- 您现在的位置：买卖IC网 > PDF目录15996 > LT1571EGN-5#TRPBF (Linear Technology)IC CHARGER BATT CONST V/I 16SSOP PDF资料下载
参数资料
| 型号： | LT1571EGN-5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/16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
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 with its gate connected to the battery (SENSE pin)
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-FET (Q2) dis-
charges the gate capacitance quickly in the event of an
input short. The body diode of Q2 creates the necessary
pumping action to keep the gate of Q1 low during normal
operation.
Q1
Layout Considerations
Switch rise and fall times are under 10ns for maximum
efficiency. To minimize radiation, the catch diode, SW pin
and input bypass capacitor leads should be kept as short
as possible. A ground plane should be used under the
switching circuitry to prevent interplane coupling and to
act as a thermal spreading path. All ground pins should be
connected to expand traces for low thermal resistance.
The fast-switching high current ground path including the
switch, catch diode and input capacitor should be kept
very short. Catch diode and input capacitor should be
close to the chip and terminated to the same point. This
path contains nanosecond rise and fall times with several
amps of current. The other paths contain only DC and /or
200kHz or 500kHz triwave and are less critical. Figure 12
indicates the high speed, high current switching path.
Figure 13 shows critical path layout.
V IN
+
R X
50k
Q2
D1
L1
C3
V CC
SW
LT1571
BOOST
SWITCH NODE
L1
V BAT
D2
V X
3V TO 6V
C X
10 μ F
SENSE
BAT
V BAT
V IN
C IN
HIGH
FREQUENCY
CIRCULATING
PATH
C OUT
BAT
Q1: Si4435DY
Q2: TP0610L
HIGH DUTY CYCLE
+
CONNECTION
Figure 11. Replacing the Input Diode
1571 F11
GND
LT1571-5
Figure 12. High Speed Switching Path
1571 F12
L1
D1
GND
SW
BOOST
BAT2
FLAG
SELECT
SENSE
GND
GND
V CC2
V CC1
CAP
PROG
V C
BAT
GND
C IN
1571 F13
Figure 13. Critical Electrical and Thermal Path Layer for LT1571-5
14
相关PDF资料 |
PDF描述 |
|---|---|
| 415-0009-030 | CABLE SMB-RA/SMB-RA 30" RG-179 |
| 63RX30330MG412.5X25 | CAP ALUM 330UF 63V 20% RADIAL |
| LT1571EGN-5#TR | IC CHARGER BATT CONST V/I 16SSOP |
| MAX824MEUK+T | IC SUPERVISOR MPU SOT23-5 |
| 415-0014-030 | CABLE MCX/MCX 30" RG-178 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
发布紧急采购，3分钟左右您将得到回复。