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| 型号： | LT1512CS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/12页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHRGR CONST I/V 8-SOIC |
| 标准包装： | 100 |
| 功能： | 充电管理 |
| 电池化学： | 所有电池类型 |
| 电源电压： | 2.7 V ~ 25 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 产品目录页面： | 1340 (CN2011-ZH PDF) |
LT1512
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Saturation Voltage
vs Switch Current
Switch Current Limit
vs Duty Cycle
Minimum Input Voltage
vs Temperature
1.0
0.9
0.8
0.7
150°C
100°C
2 5° C
3.0
2.5
2.0
25°C AND
125°C
3.0
2.8
2.6
0.6
–55°C
0.5
0.4
0.3
0.2
0.1
–55°C
1.5
1.0
0.5
2.4
2.2
2.0
0
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
0
0
10 20 30 40 50 60 70 80 90 100
1.8
–50 –25
0
25
50
75
100 125 150
SWITCH CURRENT (A)
1512 G01
Minimum Peak-to-Peak
Synchronization Voltage vs Temp
DUTY CYCLE (%)
Feedback Input Current
vs Temperature
1512 G02
TEMPERATURE (°C)
1512 G03
Negative Feedback Input Current
vs Temperature
3.0
2.5
f SYNC = 700kHz
800
700
V FB = V REF
0
–10
600
2.0
1.5
1.0
0.5
500
400
300
200
100
–20
–30
–40
0
–50 –25
0
25
50
75
100 125 150
0
–50 –25
0
25
50
75
100 125 150
–50
–50 –25
0
25
50
75
100 125 150
TEMPERATURE (°C)
PIN FUNCTIONS
1512 G04
TEMPERATURE (°C)
1512 G05
TEMPERATURE (°C)
1512 G06
V C : The compensation pin is primarily used for frequency
compensation, but it can also be used for soft starting and
current limiting. It is the output of the error ampli?er and
the input of the current comparator. Peak switch current
increases from 0A to 1.8A as the V C voltage varies from
1V to 1.9V. Current out of the V C pin is about 200μA when
the pin is externally clamped below the internal 1.9V clamp
level. Loop frequency compensation is performed with a
capacitor or series RC network from the V C pin directly to
the ground pin (avoid ground loops).
FB: The feedback pin is used for positive output voltage
sensing. This pin is the inverting input to the voltage
error ampli?er. The R1/R2 voltage divider connected to
FB de?nes Li-Ion ?oat voltage at full charge, or acts as a
voltage limiter for NiCd or NiMH applications. Input bias
current is typically 300nA, so divider current is normally
set to 100μA to swamp out any output voltage errors due
to bias current. The noninverting input of this ampli?er is
tied internally to a 1.245V reference. The grounded end of
the output voltage divider should be connected directly to
the LT1512 ground pin (avoid ground loops).
1512fa
4
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