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參數(shù)資料
| 型號： | LTC1729CS8-4.1 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Li-Ion Battery Charger Termination Controllers |
| 中文描述： | POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 200K |
| 代理商： | LTC1729CS8-4.1 |
7
LTC1729 Series
APPLICATIO
S I
N
FOR
ATIO
U
W
U
V
MAX
= 1V
V
MIN
= 0V
4.5V/CELL
BATTERY CLAMP
PULL-DOWN
ON
V
MAX
= 0V
V
MIN
= 0V
2.7V/CELL
V
MAX
= 0V
V
MIN
= 1V
NORMAL CHARGE
B
TRICKLE CHARGE
PRECONDITIONING
1729 F04
HOLD MODE
2.79V
T
HOLD MODE
0.2V
RESET MODE
NORMAL CHARGE
0.405V
1729 F05
The logic and timer block consists of a state machine,
oscillator and counter. The state machine will be dis-
cussed in detail in the next section. The oscillator is
internally trimmed to 131kHz. The counter is composed of
a chain of 25 flip-flops that includes self-test circuitry.
State Machine
The state machine is responsible for the following items:
1. When to start and stop the charger. The internal timer
must be initialized every time a new battery is installed
or when the input supply is applied.
2. When a battery is installed, the state machine must
determine if it is a new battery or if the previous battery
has been reinstalled.
Figure 4. BAT Voltage Operating Range
Figure 5. NTC Voltage Operating Range
When the input supply is removed in step-down charger
designs, the V
CC
pin does not drop to 0V, but is held to a
diode drop below the battery voltage. This is due to the
internal parasitic diode from the SW pin to the V
CC
pin that
is present in the LT1510, LT1511, LT1769, and the body
diode of the top MOSFET in the LT1505 charger. Removing
the input supply will result in the V
CC
pin dropping below
the UVLO threshold, thus shutting down the LTC1729 and
minimizing battery drain. Once the input supply is con-
nected, the LTC1729 resets the timers and begins another
charge cycle. There is a disconnect transistor that will
remove the OVP resistor divider from the battery when the
V
CC
voltage drops below the UVLO threshold.
RESET MODE
I
= 0
STATUS = PULL-DOWN
V
C
= PULL-DOWN
PAUSE
I
= 0
STATUS = PULL-DOWN
V
C
= PULL-DOWN
DONE
I
= 0
STATUS = OPEN
V
C
= PULL-DOWN
NO BAT
I
= 0
STATUS = OPEN
V
C
= PULL-DOWN
HOLD MODE
I
= 0
STATUS = PREVIOUS STATUS
V
C
= PULL-DOWN
PRECONDITION
I
= 16mA
STATUS = PULL-DOWN
V
C
= PULL-DOWN
t
MAX
= 1HR
V
BAT
< V
MIN
V
BAT
> V
MIN
V
BAT
> V
MAX
TIME > t
MAX
1729 F06
NOTE: FOR STATUS
PULL-DOWN = HARD:
FOR CURRENT > C/10
PULL-DOWN = 50
μ
A:
FOR CURRENT < C/10 FOR 3SEC
V
BAT
< V
MAX
FOR MORE THAN 1SEC
V
BAT
< V
MAX
FOR MORE THAN 1SEC
V
BAT
> V
MAX
FOR MORE THAN 1SEC
V
BAT
> V
MAX
FOR MORE THAN 1SEC
V
NTC
> 2.79V OR
V
NTC
< 0.405V
V
NTC
< 2.79V AND
V
NTC
> 0.405V
V
BAT
> V
MIN
V
BAT
< V
MIN
CHARGER “ON”
I
= 1.3mA
STATUS = PULL-DOWN
V
C
= OPEN
t
MAX
= 3HR
CHARGE
Figure 6. State Diagram
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|---|---|
| LTC1729CS8-8.2 | 功能描述:IC CTRLR BATT CHRGR LI-ION 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC1729CS8-8.2#PBF | 功能描述:IC CTRLR BATT CHRGR LI-ION 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC1729CS8-8.2#TR | 功能描述:IC CTRLR BATT CHRGR LI-ION 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC1729CS8-8.2#TRPBF | 功能描述:IC CTRLR BATT CHRGR LI-ION 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC1729CS8-8.4 | 功能描述:IC CTRLR BATT CHRGR LI-ION 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
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