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| 型号： | LT3971IDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.2A 10DFN |
| 标准包装： | 121 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.19 V ~ 30 V |
| 输入电压： | 4.3 V ~ 38 V |
| PWM 型： | 电流模式，Burst Mode? |
| 频率 - 开关： | 200kHz ~ 2MHz |
| 电流 - 输出： | 1.2A |
| 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： | 管件 |
| 供应商设备封装： | 10-DFN（3x3） |
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LT3971/LT3971-3.3/LT3971-5
APPLICATIONS INFORMATION
for nominal operation is for the worst-case condition of
shorted output. The diode current will then increase to the
typical peak switch current. Peak reverse voltage is equal
to the regulator input voltage. Use a diode with a reverse
voltage rating greater than the input voltage.
Table 4. Schottky Diodes. The Reverse Current Values Listed Are
Estimates Based Off of Typical Curves for Reverse Current
vs Reverse Voltage at 25°C.
I R at V R =
V R I AVE V F at 1A V F at 2A 20V 25°C
PART NUMBER (V) (A) (mV) (mV) (μA)
On Semiconductor
MBR0520L 20 0.5 30
MBR0540 40 0.5 620 0.4
MBRM120E 20 1 530 595 0.5
An additional consideration is reverse leakage current.
When the catch diode is reversed biased, any leakage
current will appear as load current. When operating under
light load conditions, the low supply current consumed
by the LT3971 will be optimized by using a catch diode
with minimum reverse leakage current. Low leakage
Schottky diodes often have larger forward voltage drops
at a given current, so a trade-off can exist between low
load and high load efficiency. Often Schottky diodes with
larger reverse bias ratings will have less leakage at a given
output voltage than a diode with a smaller reverse bias
rating. Therefore, superior leakage performance can be
achieved at the expense of diode size. Table 4 lists several
Schottky diodes and their manufacturers.
MBRM140 40
Diodes Inc.
B0530W 30
B0540W 40
B120 20
B130 30
B140 40
B150 50
B220 20
B230 30
B140HB 40
DFLS240L 40
DFLS140 40
DFLS160 60
DFLS2100 100
B240 40
Central Semiconductor
CMSH1 - 40M 40
CMSH1 - 60M 60
CMSH1 - 40ML 40
CMSH2 - 40M 40
CMSH2 - 60M
60
CMSH2 - 40L
40
CMSH2 - 40
40
CMSH2 - 60M
60
1
0.5
0.5
1
1
1
1
2
2
1
2
1.1
1
2
2
1
1
1
2
2
2
2
2
550
620
500
500
500
700
510
500
770
500
700
400
500
500
500
860
500
550
700
400
500
700
20
15
1
1.1
1.1
1.1
0.4
20
0.6
1
4
1
2.5
0.01
0.45
Ceramic Capacitors
Ceramic capacitors are small, robust and have very low
ESR. However, ceramic capacitors can cause problems
when used with the LT3971 due to their piezoelectric nature.
When in Burst Mode operation, the LT3971’s switching
frequency depends on the load current, and at very light
loads the LT3971 can excite the ceramic capacitor at audio
frequencies, generating audible noise. Since the LT3971
operates at a lower current limit during Burst Mode op-
eration, the noise is typically very quiet to a casual ear. If
this is unacceptable, use a high performance tantalum or
electrolytic capacitor at the output.
A final precaution regarding ceramic capacitors concerns
the maximum input voltage rating of the LT3971. As pre-
viously mentioned, a ceramic input capacitor combined
with trace or cable inductance forms a high quality (under
damped) tank circuit. If the LT3971 circuit is plugged into a
live supply, the input voltage can ring to twice its nominal
value, possibly exceeding the LT3971’s rating. This situation
is easily avoided (see the Hot Plugging Safely section).
BOOST and BD Pin Considerations
Capacitor C3 and the internal boost Schottky diode (see
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 3 shows three
ways to arrange the boost circuit. The BOOST pin must
be more than 2.3V above the SW pin for best efficiency.
3971fd
15
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