参数资料
| 型号： | LT1913IDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3.5A 10DFN |
| 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： | 0.79 V ~ 25 V |
| 输入电压： | 3.6 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 2.4MHz |
| 电流 - 输出： | 3.5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-DFN（3x3） |
LT1913
APPLICATIONS INFORMATION
BD
V OUT
is more ef?cient because the BOOST pin current and BD
pin quiescent current comes from a lower voltage source.
V IN
4.7μF
V IN
BOOST
LT1913
SW
GND
C3
You must also be sure that the maximum voltage ratings
of the BOOST and BD pins are not exceeded.
The minimum operating voltage of an LT1913 application
is limited by the minimum input voltage (3.6V) and by the
maximum duty cycle as outlined in a previous section. For
(4a) For V OUT > 2.8V
proper startup, the minimum input voltage is also limited
by the boost circuit. If the input voltage is ramped slowly,
BD
BOOST
D2
V OUT
or the LT1913 is turned on with its RUN/SS pin when the
output is already in regulation, then the boost capacitor
may not be fully charged. Because the boost capacitor is
V IN
V IN
LT1913
C3
4.7μF
GND
SW
6.0
5.5
5.0
TO START
(WORST CASE)
(4b) For 2.5V < V OUT < 2.8V
4.5
4.0
V OUT
3.5
TO RUN
V IN
V IN
BD
BOOST
LT1913
C3
3.0
2.5
2.0
V OUT = 3.3V
T A = 25°C
L = 8.2μH
f = 600kHz
4.7μF
GND
SW
1
10
100 1000
LOAD CURRENT (mA)
10000
8.0
1913 FO4
(4c) For V OUT < 2.5V
Figure 4. Three Circuits For Generating The Boost Voltage
more than 2.3V above the SW pin for best ef?ciency. For
outputs of 3V and above, the standard circuit (Figure 4a)
7.0
6.0
5.0
4.0
TO START
(WORST CASE)
TO RUN
is best. For outputs between 2.8V and 3V, use a 1μF boost
capacitor. A 2.5V output presents a special case because it
is marginally adequate to support the boosted drive stage
while using the internal boost diode. For reliable BOOST pin
3.0
2.0
1
V OUT = 5V
T A = 25°C
L = 8.2μH
f = 600kHz
10
100 1000
LOAD CURRENT (mA)
10000
operation with 2.5V outputs use a good external Schottky
diode (such as the ON Semi MBR0540), and a 1μF boost
capacitor (see Figure 4b). For lower output voltages the
1913 F05
Figure 5. The Minimum Input Voltage Depends on
Output Voltage, Load Current and Boost Circuit
boost diode can be tied to the input (Figure 4c), or to
another supply greater than 2.8V. The circuit in Figure 4a
1913f
15
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