参数资料
| 型号： | LT3693IMSE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3.5A 10MSOP |
| 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 ~ 30 V |
| 输入电压： | 3.6 V ~ 36 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 2.45MHz |
| 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-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
LT3693
APPLICATIONS INFORMATION
BD
V OUT
is marginally adequate to support the boosted drive stage
while using the internal boost diode. For reliable BOOST pin
V IN
4.7 F
V IN
BOOST
LT3693
SW
GND
C3
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
boost diode can be tied to the input (Figure 4c), or to
another supply greater than 2.8V. Tying BD to V IN reduces
the maximum input voltage to 28V. The circuit in Figure 4a
(4a) For V OUT > 2.8V
V OUT
is more ef?cient because the BOOST pin current and BD
pin quiescent current comes from a lower voltage source.
You must also be sure that the maximum voltage ratings
BD
BOOST
D2
of the BOOST and BD pins are not exceeded.
V IN
V IN
LT3693
C3
4.7 F
GND
SW
6.0
5.5
TO START
(WORST CASE)
5.0
(4b) For 2.5V < V OUT < 2.8V
4.5
4.0
V OUT
3.5
TO RUN
V IN
V IN
BD
BOOST
LT3693
C3
3.0
2.5
2.0
V OUT = 3.3V
T A = 25 C
L = 8.2 H
f = 600kHz
4.7 F
GND
SW
1
10
100 1000
LOAD CURRENT (mA)
10000
8.0
3693 FO5
(4c) For V OUT < 2.5V; V IN(MAX) = 28V
7.0
TO START
(WORST CASE)
Figure 4. Three Circuits For Generating The Boost Voltage
6.0
BOOST and BIAS Pin Considerations
Capacitor C3 and the internal boost Schottky diode (see
5.0
4.0
TO RUN
V OUT = 5V
the Block Diagram) are used to generate a boost volt-
age that is higher than the input voltage. In most cases
a 0.47μF capacitor will work well. Figure 2 shows three
3.0
2.0
1
T A = 25 C
L = 8.2 H
f = 600kHz
10
100 1000
10000
ways to arrange the boost circuit. The BOOST pin must be
more than 2.3V above the SW pin for best ef?ciency. For
LOAD CURRENT (mA)
3693 F06
outputs of 3V and above, the standard circuit (Figure 4a)
is best. For outputs between 2.8V and 3V, use a 1μF boost
Figure 5. The Minimum Input Voltage Depends on
Output Voltage, Load Current and Boost Circuit
capacitor. A 2.5V output presents a special case because it
3693f
14
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