参数资料
| 型号： | LT3503EDCB#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1A 6DFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.78 V ~ 16.2 V |
| 输入电压： | 3.6 V ~ 20 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2.2MHz |
| 电流 - 输出： | 1A |
| 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： | 6-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 6-DFN-EP（2x3） |
LT3503
APPLICATIO S I FOR ATIO
D2
D2
BOOST
LT3503
C3
BOOST
LT3503
C3
V IN
V IN
SW
V OUT
V IN
V IN
SW
V OUT
GND
V BOOST – V SW ? V OUT
MAX V BOOST ? V IN + V OUT
(6a)
3503 F06a
GND
V BOOST – V SW ? V IN
MAX V BOOST ? 2V IN
(6b)
3503 F06b
Figure 6. Two Circuits for Generating the Boost Voltage
7.7
5.5
7.2
6.7
TO START
5.0
TO START
6.2
TO RUN
4.5
TO RUN
4.0
5.7
5.2
1
10 100
1000
3.5
1
10 1OO
1000
LOAD CURRENT (mA)
3503 F07a
(7a) Typical Minimum Input Voltage,
V OUT = 5V
Figure 7
LOAD CURRENT (mA)
3503 F07b
(7b) Typical Minimum Input Voltage,
V OUT = 3.3V
The minimum operating voltage of an LT3503 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 LT3503
is turned on with its SHDN pin when the output is already
in regulation, then the boost capacitor may not be fully
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 the 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 7 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 verly slowly.
For lower start-up voltage, the boost diode can be tied to
V IN ; however this restricts the input range to one-half of
the absolute maximum rating of the BOOST pin.
At light loads, the inductor current becomes discontinu-
ous and the effective duty cycle can be very high. This
reduces the minimum input voltage to approximately
400mV above V OUT . At higher load currents, the inductor
current is continuous and the duty cycle is limited by the
maximum duty cycle of the LT3503, requiring a higher
input voltage to maintain regulation.
3503f
13
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