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参数资料
| 型号： | LT1769IGN |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | Constant-Current/ Constant-Voltage 2A Battery Charger with Input Current Limiting |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO28 |
| 封装： | 0.150 INCH, PLASTIC, SSOP-28 |
| 文件页数： | 14/16页 |
| 文件大小： | 214K |
| 代理商： | LT1769IGN |
14
LT1769
APPLICATIO
S I
N
FOR
ATIO
U
W
U
Figure 11. Replacing the Input Diode
CHARGE CURRENT (A)
0
L
°
C
40
50
2
1769 F09
30
20
0.5
1
1.5
70
60
NOTE: PEAK DIE TEMPERATURE
WILL BE ABOUT 15
°
C HIGHER AT
2A CHARGE CURRENT
V
IN
= 19V
V
BAT
= 12.3V
V
= 5V
2-LAYER BOARD
ROOM TEMP = 24
°
C
5 IN
2
BOARD
25 IN
2
BOARD
BOARD AREA (IN
2
)
0
45
40
35
30
25
20
15
10
15
25
1769 F08
5
10
20
30
35
T
°
C
MEASURED FROM AIR AMBIENT
TO DIE USING COPPER LANDS
AS SHOWN ON DATA SHEET
2-LAYER BOARD
4-LAYER BOARD
Figure 8. LT1769 Thermal Resistance
Figure 10. High Duty Cycle
V
IN
SW
BOOST
SPIN
SENSE
BAT
V
CC
V
X
3V TO 6V
C
X
10
μ
F
V
BAT
1769 F11
C2
0.47
μ
F
D2
D1
R
X
50k
Q2
Q1
LT1769
HIGH DUTY CYCLE CONNECTION
Q1 = Si4435DY
Q2 = TP0610L
+
+
SW
BOOST
SPIN
SENSE
BAT
V
BAT
C3
0.47
μ
F
D2
LT1769
SW
BOOST
SPIN
SENSE
BAT
V
X
3V TO 6V
C
X
10
μ
F
V
BAT
1769 F10
C3
0.47
μ
F
D2
LT1769
STANDARD CONNECTION
HIGH DUTY CYCLE CONNECTION
+
+
Battery voltage and input voltage will affect device power
dissipation, so the data sheet power calculations must be
used to extrapolate these readings to other situations.
Vias should be used to connect board layers together.
Planes under the charger area can be cut away from the
rest of the board and connected with vias to form both a
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 LT1769 Battery Charger
Maximum duty cycle for the LT1769 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 approximaly 15V. A total of 1.6V is
lost in the input diode, switch resistance, inductor resis-
tance and parasitics, so the required duty cycle is
15/16.4 = 91.4%. The 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 LT1769, 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.
Figure 9. LT1769 Lead Temperature
相关PDF资料 |
PDF描述 |
|---|---|
| LT1769 | Constant-Current/ Constant-Voltage 2A Battery Charger with Input Current Limiting |
| LT1769CGN | Constant-Current/ Constant-Voltage 2A Battery Charger with Input Current Limiting |
| LT1776C | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1776IN8 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1776CN8 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1769IGN#PBF | 功能描述:IC CHARGER BATT CONST V/I 28SSOP 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) |
| LT1769IGN#TR | 功能描述:IC CHARGER BATT CONST V/I 28SSOP 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) |
| LT1769IGN#TRPBF | 功能描述:IC CHARGER BATT CONST V/I 28SSOP 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) |
| LT1775CQ5 | 制造商:Linear Technology 功能描述: |
| LT1776 | 制造商:LINER 制造商全称:Linear Technology 功能描述:50mA, 3V to 80V Low Dropout Micropower Linear Regulator |
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