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| 型号： | LT1769CGN#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHARGER CONST I/V 28SSOP |
| 标准包装： | 49 |
| 功能： | 充电管理 |
| 电池化学： | 铅酸，锂离子，镍镉，镍氢 |
| 电源电压： | 8 V ~ 25 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 管件 |
| 产品目录页面： | 1340 (CN2011-ZH PDF) |
LT1769
APPLICATIO N S I N FOR M ATIO N
45
STANDARD CONNECTION
HIGH DUTY CYCLE CONNECTION
40
35
30
C3
0.47 μ F
D2
SW
BOOST
LT1769
SPIN
C3
0.47 μ F
D2
SW
BOOST
LT1769
SPIN
25
20
15
2-LAYER BOARD
4-LAYER BOARD
MEASURED FROM AIR AMBIENT
TO DIE USING COPPER LANDS
AS SHOWN ON DATA SHEET
SENSE
BAT
+
V X
3V TO 6V
C X
10 μ F
V BAT
SENSE
BAT
+
V BAT
10
0
5
10
15
20
25
30
35
BOARD AREA (IN 2 )
1769 F08
1769 F10
Figure 10. High Duty Cycle
Figure 8. LT1769 Thermal Resistance
HIGH DUTY CYCLE CONNECTION
70
NOTE: PEAK DIE TEMPERATURE
WILL BE ABOUT 15 ° C HIGHER AT
V IN
Q1
+
60
50
40
30
2A CHARGE CURRENT
V IN = 19V
V BAT = 12.3V
V BOOST = 5V
2-LAYER BOARD
ROOM TEMP = 24 ° C
5 IN 2 BOARD
25 IN 2 BOARD
R X
50k
Q1 = Si4435DY
Q2 = TP0610L
Q2
D1
C2
0.47 μ F
D2
V X
3V TO 6V
C X
10 μ F
SW V CC
BOOST
LT1769
SPIN
SENSE BAT
20
0
0.5
1
1.5
2
+
V BAT
CHARGE CURRENT (A)
1769 F09
1769 F11
Figure 9. LT1769 Lead Temperature
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
decision. Connect an external source of 3V to 6V at V X
node in Figure 10 with a 10 μ F C X bypass capacitor.
Lower Dropout Voltage
For even lower dropout and/or reducing heat on the board,
the input diode D3 can be replaced with a FET (see Figure
11). Connect a P-channel FET in place of the input diode
Figure 11. Replacing the Input Diode
with its gate connected to the battery causing the FET to
turn off when the input voltage 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 off instantly when the input is dead
shorted to avoid large current surges from the battery
back through the charger into the FET. Gate capacitance
slows turn-off, so a small P-channel (Q2) is added to
discharge the gate capacitance quickly in the event of an
input short. The Q2 body diode creates the necessary
pumping action to keep the gate of Q1 low during normal
operation. Note that Q1 and Q2 have a V GS spec limit of
20V. This restricts V IN to a maximum of 20V. For low
dropout operation with V IN > 20V consult factory.
1769fa
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1769IFE | 功能描述:IC BATT CHRGR CNSTNT I/V 20TSSOP 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) |
| LT1769IFE#PBF | 功能描述:IC BATT CHRGR CNSTNT I/V 20TSSOP 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) |
| LT1769IFE#TR | 功能描述:IC BATT CHRGR CNSTNT I/V 20TSSOP 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) |
| LT1769IFE#TRPBF | 功能描述:IC BATT CHRGR CNSTNT I/V 20TSSOP 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 | 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) |
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