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| 型号： | LT1616ES6#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 3.3V/5V 0.6A SOT23-6 |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V，5V |
| 输入电压： | 3.6 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.4MHz |
| 电流 - 输出： | 600mA |
| 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： | SOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | SOT-23-6 |
LT1616
APPLICATIO S I FOR ATIO
BOOST Pin Considerations
Capacitor C3 and diode D2 are used to generate a boost
voltage that is higher than the input voltage. In most cases
a 0.01 μ F capacitor and fast switching diode (such as the
1N4148 or 1N914) will work well. Figure 5 shows two
ways to arrange the boost circuit. The BOOST pin must be
more than 2.5V above the SW pin for best efficiency. For
outputs of 3.3V and above, the standard circuit (Figure 5a)
is best. For outputs between 2.8V and 3.3V, use a 0.033 μ F
capacitor and a small Schottky diode (such as the
BAT-54). For lower output voltages the boost diode can be
tied to the input (Figure 5b). The circuit in Figure 5a is more
efficient because the BOOST pin current comes from a
charged. Because the boost capacitor is charged with the
energy stored in the inductor, the circuit will rely on some
minimum load current to get the boost circuit running
properly. This minimum load will depend on input and
output voltages, and on the arrangement of the boost
circuit. The minimum load generally goes to zero once the
circuit has started. Figure 6 shows a plot of minimum load
to start and to run as a function of input voltage. In many
cases the discharged output capacitor will present a load
to the switcher which will allow it to start. The plots show
the worst-case situation where V IN is ramping very slowly.
Use a Schottky diode (such as the BAT-54) for the lowest
start-up voltage.
D BOOST = BAT54
lower voltage source. You must also be sure that the
maximum voltage rating of the BOOST pin is not exceeded.
The minimum operating voltage of an LT1616 application
is limited by the undervoltage lockout (< 3.6V) and by the
maximum duty cycle as outlined above. For proper start-
up, the minimum input voltage is also limited by the boost
circuit. If the input voltage is ramped slowly, or the LT1616
is turned on with its SHDN pin when the output is already
7
6
5
Minimum Input Voltage V OUT = 3.3V
V OUT = 3.3V
BOOST DIODE
TIED TO OUTPUT
BOOST DIODE
TIED TO INPUT
V T O START
in regulation, then the boost capacitor may not be fully
D2
4
3
V TO RUN
BOOST
C3
1
10 100
LOAD CURRENT (mA)
500
V IN
V IN
LT1616
SW
V OUT
1616 F06a
D BOOST = BAT54
GND
V BOOST – V SW ? V OUT
MAX V BOOST ? V IN + V OUT
(5a)
D2
1616 F05a
9
8
7
Minimum Input Voltage V OUT = 5V
V OUT = 5V
BOOST DIODE
TIED TO OUTPUT
BOOST DIODE
TIED TO INPUT
V TO START
BOOST
LT1616
C3
6
V IN
V IN
SW
V OUT
5
V TO RUN
GND
V BOOST – V SW ? V IN
MAX V BOOST ? 2V IN
1616 F05b
4
1
10 100
LOAD CURRENT (mA)
500
(5b)
Figure 5. Two Circuits for Generating the Boost Voltage
1616 F06b
Figure 6. The Minimum Input Voltage Depends
on Output Voltage, Load Current and Boost Circuit
10
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