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參數(shù)資料
| 型號： | LTC4006EGN-2 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 4A, High Efficiency, Standalone Li-Ion Battery Charger |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大?。?/td> | 241K |
| 代理商： | LTC4006EGN-2 |
12
LTC4007
4007i
APPLICATIOU
Battery Detection
It is generally not good practice to connect a battery while
the charger is running. The timer is in an unknown state
and the charger could provide a large surge current into
the battery for a brief time. The Figure 5 circuit keeps the
charger shut down and the timer reset while a battery is not
connected.
W
U
U
increased to reduce the ripple caused by the R
PROG
switching. The compensation capacitor at ITH will prob-
ably need to be increased also to improve stability and
prevent large overshoot currents during start-up condi-
tions. Charging current will be proportional to the duty
cycle of the switch with full current at 100% duty cycle and
zero current when Q1 is off.
Maintaining C/10 Accuracy
The C/10 comparator threshold that drives the FLAG pin
has a fixed threshold of approximately V
PROG
= 400mV.
This threshold works well when R
PROG
is 26.7k, but will
not yield a 10% charging current indication if R
PROG
is a
different value. There are situations where a standard
value of R
SENSE
will not allow the desired value of charging
current when using the preferred R
PROG
value. In these
cases, where the full-scale voltage across R
SENSE
is within
±
20mV of the 100mV full-scale target, the input resistors
connected to CSP and BAT can be adjusted to provide the
desired maximum programming current as well as the
correct FLAG trip point.
For example, the desired max charging current is 2.5A but
the best R
SENSE
value is 0.033
. In this case, the voltage
across R
SENSE
at maximum charging current is only
82.5mV, normally R
PROG
would be 30.1k but the nominal
FLAG trip point is only 5% of maximum charging current.
If the input resistors are reduced by the same amount as
the full-scale voltage is reduced then, R4 = R5 = 2.49k and
R
PROG
= 26.7k, the maximum charging current is still 2.5A
but the FLAG trip point is maintained at 10% of full scale.
There are other effects to consider. The voltage across the
current comparator is scaled to obtain the same values as
the 100mV sense voltage target, but the input referred
1
DCIN
LTC4007
ADAPTER
POWER
SWITCH CLOSED
WHEN BATTERY
CONNECTED
24 SHDN
4007 F05
Figure 5
Charger Current Programming
The basic formula for charging current is:
I
V
k
R
V
R
CHARGE MAX
REF
PROG
SENSE
(
)
/
–0 035
=
3
V
REF
= 1.19V
This leaves two degrees of freedom: R
SENSE
and R
PROG
.
The 3k input resistors must not be altered since internal
currents and voltages are trimmed for this value. Pick
R
SENSE
by setting the average voltage between C
SP
and
BAT to be close to 100mV during maximum charger
current. Then R
PROG
can be determined by solving the
above equation for R
PROG
.
R
V
k
R
I
V
PROG
REF
SENSE
CHARGE MAX
=
+
.
(
)
3
0 035
Table 2. Recommended R
SNS
and R
PROG
Resistor Values
I
MAX
(A)
R
SENSE
(
) 1%
1.0
0.100
2.0
0.050
3.0
0.033
4.0
0.025
R
SENSE
(W)
0.25
0.25
0.5
0.5
R
PROG
(k
) 1%
26.7
26.7
26.7
26.7
Charging current can be programmed by pulse width
modulating R
PROG
with a switch Q1 to R
PROG
at a fre-
quency higher than a few kHz (Figure 6). C
PROG
must be
Figure 6. PWM Current Programming
R
Z
102k
C
PROG
4007 F06
PROG
11
LTC4007
Q1
2N7002
R
PROG
0V
5V
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4006EGN-2#PBF | 功能描述:IC CHARGER BATTERY 4A 16-SSOP 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 |
| LTC4006EGN-2#TR | 功能描述:IC CHARGER BATTERY 4A 16-SSOP 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) |
| LTC4006EGN-2#TRPBF | 功能描述:IC CHARGER BATTERY 4A 16-SSOP 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) |
| LTC4006EGN-4 | 功能描述:IC CHARGER BATTERY 4A 16-SSOP 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) |
| LTC4006EGN-4#PBF | 功能描述:IC CHARGER BATTERY 4A 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:2,000 系列:Impedance Track™ 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:2.4 V ~ 2.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:20-TSSOP 包裝:帶卷 (TR) 產品目錄頁面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名稱:296-21665-2 |
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