- 您现在的位置：买卖IC网 > PDF目录15969 > LT1511ISW#PBF (Linear Technology)IC BATT CHRGR CONST I/V 3A24SOIC PDF资料下载
参数资料
| 型号： | LT1511ISW#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHRGR CONST I/V 3A24SOIC |
| 标准包装： | 32 |
| 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： | -40°C ~ 85°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： | 管件 |
LT1511
APPLICATIO N S I N FOR M ATIO N
low thermal resistance system and to act as a ground
plane for reduced EMI.
Glue-on, chip-mounted heat sinks are effective only in
moderate power applications where the PC board copper
cannot be used, or where the board size is small. They
offer very little improvement in a properly laid out multi-
layer board of reasonable size.
Higher Duty Cycle for the LT1511 Battery Charger
Maximum duty cycle for the LT1511 is typically 90%, but
this may be too low for some applications. For example, if
an 18V ± 3% adapter is used to charge ten NiMH cells, the
charger must put out 15V maximum. A total of 1.6V is lost
in the input diode, switch resistance, inductor resistance
and parasitics, so the required duty cycle is 15/16.4 =
91.4%. As it turn out, duty cycle can be extended to 93%
by restricting boost voltage to 5V instead of using V BAT as
is normally done. This lower boost voltage also reduces
power dissipation in the LT1511, so it is a win-win deci-
sion. Connect an external source of 3V to 6V at V X node in
Figure 10 with a 10 μ F C X bypass capacitor.
Even Lower Dropout
For even lower dropout and/or reducing heat on the board,
the input diode D3 should be replaced with a FET (see
Figure 11). It is pretty straightforward to connect a
P-channel FET across the input diode and connect its gate
to the battery so that the FET commutates off when the
input goes low. The problem is that the gate must be
pumped low so that the FET is fully turned on even when
the input is only a volt or two above the battery voltage.
Also there is a turn-off speed issue. The FET should turn
45
STANDARD CONNECTION
HIGH DUTY CYCLE CONNECTION
40
35
30
25
20
2-LAYER BOARD
4-LAYER BOARD
C3
0.47 μ F
D2
SW
BOOST
LT1511
SPIN
SENSE BAT
C3
0.47 μ F
D2
V X
3V TO 6V
C X
10 μ F
SW
BOOST
LT1511
SPIN
SENSE BAT
15
MEASURED FROM AIR AMBIENT
TO DIE USING COPPER LANDS
AS SHOWN ON DATA SHEET
+
V BAT
+
V BAT
10
0
5
10
15
20
25
30
35
BOARD AREA (IN 2 )
LT1511 ? F08
Figure 10. High Duty Cycle
1511 F10
Figure 8. LT1511 Thermal Resistance
HIGH DUTY CYCLE CONNECTION
110
100
90
80
NOTE: PEAK DIE TEMPERATURE WILL BE
ABOUT 10 ° C HIGHER THAN LEAD TEMPER-
ATURE AT 3A CHARGING CURRENT
2-LAYER BOARD
V IN
Q1
R X
50k
Q2
D1
C2
0.47 μ F
D2
+
SW V CC
BOOST
LT1511
70
4-LAYER BOARD
SPIN
60
50
40
0
V IN = 16V
V BAT = 8.4V
I CHRG = 3A
T A = 25 ° C
5 10
4-LAYER BOARD
WITH V BOOST = 3.3V
15 20 25 30
35
Q1 = Si4435DY
Q2 = TP0610L
V X
3V TO 6V
C X
10 μ F
SENSE
BAT
+
V BAT
BOARD AREA (IN 2 )
LT1511 ? F09
1511 F11
14
Figure 9. LT1511 Lead Temperature
Figure 11. Replacing the Input Diode
相关PDF资料 |
PDF描述 |
|---|---|
| RP15-4805SF/N | CONV DC/DC 15W 36-75VIN 05VOUT |
| EEU-FR1H821SB | CAP ALUM 820UF 50V 20% RADIAL |
| GEC12DRYS-S93 | CONN EDGECARD 24POS DIP .100 SLD |
| 415-0024-024 | CABLE MCX-RA/MCX-RA 24" 735A |
| MAX16042TP+ | IC SUPERVISOR CIRC TRPL 20TQFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1512 | 制造商:LINER 制造商全称:Linear Technology 功能描述:SEPIC Constant-Current/ Constant-Voltage Battery Charger |
| LT1512C | 制造商:LINER 制造商全称:Linear Technology 功能描述:SEPIC Constant-Current/ Constant-Voltage Battery Charger |
| LT1512CGN | 功能描述:IC BATT CHRGR CONST I/V 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:2,000 系列:Impedance Track™ 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:2.4 V ~ 2.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:带卷 (TR) 产品目录页面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名称:296-21665-2 |
| LT1512CGN#PBF | 功能描述:IC BATT CHRGR CONST I/V 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
| LT1512CGN#TR | 功能描述:IC CHARGER BATT CONST V/I 16SSOP 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) |
发布紧急采购，3分钟左右您将得到回复。