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LT1512CS8#TR PDF预览

LT1512CS8#TR

更新时间： 2024-01-26 18:50:44
品牌 Logo 应用领域
凌特 - Linear 电池光电二极管
页数 文件大小 规格书
12页 226K
描述
LT1512 - SEPIC Constant-Current/Constant-Voltage Battery Charger; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C

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LT1512CS8#TR 技术参数

是否Rohs认证： 不符合生命周期：Active
包装说明：SOP,Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.26模拟集成电路 - 其他类型：BATTERY CHARGE CONTROLLER
控制模式：CURRENT-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：25 V最小输入电压：2.7 V
标称输入电压：5 VJESD-30 代码：R-PDSO-G8
JESD-609代码：e0长度：4.9025 mm
湿度敏感等级：1功能数量：1
端子数量：8最高工作温度：70 °C
最低工作温度：最大输出电流：2.7 A
标称输出电压：1.245 V封装主体材料：PLASTIC/EPOXY
封装代码：SOP封装形状：RECTANGULAR
封装形式：SMALL OUTLINE峰值回流温度（摄氏度）：235
认证状态：Not Qualified座面最大高度：1.752 mm
最大供电电流 (Isup)：5.5 mA表面贴装：YES
切换器配置：SINGLE最大切换频率：580 kHz
技术：BIPOLAR温度等级：COMMERCIAL
端子面层：Tin/Lead (Sn/Pb)端子形式：GULL WING
端子节距：1.27 mm端子位置：DUAL
处于峰值回流温度下的最长时间：20宽度：3.9 mm

LT1512CS8#TR 数据手册

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LT1512  
U
OPERATION  
current amplifier is set to a fixed gain of –12.5 which  
voltage between 1V (low output current) and 1.9V (high  
outputcurrent). SwitchdutycyclegoestozeroiftheVC pin  
is pulled below the VC pin threshold, placing the LT1512 in  
an idle mode.  
provides a –100mV current limit sense voltage.  
The error signal developed at the amplifier output is  
brought out externally and is used for frequency compen-  
sation. During normal regulator operation this pin sits at a  
U
W U U  
APPLICATIONS INFORMATION  
tionaluncorrectableerrortotheconstantvoltagefloatmode  
The LT1512 is an IC battery charger chip specifically opti-  
mized to use the SEPIC converter topology. The SEPIC  
topology has unique advantages for battery charging. It will  
operate with input voltages above, equal to or below the  
battery voltage, has no path for battery discharge when  
turned off and eliminates the snubber losses of flyback  
designs. It also has a current sense point that is ground  
referred and need not be connected directly to the battery.  
The two inductors shown are actually just two identical  
windings on one inductor core, although two separate  
inductors can be used.  
of about ±0.5% as calculated by:  
±0.15µA(R1)(R2)  
1.245(R1+R2)  
V
Error =  
BAT  
±0.15µA = expected variation in FB bias current around  
the nominal 0.3µA typical value.  
With R2 = 41.2k and R1 = 228k, (VBAT = 8.2V), the error due  
to variations in bias current would be ±0.42%.  
A second option is to disconnect the voltage divider with a  
small NMOS transistor as shown in Figure 3. To ensure  
adequatedrivetothetransistor(evenwhentheVIN voltageis  
at its lowest operating point of 2.4V), the FET gate is driven  
wth a peak detected voltage via D2. Note that there are two  
connectionsforD2. TheL1Aconnectionmustbeusedifthe  
voltage divider is set for less than 3.5V (fully charged  
battery). Gate drive is equal to battery voltage plus input  
voltage. The disadvantage of this connection is that Q1 will  
stillbe“on”iftheVIN voltageisactiveandthechargerisshut  
down via the S/S pin. The L1 B connection allows Q1 to turn  
off when VIN is off or when shutdown is initiated, but the  
reduced gate drive (=VBAT) is not adequate to ensure a Q1  
on-stateforfullychargedbatteryvoltageslessthan3.5V.Do  
not substitute for Q1 unless the new device has adequate  
VGS maximum rating, especially if D2 is connected to L1A.  
C6 filters the gate drive and R5 pulls the gate low when  
switching stops.  
A current sense voltage is generated with respect to ground  
across R3 in Figure 1. The average current through R3 is  
always identical to the current delivered to the battery. The  
LT1512currentlimitloopwillservothevoltageacrossR3to  
–100mV when the battery voltage is below the voltage limit  
set by the output divider R1/R2. Constant current charging  
is therefore set at 100mV/R3. R4 and C4 filter the current  
signaltodeliverasmoothfeedbackvoltagetotheIFB pin. R1  
andR2formadividerforbatteryvoltagesensingandsetthe  
batteryfloatvoltage.ThesuggestedvalueforR2is12.4k.R1  
is calculated from:  
R2(V  
1.245 +R2(0.3µA)  
– 1.245)  
BAT  
R1=  
VBAT = battery float voltage  
0.3µA = typical FB pin bias current  
A value of 12.4k for R2 sets divider current at 100µA. This is  
a constant drain on the battery when power to the charger is  
off. If this drain is too high, R2 can be increased to 41.2k,  
reducing divider current to 30µA. This introduces an addi-  
Disconnecting the divider leaves only D1 diode leakage as a  
battery drain. See Diode Selection for a discussion of diode  
leakage.  
6
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