER, 4.28A, TSSOP-48 |
| LTC1760CFW#TR | 功能描述:IC MANAGER BATTERY SYS 48-TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學:堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-6 包裝:帶卷 (TR) |
| LTC1760CFW#TRPBF | 功能描述:IC MANAGER BATTERY DUAL 48TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學:堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-6 包裝:帶卷 (TR) |
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