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| 型号： | LT3980IDE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2A 14DFN |
| 标准包装： | 91 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.79 V ~ 52.2 V |
| 输入电压： | 3.6 V ~ 58 V |
| PWM 型： | 电流模式，Burst Mode? |
| 频率 - 开关： | 225kHz ~ 2.25MHz |
| 电流 - 输出： | 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： | 14-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 14-DFN-EP（4x3） |
LT3980
APPLICATIONS INFORMATION
use in switching regulators. The ESR should be specified
by the supplier, and should be 0.05Ω or less. Such a
capacitor will be larger than a ceramic capacitor and will
have a larger capacitance, because the capacitor must be
large to achieve low ESR. Table 2 lists several capacitor
vendors.
Table 2. Capacitor Vendors
VENDOR URL PART SERIES COMMANDS
Panasonic www.panasonic.com Ceramic, Polymer, EEF Series
Tantalum
Kemet www.kemet.com Ceramic, Tantalum T494, T495
Sanyo www.sanyovideo.com Ceramic, Polymer, POSCAP
Tantalum
Murata www.murata.com Ceramic SOT-23
AVX www.avxcorp.com Ceramic, Tantalum SOT-23
Taiyo Yuden www.taiyo-yuden.com Ceramic TPS Series
Catch Diode
The catch diode conducts current only during switch off
time. Average forward current in normal operation can
be calculated from:
I D(AVG) = I OUT (V IN – V OUT )/V IN
loads the LT3980 can excite the ceramic capacitor at
audio frequencies, generating audible noise. Since the
LT3980 operates at a lower current limit during Burst
Mode operation, the noise is nearly silent to a casual ear.
If this is unacceptable, use a high performance tantalum
or electrolytic capacitor at the output.
Frequency Compensation
The LT3980 uses current mode control to regulate the
output. This simplifies loop compensation. In particular,
the LT3980 does not require the ESR of the output capacitor
for stability, so you are free to use ceramic capacitors to
achieve low output ripple and small circuit size. Frequen-
cy compensation is provided by the components tied to
the V C pin, as shown in Figure 2. Generally a capacitor
(C C ) and a resistor (R C ) in series to ground are used. In
addition, there may be lower value capacitor in parallel.
This capacitor (C F ) is not part of the loop compensation
but is used to filter noise at the switching frequency, and
is required only if a phase-lead capacitor is used or if the
output capacitor has high ESR.
where I OUT is the output load current. The only reason to
consider a diode with a larger current rating than necessary
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 Schottky diode with a
reverse voltage rating greater than the input voltage. The
overvoltage protection feature in the LT3980 will keep the
switch off when V IN > 64V which allows the use of 64V
rated Schottky even when V IN ranges up to 80V.
Ceramic Capacitors
LT3980
CURRENT MODE
POWER STAGE
g m = 5.3mho
3M
V C
SW
ERROR
AMPLIFIER
FB
g m =
500μmho
0.79V
GND
R1
C PL
ESR
+
C1
POLYMER
OR
TANTALUM
OUTPUT
C1
CERAMIC
Ceramic capacitors are small, robust and have very low
ESR. However, ceramic capacitors can cause problems
when used with the LT3980 due to their piezoelectric nature.
When in Burst Mode operation, the LT3980’s switching
frequency depends on the load current, and at very light
C F
R C R2
C C
Figure 2. Model for Loop Response
3980 F02
3980fa
12
For more information www.linear.com/LT3980
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