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参数资料
| 型号： | LT3480EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2A 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 ~ 20 V |
| 输入电压： | 3.6 V ~ 36 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 200kHz ~ 2.4MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°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） |
LT3480
APPLICATIONS INFORMATION
C OUT =
energyinordertosatisfytransientloadsandstabilizethe
LT3480’s control loop. Ceramic capacitors have very low
equivalent series resistance (ESR) and provide the best
ripple performance. A good starting value is:
100
V OUT f SW
where f SW is in MHz, and C OUT is the recommended output
capacitance in μF. Use X5R or X7R types. This choice will
provide low output ripple and good transient response.
Transient performance can be improved with a higher value
capacitor if the compensation network is also adjusted
to maintain the loop bandwidth. A lower value of output
capacitor can be used to save space and cost but transient
performance will suffer. See the Frequency Compensation
section to choose an appropriate compensation network.
When choosing a capacitor, look carefully through the
data sheet to find out what the actual capacitance is under
operating conditions (applied voltage and temperature).
A physically larger capacitor, or one with a higher voltage
rating, may be required. High performance tantalum or
electrolytic capacitors can be used for the output capacitor.
Low ESR is important, so choose one that is intended for
use in switching regulators. The ESR should be specified
by the supplier, and should be 0.05 or less. Such a capaci-
tor 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. Capacito r Vendors
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
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 LT3480 will keep the
switch off when V IN > 38V which allows the use of 40V
rated Schottky even when V IN ranges up to 60V. Table 3
lists several Schottky diodes and their manufacturers.
Table 3. Diode Vendors
V R I AVE V F AT 1A V F AT 2A
PART NUMBER (V) (A) (mV) (mV)
On Semiconductor
MBRM120E 20 1 530 595
MBRM140 40 1 550
Diodes Inc.
B120 20 1 500
B130 30 1 500
B220 20 2 500
B230 30 2 500
DFLS240L 40 2 500
International Rectifier
10BQ030 30 1 420 470
20BQ030 30 2 470
VENDOR
Panasonic
Kemet
Sanyo
Murata
AVX
Taiyo Yuden
PHONE
(714) 373-7366
(864) 963-6300
(408) 749-9714
(408) 436-1300
(864) 963-6300
URL
www.panasonic.com
www.kemet.com
www.sanyovideo.com
www.murata.com
www.avxcorp.com
www.taiyo-yuden.com
PART SERIES
Ceramic,
Polymer,
Tantalum
Ceramic,
Tantalum
Ceramic,
Polymer,
Tantalum
Ceramic
Ceramic,
Tantalum
Ceramic
COMMANDS
EEF Series
T494, T495
POSCAP
TPS Series
3480fe
12
For more information www.linear.com/LT3480
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