参数资料
| 型号： | LT3489EMS8E#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 2.5A 8MSOP |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.6 V ~ 40 V |
| 输入电压： | 2.6 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2MHz |
| 电流 - 输出： | 2.5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-MSOP-EP |
LT3489
OPERATIO
The LT3489 uses a constant frequency, current mode con-
trol scheme to provide excellent line and load regulation.
Please refer to Figure 1 for the following description of the
part’s operation. At the start of the oscillator cycle, the SR
latch is set, turning on the power switch, Q1. The switch
current ?ows through the internal current sense resistor
generating a voltage. This voltage is added to a stabilizing
ramp and the resulting sum is fed into the positive terminal
of the PWM comparator, A2. When this voltage exceeds
the level at the negative input of A2, the SR latch is reset,
turning off the power switch. The level at the negative
input of A2 (V C pin) is set by the error ampli?er (g m ) and
is simply an ampli?ed version of the difference between
the feedback voltage and the reference voltage of 1.235V.
A soft-start function is provided to enable a clean start-up
for the LT3489. When the part is brought out of shut-
down, 10μA of current is sourced out of the SS pin. By
connecting an external capacitor to the SS pin, the rate
of voltage rise on the pin can be set. Typical values for
the soft-start capacitor range from 10nF to 200nF. The SS
pin indirectly limits the rate of rise on the V C pin, which
in turn limits the peak switch current. Current limit is
not shown in Figure 1. The switch current is constantly
monitored and not allowed to exceed the nominal value
of 2.5A. If the switch current reaches 2.5A, the SR latch
is reset regardless of the output of comparator A2. This
current limit helps protect the power switch as well as the
external components connected to the LT3489.
In this manner, the error ampli?er sets the correct peak
current level to keep the output in regulation.
3489f
5
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