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| 型号： | LT1512CN8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHRGR CONST I/V 8-DIP |
| 标准包装： | 50 |
| 功能： | 充电管理 |
| 电池化学： | 所有电池类型 |
| 电源电压： | 2.7 V ~ 25 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
| 产品目录页面： | 1340 (CN2011-ZH PDF) |
LT1512
APPLICATIONS INFORMATION
especially low. RMS ripple current in the input capacitor is
less than 0.1A with L = 33μH and less than 0.2A with L =
15μH. A low ESR 22μF, 25V solid tantalum capacitor (AVX
type TPS or Sprague type 593D) is adequate for most appli-
cations with the following caveat. Solid tantalum capacitors
can be destroyed with a very high turn-on surge current
such as would be generated if a low impedance input source
were “hot switched” to the charger input. If this condition
can occur, the input capacitor should have the highest pos-
sible voltage rating, at least twice the surge input voltage if
possible. Consult with the capacitor manufacturer before
a ?nal choice is made. A 2.2μF ceramic capacitor such as
the one used for the coupling capacitor can also be used.
These capacitors do not have a turn-on surge limitation.
The input capacitor must be connected directly to the V IN
pin and the ground plane close to the LT1512.
Output Capacitor
It is assumed as a worst case that all the switching out-
forces all the ripple current into the output capacitor. Total
RMS current into the capacitor has a maximum value of
about 0.5A, and this is handled with a 22μF, 25V capacitor
shown in Figure 1. This is an AVX type TPS or Sprague
type 593D surface mount solid tantalum unit intended
for switching applications. Do not substitute other types
without ensuring that they have adequate ripple current
ratings. See Input Capacitor section for details of surge
limitation on solid tantalum capacitors if the battery may
be “hot switched” to the output of the charger.
Coupling Capacitor
C2 in Figure 1 is the coupling capacitor that allows a SEPIC
converter topology to work with input voltages either
higher or lower than the battery voltage. DC bias on the
capacitor is equal to input voltage. RMS ripple current
in the coupling capacitor has a maximum value of about
0.5A at full charging current. A conservative formula to
calculate this is:
put ripple current from the battery charger could ?ow in
the output capacitor. This is a desirable situation if it is
necessary to have very low switching ripple current in
I COUP ( RMS ) =
I CHRG ( V IN + V BAT )(1 .1 )
2 ( V IN )
the battery itself. Ferrite beads or line chokes are often
inserted in series with the battery leads to eliminate high
frequency currents that could create EMI problems. This
(1.1 is a fudge factor to account for inductor ripple current
and other losses)
V IN
1
4
R4
GND
+V IN
L1A
2 WINDING
INDUCTOR
L1B
R3
R1
4
L1B
3
C4 R2
2
3
D1
C2
1
L1A
2
C3
D1
S/S
C2B C2A
V BATT
+
C1
C3
+
R5
C5
GND
U1
C1
V BATT
GND
1512 F04a
R1 R2
R5
C5
C4
R3
R4
a. Double-Sided (Vias Connect to the Backside of Ground Plane. Dash
Lines Indicate Interconnects on Backside. Demo Board Uses This
Layout, Except that R5 Has Been Added to Increase Phase Margin)
b. Single-Sided Alternative Layout
S/S
1512 F04b
Figure 4. LT1512 Suggested Layouts for Critical Thermal and Electrical Paths
1512fa
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1512CS8 | 功能描述:IC BATT CHRGR CONST I/V 8-SOIC 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) |
| LT1512CS8#PBF | 功能描述:IC BATT CHRGR CONST I/V 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LT1512CS8#TR | 功能描述:IC CHARGER BATT CONST V/I 8SOIC 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) |
| LT1512CS8#TRPBF | 功能描述:IC BATT CHRGR CONST I/V 8-SOIC 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) |
| LT1512CS8PBF | 制造商:Linear Technology 功能描述:LT1512CS8PBF |
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