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参数资料
| 型号： | LT1511CSW#TR |
| 厂商： | Linear Technology |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATT CONST V/I 24SOIC |
| 标准包装： | 1,000 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子，镍镉，镍氢 |
| 电源电压： | 6 V ~ 28 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC |
| 包装： | 带卷 (TR) |
LT1511
APPLICATIO N S I N FOR M ATIO N
I BAT
R S3
200 ?
SENSE
R1 =
( 2.465 )( 4000 )
I LOW
R2 =
( 2.465 )( 4000 )
I HI ? I LOW
R S1
0.033 ?
R S2
200 ?
LT1511
BAT
All battery chargers with fast charge rates require some
means to detect full charge state in the battery to terminate
the high charging current. NiCd batteries are typically
R1*
R4
–
V BAT
BAT
C1
1.6k 0.1 μ F
R2 D2
3
2
ADAPTER
OUTPUT 3.3V OR 5V
D1
1N4148
8 470k
7
LT1011
+ 4
1
NEGATIVE EDGE
TO TIMER
charged at high current until temperature rise or battery
voltage decrease is detected as an indication of near full
charge. The charging current is then reduced to a much
lower value and maintained as a constant trickle charge.
An intermediate “top off” current may be used for a fixed
time period to reduce 100% charge time.
R1(V BAT )
≈ 400mA
(560k + 430k)(0.033 ? )
560k
R3
430k
1N4148
* TRIP CURRENT =
(R2 + R3)(R S1 )
(1.6k)(8.4V)
=
NiMH batteries are similar in chemistry to NiCd but have
two differences related to charging. First, the inflection
characteristic in battery voltage as full charge is ap-
proached is not nearly as pronounced. This makes it more
1511 ? F04
Figure 5. Current Comparator for Initiating Float Time Out
Nickel-Cadmium and Nickel-Metal-Hydride Charging
The circuit in the 3A Lithium Battery Charger (Figure 1) can
be modified to charge NiCd or NiMH batteries. For ex-
ample, 2-level charging is needed; 2A when Q1 is on and
200mA when Q1 is off.
LT1511
PROG
difficult to use dV/dt as an indicator of full charge, and
change of temperature is more often used with a tempera-
ture sensor in the battery pack. Secondly, constant trickle
charge may not be recommended. Instead, a moderate
level of current is used on a pulse basis ( ≈ 1% to 5% duty
cycle) with the time-averaged value substituting for a
constant low trickle. Please contact the Linear Technology
Applications Department about charge termination cir-
cuits.
If overvoltage protection is needed, R3 and R4 should be
calculated according to the procedure described in Lithium-
Ion Charging section. The OVP pin should be grounded if
not used.
1k
R1
49.3k
R2
5.49k
When a microprocessor DAC output is used to control
charging current, it must be capable of sinking current at a
0.33 μ F
Q1
compliance up to 2.5V if connected directly to the PROG pin.
1511 ? F05
Figure 6. 2-Level Charging
For 2A full current, the current sense resistor (R S1 ) should
be increased to 0.05 ? so that enough signal (10mV) will
be across R S1 at 0.2A trickle charge to keep charging
current accurate.
For a 2-level charger, R1 and R2 are found from;
12
Thermal Calculations
If the LT1511 is used for charging currents above 1.5A, a
thermal calculation should be done to ensure that junction
temperature will not exceed 125 ° C. Power dissipation in
the IC is caused by bias and driver current, switch resis-
tance and switch transition losses. The SO wide package,
with a thermal resistance of 30 ° C/W, can provide a full 3A
charging current in many situations. A graph is shown in
the Typical Performance Characteristics section.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1511ISW | 功能描述:IC BATT CHRGR CONST I/V 3A24SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LT1511ISW#PBF | 功能描述:IC BATT CHRGR CONST I/V 3A24SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LT1511ISW#TR | 功能描述:IC CHARGER BATT CONST V/I 24SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LT1511ISW#TRPBF | 功能描述:IC BATT CHRGR CONST I/V 3A24SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LT1512 | 制造商:LINER 制造商全称:Linear Technology 功能描述:SEPIC Constant-Current/ Constant-Voltage Battery Charger |
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