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參數(shù)資料
| 型號： | LTC1731-4.2 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Lithium-Ion Linear Battery Charger Controller(4.2V鋰離子線性電池充電器) |
| 中文描述： | 鋰離子線性電池充電控制器（4.2V的鋰離子線性電池充電器） |
| 文件頁數(shù)： | 3/8頁 |
| 文件大?。?/td> | 154K |
| 代理商： | LTC1731-4.2 |
3
LTC1731-4.2
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
SYMBOL
V
ASD
PARAMETER
Automatic Shutdown Threshold Voltage
CONDITIONS
(V
CC
– V
BAT
) High to Low
(V
CC
– V
BAT
) Low to High
V
DIS
= V
CC
– V
TIMER
Internal Pull-Up Current, No R
PROG
PROG Pin Source Current,
V
PROG
≤
5mV
R
PROG
=19.6k
V
CHRG
= 1V
I
CHRG
= 5mA
R
PROG
= 19.6k, R
SENSE
= 0.2
C
TIMER
= 0.1
μ
F
V
CLAMP
= V
CC
– V
DRV
, I
DRIVE
= 50
μ
A
MIN
30
40
TYP
54
69
MAX
90
100
0.4
UNITS
mV
mV
V
DIS
I
PROG
Voltage Mode Disable Threshold Voltage
PROG Pin Current
PROG Pin Load Regulation
PROG Pin Voltage
CHRG Pin Weak Pull-Down Current
CHRG Pin Output Low Voltage
End of Charge Indication Current Level
TIMER Accuracy
DRV Pin Clamp Voltage
G
V
2.5
μ
A
μ
A
V
μ
A
V
mA
%
G
300
V
PROG
I
CHRG
V
CHRG
I
C/10
t
TIMER
V
CLAMP
2.457
100
0.6
50
10
6.5
50
150
1.2
100
G
25
V
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
A
= 25
°
C. V
CC
= 6V unless otherwise noted.
PI
FU
CTIO
N
S
U
U
BAT (Pin 1):
Battery Sense Input. A bypass capacitor of at
least 10
μ
F is required to keep the loop stable when the
battery is not connected. A precision internal resistor
divider sets the final float potential on this pin. The resistor
divider is disconnected in sleep mode.
CHRG (Pin 2):
Open-Drain Charge Status Output. When
the battery is being charged, the CHRG pin is pulled low by
an internal N-channel MOSFET. When the charge current
drops to 10% of the full-scale current for at least 0.32
seconds, the N-channel MOSFET turns off and a 100
μ
A
current source is connected from the CHRG pin to GND.
When the timer runs out or the input supply is removed,
the current source will be disconnected and the CHRG pin
is forced into a high impedance state.
TIMER (Pin 3):
Timer Capacitor and Constant-Voltage
Mode Disable Input Pin. The timer period is set by placing
a capacitor, C
TIMER
, to GND. The timer period is t
TIMER
=
(C
TIMER
3 hours)/(0.1
μ
F). When the TIMER pin is
connected to V
CC
, the constant-voltage mode is disabled
and the chip will operate in constant-current mode only.
Short the TIMER pin to GND to disable the internal timer
function.
GND (Pin 4):
Ground.
PROG (Pin 5):
Charge Current Program and Shutdown
Input Pin. The charge current is programmed by connect-
ing a resistor, R
PROG
to ground. The charge current is I
BAT
= (V
PROG
800
)/(R
PROG
R
SENSE
). The IC can be forced
into shutdown by either floating the PROG pin or pulling it
up to V
CC
. An internal 2.5
μ
A current source will pull the pin
above the shutdown threshold voltage when the program
resistor (R
PROG
) is disconnected.
DRV (Pin 6):
Drive Output Pin for the P-Channel MOSFET
or PNP Transistor. The impedance is high at this pin,
therefore, a high gain PNP pass transistor should be used.
The DRV pin is internally clamped to 6.5V below V
CC
.
V
CC
(Pin 7):
Positive Input Supply Voltage. When V
BAT
is
within 54mV of V
CC
, the LTC1731-4.2 is forced into sleep
mode, dropping I
CC
to 7
μ
A. V
CC
ranges from 4.5V to 12V.
Bypass this pin with a 1
μ
F capacitor.
SENSE (Pin 8):
Current Sense Input. A sense resistor,
R
SENSE
, must be connected from V
CC
to the SENSE pin.
This resistor is chosen using the following equation:
R
SENSE
= (V
PROG
800
)/(R
PROG
I
BAT
)
Note 2:
The LTC1731-4.2 is guaranteed to meet performance
specifications from 0
°
C to 70
°
C. Specifications over the –40
°
C to 85
°
C
operating temperature range are assured by design, characterization and
correlation with statistical process controls. Guaranteed I grade parts are
available, consult factory.
The
G
denotes the specifications which apply over the full operating
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| LTC1731EMS8-4.1 | 功能描述:IC CTRLR BATT CHRGR LI-ION 8MSOP 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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| LTC1731EMS8-4.1#TR | 功能描述:IC CTRLR BATT CHRGR LI-ION 8MSOP 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 |
| LTC1731EMS8-4.1#TRPBF | 功能描述:IC CTRLR BATT CHRGR LI-ION 8MSOP 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 |
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