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| 型号： | LTC3413IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 16TSSOP |
| 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： | 0.7 V ~ 5.5 V |
| 输入电压： | 2.25 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-TSSOP-EP |
LTC3413
APPLICATIONS INFORMATION
The junction temperature, T J , is given by:
T J = T A + T R
where T A is the ambient temperature.
As an example, consider the LTC3413 in dropout at an
input voltage of 3.3V, a load current of 3A and an ambi-
ent temperature of 70°C. From the Typical Performance
graph of switch resistance, the R DS(ON) of the P-channel
switch at 70°C is approximately 97mΩ. Therefore, power
dissipated by the part is:
P D = (I LOAD2 )(R DS(ON) ) = (3A) 2 (97mΩ) = 0.87W
For the TSSOP package, the θ JA is 38°C/W. Thus the junc-
appear on V OUT . For example, a load step transient could
cause the input voltage to drop if there is insuf?cient bulk
capacitance at the V IN pin. The corresponding drop in the
output voltage during the load step transient is caused by
the V OUT tracking of V IN and should not be confused with
poor load regulation.
Design Example
As a design example, consider using the LTC3413 in an
application with the following speci?cations: V IN = 2.5V,
V OUT = 1.25V, I OUT(MAX) = ±3A, f = 1MHz.
First, calculate the timing resistor:
tion temperature of the regulator is:
T J = 70°C + (0.87W)(38°C/W) = 103°C
R OSC =
3 . 23 ? 10 11
1 ? 10 6
– 10 k Ω = 313 k Ω
L = ?
? ? ? ? 1 – 2 . 5 V ? ? = 0 . 4 7 μ H
? ? ? ? 1 – 2 . 5 V ? ? = 1 . 33 A
Δ I L = ?
I RMS = 3 A ?
– 1 = 1 . 5 A RMS
which is below the maximum junction temperature of
125°C.
Note that at higher supply voltages, the junction temperature
is lower due to reduced switch resistance (R DS(ON) ).
Checking Transient Response
The regulator loop response can be checked by looking
at the load transient response. Switching regulators take
several cycles to respond to a step in load current. When
a load step occurs, V OUT immediately shifts by an amount
equal to Δ I LOAD (ESR), where ESR is the effective series
resistance of C OUT . ΔI LOAD also begins to charge or dis-
charge C OUT generating a feedback error signal used by the
regulator to return V OUT to its steady-state value. During
this recovery time, V OUT can be monitored for overshoot
or ringing that would indicate a stability problem. The I TH
pin external components and output capacitor shown in
Figure 1a will provide adequate compensation for most
applications.
Output Voltage Tracking of V REF
For applications in which the V REF pin is connected to
the V IN pin, the output voltage will be equal to one-half
of the voltage on the V IN pin. Because the output voltage
Use a standard value of 309k. Next, calculate the inductor
value for about 40% ripple current:
? 1 . 25 V ? ? 1 . 25 V ?
? 1 MHz ? 1 . 2 A
Using a 0.47μH inductor results in a maximum ripple
current of:
? 1 . 25 V ? ? 1 . 25 V ?
? 1 MHz ? 0 . 47 μ H
C OUT will be selected based on the ESR that is required
to satisfy the output voltage ripple requirement and the
bulk capacitance needed for loop stability. For this design,
two 100μF ceramic capacitors will be used. C IN should be
sized for a maximum current rating of:
? 1 . 25 V ? 2 . 5 V
?
? 2 . 5 V ? 1 . 25 V
Decoupling the PV IN pins with two 100μF capacitors is
adequate for most applications. Connect the V REF pin
directly to SV IN . Connecting the V FB pin directly to V OUT
will set the output voltage equal to one-half of the volt-
age on the V REF pin. The complete circuit for this design
example is illustrated in Figure 3.
will track the input voltage, any disturbance on V IN will
3413fc
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| LTC3414 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:20V, 5A Synchronous Step-Down Regulator |
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| LTC3414EFE#PBF | 功能描述:IC REG BUCK SYNC ADJ 4A 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
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| LTC3414EFE#TRMPBF | 制造商:Linear Technology 功能描述:LEAD FREE 4MHz, 4A Synch Step dwn Regulator |
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