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参数资料
| 型号： | LT1571EGN-5#TR |
| 厂商： | Linear Technology |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATT CONST V/I 16SSOP |
| 标准包装： | 2,500 |
| 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 ~ 26 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 带卷 (TR) |
LT1571 Series
APPLICATIO S I FOR ATIO
instead of V BAT (see Figure 8). The optimum boost voltage
SW
(V X ) is from 3V to 6V.
Then,
L1
C1
D2
LT1571
BOOST
P DRIVER =
? ? V X ? ?
( I BAT )( V BAT )( V X ) ? 1 + 30 ?
55 ( V IN )
V X
3V TO 6V
I VX
+
10 μ F
SENSE
1571 F08
For example, V X = 3.3V,
Figure 8. Lower V BOOST
P DRIVER =
( 1 . 2 A )( 8 . 4 V )( 3 . 3 V ) ? ? ? 1 + 3 30 3 . V ? ? ?
55 ( 15 V )
= 0 . 045 W
60
55
50
2-LAYER BOARD
The average I VX required is:
45
= = 14 mA
P DRIVER
V X
0 . 045 W
3 . 3 V
40
35
4-LAYER BOARD
Total board area becomes an important factor when the
area of the board drops below about 20 square inches. The
30
25
GN16, MEASURED FROM AIR AMBIENT
TO DIE USING COPPER LANDS AS
SHOWN ON DATA SHEET
graph in Figure 9 shows thermal resistance vs board area
for 2-layer and 4-layer boards. Note that 4-layer boards
0
5
10 15 20 25
BOARD AREA (IN 2 )
30 35
1571 F09
have significantly lower thermal resistance, but both types
show a rapid increase for reduced board areas. Figure 10
shows actual measured lead temperature for chargers
Figure 9. LT1571 Thermal Resistance
operating at full current. 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.
90
80
70
60
50
40
30
20
NOTE: PEAK DIE TEMPERATURE WILL BE
ABOUT 10 ° C HIGHER THAN LEAD TEMPER-
ATURE AT 1.3A CHARGING CURRENT
2-LAYER BOARD
4-LAYER BOARD
I CHRG = 1.3A
V IN = 16V
V BAT = 8.4V
V BOOST = V BAT
T A = 25 ° C
0
5
10
15
20
25
30
35
Higher Duty Cycle
BOARD AREA (IN 2 )
1571 F10
Maximum duty cycle for the LT1571-1/LT1571-2 is typi-
cally 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 approximately 15V.
A total of 1.6V is lost in the input diode, switch resistance,
inductor resistance and parasitics so the required duty
Figure 10. LT1571 Lead Temperature
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 V X (see
Figure 8) also reduces power dissipation in the LT1571.
13
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相关代理商/技术参数 |
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| LT1572 | 制造商:LINER 制造商全称:Linear Technology 功能描述:100kHz, 1.25A Switching Regulator with Catch Diode |
| LT1572CS | 功能描述:IC REG MULTI CONFIG 1.25A 16SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1572CS#PBF | 功能描述:IC REG MULTI CONFIG 1.25A 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1572CS#TR | 功能描述:IC REG MULTI CONFIG 1.25A 16SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1572CS#TRPBF | 功能描述:IC REG MULTI CONFIG 1.25A 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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