参数资料
型号: LT3641EUFD#TRPBF
厂商: Linear Technology
文件页数: 16/28页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ DL 28QFN
标准包装: 2,500
类型: 降压(降压)
输出类型: 可调式
输出数: 2
输出电压: 可调至 1.265V,可调至 0.6V
输入电压: 2.5 V ~ 42 V
PWM 型: 电流模式,混合
频率 - 开关: 500kHz ~ 2MHz
电流 - 输出: 1.3A,1.1A
同步整流器: 两者兼有
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 28-WFQFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 28-QFN(4x5)
LT3641
APPLICATIONS INFORMATION
Table 4. Diode Vendors
capacitor charging scheme solves this start-up issue.
PART NUMBER
V R
(V)
I AVE
(A)
V F AT 1A
(MV)
V F AT 2A
(MV)
V F AT 3A
(MV)
Figure 2 shows that the minimum input voltage to start
the high voltage channel nonsynchronous buck regulator
On Semiconductor
of the LT3641 is very close to the minimum input voltage
MBRM120E
20
1
530
595
to regulate the output voltage for most of the load range.
MBRM140
Diodes Inc.
40
1
5
B120
20
1
500
START
B130
B220
B230
DFLS240L
30
20
30
40
1
2
2
2
500
500
500
500
650
4
3
RUN
DFLS260
60
2
620
PDS360
PDS3100
60
100
3
3
620
760
2
International Recti?er
1
10BQ030
30
1
420
470
20BQ030
30
2
470
0
BST and SW Pin Considerations
The high voltage channel requires an external capacitor
between the BST and SW pins and an external boost diode
from a voltage source to the BST pin. In most cases, a
0.001
5
0.01 0.1
V OUT CURRENT (A)
(2a) F S = 2MHz
1
3641 F03a
0.22μF capacitor will work well. Use a Schottky with fast
reverse recovery for BST diode. The (BST-SW) voltage
cannot exceed 5.5V, and must be more than 2.3V for best
ef?ciency. Connect the boost diode to any voltage between
2.7V and 5.5V. The V IN2 pin is the best choice if the low
voltage channel is used.
The high voltage channel will not start until the (BST-SW)
voltage is 2V or above. When the LT3641 is enabled, an
4
3
2
1
RUN
START
internal ~5mA current source from V IN ?ows out of the
BST pin. The SW pin is disconnected from the SW1 pin,
and is pulled down by an internal current source to ground.
0
0.001
0.01 0.1
V OUT CURRENT (A)
1
3641 F03b
The external boost capacitor can be charged up regard-
less of the output. When the (BST-SW) voltage reaches
2V, the SW pin is connected to the SW1 pin, and the high
voltage channel starts switching. However, the internal
(2b) F S = 500kHz
Figure 2. High Voltage Channel Minimum
Input Voltage for V OUT1 = 3.3V
bipolar power switch cannot be fully saturated until the
(BST-SW) voltage is further charged to above 2.3V. To start
up a traditional nonsynchronous buck regulator with very
light load, the input voltage needs to be a couple of volts
higher than the minimum running input voltage if the input
voltage is ramping up slowly. The LT3641’s unique boost
3641fa
16
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