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参数资料
| 型号： | LTC3388IMSE-3#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 50MA 10MSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 2.8V，3V，3.3V，5V |
| 输入电压： | 2.7 V ~ 20 V |
| 电流 - 输出： | 50mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
LTC3388-1/LTC3388-3
APPLICATIONS INFORMATION
If transient load currents above 50mA are required then a
larger capacitor can be used at the output. This capacitor
will be continuously discharged during a load condition
and the capacitor can be sized for an acceptable drop in
current rating greater than 200mA. The DCR of the induc-
tor can have an impact on efficiency as it is a source of
loss. Trade-offs between price, size, and DCR should be
evaluated. Table 2 lists several inductors that work well
V OUT :
C OUT = ( V OUT + – V OUT –
)
I LOAD ? I BUCK
t LOAD
with the LTC3388-1/LTC3388-3.
Table 2. Recommended Inductors for LTC3388-1/LTC3388-3
MAX MAX
Here V OUT+ is the value of V OUT when PGOOD goes high
and V OUT– is the desired lower limit of V OUT . I BUCK is the
average current being delivered from the buck converter,
typically I PEAK /2.
A standard surface mount ceramic capacitor can be used
for C OUT , though some applications may be better suited
INDUCTOR TYPE
CDRH2D18/LDNP
A997AS-220M
LPS5030-223MLC
LPS4012-473MLC
SLF7045T
L
(μH)
22
22
22
47
100
I DC
(mA)
300
390
700
350
500
DCR
(Ω)
0.320
0.440
0.190
1.400
0.250
SIZE in mm
(L × W × H)
3.2 × 3.2 × 2.0
4.0 × 4.0 × 1.8
4.9 × 4.9 × 3.0
4.0 × 4.0 × 1.2
7.0 × 7.0 × 4.5
MANU-
FACTURER
Sumida
Toko
Coilcraft
Coilcraft
TDK
to a low leakage aluminum electrolytic capacitor or a
supercapacitor. These capacitors can be obtained from
manufacturers such as Vishay, Illinois Capacitor, AVX,
or CAP-XX.
Inductor
The buck is optimized to work with an inductor of at least
22μH. This value represents a suitable trade-off between
size and efficiency for typical applications. A larger induc-
tor will benefit high voltage applications by increasing the
on-time of the PMOS switch and improving efficiency by
reducing gate charge loss. Choose an inductor with a DC
V IN2 and CAP Capacitors
A 1μF capacitor should be connected between V IN and
CAP and a 4.7μF capacitor should be connected between
V IN2 and GND. These capacitors hold up the internal rails
during buck switching and compensate the internal rail
generation circuits. In applications where the input source
is limited to less than 6V, the CAP pin can be tied to GND
and the V IN2 pin can be tied to V IN as shown in Figure 6.
This circuit does not require the capacitors on V IN2 and
CAP, saving components and allowing a lower voltage
rating for the single V IN capacitor.
EN
STBY
EN
STBY
LTC3388-1
2.7V TO 5.5V
V IN
PGOOD
PGOOD
2.2μF
6V
V IN2
CAP
D1
D0
GND
SW
V OUT
22μH
V OUT
1.2V
10μF
6V
338813 F06
Figure 6. Smallest Solution Size 1.2V
Low Input Voltage Power Supply
338813f
15
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